Ultrastable and Phosphoric Acid-Resistant PtRhCu@Pt Oxygen Reduction Electrocatalyst for High-Temperature Polymer Electrolyte Fuel Cells

• DOI: 10.1021/acscatal.3c04488
• Publication Date: 2024-02-03T14:30:21Z
• Authors: Zhao An; Huanqiao Li; Xiaoming Zhang; Zhangxun Xia; Hong Zhang; Wenling Chu; Shansheng Yu; Suli Wang; Gongquan Sun
• Keywords: Phosphoric acid; Polymer Electrolytes

With much enhanced fuel flexibility to overcome the shortcomings of hydrogen production and storage, high-temperature polymer electrolyte membrane cells (HT-PEMFCs) are still facing challenges activity loss oxygen reduction electrocatalyst under working circumstance phosphoric acid (PA) electrolyte. Dissolution leaching metal component PtM (M = Cu, Co, Ni···) electrocatalysts is one key factors that degrade their initial resistance toward PA hinder accessing durability simultaneously. Here, we report an ultradurable PtRhCu@Pt/C with a high mass 0.90 A mg–1Pt, which only decreased by 14.4% after 30K ADT cycles in half-cell reaches DOE at 2025 target (<30 mV 0.8 cm–2) 27 voltage cm–2 single-cell. After adding 0.1 M into electrolyte, half-wave potential negatively shifted 52 mV, lower than commercial Pt/C (90 mV). Moreover, HT-PEMFC assembled this catalyst delivers preeminent peak power density 529 977 mW H2–air H2–O2 conditions, respectively. Experiments theoretical calculations reveal ligand effect arising from sublayer Cu attributed ability resistance, while self-healing behavior synergy between PtRhCu core Pt shell ensures stability.