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- Title
Manipulating dehydrogenation kinetics through dual-doping Co3N electrode enables highly efficient hydrazine oxidation assisting self-powered H2 production.
- Authors
Liu, Yi; Zhang, Jihua; Li, Yapeng; Qian, Qizhu; Li, Ziyun; Zhu, Yin; Zhang, Genqiang
- Abstract
Replacing sluggish oxygen evolution reaction (OER) with hydrazine oxidation reaction (HzOR) to produce hydrogen has been considered as a more energy-efficient strategy than water splitting. However, the relatively high cell voltage in two-electrode system and the required external electric power hinder its scalable applications, especially in mobile devices. Herein, we report a bifunctional P, W co-doped Co3N nanowire array electrode with remarkable catalytic activity towards both HzOR (−55 mV at 10 mA cm−2) and hydrogen evolution reaction (HER, −41 mV at 10 mA cm−2). Inspiringly, a record low cell voltage of 28 mV is required to achieve 10 mA cm−2 in two-electrode system. DFT calculations decipher that the doping optimized H* adsorption/desorption and dehydrogenation kinetics could be the underlying mechanism. Importantly, a self-powered H2 production system by integrating a direct hydrazine fuel cell with a hydrazine splitting electrolyzer can achieve a decent rate of 1.25 mmol h−1 at room temperature. While facile hydrazine oxidation could replace the sluggish H2O oxidation reaction in renewable H2 production, few bifunctional catalysts exist. Here, authors explore a dual-doping strategy for Co3N nanowires that bestows bifunctionality toward both hydrazine oxidation and H2 evolution catalysis.
- Subjects
DEHYDROGENATION kinetics; HYDRAZINE; ELECTROCATALYSIS; OXYGEN evolution reactions; DEHYDROGENATION; HYDROGEN evolution reactions; OXIDATION
- Publication
Nature Communications, 2020, Vol 11, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-15563-8