Journal
ELECTROCHIMICA ACTA
Volume 435, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.141406
Keywords
Transition metal phosphide; Carbon matrix; Electrocatalysis; Hydrazine oxidation; Hydrogen production
Categories
Funding
- National Key R&D Program of China [2017YFA0700104]
- National Natural Science Foundation of China [21701124, 21911530255]
- Tianjin Municipal Science and Technology Commission [18JCQNJC71500, 17JCZDJC38000]
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry [2019-6]
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A CoNi-bimetal phosphide nanoparticles embedded P doped carbon matrix structure was successfully constructed for efficient hydrazine-assisted water splitting, providing a new technological pathway for energy-saving hydrogen production.
Electrochemical water splitting is considered as a sustainable and clean technology for hydrogen production, but is still limited by the sluggish kinetics of anodic oxygen evolution reaction (OER). Hydrazine oxidation reaction (HzOR) requires much lower thermodynamic oxidation potential and produces zero-carbon molecules, thus becoming a promising alternative to replace OER for realizing energy-saving hydrogen production. Herein, a CoNi-bimetal phosphide nanoparticles embedded P doped carbon matrix structure ((Co0.6Ni0.4)2P@PC) is con-structed via annealing a novel precursor composed of CoNi-bimetal sites and P contained ligands for hydrazine -assisted water splitting. The P element can simultaneously in situ phosphorize the metal sites and carbon atoms. The (Co0.6Ni0.4)2P@PC exhibits outstanding hydrogen evolution reaction (HER) performance with an over -potential of 67.9 mV at 10 mA cm-2 and requires an ultralow potential of-83 mV at 10 mA cm-2 for HzOR in alkaline electrolyte. Furthermore, the electrolyzer assembled with the (Co0.6Ni0.4)2P@PC as both cathode and anode delivers a cell voltage of merely 0.048 V which is much lower compared with the OER-HER system (1.60 V) for reaching 10 mA cm-2. The present work develops an eco-friendly synthetic method for designing low-cost and highly efficient carbon matrix incorporated phosphide electrocatalyst for energy-saving hydrogen production.
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