期刊
CHEMICAL ENGINEERING JOURNAL
卷 414, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128818
关键词
Heterostructures; Bifunctional electrocatalyst; Hydrogen evolution reaction; Hydrazine oxidation reaction; Overall hydrazine splitting
资金
- National Natural Science Foundation of China [21601174]
- Recruitment Program of Global Experts
- Fundamental Research Funds for the Central Universities [WK2060190081]
This study presents a hierarchical multi-component nanosheet arrays catalyst grown on nickel foam, which enables efficient hydrazine oxidation reaction and hydrogen evolution reaction at low working potentials with good durability. The two-electrode system based on this catalyst exhibits high current density and low cell voltage for overall hydrazine splitting.
Using hydrazine oxidation reaction (HzOR) to replace sluggish oxygen evolution could be an effective strategy to realize energy-saving hydrogen production, while the development of efficient bifunctional electrocatalysts still remains a significant challenge. Herein, we report a hierarchical multi-component nanosheet arrays grown on Ni foam composed of abundant NiCo/MoNi4 heterostructure interfaces on the amorphous MoOx substrate (denoted as NiCo-MoNi4 HMNAs/NF), which can simultaneously achieve the current density of 10 mA cm-2 at a low working potential of -30 mV (vs. RHE) for HzOR and a small overpotential of 68 mV for HER. Importantly, the post-catalysis characterizations further disclose that the partial formation of transition metal hydroxide species probably endow favorable absorption for hydroxyl intermediates, leading to the high performance and durability. Moreover, a two-electrode system based on NiCo-MoNi4 HMNAs/NF can reach the current density of 250 mA cm-2 with a cell voltage of 0.63 V for overall hydrazine splitting (OHzS) system.
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