Ni/NiO hybrid nanostructure supported on biomass carbon for visible-light photocatalytic hydrogen evolution

Well-dispersed Ni-based nanocrystals with Ni/NiO hybrid nanostructure are built on cellulose-derived carbon (Ni-C-500), which exhibits outstanding photocatalytic performance in the hydrogen evolution from water. Control experiments confirm that the optimal nickel content in Ni-C-500 is 16 wt% and th...

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Bibliographic Details
Published in:Journal of materials science 2021-08, Vol.56 (22), p.12775-12788
Main Authors: Xie, Kaihong, Guo, Peijing, Xiong, Zhangyi, Sun, Sufang, Wang, Haijun, Gao, Yongjun
Format: Article
Language:English
Subjects:
Adsorption
Biomass
Carbon
Cellulose
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Density functional theory
Density functionals
Electron recombination
Electrons
Energy Materials
Hydrogen
Hydrogen evolution
Materials Science
Nanocrystals
Nanostructure
Nickel
Nickel oxides
Optimization
Photocatalysis
Polymer Sciences
Solid Mechanics
Triethanolamine
Water chemistry
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Summary:Well-dispersed Ni-based nanocrystals with Ni/NiO hybrid nanostructure are built on cellulose-derived carbon (Ni-C-500), which exhibits outstanding photocatalytic performance in the hydrogen evolution from water. Control experiments confirm that the optimal nickel content in Ni-C-500 is 16 wt% and the optimum calcination temperature is 500 °C. The hydrogen evolution rate on Ni-C-500 in the presence of Eosin Y and triethanolamine (TEOA) reaches 13.5 mmol/g cat /h in the first hour, which is even higher than that on commercial Pt/C catalyst (11.4 mmol/g cat /h). The carbon support facilitates the transfer of photogenerated electrons from photosensitizer to Ni-based nanocrystals, efficiently preventing the recombination of photogenerated electrons and holes during the photocatalytic procedure. Density functional theory (DFT) calculations further demonstrate that the NiO islands on Ni(111) surface facilitate the adsorption of water molecules because of the interaction between the oxygen atom of NiO island and the hydrogen atom of water. Furthermore, produced H ad around NiO island of Ni(111) surface is more easily to form hydrogen on Ni/NiO hybrid nanostructure than on clean Ni(111) surface. Graphical abstract Ni/NiO hybrid nanostructure supported on biomass carbon for visible-light photocatalytic hydrogen evolution
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-021-06129-0