Chem. Commun., 2025, Accepted Manuscript DOI: 10.1039/D5CC05109F, Communication Yubei Du, Haining Wang, Jiayi Chen, Hongxuan Chen, Sibo Wang, Xue Feng Lu Developing efficient hydrogen evolution electrocatalysts is crucial for green hydrogen production, which plays an important role in a zero-carbon society. Herein, ultrafine NiIr nanoclusters confined in hollow mesoporous carbon were...