Electrocatalyst Screening on a Massive Array of Closed Bipolar Microelectrodes
Electrocatalyst Screening on a Massive Array of Closed Bipolar Microelectrodes
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DOI：
10.1149/1945-7111/ac2acc
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发表时间：
2021-10-01
影响因子：
3.9
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Anderson, Todd J.;Defnet, Peter A.;Zhang, Bo
在这里，我们报告了使用一个大规模的双极超微电极（UME）阵列结合电化学发光（ECL）成像作为一种新的电分析平台，用于快速筛选电催化剂。根据我们最近对碳双极UME阵列的研究，我们开发了不对称的碳-金双极UME阵列，其中每个碳UME在一侧被薄的金膜涂覆。为了产生大量的组成变化的电催化剂样品，通过用微量移液管将金属盐溶液的羽流递送到阵列表面，同时整个阵列在还原电位下偏置，将催化金属的径向梯度电沉积在这些UME阵列的表面上。然后利用这些双极UME阵列研究了不同Ni（OH）（2）覆盖度对碱性溶液中Au表面析氢反应（HER）催化活性的影响，证实了改性Au的催化性能表现出对Ni（OH）（2）覆盖度增加的峰形依赖性。我们未来的工作将扩展这个独特的平台，通过在梯度电沉积过程中加入额外的微量移液器，将多种金属盐输送到阵列中，从而筛选各种金属合金。
Herein, we report the use of a massive array of bipolar ultramicroelectrodes (UMEs) in conjunction with electrochemiluminescence (ECL) imaging as a novel electroanalytical platform for rapid screening of electrocatalysts. Following our recent work on carbon bipolar UME arrays, we have developed asymmetric carbon-gold bipolar UME arrays where each carbon UME is coated by a thin gold film on one side. To generate large quantities of compositionally varied electrocatalyst samples, a radial gradient of catalytic metal is electrodeposited on the surface of these UME arrays by delivering a plume of metal salt solution to the array surface with a micropipette while the entire array is biased at a reducing potential. We then utilize these bipolar UME arrays to investigate the impact of varied Ni(OH)(2) coverage on the catalytic activity for hydrogen evolution reaction (HER) of an Au surface in alkaline solution, with the catalytic performance of the modified Au being confirmed to exhibit a peak-shaped dependence on increasing Ni(OH)(2) coverage. Our future work will expand this unique platform to enable the screening of various metal alloys by incorporating additional micropipettes for delivering multiple metal salts to the array during the gradient electrodeposition process.