posted on 2022-11-21, 22:33authored byShuo Chen, Zhicheng Zheng, Fenglin Wang, Hao Wan, Gen Chen, Ning Zhang, Xiaohe Liu, Renzhi Ma
Rationally
tuning the electronic structure and morphology of catalysts
is a vital strategy to boost the catalytic activity. Herein, flower-like
cobalt–ruthenium phosphide nanosheets (CoRuP NS) are reported
for efficient electrocatalytic overall water splitting. A general
principle for precisely modulating the electronic structure of bimetallic
phosphate catalysts is developed. The competitive effect between Co
and Ru atoms combining with the P atoms is revealed. Hydrogen evolution
reaction (HER) activity of CoRuP NS shows a strong interaction with
the electron redistribution of the P–metal structure. Benefiting
from fully exposed active sites, hierarchical nanostructure, and optimum
electron configuration, the CoRuP NS exhibit outstanding HER activity
with an overpotential of 54.2 mV at 10 mA cm–2 comparable
to that of 20% Pt/C. In addition, the catalysts possess appreciable
oxygen evolution reaction (OER) activity with an overpotential of
282.9 mV at 10 mA cm–2. As a result, the CoRuP NS
(+) || CoRuP NS (−) cell was constructed, requiring a small
voltage of 1.55 V for efficient overall water splitting at 20 mA cm–2. This work provides an innovative strategy for designing
bimetallic phosphating phosphate catalysts.