Morphology control of Ni(OH)2-TiO2 nanosheet array and its excellent electrochemical hydrogen evolution performance

IF 3.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Molecular Catalysis Pub Date : 2025-03-23 DOI:10.1016/j.mcat.2025.115042

Fen Qiao, Changshun Zheng, Jikang Zhao, Jiaxin Zhou, Genxiang Wang

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Abstract

Aiming at the kinetic bottleneck of hydrogen evolution reaction in hydrogen production by electrolysis of water, Ni(OH)₂-TiO₂ composites were successfully prepared on nickel foam (NF) substrate by two-step hydrothermal method. By adjusting the concentration of nickel source and reaction conditions, the composite catalysts with excellent morphology and structure were constructed. The Ni(OH)₂-TiO₂ catalyst prepared under the optimized conditions has an overpotential of only 63 mV at the current density of 10 mA·cm⁻², showing lower Tafel slope, higher double layer capacitance and excellent reaction kinetics. The results of density functional theory (DFT) revealed the phenomenon of charge transfer inside the composite and the influence of interface effect on the electron structure, and further confirmed that the electrons transfer from Ni(OH)₂ to TiO₂ optimized the charge distribution inside the composite, promoted the charge transfer at the interface, and reduced the activation energy of catalytic reaction.

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来源期刊

Molecular Catalysis Chemical Engineering-Process Chemistry and Technology

CiteScore

6.90

自引率

10.90%

发文量

700

审稿时长

40 days

期刊介绍： Molecular Catalysis publishes full papers that are original, rigorous, and scholarly contributions examining the molecular and atomic aspects of catalytic activation and reaction mechanisms. The fields covered are: Heterogeneous catalysis including immobilized molecular catalysts Homogeneous catalysis including organocatalysis, organometallic catalysis and biocatalysis Photo- and electrochemistry Theoretical aspects of catalysis analyzed by computational methods