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Anodic Hydrazine Oxidation Assists Energy‐Efficient Hydrogen Evolution over a Bifunctional Cobalt Perselenide Nanosheet Electrode

2018; Wiley; Volume: 57; Issue: 26 Linguagem: Inglês

10.1002/anie.201803543

1521-3773

Junye Zhang, Hongming Wang, Yifan Tian, Ya Yan, Qi Xue, Ting He, Hongfang Liu, Chundong Wang, Yu Chen, Bao Yu Xia,

Advanced Photocatalysis Techniques

Abstract Water electrolysis is a promising source of hydrogen; however, technological challenges remain. Intensive efforts have focused on developing highly efficient and earth‐abundant electrocatalysts for water splitting. An effective strategy is proposed, using a bifunctional tubular cobalt perselenide nanosheet electrode, in which the sluggish oxygen evolution reaction is substituted with anodic hydrazine oxidation so as to assist energy‐efficient hydrogen production. Specifically, this electrode produces a current density of 10 mA cm −2 at −84 mV for hydrogen evolution and −17 mV for hydrazine oxidation in 1.0 m KOH and 0.5 m hydrazine electrolyte. An ultralow cell voltage of only 164 mV is required to generate a current density of 10 mA cm −2 for 14 hours of stable water electrolysis.