Etching‐Doping Sedimentation Equilibrium Strategy: Accelerating Kinetics on Hollow Rh‐Doped CoFe‐Layered Double Hydroxides for Water Splitting
Etching‐Doping Sedimentation Equilibrium Strategy: Accelerating Kinetics on Hollow Rh‐Doped CoFe‐Layered Double Hydroxides for Water Splitting
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DOI：
10.1002/adfm.202003556
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发表时间：
2020-07
影响因子：
19
通讯作者：
Keyu Zhu;Jiyi Chen;Wenjie Wang;Jiangwen Liao;Juncai Dong;M. Chee;Ning Wang;Pei Dong;P. Aj
中科院分区：
文献类型：
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作者：
Keyu Zhu;Jiyi Chen;Wenjie Wang;Jiangwen Liao;Juncai Dong;M. Chee;Ning Wang;Pei Dong;P. Aj
开发高活性、低成本的水裂解双功能电催化剂被认为是发展氢能技术的先决条件之一。在这里，提出了一种有效的同时蚀刻掺杂沉降平衡（EDSE）策略来设计和制备中空Rh掺杂CoFe-层状双氢氧化物用于整体水分解。具有优化组成和典型中空结构的精心制作的电催化剂加速了电化学反应，对于析氢反应（HER），在28 mV的过电位下可以实现10 mA cm−2的电流密度（188 mV下为600 mA cm−2），对于析氧反应（OER），在245 mV下可以实现100 mA cm−2的电流密度。由该电催化剂组装的电解槽的总水分解的槽电压仅为1.46 V，远低于由Pt/C和RuO 2以及大多数报道的双功能电催化剂构建的商业电解槽的值。此外，通过Rh掺杂引入的Fe空位和典型的中空结构的存在被证明优化整个HER和OER过程。EDSE将掺杂与模板导向的中空结构联系起来，为开发用于整体水分解的双功能电催化剂铺平了新的途径。它也被认为是实用的其他催化领域以及。
Exploring highly active and inexpensive bifunctional electrocatalysts for water‐splitting is considered to be one of the prerequisites for developing hydrogen energy technology. Here, an efficient simultaneous etching‐doping sedimentation equilibrium (EDSE) strategy is proposed to design and prepare hollow Rh‐doped CoFe‐layered double hydroxides for overall water splitting. The elaborate electrocatalyst with optimized composition and typical hollow structure accelerates the electrochemical reactions, which can achieve a current density of 10 mA cm−2 at an overpotential of 28 mV (600 mA cm−2 at 188 mV) for hydrogen evolution reaction (HER) and 100 mA cm−2 at 245 mV for oxygen evolution reaction (OER). The cell voltage for overall water splitting of the electrolyzer assembled by this electrocatalyst is only 1.46 V, a value far lower than that of commercial electrolyzer constructed by Pt/C and RuO2 and most reported bifunctional electrocatalysts. Furthermore, the existence of Fe vacancies introduced by Rh doping and the typical hollow structure are demonstrated to optimize the entire HER and OER processes. EDSE associates doping with template‐directed hollow structures and paves a new avenue for developing bifunctional electrocatalysts for overall water splitting. It is also believed to be practical in other catalysis fields as well.