Name: synthesis of platinum-nickel nanowires and optimization for oxygen reduction performance
Uploaded: 2018-04-27T12:30:00
Description: Watch this Scientific Journal Video about Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance at JoVE.com

根据合同号 DE-AC36-08GO28308 到 NREL, 美国能源部、能源效率和可再生能源办公室提供了财政支助。

1. 铂镍纳米线的合成
<ol><li>要开始置换过程, 在水中悬浮镍纳米线模板并将其加热到90摄氏度。<ol>
<li>在50毫升离心管中加入40毫克的商用, 镍纳米线到20毫升的去离子水。油脂实验5分钟。 注: 纳米线直径约为150-250 纳米, 长度为100-200 µm。</li>
		<li>将悬浮纳米线转移到250毫升的玻璃圆底烧瓶中, 加入60毫升的去离子水。在矿物油浴中加热烧瓶到90°c。搅拌反应混合物在 500 rpm 与聚四氟乙烯桨连接到?...

<ol>
	<li>Bregoli, L. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Influence+of+Platinum+Crystallite+Size+on+Electrochemical+Reduction+of+Oxygen+in+Phosphoric-Acid.">Influence of Platinum Crystallite Size on Electrochemical Reduction of Oxygen in Phosphoric-Acid.</a> Electrochim. Acta. 23 (6), 489-492 (1978).</li><li>Debe, M. K., Parsonage, E. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nanostructured+electrode+membranes.">Nanostructured electrode membranes.</a> US patent. , (1994).</li><li>Papandrew, A. B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Oxygen+Reduction+Activity+of+Vapor-Grown+Platinum+Nanotubes.">Oxygen Reduction Activity of Vapor-Grown Platinum Nanotubes.</a> ECS Trans. 50 (2), 1397-1403 (2013).</li><li>Alia, S. M., Yan, Y. S., Pivovar, B. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Galvanic+displacement+as+a+route+to+highly+active+and+durable+extended+surface+electrocatalysts.">Galvanic displacement as a route to highly active and durable extended surface electrocatalysts.</a> Cat. Sci. Tech. 4 (10), 3589-3600 (2014).</li><li>Alia, S. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platinum-Coated+Nickel+Nanowires+as+Oxygen-Reducing+Electrocatalysts.">Platinum-Coated Nickel Nanowires as Oxygen-Reducing Electrocatalysts.</a> ACS Cat. 4 (4), 1114-1119 (2014).</li><li>Alia, S. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Exceptional+Oxygen+Reduction+Reaction+Activity+and+Durability+of+Platinum-Nickel+Nanowires+through+Synthesis+and+Post-Treatment+Optimization.">Exceptional Oxygen Reduction Reaction Activity and Durability of Platinum-Nickel Nanowires through Synthesis and Post-Treatment Optimization.</a> ACS Omega. 2 (4), 1408-1418 (2017).</li><li>Norskov, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Origin+of+the+Overpotential+for+Oxygen+Reduction+at+a+Fuel-Cell+Cathode.">Origin of the Overpotential for Oxygen Reduction at a Fuel-Cell Cathode.</a> J. Phys. Chem. B. 108 (46), 17886-17892 (2004).</li><li>Sha, Y., Yu, T. H., Merinov, B. V., Shirvanian, P., Goddard, W. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mechanism+for+Oxygen+Reduction+Reaction+on+Pt3Ni+Alloy+Fuel+Cell+Cathode.">Mechanism for Oxygen Reduction Reaction on Pt3Ni Alloy Fuel Cell Cathode.</a> J. Phys. Chem. C. 116 (40), 21334-21342 (2012).</li><li>Paulus, U. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Oxygen+reduction+on+high+surface+area+Pt-based+alloy+catalysts+in+comparison+to+well+defined+smooth+bulk+alloy+electrodes.">Oxygen reduction on high surface area Pt-based alloy catalysts in comparison to well defined smooth bulk alloy electrodes.</a> Electrochim. Acta. 47 (22-23), 3787-3798 (2002).</li><li>Stamenkovic, V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Changing+the+activity+of+electrocatalysts+for+oxygen+reduction+by+tuning+the+surface+electronic+structure.">Changing the activity of electrocatalysts for oxygen reduction by tuning the surface electronic structure.</a> Angew. Chem. 118 (18), 2963-2967 (2006).</li><li>Cui, C., Gan, L., Heggen, M., Rudi, S., Strasser, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Compositional+segregation+in+shaped+Pt+alloy+nanoparticles+and+their+structural+behaviour+during+electrocatalysis.">Compositional segregation in shaped Pt alloy nanoparticles and their structural behaviour during electrocatalysis.</a> Nat Mater. 12 (8), 765-771 (2013).</li><li>Chen, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Highly+Crystalline+Multimetallic+Nanoframes+with+Three-Dimensional+Electrocatalytic+Surfaces.">Highly Crystalline Multimetallic Nanoframes with Three-Dimensional Electrocatalytic Surfaces.</a> Science. 343 (6177), 1339-1343 (2014).</li><li>Alia, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Porous+Platinum+Nanotubes+for+Oxygen+Reduction+and+Methanol+Oxidation+Reactions.">Porous Platinum Nanotubes for Oxygen Reduction and Methanol Oxidation Reactions.</a> Adv. Funct. Mater. 20 (21), 3742-3746 (2010).</li><li>Alia, S. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platinum+Coated+Copper+Nanowires+and+Platinum+Nanotubes+as+Oxygen+Reduction+Electrocatalysts.">Platinum Coated Copper Nanowires and Platinum Nanotubes as Oxygen Reduction Electrocatalysts.</a> ACS Cat. 3 (3), 358-362 (2013).</li><li>Alia, S. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platinum-Coated+Cobalt+Nanowires+as+Oxygen+Reduction+Reaction+Electrocatalysts.">Platinum-Coated Cobalt Nanowires as Oxygen Reduction Reaction Electrocatalysts.</a> ACS Cat. 4 (8), 2680-2686 (2014).</li><li>Alia, S. M., Duong, K., Liu, T., Jensen, K., Yan, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Palladium+and+Gold+Nanotubes+as+Oxygen+Reduction+Reaction+and+Alcohol+Oxidation+Reaction+Catalysts+in+Base.">Palladium and Gold Nanotubes as Oxygen Reduction Reaction and Alcohol Oxidation Reaction Catalysts in Base.</a> ChemSusChem. , (2014).</li><li>Alia, S. M., Pylypenko, S., Neyerlin, K. C., Kocha, S. S., Pivovar, B. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platinum+Nickel+Nanowires+as+Methanol+Oxidation+Electrocatalysts.">Platinum Nickel Nanowires as Methanol Oxidation Electrocatalysts.</a> J. Electrochem. Soc. 162 (12), 1299-1304 (2015).</li><li>Alia, S. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Oxidation+of+Platinum+Nickel+Nanowires+to+Improve+Durability+of+Oxygen-Reducing+Electrocatalysts.">Oxidation of Platinum Nickel Nanowires to Improve Durability of Oxygen-Reducing Electrocatalysts.</a> J. Electrochem. Soc. 163 (3), 296-301 (2016).</li></ol>

