Development of a Hemispherical Cavity Cobalt Electrocatalyst for Water Oxidation Based on a Polystyrene Colloidal Template Electrodeposition Method
Development of a Hemispherical Cavity Cobalt Electrocatalyst for Water Oxidation Based on a Polystyrene Colloidal Template Electrodeposition Method
复制标题
DOI：
10.1002/slct.202200600
复制
发表时间：
2022-08
期刊：
影响因子：
2.1
通讯作者：
Yusaku Araki;Shun Tsunekawa;Arisu Sakai;K. Harada;Ryosuke Nagatsuka;M. Suzuki-Sakamaki;K. Amemiya;Ke-Hsuan Wang;T. Kawai;Masaaki Yoshida
中科院分区：
文献类型：
--
作者：
Yusaku Araki;Shun Tsunekawa;Arisu Sakai;K. Harada;Ryosuke Nagatsuka;M. Suzuki-Sakamaki;K. Amemiya;Ke-Hsuan Wang;T. Kawai;Masaaki Yoshida
利用可再生能源通过水电解生产氢气有望成为解决当前能源问题的一种方法。本文报道了在碳酸盐电解液中，以聚苯乙烯颗粒为模板，在氧化铟锡(ITO)衬底上电沉积具有几百纳米均匀孔径的半球状Co(Co)电催化剂。催化活性测试表明，空腔Co催化剂比平板Co催化剂产生了更大的析氧电流。为了研究催化剂的电子态和局域结构，在工作条件下获得了腔钴催化剂的操纵面Co K边XAFS测量，结果表明催化剂中的Co物种在保持CoOOH(CoO6)的局域结构的同时，发生了较高的氧化数变化。这些结果表明，空腔Co催化剂通过CoOOH结构中氧化Co含量较高的均匀纳米孔有效地促进了水的裂解。
Hydrogen production through water electrolysis using renewable energy is expected to be one approach to solving current energy problems. The present report describes the development of a hemispherical cavity cobalt (Co) electrocatalyst with uniform pores with sizes of several hundred nanometers on the surfaceviaelectrodeposition on an indium tin oxide (ITO) substrate in a carbonate electrolyte solution using a polystyrene particle template. Catalytic activity measurements indicated that the cavity Co catalyst generated a greater oxygen evolution current compared to the flat Co catalyst. To investigate the electronic state and local structure, operando Co K‐edge XAFS measurements of the cavity Co catalyst were obtained under working conditions, which showed that Co species in the catalyst changed to one with a higher oxidation number while maintaining the local structure of CoOOH (CoO6). These results clarified that the cavity Co catalyst efficiently promoted water splitting through the uniform nanoscale pores with high oxidation Co in the CoOOH structure.