Photoelectrocatalytic generation of H2 and S from toxic H2S by using a novel BiOI/WO3 nanoflake array photoanode

doi:10.1007/s11708-021-0775-7

Front. Energy

2021, Vol. 15

Issue (3) : 744-751 https://doi.org/10.1007/s11708-021-0775-7

RESEARCH ARTICLE

Photoelectrocatalytic generation of H₂ and S from toxic H₂S by using a novel BiOI/WO₃ nanoflake array photoanode

Jing BAI¹, Bo ZHANG¹, Jinhua LI¹, Baoxue ZHOU²(

)

¹. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
². School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200090, China; Key Laboratory of Thin Film and Microfabrication Technology, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

In this paper, a photoelectrocatalytic (PEC) recovery of toxic H₂S into H₂ and S system was proposed using a novel bismuth oxyiodide (BiOI)/ tungsten trioxide (WO₃) nano-flake arrays (NFA) photoanode. The BiOI/WO₃ NFA with a vertically aligned nanostructure were uniformly prepared on the conductive substrate via transformation of tungstate following an impregnating hydroxylation of BiI₃. Compared to pure WO₃ NFA, the BiOI/WO₃ NFA promotes a significant increase of photocurrent by 200%. Owing to the excellent stability and photoactivity of the BiOI/WO₃ NFA photoanode and I^–/ $I 3 −$ catalytic system, the PEC system toward splitting of H₂S totally converted S^2– into S without any polysulfide ( $S x n −$ ) under solar-light irradiation. Moreover, H₂ was simultaneously generated at a rate of about 0.867 mL/(h·cm). The proposed PEC H₂S splitting system provides an efficient and sustainable route to recover H₂ and S.

Keywords bismuth oxyiodide (BiOI)/ tungsten trioxide (WO₃) nano-flake arrays (NFA) photoelectrocatalytic (PEC) H₂S splitting H₂ S

Corresponding Author(s): Baoxue ZHOU

Online First Date: 07 September 2021 Issue Date: 09 October 2021

Cite this article:

Jing BAI,Bo ZHANG,Jinhua LI, et al. Photoelectrocatalytic generation of H₂ and S from toxic H₂S by using a novel BiOI/WO₃ nanoflake array photoanode[J]. Front. Energy, 2021, 15(3): 744-751.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-021-0775-7
https://academic.hep.com.cn/fie/EN/Y2021/V15/I3/744

Fig.1 SEM images of WO₃ NFA and BiOI/WO₃ NFA.

Fig.2 XRD patterns of FTO, WO₃, BiOI, and BiOI/WO₃ electrode.

Fig.3 X-ray photoelectron spectroscopy survey scan for BiOI/WO₃ NFA.

Fig.4 UV-Vis absorption spectra.

Fig.5 Photo-response and energy bands of BiOI/WO₃NFA.

Fig.6 Photocurrent-time (I-t) curves of BiOI/WO₃ NFA with different concentrations of KI. (Condition: bias potential 0.6 V, 0.1 mol/L Na₂SO₄)

Fig.7 PEC splitting of H₂S for H₂ and S recovery.

Fig.8 Production of hydrogen and sulfur in a long-term operation.

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