AUTHOR=Tang Siyuan , Zhang Zhipeng , Xiang Jun , Yang Xinchun , Shen Xiangqian , Song Fuzhan TITLE=Recent advances in transition metal nitrides for hydrogen electrocatalysis in alkaline media: From catalyst design to application JOURNAL=Frontiers in Chemistry VOLUME=Volume 10 - 2022 YEAR=2022 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.1073175 DOI=10.3389/fchem.2022.1073175 ISSN=2296-2646 ABSTRACT=With the increase of population as well as energy demand, hydrogen (H2) is considered as a clean candidate that can replace fossil fuel to meet future energy demand. Although platinum group metal (PGM) catalysts have excellent performance, their scarcity and high cost limit the industrial application. Therefore, it is necessary to develop low-cost and efficient non-PGM catalysts. Transition metal nitrides (TMNs) have attracted much attention because of their excellent hydrogen electrochemistry, including hydrogen evolution reaction (HER)/hydrogen oxidation reaction (HOR) performance. In this paper, we first review and discuss the mechanism of HER/HOR in alkaline media. Based on these understanding, we compare and evaluate electrocatalytic performance for the HER/HOR TMNs catalysts recently reported. Finally, we look forward to the sustainable and clean hydrogen energy devices and prospects and research trends.