Trimetallic Oxyhydroxide Coralloids for Efficient Oxygen Evolution Electrocatalysis.
Trimetallic oxyhydroxides are one of the most effective materials for oxygen evolution reaction (OER) catalysis, a key process for water splitting. Herein, we describe a facile wet-chemical method to directly grow a series of coralloid trimetallic oxyhydroxides on arbitrary substrates such as nickel foam (NF) and carbon nanotubes (CNTs). The amount of iron in these oxyhydroxide sponges on NF and CNTs was precisely controlled, revealing that the electrocatalytic activity of the WCoFe trimetallic oxyhydroxides depends on the Fe amount in a volcano-like fashion. The optimized W0.5Co0.4Fe0.1/NF catalyst exhibited an overpotential of only 310 mV to deliver a large current density of 100 mA cm-2and a very low Tafel slope of 32 mV dec-1. It also showed superior stability with negligible activity decay after use in the OER for 21 days (>500 h). X-ray photoelectron spectroscopy revealed that the addition of Fe leads to an on average lower Co oxidation state, which contributes to the enhanced OER performance.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.
Yecan
Y
Pi
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.
Qi
Q
Shao
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.
Pengtang
P
Wang
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.|The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China.|Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China.
Fan
F
Lv
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.|The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China.|Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China.
Shaojun
0000-0002-5941-414X
S
Guo
Testing & Analysis Center, Soochow University, Jiangsu, 215123, China.
Jun
J
Guo
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.
Xiaoqing
X
Huang
coralloid structures; electrocatalysis; oxygen evolution; trimetallic oxyhydroxides