过电位
催化作用
析氧
材料科学
无定形固体
分解水
钴
化学工程
氧化还原
纳米技术
化学
结晶学
物理化学
有机化学
冶金
光催化
电化学
工程类
电极
作者
Ju Seong Kim,In-Chul Park,Euigyung Jeong,Kyoungsuk Jin,Won Mo Seong,Gabin Yoon,Hyun-Ah Kim,Byung–Hoon Kim,Ki Tae Nam,Kisuk Kang
标识
DOI:10.1002/adma.201606893
摘要
The development of a high‐performance oxygen evolution reaction (OER) catalyst is pivotal for the practical realization of a water‐splitting system. Although an extensive search for OER catalysts has been performed in the past decades, cost‐effective catalysts remain elusive. Herein, an amorphous cobalt phyllosilicate (ACP) with layered crystalline motif prepared by a room‐temperature precipitation is introduced as a new OER catalyst; this material exhibits a remarkably low overpotential (η ≈ 367 mV for a current density of 10 mA cm −2 ). A structural investigation using X‐ray absorption spectroscopy reveals that the amorphous structure contains layered motifs similar to the structure of CoOOH, which is demonstrated to be responsible for the OER catalysis based on density functional theory calculations. However, the calculations also reveal that the local environment of the active site in the layered crystalline motif in the ACP is significantly modulated by the silicate, leading to a substantial reduction of η of the OER compared with that of CoOOH. This work proposes amorphous phyllosilicates as a new group of efficient OER catalysts and suggests that tuning of the catalytic activity by introducing redox‐inert groups may be a new unexplored avenue for the design of novel high‐performance catalysts.
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