这些协议已经用于产生扩展表面催化剂与高表面区域和具体活动在氧气减少反应8。通过将 Pt 沉积在纳米结构模板上, 纳米线避免了低协调的场地, 减少了颗粒尺寸效应, 产生了比碳支持的铂纳米粒子高12倍以上的特定活动。利用电偶位移作为合成方法, 在 Ni 模板7上也产生了近似涂层。在 Pt 位移较低的情况下, 该工艺产生的电化学表面面积超过90米2 gPt...

质子交换膜燃料电池部分受催化剂层所需铂量和成本的限制, 燃料电池成本的一半可能是1。在燃料电池中, 纳米材料通常被开发成氧还原催化剂, 因为反应比氢氧化动力学慢。碳支持铂纳米粒子由于其高的表面面积, 常被用作氧还原催化剂;然而, 它们有特定的选择性活动, 容易产生耐久性损失。
扩展薄膜通过解决这些限制, 为纳米粒子提供了潜在的好处。延长 Pt 表面通常会产生比纳米粒子大得多的特定活动, 通过限制不太活跃的小平面和粒度效应, 并且在可能的循环2、3下显示为持久性。,4. 虽然在扩展表面催化剂中实现了高质量活动, 但主要是通过增加特定活动, 而催化剂类型仅限于 Pt, 低表面积 (10 米2 gPt-1)3,4,5。
自发电偶位移结合腐蚀和电泳的方面6。该工艺一般受两种金属的标准氧化还原电位的控制, 当金属阳离子比模板更具反应性时, 沉积通常发生。位移倾向于产生与模板形态相匹配的纳米结构。将该技术应用于扩展纳米结构, 可以形成铂基催化剂, 利用扩展薄膜的高比氧还原活性。通过部分位移, 少量 Pt 已沉积, 并已产生高表面积的材料 (> 90 米2 gPt-1)7,8。
这些协议涉及氢退火, 以混合 Pt 和镍区和改善氧还原活动。一些研究已经在理论上建立了这种机制, 并在实验中证实了铂氧还原过程中的合金化效应。将 pt OH 和铂 O 结合到氧还原活动的建模和关联表明 pt 改进可以通过格子压缩9,10进行。合金 pt 与较小的过渡金属已经证实了这一好处, 铂镍已被调查的一些形式, 包括多晶硅, 多面电极, 纳米粒子和纳米结构11,12, 13,14。
电偶位移已用于铂氧还原催化剂的开发与各种其他模板, 包括银, 铜, 钴纳米结构15,16,17。该合成技术还用于其他金属的沉积, 并为燃料电池、电解槽和醇类的电化学氧化制备了催化剂18,19,20, 21。类似的协议也可用于合成纳米材料, 具有更广泛的电化学应用。

