Journal
CHEMICAL ENGINEERING JOURNAL
Volume 419, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129512
Keywords
Amorphous CoSx; NiFe-LDH nanosheets; Interfaces; Electron transfer; Bifunctional electrocatalysts
Categories
Funding
- National Natural Science Foundation of China [U1832152, 11805261]
- Ministry of Science and Technology, Taiwan [MOST 1082113M213006]
- CAS 'Light of West China Program (2020)
- Natural Science Foundation of Ningxia [2020AAC03115]
- China Postdoctoral Science Foundation [2020M680430]
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The study successfully utilized the self-standing 3D NiFe-LDH@CoSx/NF bifunctional electrocatalysts for efficient water splitting to produce hydrogen energy. The integration of CoSx with NiFe-LDH provided low overpotentials and stable performance for overall water splitting.
Electrocatalytical water splitting to produce hydrogen energy is a promising green technology to solve energy crisis and environmental issues. The development of highly efficient and low-cost electrocatalysts is crucial for mass hydrogen production from water splitting. We newly assemble the self-standing 3D NiFe-LDH@CoSx/NF bifunctional electrocatalysts, via the electrodeposition of amorphous CoSx on two-dimensional (2D) NiFe-LDH nanosheets which are supported by porous nickel foam (NF). The integration of HER-active electrocatalyst of CoSx with outstanding OER catalyst of NiFe-LDH guarantees the bifunctional electrocatalytic activity. Furthermore, the formation of the constructed interfaces between amorphous CoSx and NiFe-LDH nanosheets synergistically favors the electron transfer. Therefore, this novel NiFe-LDH@CoSx/NF hierarchical assembly needs ultralow overpotentials of 136 mV (for HER) and 206 mV (for OER) to afford the 10 mA cm(-2) current density in alkaline medium (1 M KOH). An electrolyzer based on the NiFe-LDH@CoSx/NF produces an extremely low cell voltage (1.537 V) and good durability. This study offers a promising strategy for facile fabrication of low-cost electrocatalysts which boost the electrocatalytic performance for overall water splitting.
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