Interfacial engineering for promoting charge transfer in MoS2/CoFeLDH heterostructure electrodes for overall water splitting

In order to enhance the kinetics of water electrolysis and reduce the cell voltage, the development of highly active and stable non-precious metal bifunctional catalysts is essential. In this study, self-supported heterostructures based on MoS2-CoFeLDH were synthesised as the cathode and anode elect...

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Published in:International journal of hydrogen energy 2024-01, Vol.49, p.897-906
Main Authors: Xu, Yang, Cheng, Jun, Ding, Liwei, Lv, Hongkun, Zhang, Kang, Hu, Annan, Yang, Xian, Sun, Weifu, Mao, Yuxiang
Format: Article
Language:English
Subjects:
CoFeLDH
Electrocatalysis
Heterointerfaces
MoS2
Overall water splitting
Self-supporting electrodes
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Summary:In order to enhance the kinetics of water electrolysis and reduce the cell voltage, the development of highly active and stable non-precious metal bifunctional catalysts is essential. In this study, self-supported heterostructures based on MoS2-CoFeLDH were synthesised as the cathode and anode electrocatalysts for overall water splitting in alkaline media. The strong coupling effect at the heterogeneous interfaces of MoS2 and CoFeLDH improved the hydrogen evolution reaction (HER) at the cathode. The strong electronegativity of CoFeLDH facilitated the adsorption of H protons, and MoS2 with strong electrical conductivity promoted the desorption of H2 molecules. The oxygen evolution reaction (OER) at the anode was also enhanced because the LDHs had strong adsorption properties for hydroxyl species, and MoS2 assisted the transfer of hydroxyl species. The MoS2-CoFeLDH showed low overpotentials of 100 mV for the HER and 216 mV for the OER at 10 mA/cm2. This bifunctional catalyst required a low voltage of 1.55 V for overall water splitting and remained stable for 48 h. Schematic of MoS2-CoFeLDH/NF heterostructure electrodes for overall water splitting. [Display omitted] •MoS2-CoFeLDH heterostructures were synthesised for overall water splitting.•The strong coupling effect at heterogeneous interfaces improved HER and OER.•The MoS2-CoFeLDH showed low overpotentials of 100 mV for HER and 216 mV for OER at 10 mA/cm2.•The MoS2-CoFeLDH only required a low voltage of 1.55 V at 10 mA/cm2.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2023.09.312