Construction Of 1d/2d Core-Shell Structured K6nb10.8o30@Zn2in2s5 As S-Scheme Photocatalysts for Cocatalyst-Free Hydrogen Production

34 Pages Posted: 23 Dec 2022

See all articles by Jing Wang

Jing Wang

Nanjing Tech University

Runhui Pan

Nanjing Tech University

Shiye Yan

Nanjing Tech University

Rui Wang

Nanjing Tech University

Xingyu Niu

Nanjing Tech University

Qi Hao

Nanjing Tech University

Jilei Ye

Nanjing Tech University

Yuping Wu

Nanjing Tech University

Hui Ying Yang

Singapore University of Technology and Design (SUTD) - Pillar of Engineering Product Development

Abstract

Constructing heterostructures is an effective strategy to achieve efficient photocatalysis. The determination of the heterojunction types depends on the photo-induced charge carrier transfer path. Therefore, understanding the charge carrier transfer mechanism of heterojunctions plays an irreplaceable role in guiding the construction of rational heterojunctions. However, it is challenging due to the microscopic nature of charge carrier transfer. Herein, an S-scheme K6Nb10.8O30@Zn2In2S5 (KNbO@ZIS) heterojunction with 1D/2D core-shell structure is designed for improving photocatalytic hydrogen production. KNbO@ZIS exhibits a greatly improved cocatalyst-free hydrogen generation activity (12.35 mmol h-1 g-1) compared to K6Nb10.8O30 (KNbO) and Zn2In2S5 (ZIS) under UV-visible illumination. The improvement of photocatalytic performance is mainly attributed to the suppressed recombination of photogenerated charge carriers by the S-scheme heterojunction. The 1D/2D core-shell structure further accelerates the charge carrier transfer in the photocatalysts. S-scheme heterojunction mechanism is also demonstrated by ex/in situ irradiated X-ray photoelectron spectroscopy and Kelvin probe force microscopy measurements as well as work function calculations. This work provides a powerful strategy for designing novel heterojunction composites.

Keywords: S-scheme heterojunction, Zn2In2S5, K6Nb10.8O30, KPFM, in situ irradiated XPS, photocatalytic hydrogen production

Suggested Citation

Wang, Jing and Pan, Runhui and Yan, Shiye and Wang, Rui and Niu, Xingyu and Hao, Qi and Ye, Jilei and Wu, Yuping and Ying Yang, Hui, Construction Of 1d/2d Core-Shell Structured K6nb10.8o30@Zn2in2s5 As S-Scheme Photocatalysts for Cocatalyst-Free Hydrogen Production. Available at SSRN: https://ssrn.com/abstract=4310496 or http://dx.doi.org/10.2139/ssrn.4310496

Jing Wang (Contact Author)

Nanjing Tech University ( email )

Nanjing 211816
China

Runhui Pan

Nanjing Tech University ( email )

Nanjing 211816
China

Shiye Yan

Nanjing Tech University ( email )

Nanjing 211816
China

Rui Wang

Nanjing Tech University ( email )

Nanjing 211816
China

Xingyu Niu

Nanjing Tech University ( email )

Nanjing 211816
China

Qi Hao

Nanjing Tech University ( email )

Nanjing 211816
China

Jilei Ye

Nanjing Tech University ( email )

Nanjing 211816
China

Yuping Wu

Nanjing Tech University ( email )

Nanjing 211816
China

Hui Ying Yang

Singapore University of Technology and Design (SUTD) - Pillar of Engineering Product Development ( email )

487372
Singapore

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