Liu, QingqingLiu, HuiyuanZhang, WeiqiXu, QianKhotseng, LindiwePasupathi, SivakumarSu, Huaneng2026-05-222026-05-222025Liu, Q., Liu, H., Zhang, W., Xu, Q., Khotseng, L., Pasupathi, S., & Su, H. (2025). Enhanced activity and durability of high-temperature proton exchange membrane fuel cells enabled by ionic liquid-modified Pt-Ni nanochains. Energy, https://doi.org/10.1016/j.energy.2025.13958810.1016/j.energy.2025.139588https://hdl.handle.net/10566/22795The performance of high-temperature proton exchange membrane fuel cells (HT-PEMFCs) is severely limited by the poisoning effect and low oxygen solubility of the phosphoric acid (PA) electrolyte. To address this, we report an innovative catalyst architecture consisting of one-dimensional hollow PtNi nanochains coated with a functional ionic liquid (IL), termed PtNi@IL/C. This design creates a multifunctional interface that demonstrates exceptional PA tolerance, achieving an oxygen reduction reaction (ORR) half-wave potential of 0.840 V in a PA-containing electrolyte, which is 90 mV higher than commercial Pt/C.enCatalyst durabilityHigh temperature proton exchange membrane fuel cellIonic liquidOxygen reduction reactionPt-Ni alloy catalystArticle