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Abstract
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Developing highly efficient, stable, cost-effective, and earth-rich bifunctional electrocatalysts for overall water
splitting (OWS) is crucial for achieving large-scale hydrogen (H2) production. Herein, we report a cobalt molybdenum
oxide/sponge-like nitrogen and sulfur co-doped carbon composite (CoMoO4/N, S co-doped carbon) as
an effective bifunctional electrocatalyst for OWS. The CoMoO4/N, S co-doped carbon composite was prepared by
a facile hydrothermal process, which exhibited a superior electrocatalytic activity toward both oxygen evolution
reaction (OER) and hydrogen evolution reaction (HER). Remarkably, the CoMoO4/N, S co-doped carbon
possessed low overpotentials of 220 and 89 mV for OER and HER at a current density of 10 mA cm 2, respectively.
Besides, the assembled CoMoO4/N, S co-doped carbon || CoMoO4/N, S co-doped carbon only required a
cell voltage of 1.54 V to reach a current density of 10 mA cm 2 and also revealed significant durability in alkaline
media for over 18 h. The high catalytic activity of the CoMoO4/N, S co-doped carbon is benefited from N and S
co-doping into the carbon structure along with the simultaneous presence of metal species in CoMoO4. This
ensures several electroactive sites in the CoMoO4/N, S co-doped carbon composite, resulting in an outstanding
catalytic activity for OWS. Thus, the successful development of non-precious metal and carbonaceous materials
opens up a new opportunity to design cost-effective electrocatalysts for the OWS.
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