An Effective Carbon-Supported High-Entropy-Alloy Catalyst of PtPdNiCoBi for Ethylene Glycol Electrooxidation

The Pt-based catalysts are quite promising for ethylene glycol oxidation reaction (EGOR) due to their superior catalytic activity and their high cost, low reserves and poor stability of precious metals greatly limit the further large-scale application. Developing low-Pt and high-performance anode electrocatalysts is urgent to direct ethylene glycol fuel cells. At present, a high-entropy alloy (HEA) of PtPdNiCoBi/C has been developed for EGOR, and its catalytic performance has been verified by electrochemical and physical methods. Notably, the EGOR peak current density on PtPdNiCoBi/C (0.782 A mg⁻¹_PtPd) reaches 3.54 times of Pt/C (0.221 A mg⁻¹_Pt), and the residual current on PtPdNiCoBi/C (0.092 A mg⁻¹_PtPd) is superior to that of Pt/C (0.076 A mg⁻¹_Pt) after 3000 s. Moreover, the current density retention (84.0%) of it after 500 cycles, is also superior to that of the Pt/C (78.8%). This work would support the future practical use of HEA catalyst for fuel cells.