Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 39, Pages 22597-22602Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta06360j
Keywords
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Funding
- National Natural Science Foundation of China [22071125, 22071126, 21571111]
- Key Research and Development Project of Shandong Province [2019GGX102006, ZR2020QB140]
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This study demonstrates the in situ growth of 2D Co-MOF nanosheet arrays on conductive substrates and their subsequent conversion into Ni@CoO@Co-MOF composites for electrocatalysis. The composites show excellent performance for HER and OER, surpassing most Co/CoO-based electrocatalysts. The two-electrode electrolyzer fabricated from the composites displays a low overpotential for overall water splitting.
The in situ growth of 2D metal-organic framework (MOF) nanosheet arrays on conductive substrates as self-supported electrodes is highly desirable but challenging. Herein, we demonstrate for the first time that the in situ growth of 2D Co-MOF nanosheet arrays on nickel foam can be achieved by a CoO nanowall template induced strategy ([Co(bimpy) (p-bdc) (H2O)](n), named Co-MOF, bimpy = 2,5-bis(1H-imidazol-1-yl)pyridine, p-H(2)bdc = p-benzene dicarboxylic acid). The subsequent pyrolysis treatment converts the 2D Co-MOF nanosheet arrays into Ni@CoO@Co-MOFC composites, which can be directly applied as a self-supported electrode for electrocatalysis. Remarkably, Ni@CoO@CoMOFC as a promising electrocatalyst exhibits an excellent electrocatalytic performance of 138 and 247 mV for the HER and OER at a current density of 10 mA cm(-2), which surpasses that of most reported Co/CoO-based electrocatalysts. More importantly, a two-electrode electrolyzer fabricated from Ni@CoO@CoMOFC displays a low overpotential of 1.61 V (eta(10)) toward overall water splitting. This study provides new insights into the development of 2D MOF nanosheet arrays and derived self-supported electrodes with high performance for overall water-splitting.
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