<table border="0" cellpadding="0" cellspacing="0" style="width:681px;" width="680">
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	<tbody>
		<tr height="40">
			<td height="40" style="height:40px;width:215px;">Nickel nanowires</td>
			<td style="width:300px;">Plasmachem GmbH</td>
			<td style="width:167px;"></td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">250 mL round bottom flask</td>
			<td>Ace Glass</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Hot plate</td>
			<td>VWR International</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Mineral oil</td>
			<td>VWR International</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Potassium tetrachloroplatinate</td>
			<td>Sigma Aldrich</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Syringe pump</td>
			<td>New Era Pump Systems</td>
			<td></td>
			<td></td>
		</tr>
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			<td height="40" style="height:40px;">Rotator</td>
			<td>Arrow Engineering</td>
			<td></td>
			<td></td>
		</tr>
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			<td height="40" style="height:40px;">Teflon paddle</td>
			<td>Ace Glass</td>
			<td></td>
			<td></td>
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			<td height="40" style="height:40px;">Glass shaft</td>
			<td>Ace Glass</td>
			<td></td>
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		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Split hinge tubular furnace</td>
			<td>Lindberg</td>
			<td></td>
			<td>Customized in-house</td>
		</tr>
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			<td height="40" style="height:40px;">Schlenk line</td>
			<td>Ace Glass</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Condensers</td>
			<td>VWR International</td>
			<td></td>
			<td></td>
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			<td height="40" style="height:40px;">Nitric acid</td>
			<td>Fisher Scientific</td>
			<td></td>
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			<td height="40" style="height:40px;">2-propanol</td>
			<td>Fisher Scientific</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Nafion ionomer (5 wt. %)</td>
			<td>Sigma Aldrich</td>
			<td></td>
			<td></td>
		</tr>
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			<td height="40" style="height:40px;">Glassy carbon working electrode</td>
			<td>Pine Instrument Company</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">RDE glassware</td>
			<td>Precision Glassblowing</td>
			<td></td>
			<td>Customized in-house</td>
		</tr>
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			<td height="40" style="height:40px;">Platinum wire</td>
			<td>Alfa Aesar</td>
			<td></td>
			<td>Customized in-house</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Platinum mesh</td>
			<td>Alfa Aesar</td>
			<td></td>
			<td>Customized in-house</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">MSR Rotator</td>
			<td>Pine Instrument Company</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Potentiostat</td>
			<td>Metrohm Autolab</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

synthesis of platinum-nickel nanowires and optimization for oxygen reduction performance

以铂镍 (Pt 镍) 纳米线为燃料电池催化剂, 对氧还原反应的性能和耐久性进行了优化设计。利用自发电偶位移将 Pt 层沉积在镍纳米线基体上。合成方法生产的催化剂具有高特异活性和高 Pt 表面积。氢退火改善了 Pt 和镍的混合和特定的活性。采用酸浸法优先去除纳米线表面附近的镍, 采用氧退火法稳定近表面镍, 提高耐久性, 减少镍的溶解。这些协议详细的优化每个后合成处理步骤, 包括氢退火到250°c, 暴露到0.1 米硝酸, 氧退火到175摄氏度。通过这些步骤, 铂镍纳米线产生的活动比铂纳米粒子的数量级更高, 同时提供了显著的耐久性改进。所提出的协议是基于 Pt 镍系统在燃料电池催化剂的发展。这些技术也被用于各种金属组合, 并可用于发展多种电化学过程的催化剂。

镍纳米线的自发电偶位移与 pt, 使用指定的量, 产生了 pt 镍纳米线的 7.3 .% pt (图 1和图 2A)。为了达到最佳的 pt 负载, 可能需要对 pt 前驱体的数量进行一些修改。Pt 位移对表面 Ni 氧化物层的厚度敏感, 根据模板年龄 (空气暴露) 和上游可变性22的不同可能会有所不同。然而, 该组合物对于确保高活性和...

