期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 630, 期 -, 页码 888-899出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.10.152
关键词
Hydrogen evolution reaction; Hydrazine oxidation reaction; Bifunctional electrocatalyst; ZIF67; Cobalt nickel selenides
By employing hydrazine oxidation reaction (HzOR) instead of oxygen evolution reaction (OER), energy-saving hydrogen generation can be realized. Here, a combined experimental and theoretical investigation of zeolitic imidazolate framework-67 coupling with CoNiSe-3 (ZIF67@CoNiSe-3) as an efficient electrocatalyst towards both hydrogen evolution reaction (HER) and HzOR is introduced. The as-prepared ZIF67@CoNiSe-3 with nanoflower structure and highly porous ultrathin nanosheet arrays endow advanced electrocatalytic properties for HER and HzOR.
Employing hydrazine oxidation reaction (HzOR) to substitute oxygen evolution reaction (OER) has been regarded as a promising alternative to realize energy-saving hydrogen generation during water splitting. Herein, we introduce a combined experimental and theoretical investigation of zeolitic imidazolate framework-67 coupling with CoNiSe-3 (ZIF67@CoNiSe-3) as an efficient electrocatalyst towards both hydrogen evolution reaction (HER) and HzOR. The as-prepared ZIF67@CoNiSe-3 with nanoflower struc-ture and highly porous ultrathin nanosheet arrays can endow advanced electrocatalytic properties for HER and HzOR. For instance, ZIF67@CoNiSe-3 demands a low overpotential of 49 mV to generate 10 mA center dot cm-2 with a small Tafel slope of 41.4 mV center dot dec-1 for HER, while it can also reach an ultrahigh current density of 400 mA cm-2 at 0.13 V vs reversible hydrogen electrode (RHE) with a small Tafel slope of 44.3 mV center dot dec-1 for HzOR. When using ZIF67@CoNiSe-3 as both cathode and anode in a two-electrode cell for overall hydrazine splitting (OHzS), it only needs an ultralow cell voltage of 0.45 V to produce 100 mA center dot cm-2 with a remarkable long-term stability of 30 h. Impressively, first-principles calculations (DFT) have been employed to investigate the electrocatalytic mechanisms of ZIF67@CoNi-3 for HER and HzOR. This research could provide an efficient strategy for energy-saving H2 production during water splitting by incorporating a low-cost yet high-performance bifunctional catalyst.(c) 2022 Elsevier Inc. All rights reserved.
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