In Situ Construction Of Chain-Like Pdag/Agcl Heterojunction Electrocatalyst for Ethylene Glycol Oxidation

Abstract

In this paper, PdAg/AgCl heterojunction catalyst with chain structure has been synthesized using using triblock copolymer P123 as protective agent and reducing agent. In the process of PdAg synthesis, a small amount of AgCl is generated in situ, and finally the chain PdAg/AgCl heterojunction electrocatalyst is constructed. The chain structure mainly comes from the special chain structure of P123 itself. Electrochemical tests indicate that the PdAg/AgCl catalyst has good catalytic activity and stability for ethylene glycol, and its peak current density is 3.98 times that of commercial Pd/C. Compared with pure PdAg, the mass activity of glycol oxidation of PdAg-AgCl was increased by 1.52 times. After 500 cycles, the decay of catalytic activity decreased from 45.4% to 7.4%. The significant improvement of the catalytic activity and stability of the compound catalyst may be attributed to the co-catalytic effect of AgCl on the surface of PdAg and its special chain structure.

Keywords: PdAg/AgCl, Heterojunction electrocatalystt, Co-catalytic effect, Ethylene glycol oxidation, Fuel cell