Etching-Doping Sedimentation Equilibrium Strategy: Accelerating Kinetics on Hollow Rh-Doped CoFe-Layered Double Hydroxides for Water Splitting

被引：156

作者：

Zhu, Keyu ^{[1
]}

Chen, Jiyi ^{[1
]}

Wang, Wenjie ^{[2
]}

Liao, Jiangwen ^{[3
]}

Dong, Juncai ^{[3
]}

Chee, Mason Oliver Lam ^{[4
]}

Wang, Ning ^{[5
]}

Dong, Pei ^{[4
,6
]}

Ajayan, Pulickel M. ^{[6
]}

Gao, Shangpeng ^{[2
]}

Shen, Jianfeng ^{[1
]}

Ye, Mingxin ^{[1
]}

机构：

[1] Fudan Univ, Inst Special Mat & Technol, Shanghai 200433, Peoples R China

[2] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

[4] George Mason Univ, Dept Mech Engn, Virginia Beach, VA 22030 USA

[5] King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, Adv Membranes & Porous Mat Ctr, Thuwal 239556900, Saudi Arabia

[6] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2020年 / 30卷 / 35期

基金：

中国国家自然科学基金;

关键词：

CoFe-layered double hydroxide; etching-doping sedimentation equilibrium; hollow structure; Rh; water splitting; BIFUNCTIONAL ELECTROCATALYSTS; NANOSHEETS; EFFICIENT; CATALYSTS; IDENTIFICATION;

D O I：

10.1002/adfm.202003556

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 RuO(2)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.

引用

页数：10

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