1. In-situ anchoring of Pt single atoms on CoFeLDH for efficient alkaline hydrogen evolution reaction.
- Author
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Xu, Yang, Cheng, Jun, Ding, Liwei, Lv, Hongkun, Zhang, Kang, Hou, Chenglong, Hu, Annan, and Yang, Xian
- Subjects
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ATOMS , *GREEN fuels , *LAYERED double hydroxides , *ACTIVATION energy , *DENSITY functional theory - Abstract
The development of active single-atom catalysts for the alkaline hydrogen evolution reaction (HER) offers a promising strategy for lowering the cost of green hydrogen. Pt single atoms were in-situ anchored on layered double hydroxide (CoFeLDH) nanosheets using CV scanning electrodeposition with an optimal 40 cycles. The HAADF-STEM analysis confirmed the monoatomic dispersion of Pt in the CoFeLDH-Pt 40cls catalyst, whereas XAFS showed that Pt was coordinated with four oxygens. Density functional theory calculation revealed a drop in the reaction energy barrier of the rate-limiting Volmer step during water splitting over the CoFeLDH-Pt 40cls catalyst from 2.28 to 1.78 eV. Additionally, the free energy for hydrogen desorption decreased from 1.52 to −0.02 eV. The CoFeLDH-Pt 40cls catalyst demonstrated excellent HER kinetics by achieving a −10 mA/cm2 current density at 45 mV overpotential. It also exhibited sustained high activity for around 100 h in stability studies. Synthesis of in-situ anchored Pt single atom catalyst CoFeLDH-Pt 40cls for alkaline HER. [Display omitted] • Pt single atoms were in-situ anchored on CoFeLDH nanosheets through electrodeposition for HER. • The CoFeLDH-Pt 40cls exhibited a low overpotential of 45 mV at 10 mA/cm2. • HAADF-STEM and XAFS confirmed the monoatomic Pt in CoFeLDH-Pt 40cls. • DFT calculations showed that Volmer step decreased from 2.28 eV to 1.78 eV. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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