4.7 Article

Synergistic effect between 1D Co3S4/MoS2 heterostructures to boost the performance for alkaline overall water splitting

期刊

INORGANIC CHEMISTRY FRONTIERS
卷 9, 期 10, 页码 2139-2149

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qi01646f

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资金

  1. National Natural Science Foundation of China [21805050]
  2. Fundamental Research Funds for the Central Universities [21620329]
  3. Postdoctoral Research Foundation of China [2020M673071]
  4. Natural Science Foundation of Guangdong Province [B6211050]
  5. Science and Technology Planning Project of Guangzhou, China [201605030008, 202002030142]
  6. National Innovation and Entrepreneurship Training Program for Undergraduate [202110559044]

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The rational design and synthesis of 1D Co3S4/MoS2 bimetallic sulfide nanorods show excellent performance for the hydrogen/oxygen evolution reaction. The introduction of Co3S4 is found to enhance water dissociation during the HER process according to density functional theory, offering new insights for preparing high-performance electrolyzers.
The reasonable design and construction of hetero-bimetal sulfides with high performance for the oxygen/hydrogen evolution reaction (O/HER) in an alkaline electrolyte are promising but still challenging. Herein, 1D Co3S4/MoS2 bimetallic sulfide nanorods (Co3S4/MoS2 NRs) were prepared using MoO3 nanorods and ZIF-67 as the precursors. As-prepared Co3S4/MoS2 NRs showed excellent HER and OER activity, including low overpotentials at 10 mA cm(-2) (116 and 280 mV) and Tafel slopes (59 and 52 mV dec(-1)). Furthermore, the density functional theory (DFT) reveals that the introduction of Co3S4 is conducive to reducing H2O dissociation during the HER process. In addition, Co3S4 also can effectively regulate the d orbital electrons of Mo in MoS2, which is beneficial for optimizing the H adsorption energy, thus enhancing the HER performance. Benefitting from excellent OER and HER activities, the Co3S4/MoS2 NR based-electrolyzer for overall water spitting exhibits a low cell voltage of 1.66 V to reach 20 mA cm(-2) along with good stability.

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