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Zhang, K. X.; Liang, X.; Wang, L. N.; Sun, K.; Wang, Y. N.; Xie, Z. B.; Wu, Q. N.; Bai, X. Y.; Hamdy, M. S.; Chen, H.; Zou, X. X. Status and perspectives of key materials for PEM electrolyzer.?Nano Res. Energy?2022, 1: e9120032. DOI: 10.26599/NRE.2022.9120032.?https://doi.org/10.26599/NRE.2022.9120032