Pd/CuO–Ni(OH)2/C as a highly efficient and stable catalyst for the electrocatalytic oxidation of ethanol

Sifan Zhang; An Pei; Guang Li; Lihua Zhu; Guoda Li; Fengshun Wu; Shuting Lin; Wenqi Chen; Bing Hui Chen; Rafael Luque

doi:10.1039/D1GC04799J

Pd/CuO–Ni(OH)₂/C as a highly efficient and stable catalyst for the electrocatalytic oxidation of ethanol†

Sifan Zhang,‡^a An Pei,‡^a Guang Li,‡^b Lihua Zhu,

*^aef Guoda Li,^a Fengshun Wu,^a Shuting Lin,^a Wenqi Chen,^a Bing Hui Chen

^b and Rafael Luque

*^cd

Author affiliations

* Corresponding authors

^a Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, College of Chemistry and Chemical Engineering, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
E-mail: zhulihua@jxust.edu.cn

^b National Engineering Laboratory for Green Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

^c Departamento de Química Orgánica, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie (C-3), Ctra Nnal IV, Km 396, Córdoba, Spain

^d Peoples Friendship University of Russia (RUDN University), 6 Miklukho Maklaya str., Moscow, Russia

^e Key Laboratory of Fuel Cell Technology of Guangdong Province, South China University of Technology, Guangzhou 510640, China

^f Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, China

Abstract

A novel-Pd/CuO–Ni(OH)₂/C catalyst utilizing carbon black as a support was successfully synthesized using hydrazine hydrate reduction and galvanic replacement strategies and was subsequently tested for activity in the electrocatalytic oxidation of ethanol. The observed peak current density (3.74 A mg_Pd⁻¹) for Pd/CuO–Ni(OH)₂/C was 19.68 times higher than that of commercial Pd/C (0.19 A mg_Pd⁻¹). The as-synthesized Pd/CuO–Ni(OH)₂/C (hereafter denoted as PdCuNi/C) catalyst exhibited a significantly improved electrocatalytic activity and durability compared with Pd/C, PdNi/C, PdCu/C and the PdCuNi/C catalysts reduced in N₂/H₂ at different temperatures. The reason for this is that the high dispersion of Pd resulted in the exposure of more active sites on the surface of the catalyst. The excellent CO₂ selectivity of Pd/CuO–Ni(OH)₂/C (22.5%) for the ethanol electronic oxidation reaction (EOR) was observed using in situ Fourier transform infrared spectroscopy (FTIR) spectra and could be attributed to the synergistic effect of Pd, CuO and Ni(OH)₂ and the presence of the OH_ad adsorption at Ni(OH)₂ at a low potential.

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Pd/CuO–Ni(OH)₂/C as a highly efficient and stable catalyst for the electrocatalytic oxidation of ethanol†

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Pd/CuO–Ni(OH)₂/C as a highly efficient and stable catalyst for the electrocatalytic oxidation of ethanol

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