posted on 2021-04-22, 12:03authored byLi Shen, Qing Zhang, Juan Luo, Hong Chuan Fu, Xiao Hui Chen, Li Li Wu, Hong Qun Luo, Nian Bing Li
There
still exists a resplendent prospect of developing a robust
and stable non-noble metal catalyst for overall water splitting. Herein,
we designed highly efficient amorphous FeMn-based electrocatalysts
toward oxygen/hydrogen evolution reactions (OER/HER) via a simple
electrodeposition method using Ni foam (NF) as the support. Nonmetal
heteroatoms are introduced to adjust the intrinsic properties through
this route without any post-treatment steps. Benefiting from the synergistic
effect of Fe and Mn species and nonmetal atoms, in 1.0 M KOH solutions,
FeMnOx efficiently drives the OER with
an overpotential of 220 mV at 10 mA cm–2, and P-FeMnOx is helpful for both the OER and the HER
(251 and 97 mV @ 10 mA cm–2) catalysis. Two electrolytic
tanks employing P-FeMnOx as a cathode
and FeMnOx/P-FeMnOx as anodes show low voltages reaching 50 mA cm–2 (1.62 and 1.68 V). This work highlights the combination of advantages
between nonmetal and different non-noble metal elements in high-performing
overall water electrocatalysis.