A Hydrazine‒Water Galvanic Cell‐Inspired Self‐Powered High‐Rate Hydrogen Production via Overall Hydrazine Electrosplitting
Linjie Zhang, Man Li, Chen Sun, Hsiao‐Tsu Wang, Yi Xiao, Ke Ma, Yimeng Cai, Cheng‐You Lee, Yu‐Cheng Shao, Chia‐Hsin Wang, Shuwen Zhao, Hirofumi Ishii, Nozomu Hiraoka, Xiuyun Wang, Chih‐Wen Pao, Lili Han
Abstract
Abstract Exploring advanced electrolysis techniques for attaining scene‐adaptive and on‐site green H 2 production is an imperative matter of utmost practical significance but grand challenge remains. Herein, drawn inspiration from a spontaneous hydrazine‒H 2 O galvanic cell configured on a low‐valence Ru single atoms‐loaded Mo 2 C electrode (Ru SA /v‐Mo 2 C), an alternative H 2 energy solution utilizing self‐powered electrochemical hydrazine splitting (N 2 H 4 → 2H 2 + N 2 ) instead of the stereotyped electricity‐consumed water splitting for green H 2 production is proposed. This solution highlights a pH‐decoupled hydrazine‒H 2 O primary battery with notable open‐circuit voltage of 1.37 V and energy density up to 358 Wh g N2H4 −1 , which powerfully propels an alkaline hydrazine splitting cell, leading to bilateral H 2 harvest with a remarkable rate of 18 mol h −1 m −2 , i.e., 403.2 L h −1 m −2 , setting a new record for the self‐sustaining electricity‐powered H 2 production systems. The success of Ru SA /v‐Mo 2 C for this solution is further decoded by tandem theoretical and in situ spectroscopic studies, cross‐verifying a Ru‒Mo dual‐site synergy in streamlining the overall energy barriers, thereby enhancing the kinetics of electrode reactions. This pioneering work, showcasing electrochemical H 2 production free from both external energy and feedstock inputs, opens up a new horizon on way of the ultimate H 2 energy solution.