Watch this Scientific Journal Video about Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance at JoVE.com

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

铂镍纳米线的合成及减氧性能优化

该协议描述了铂镍纳米线的合成和电化学测试。用镍纳米线模板的电偶位移合成了纳米丝。采用氢退火、酸浸、氧退火等合成工艺, 优化了氧还原反应中纳米线的性能和耐久性。

Platinum-nickel (Pt-Ni) nanowires were developed as fuel cell electrocatalysts, and were optimized for the performance and durability in the oxygen ...

The overall goal of this procedure is to produce platinum based, extended surface electro-catalysts, that demonstrate a high level of performance and durability in the oxygen reduction reaction. This method could help address key issues in hydrogen fuel cells by reducing the amount of platinum required, and cutting the cost of the catalyst layer. The main advantage of this technique is that produces materials with high electrochemical surface areas, attritional limitation of surface catalysts.Begin the nanowire synthesis steps with the displacement process. In a 50 milliliter centrifuge tube, add 20 milliliters deionized water, and 40 milliliters nickel nanowires. Place the mixture in a sonicator and sonicate for five minutes.Meanwhile, prepare a mineral oil bath and an electric stirrer. Retrieve the suspended nanowires from the sonicator, and transfer them to a glass, 250 milliliter round-bottom flask. Add to the flask, 60 milliliters of deionized water.Then place it in the mineral bath to be heated to 90 degrees Celsius, and simultaneously stirred at 500 RPM. Equip the stirrer with a PTFE paddle on a glass shaft. Now form the platinum nickel nanowires.Have ready an automated syringe pump, and prepare a syringe. Use a 20 milliliter syringe with about 8 centimeters of tubing on its tip. Next, obtain 15 milliliters of deionized water, and add 8.1 milligrams of potassium tetrachloroplatinate.Transfer the solution to the syringe. Then place the syringe on the syringe pump. Arrange for the pump to add the solution to the flask containing nanowires.Set the rate to one milliliter per minute, and start the pump. Once the transfer is complete, continue stirring and heating the flask at 90 degrees Celsius for two hours. After two hours, put the solution in to a centrifuge tube, and centrifuge at 2500 G, for 15 minutes.Centrifugation gives rise to supernatant in the tube. Pour this off in to a waste container. With the supernatant gone, add fresh deionized water to the solids.Sonicate the mixture for about 10 seconds. Repeat the centrifuge, supernatant removal, and re-suspension steps, 3 times with the water, and a fourth with 2-Proponal. In the end, put the nanowires in a 20 milliliter, glass scintillation vial.Take the nanowires to a vacuum oven to dry at 40 degrees Celsius, overnight. First prepare, in a 20 milliliter scintillation vial, what is called the Ink. This is deionized water, a catalyst with 73 micrograms of platinum, and 2-propanol.Ice the vial for five minutes. After five minutes, add 10 microliters of ionomer to the ink. Return the vial to the container of ice, and move both to the sonicator.Sonicate the vial for 30 seconds by horn. Follow this with bath sonication for 20 minutes. End with another 30 seconds of horned sonication.During sonication, prepare a container of graphitized carbon nanofibers. Get the sonicated ink and use a pipette to draw out 7.5 milliliters. Add the drawn out ink to the nanofibers.Now, sonicate the ink in ice with a horn for 30 seconds. Then by bath for 20 minutes. And by horn again, for 30 seconds.Have ready, an inverted rotator with a working electrode mounted on it. Here, a glassy carbon electrode is ready for coating. Start the electrode spinning at 100 RPM, and pipette 10 microliters of the sonicated ink on to it.When done, increase the rotation to 700 RPM. As the electrode drys, repeat the three sonication steps with the ink. With the mixture speed at 100 RPM, pipette and additional 10 micrograms of ink on to the working electrode, before increasing the rotation speed to 700 RPM.Fill the half cell with one-tenth molar perchloric acid. Now assemble the rotating disk electrode test station. The test station has a working reference, and counter electrode connected to the main testing cell.Next, connect the working electrode to a modulated speed controller. Then, submerge the working electrode tip in the acid. Set up a potentiostat to take electrochemical measurements.Prior to electrochemical conditioning, purge the electrolyte with nitrogen for seven minutes. Now, prepare to measure oxygen reduction polarization curves. Start the working electrode, rotating at 2500 RPM.Purge the electrolyte with oxygen. After seven minutes, set the oxygen purge to blanket the electrolyte. Slow the electrode rotation to 1600 RPM.Set the parameters for an automated linear sweep photometry measurement and run the experiment. When the measurement is completed, stop the rotation and discard the electrolyte. After refilling the cell with perchloric acid, and immersing the electrode, purge it with oxygen for seven minutes.Perform the linear sweep photometry measurement again, using the same parameters. These data show the platinum nickel nanowire composition as a function of the amount of the platinum precursor. Potassium tetrachloroplatinate, added to 40 milligrams of nickel nanowires during galvanic displacement.An increase of platinum precursor during galvanic displacement, increases the platinum content and the resulting catalyst. This plot is the electrochemical surface area versus the platinum displacement. Increasing platinum content, generally results in catalyst with lower platinum based electrochemical surface areas.Optimal performance occurred at a composition of 7.3%platinum. Here's the mass activity for the oxygen reduction reaction as a function of a kneeling temperature. A temperature of 250 degrees Celsius, produced catalyst with optimal mass activity.Once mastered, this technique can be completed at approximately one week, if performed properly. While attempting this procedure, it is important to remember that contaminants on a part-per-trillion level are electrochemically relevant. Following this procedure, other methods, including microscopy and membrane electrode assembly testing can be completed to answer additional questions, including kettle structure and device performance.From these protocols, we have developed extended service catalysts for proton and nano exchanged membrane fuel cells, electrolyzers and alcohol based fuel cells. After watching this video, you should have a good idea how to synthesize and electrochemically test platinum based extended surface electro-catalyst that demonstrate a high level of performance and durability in the ontra production reaction. Don't forget that working with concentrated acid and pressurized gas, particularly, hydrogen and carbon monoxide can be extremely hazardous and precautions such as, using personal protective equipment and ventilation control should always be taken while performing this procedure.

