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TEOA-induced in situ formation of wurtzite and zinc-blende CdS heterstructures as a high-active and long-lasting photocatalyst for converting CO2 into solar fuel

Abstract

The wurtzite and zinc-blende CdS heterostructures are designed and in situ synthesized by tuning triethanolamine (TEOA) usage in a mild hydrothermal condition. The as-prepared samples were systematically characterized by XRD, SEM, TEM, UV-vis DRS, XPS, PL, and Mott-Schottky. It is realized that a further increase in used amount of TEOA promote the CdS phase transformation from hexagonal wurtzite to cubic zinc-blende during hydrothermal process, and detailed investigations indicate that the heteronanoparticles possess explicit heterointerfaces and strong light absorption as well as tunable band gaps. Especially when used as photocatalyst toward reduction of CO2 to CO and CH4 in the presence of H2O, the heterostructured CdS hybrids display not only better photocatalytic CH4-/CO-producing activity under visible-light irradiation than that of isolated CdS phase, but also unprecedented cycling stability, without hardly deactivation over 100 h. The remarkable improvement of photoactivity and stability over CdS-based hybrid can be attributed to better electron-hole pair separation and migration owing to junctions formed by coexistence of wurtzite and zinc-blende in the CdS nanohybrids, according to the physicochemical characterization. Additionally, the role of the junctions endowed by wurtzite/zinc-blende CdS in the process of the CO2 photoreduction is evaluated by using transient photocurrents and electrochemical impedance spectra (EIS) analysis, illustrating its fast-interfacial charge transfer. This work would provide a significant avenue to effectively photocatalytic conversion CO2 using rationally designed CdS-based surface phase junctions engineering at nanoscale.

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Publication details

The article was received on 07 Feb 2018, accepted on 17 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8CY00274F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    TEOA-induced in situ formation of wurtzite and zinc-blende CdS heterstructures as a high-active and long-lasting photocatalyst for converting CO2 into solar fuel

    Y. Chai, J. Lu, L. Li, D. Li, M. Li and J. Liang, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00274F

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