Ruthenium-Doped Cobalt-Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

被引：103

作者：

Dong, Chenlong ^{[1
]}

Zhang, Xilin ^{[2
,3
]}

Xu, Jie ^{[4
,5
]}

Si, Rui ^{[6
]}

Sheng, Jun ^{[1
]}

Luo, Jun ^{[4
,5
]}

Zhang, Shaoning ^{[7
,8
]}

Dong, Wujie ^{[7
,8
]}

Li, Guobao ^{[1
]}

Wang, Weichao ^{[2
,3
]}

Huang, Fuqiang ^{[1
,7
,8
]}

机构：

[1] Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China

[2] Henan Normal Univ, Sch Phys, Xinxiang 453007, Henan, Peoples R China

[3] Nankai Univ, Renewable Energy Convers & Storage Ctr, Natl Inst Adv Mat, Dept Elect,Tianjin Key Lab Photoelect Thin Film D, Tianjin 300071, Peoples R China

[4] Tianjin Univ OfTechnol, Ctr Electron Microscopy, Inst New Energy Mat & Low Carbon Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China

[5] Tianjin Univ OfTechnol, Tianjin Key Lab Adv Funct Porous Mat, Inst New Energy Mat & Low Carbon Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China

[6] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

[7] Chinese Acad Sci, CAS Key Lab Mat Energy Convers, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

[8] Chinese Acad Sci, State Key Lab High Performance Ceram & Superfine, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

来源：

SMALL | 2020年 / 16卷 / 05期

基金：

国家重点研发计划;

关键词：

charge transfer; lattice doping; layered double hydroxides; oxygen evolution reaction; single atoms; ELECTROCATALYST; PEROVSKITE; NANOSHEETS; CATALYSTS; EXAFS; WATER;

D O I：

10.1002/smll.201905328

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Exploring the origin of transition metal (TM) lattice-doped layered double hydroxides (LDHs) toward the oxygen evolution reaction (OER) plays a crucial role in engineering efficient electrocatalysts. Without understanding the physics behind the TM-induced catalytic enhancements, it would be challenging to design the next generation of electrocatalysts. Herein, single Ru atoms are introduced into a CoCr LDHs lattice to improve activity. In 0.1 m KOH, CoCrRu LDHs require only 290 mV overpotential to drive to 10 mA cm(-2) and show a Tafel slope of 56.12 mV dec(-1). Electronic structure analyses based on density functional theory confirm that promoted OER activity originates from synergetic charge transfer among Ru, Cr, and Co elements. Specifically, Ru dopants can downshift d states of Co and enhance electron donation of Cr to oxygenates, which essentially breaks the scaling relation and achieves higher activity. This work provides insights into how single atomic Ru dopant tunes the electronic structures of its neighbor's active site Co and thus increases OER activities.

引用

页数：7

共 32 条

[1] Building better batteries [J].