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Issue 22, 2018
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A photo-responsive electrocatalyst: CdSe quantum dot sensitized WS2 nanosheets for hydrogen evolution in neutral solution

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Abstract

Combining photochemical and electrochemical energy conversion into a single catalytic system is an efficient method for energy generation. In this paper, to increase the electrocatalytic activity of 2H-WS2 nanosheets, CdSe quantum dots (QDs) are introduced as sensitizers to design a novel photo-responsive electrode. The electrocatalytic HER activity of the nanocomposites is observably enhanced under 300 W Xe lamp irradiation (λ ≥ 420 nm, the overpotential decreases from −1030 mV vs. RHE to −400 mV vs. RHE at a cathodic current density of 10 mA cm−2 in neutral electrolyte without adding any sacrificial agent, and the Tafel slope decreases from 132 mV dec−1 to 56 mV dec−1). Moreover, the photo-enhanced electrocatalyst demonstrates high stability, which is reflected by a steady-state performance for more than 24 h. This strategy may have potential use in designing and fabricating novel photo-assisted electrocatalysts.

Graphical abstract: A photo-responsive electrocatalyst: CdSe quantum dot sensitized WS2 nanosheets for hydrogen evolution in neutral solution

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Publication details

The article was received on 31 Jul 2018, accepted on 18 Sep 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ03810D
Citation: New J. Chem., 2018,42, 18021-18027
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    A photo-responsive electrocatalyst: CdSe quantum dot sensitized WS2 nanosheets for hydrogen evolution in neutral solution

    Y. Zhong, B. Chang, Y. Shao, Y. Wu and X. Hao, New J. Chem., 2018, 42, 18021
    DOI: 10.1039/C8NJ03810D

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