Imparting CO2 reduction selectivity to ZnGa2O4 photocatalysts by crystallization from hetero nano assembly of amorphous-like metal hydroxides

Imparting an enhanced CO2 reduction selectivity to ZnGa2O4 photocatalysts has been demonstrated by controlled crystallization from interdispersed nanoparticles of zinc and gallium hydroxides. The hydroxide precursor in which Zn(ii) and Ga(iii) are homogeneously interdispersed was prepared through an...

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Published inRSC advances Vol. 10; no. 14; pp. 8066 - 8073
Main Authors Takemoto, Masanori, Tokudome, Yasuaki, Kikkawa, Soichi, Teramura, Kentaro, Tanaka, Tsunehiro, Okada, Kenji, Murata, Hidenobu, Nakahira, Atsushi, Takahashi, Masahide
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 25.02.2020
The Royal Society of Chemistry
Subjects
Affinity
Basicity
Carbon dioxide
Chemistry
Crystallization
Gallium
Heat treatment
Hydroxides
Metal oxides
Nanoparticles
Organic chemistry
Photocatalysis
Photocatalysts
Selectivity
Sol-gel processes
Zinc
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Summary:Imparting an enhanced CO2 reduction selectivity to ZnGa2O4 photocatalysts has been demonstrated by controlled crystallization from interdispersed nanoparticles of zinc and gallium hydroxides. The hydroxide precursor in which Zn(ii) and Ga(iii) are homogeneously interdispersed was prepared through an epoxide-driven sol–gel reaction. ZnGa2O4 obtained by a heat-treatment exhibits a higher surface basicity and an enhanced affinity for CO2 molecules than previously-reported standard ZnGa2O4. The enhanced affinity for CO2 molecules of the resultant ZnGa2O4 leads to highly-selective CO evolution in CO2 photo-reduction with H2O reductants. The present scheme is promising to achieve desirable surface chemistry on metal oxide photocatalysts.
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ISSN:2046-2069
DOI:10.1039/d0ra00710b