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A brand-new 1D branched CuO nanowire arrays for efficient photoelectrochemical water reduction

Abstract

Developing high surface area nanostructured electrodes with fast charge separation is one of the main challenges for exploring cupric oxide (CuO) based photocathodes in solar-driven hydrogen production application. Here, a brand-new 1D branched CuO nanowire arrays have been achieved on fluorine-doped tin oxide coated glass (FTO) through two-step wet chemical redox reaction. X-ray diffraction patterns, Raman spectra and X-ray photoelectron spectroscopy confirm the phase pure characteristic of resulting branched CuO. Except for the enlarged surface area of this advanced functional structure as compared with 1D wire trunk, the charge injection and separation have also been improved by rationally controlling density of defect and size of branches. As a result, the optimized branched CuO exhibits the photocurrent as high as 3.6 mA•cm-2 under AM 1.5G (100 mW•cm-2) illumination and 3.0 mA•cm-2 under visible light (λ > 420 nm) at 0.2 V vs RHE in 0.5 M Na2SO4, 2.8 and 3.0 fold’s greater than 1D wire samples, respectively. In addition, the solution-processed approach established here seems quite favourable for large scale and low cost manufacturing.

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Publication details

The article was received on 24 Jul 2018, accepted on 13 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8DT03013H
Citation: Dalton Trans., 2018, Accepted Manuscript
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    A brand-new 1D branched CuO nanowire arrays for efficient photoelectrochemical water reduction

    D. Qin, S. Duan, Z. Zhang, Y. Geng, X. Yao, M. Kan, Y. Zhao, X. pan, X. Kang and C. Tao, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03013H

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