Research

JoVE Journal

Chemistry

Isolation and Preparation of Bacterial Cell Walls for Compositional Analysis by Ultra Performance Liquid Chromatography

通过超性能液相色谱对细菌细胞壁进行隔离和制备，进行组成分析

The bacterial cell wall is critical for the determination of cell shape during growth and division, and maintains the mechanical integrity of cells in the ...

科研

化学

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

合成和金插在介孔二氧化硅的墙壁催化性能

As a promising catalytically active nano reactor, gold nanoparticles intercalated in mesoporous silica (GMS) were successfully synthesized and properties ...

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues

优化合成蛋白质：Interpositional依赖性的鉴定指示在结构和/或功能性连接的残留

Protein alignments are commonly used to evaluate the similarity of protein residues, and the derived consensus sequence used for identifying functional ...

Synthesis and Characterization of Supramolecular Colloids

超分子胶体的合成与表征

Control over colloidal assembly is of utmost importance for the development of functional colloidal materials with tailored structural and mechanical ...

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

电化学 CO2还原的过渡金属单原子催化剂的合成及性能表征

This protocol presents both the synthesis method of the Ni single atom catalyst, and the electrochemical testing of its catalytic activity and selectivity ...

Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism

通过活性表面生长机制合成基片束缚金纳米线

Advancing synthetic capabilities is important for the development of nanoscience and nanotechnology. The synthesis of nanowires has always been a ...

A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction

直接溶液还原法快速合成金、钯、铂气凝胶的研究

Here, a method to synthesize gold, palladium, and platinum aerogels via a rapid, direct solution-based reduction is presented. The combination of various ...

Bio-inspired Polydopamine Surface Modification of Nanodiamonds and Its Reduction of Silver Nanoparticles

纳米金刚石的生物激发多巴胺表面改性及其对银纳米粒子的还原

Surface functionalization of nanodiamonds (NDs) is still challenging due to the diversity of functional groups on the ND surfaces. Here, we demonstrate a ...

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

利用uo2沉积制备 u2o5 薄膜, 利用原子氧和原子氢连续氧化还原

We describe a method to produce U2O5 films in situ using the Labstation, a modular machine developed at JRC Karlsruhe. The Labstation, an essential part ...