%0 Journal Article
%A Abdullah, Muhammad
Imran
%A Hameed, Asima
%A Hu, Tuoping
%A Zhang, Ning
%A Ma, Mingming
%D 2019
%T Crystalline Multi-Metal
Nanosheets Array with Enriched
Oxygen Vacancies as Efficient and Stable Bifunctional Electrocatalysts
for Water Splitting
%U https://acs.figshare.com/articles/journal_contribution/Crystalline_Multi-Metal_Nanosheets_Array_with_Enriched_Oxygen_Vacancies_as_Efficient_and_Stable_Bifunctional_Electrocatalysts_for_Water_Splitting/10354613
%R 10.1021/acsaem.9b01944.s001
%2 https://acs.figshare.com/ndownloader/files/18840206
%K vacancy
%K voltage
%K water splitting test
%K density
%K stability
%K hydrogen evolution reaction
%K electrocatalyst
%K cm
%K oxygen evolution reaction
%K mA
%K overpotential
%K CoFeNiO-NSA
%K OER
%K oxygen vacancies
%K CoFeNi-NSA
%K NSA
%K Crystalline Multi-Metal Nanosheets Array
%K 150 h HER
%K Stable Bifunctional Electrocatalysts
%K Enriched Oxygen Vacancies
%K mV
%X The electrolysis of water on a large scale for hydrogen
production
needs low cost, efficient, and stable electrocatalysts for the hydrogen
evolution reaction (HER) and oxygen evolution reaction (OER). Herein,
we report the synthesis of a crystalline multimetal (Co, Ni, Fe) nanosheets
array (NSA) enriched with oxygen vacancies by a simple electrosynthesis
method, which can serve as efficient and stable electrocatalysts for
both OER and HER. The oxygen vacancies are generated by electro-oxidation
or electro-reduction of CoFeNiSe precursor via the replacement of
selenium by oxygen. For HER, as synthesized CoFeNi-NSA achieved a
400 mA cm–2 current density at a low overpotential
of −211 mV. For OER, CoFeNi-NSA was in situ oxidized to form
CoFeNiO-NSA, which achieved a 400 mA cm–2 current
density at a low overpotential of 270 mV. The activities of CoFeNi-NSA
and CoFeNiO-NSA remained stable after 150 h HER or OER test at high
current densities, showing higher activity and stability than noble-metal
electrocatalysts Pt/C and IrO2, respectively. The electrolytic
cell of CoFeNiO-NSA∥CoFeNi-NSA can achieve a high current density
of 400 mA cm–2 at a moderate voltage of 1.98 V.
During a long-term water splitting test, the voltage of the electrolytic
cell remained stable at 1.76 V for 150 h at a current density of 120
mA cm–2, indicating that these catalysts have both
high activity and stability for OER and HER reactions.
%I ACS Publications