Regulating CoP\(_{x}\)/Co heterostructures for enhanced electrocatalytic activity toward hydrazine oxidation reaction

Qinquan LIN; Rui ZHANG; Changli YAN; Qizhao HU; Shangbin SANG; Qiumei  WU; Kaiyu LIU; Hongtao LIU

doi:10.55713/jmmm.v35i2.2348

Authors

Qinquan LIN State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Rui ZHANG Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
Changli YAN Hangzhou Win-Win Technology Co. LTD, No. 157, Yunqi Road, Tongjun Street, Tonglu County, Hangzhou, China
Qizhao HU Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
Shangbin SANG Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
Qiumei WU State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Kaiyu LIU Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
Hongtao LIU Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

DOI:

https://doi.org/10.55713/jmmm.v35i2.2348

Keywords:

Electrocatalyst, Heterostructure, Hydrazine oxidation reaction, Electrodeposition

Abstract

Hydrazine hydrate (N₂H₄∙H₂O) is considered an ideal fuel for fuel cells. Constructing a cobalt phosphide/cobalt (CoP_x/Co) heterostructure can achieve efficient electrocatalytic activity for hydrazine oxidation reaction. Traditional strategies for constructing CoP_x/Co heterostructures took less consideration on the exposure of the active sites. In this study, 3D nanoflower-like nano CoP_x/Co heterostructures with highly exposed active sites were obtained on a nickel foam (NF) through a dual-component phosphating strategy, i.e., regulating the relative content of Co and Co(OH)₂ with cathodic current density and utilizing the differences in their phosphating behaviors. The potential at 100 mA∙cm^‒2 and Tafel slope of the optimized CoP_x/Co(375)@NF electrode prepared with the cathodic current density of 375 mA∙cm^‒2 are ‒37.4 mV (vs.RHE) and 58.9 mA∙dec^‒1, respectively, in a 0.2 M N₂H₄∙H₂O solution. The stable potential was maintained after 12 h under a high current density of 100 mA∙cm^‒2. The superior electrocatalysis activity toward N₂H₄∙H₂O is proved closely relative with the constructing of CoP_x/Co heterostructure. This study provides a new strategy for the development of efficient hydrazine oxidation catalysts by using a dual-component phosphating approach to fully expose the active sites of the CoP_x/Co heterostructure.

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