期刊
DALTON TRANSACTIONS
卷 50, 期 48, 页码 18155-18163出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt02904e
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A Fe-doped NiCo2O4/Ni3S4 heterogeneous electrocatalyst with excellent HER and OER performance has been synthesized in this study, allowing for overall water splitting in alkaline electrolyte.
For overall water splitting, a vital challenge is to design active sites at interfaces. Heterogeneous catalysts with enhanced mass/charge transfer and accelerated adsorption of intermediates have exhibited significantly enhanced activities. Herein, a Fe-doped NiCo2O4/Ni3S4 heterogeneous electrocatalyst is synthesized for the HER and OER. On account of the synergistic effect of heterostructures, Ni-O-S presents a low overpotential of 29.1 mV (10 mA cm(-2)), a relatively small Tafel slope of 53.3 mV dec(-1) for the HER, and 259 mV at a current density of 100 mA cm(-2) (33.1 mV dec(-1)) for the OER. What is more, Ni-O-S acts as a binder-free bi-functional electrode in an alkaline electrolyte for overall water splitting, exhibiting a cell voltage of 1.45 V (10 mA cm(-2)) with good stability. This work offers an efficient approach for designing stable and high-efficiency heterogeneous electrodes for overall water splitting.
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