Authors: Xiaoyu Tian, Renjie Ren, Fengyuan Wei, Jiajing Pei, Zhongbin Zhuang, Lin Zhuang, Wenchao Sheng
Published: 2024-01-02
DOI: 10.1038/s41467-023-44320-w
Source: Full article
AbstractNi-based hydrogen oxidation reaction (HOR) electrocatalysts are promising anode materials for the anion exchange membrane fuel cells (AEMFCs), but their application is hindered by their inherent instability for practical operations. Here, we report a TiO2supported Ni4Mo (Ni4Mo/TiO2) catalyst that can effectively catalyze HOR in alkaline electrolyte with a mass activity of 10.1 ± 0.9 A g−1Niand remain active even up to 1.2 V. The Ni4Mo/TiO2anode AEMFC delivers a peak power density of 520 mW cm−2and durability at 400 mA cm−2for nearly 100 h. The origin for the enhanced activity and stability is attributed to the down-shifteddband center, caused by the efficient charge transfer from TiO2to Ni. The modulated electronic structure weakens the binding strength of oxygen species, rendering a high stability. The Ni4Mo/TiO2has achieved greatly improved stability both in half cell and single AEMFC tests, and made a step forward for feasibility of efficient and durable AEMFCs.