Two‐Dimensional Nanosheet Structure of Co, S Co‐Doped Carbon‐Framework Supported MoO₂ for Hydrogen Evolution Reaction in Alkaline Solutions

Abstract

Searching a low-cost and excellent performance catalyst for hydrogen evolution reaction (HER) is important for enhancing the efficiency of water splitting. In this manuscript, we report the Co, S co-doped carbon-framework supported MoO 2 nanosheets (Co, S/MoO 2 À C) for HER. The carbon-framework improves the distribution of the MoO 2 , which causes a large number of exposed active sites. The synergistic effect of Co and S enhances the electron transport of the MoO 2. As a result, the Co, S/MoO 2 À C exhibits a low overpotential (62 mV vs. RHE) and enhanced stability in 1 M KOH for HER. Our work puts forward a novel method to improve the catalytic performance of MoO 2 and provides a new option to prepare excellent catalysts.

Critical Review, Recent Updates on Zeolitic Imidazolate Framework‐67 (ZIF‐67) and Its Derivatives for Electrochemical Water Splitting

“…Reproduced with permission. [257] Copyright 2020, John Wiley and Sons. Further, Shi et al investigated the catalytic activity of NiFe alloy decorated NiCoO 2 hollow polyhedron (NiFe-NiCoO 2 ).…”

“…[255,256] To resolve this issue, Zhang et al proposed a strategy to immobilize MoO 2 NSs on Co, S co-doped carbon frameworks (Co,S/MoO 2 -C). [257] In this method, MoO 2 and ZIF-67 were first treated hydrothermally to gain ZIF-67@MoO 2 as purple-black solid, which was then transformed into desired product by vulcanization under Ar atmosphere. Unlike pure MoO 2 , Co,S/MoO 2 -C had a large specific surface area and controllable electronic structure, which provided better exposure of the active site and improved electron transport, respectively.…”

“…h) LSV curve of CoS/MoO 2 -C collected in 1 m KOH. Reproduced with permission [257]. Copyright 2020, John Wiley and Sons.…”

Ultrasmall Pt Nanoparticles-Loaded Crystalline MoO2/Amorphous Ni(OH)2 Hybrid Nanofilms with Enhanced Water Dissociation and Sufficient Hydrogen Spillover for Hydrogen Generation

“…Until now, Pt is regarded as an HER benchmark electrocatalyst due to its high activity. , However, the high cost and scarcity of Pt make its highly efficient utilization extremely important. Loading Pt on the transition-metal compound is a promising way to enhance the utilization of Pt for the HER process. , MoO 2 with a monoclinic phase displays metallic character due to delocalized Mo atoms, which can promote the migration of electrons in a redox reaction. , Besides, it can tightly anchor Pt by the strong Pt–O–Mo bond and prevent the agglomeration of Pt nanoparticles . Moreover, the adsorbed H atoms can spill from the hydrogen-enriched Pt to hydrogen-deficient MoO 2 in the HER process due to the thermodynamic advantage, − which makes recombination of the adsorbed H atoms to H 2 molecules more feasible .…”

“…5,6 MoO 2 with a monoclinic phase displays metallic character due to delocalized Mo atoms, which can promote the migration of electrons in a redox reaction. 7,8 Besides, it can tightly anchor Pt by the strong Pt−O−Mo bond and prevent the agglomeration of Pt nanoparticles. 9 Moreover, the adsorbed H atoms can spill from the hydrogen-enriched Pt to hydrogen-deficient MoO 2 in the HER process due to the thermodynamic advantage, 10−12 which makes recombination of the adsorbed H atoms to H 2 molecules more feasible.…”