Xiaowu Gao , Nan Li , Peize Li , Yan Wei , Qikang Huang , Kalsoom Akhtar , Esraa M. Bakhsh , Sher Bahadar Khan , Yan Shen , Mingkui Wang
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引用次数: 0
Abstract
Photoelectrochemical (PEC) reduction of CO2 is a promising strategy to convert CO2 into chemical fuels for alleviating environmental crisis. However, modulation of photo-electrocatalytic processes to obtain a desired performance remains challenges due to the complicated PEC kinetics for CO2 reduction. Herein, we present ZnTe/SnS2 type II heterojunction photo-catalyst that facilitates light absorption for PEC reduction of CO2 toward CO production with an improved selectivity and photo-stability compared to the pure ZnTe electrode. The study of charge transfer at the ZnTe/SnS2 heterojunction interface with density functional theory (DFT) calculation and scanning electrochemical microscopy (SECM) characterization reveals that the photo-generated charge by ZnTe can flow quickly through the ZnTe/SnS2 interface to participate CO2 reduction reaction driven by the built-in electric potential of the type II heterojunction. The ZnTe/SnS2 photocathode achieves a photocurrent density of 2.35 mA∙cm−2 and a CO faradic efficiency of 87 % at −1.78 V (vs. Fc+/Fc) under standard illumination in a CO2-saturated tetrabutylammonium hexafluorophosphate in acetonitrile electrolyte, and retains approximately 87 % of its initial photocurrent after one-hour of continuous illumination test. Consequently, a generation rate of 56.0 μM∙cm−2∙h−1 for CO can be obtained on this electrode.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.