Significantly Stabilizing Hydrogen Evolution Reaction Induced by Nb‐Doping Pt/Co(OH)2 Nanosheets

High stability and efficiency of electrocatalysts are crucial for hydrogen evolution reaction (HER) toward water splitting in an alkaline media. Herein, a novel nano‐Pt/Nb‐doped Co(OH)2 (Pt/NbCo(OH)2) nanosheet is designed and synthesized using water‐bath treatment and solvothermal reduction approa...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-05, Vol.19 (20), p.e2207569-n/a
Main Authors: Tian, Yakun, Wen, Ming, Huang, Aijian, Wu, Qingsheng, Wang, Zhiguo, Zhu, Quanjing, Zhou, Tao, Fu, Yongqing
Format: Article
Language:English
Subjects:
Adsorption
alkaline medium
Catalytic activity
Cobalt
Doping
electrocatalysis
Electrocatalysts
Free energy
hydrogen evolution reaction
Hydrogen evolution reactions
Nanosheets
Nanotechnology
Nb‐doping Co(OH) 2 nanosheets
Platinum
significantly stabilizing effect
Stability
Synthesis
Water splitting
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Summary:High stability and efficiency of electrocatalysts are crucial for hydrogen evolution reaction (HER) toward water splitting in an alkaline media. Herein, a novel nano‐Pt/Nb‐doped Co(OH)2 (Pt/NbCo(OH)2) nanosheet is designed and synthesized using water‐bath treatment and solvothermal reduction approaches. With nano‐Pt uniformly anchored onto NbCo(OH)2 nanosheet, the synthesized Pt/NbCo(OH)2 shows outstanding electrocatalytic performances for alkaline HER, achieving a high stability for at least 33 h, a high mass activity of 0.65 mA µg−1 Pt, and a good catalytic activity with a low overpotential of 112 mV at 10 mA cm−2. Both experimental and theoretical results prove that Nb‐doping significantly optimizes the hydrogen adsorption free energy to accelerate the Heyrovsky step for HER, and boosts the adsorption of H2O, which further enhances the water activation. This study provides a new design methodology for the Nb‐doped electrocatalysts in an alkaline HER field by facile and green way. A unique Pt/NbCo(OH)2 nanosheet, which is synthesized using the facile approaches, exhibits superior electrocatalytic hydrogen evolution reaction (HER) performance and stability. The high‐valence Nb5+ doping lowers the valence states of Co to improve the HER activity, enhances the adsorption of H2O to promote water activation and optimizes the hydrogen adsorption free energy to accelerate the Heyrovsky step.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202207569