Construction of Dual-functional 2D/3D Hydrid Co2P-CeO x Heterostructure Integrated Electrode for Electrocatalytic Urea Oxidation Assisted Hydrogen Production

doi:10.7503/cjcu20220082

Abstract

Abstract:

A high catalytic activity and stable dual-functional hierarchical 2D/3D hybrid Co₂P-CeO _x integrated electrode（Co₂P-CeO _x /NF） for electrocatalytic urea oxidation assisted hydrogen production was prepared by multi-step electrodeposition and low-temperature phosphating on nickel foam（NF）. Through the strong interfacial interaction and electron synergistic coupling between 3D CeO _x nanoflower and 2D Co₂P nanosheet， the as-prepared Co₂P-CeO _x /NF exhibited high conductivity， catalytic activity and stability， and enhanced the electrocatalytic hydrogen evolution reaction（HER） and urea oxidation reaction（UOR） performance. Assembling an electrolyzer with a straight substitution of UOR for oxygen evolution reaction（OER）， it needed only 1.42 V to achieve a current density of 30 mA/cm²， which was 0.17 V less than that required for water splitting. After 10 h of electrocatalysis， the degradation efficiency of urea reached 76.4%， realizing the preparation of clean energy hydrogen and synchronous wastewater purification， opening up a new path for green energy development and environmental governance. Based on the comprehensive analysis above， the electron transfer at the heterogeneous interfaces between 2D Co₂P nanosheet and 3D CeO _x nanoflower would cause the rearrangement of surface/interfacial charges； the formed oxygen vacancies provided coordination unsaturated sites， exposed more active sites， optimized the adsorption energy of reactant molecules on the catalyst surface and promoted molecular activation， making it have higher catalytic activity. In this study， a 2D/3D hybrid Co₂P-CeO _x heterojunction was constructed to regulate the charge states at the surface/interface of the electrocatalyst and thus improve the catalyst activity， providing a new idea for the construction of other efficient electrocatalysts.

Key words: Transition metal phosphide nanosheet, Cerium oxide nanoflower, Electrocatalysis, Urea oxidation reaction, Hydrogen evolution reaction

CLC Number:

O649

TrendMD:

YANG Lijun, YU Yang, ZHANG Lei. Construction of Dual-functional 2D/3D Hydrid Co₂P-CeO _x Heterostructure Integrated Electrode for Electrocatalytic Urea Oxidation Assisted Hydrogen Production[J]. Chem. J. Chinese Universities, 2022, 43(6): 20220082.

Figures/Tables 8

References 44

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Construction of Dual-functional 2D/3D Hydrid Co₂P-CeO _x Heterostructure Integrated Electrode for Electrocatalytic Urea Oxidation Assisted Hydrogen Production

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