CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

Wenwen Song; Yanqi Xu; Xiangli Xie; Cunjun Li; Wenfeng Zhu; Qiankun Xiang; Wei Chen; Ningli Tang; Linjiang Wang

doi:10.1021/acsami.3c01541

CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

ACS Appl Mater Interfaces. 2023 Jun 7;15(22):27253-27263. doi: 10.1021/acsami.3c01541. Epub 2023 May 22.

Authors

Wenwen Song¹, Yanqi Xu^{1

2}, Xiangli Xie³, Cunjun Li^{1

2}, Wenfeng Zhu^{1

2}, Qiankun Xiang⁴, Wei Chen⁵, Ningli Tang³, Linjiang Wang^{1

2}

Affiliations

¹ College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.
² Key Laboratory of New Technology for Processing Nonferrous Metals and Materials, Ministry of Education; Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin University of Technology, Guilin 541004, China.
³ College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
⁴ Shenzhen Shenai Semiconductor Co., Ltd., Shenzhen 518116, China.
⁵ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

PMID: 37216444
DOI: 10.1021/acsami.3c01541

Abstract

Electrocatalytic efficiency and stability have emerged as critical issues in the ethanol oxidation reaction (EOR) of direct ethanol fuel cells. In this paper, Pd/Co₁Fe₃-LDH/NF as an electrocatalyst for EOR was prepared by a two-step synthetic strategy. Metal-oxygen bonds formed between Pd nanoparticles and Co₁Fe₃-LDH/NF guaranteed structural stability and adequate surface-active site exposure. More importantly, the charge transfer of the formed Pd-O-Co(Fe) bridge could effectively modulate the electrical structure of hybrids, improving the facilitated absorption of OH^- radicals and oxidation of CO_ads. Benefiting from the interfacial interaction, exposed active sites, and structural stability, the observed specific activity for Pd/Co₁Fe₃-LDH/NF (17.46 mA cm^-2) was 97 and 73 times higher than those of commercial Pd/C (20%) (0.18 mA cm^-2) and Pt/C (20%) (0.24 mA cm^-2), respectively. Besides, the j_f/j_r ratio representing the resistance to catalyst poisoning was 1.92 in the Pd/Co₁Fe₃-LDH/NF catalytic system. These results provide insights into optimizing the electronic interaction between metals and the support of electrocatalysts for EOR.

Keywords: electrocatalytic activity; ethanol oxidation reaction; interfacial interaction; layered double hydroxide; noble-metal nanoparticles.