Volume 18, Issue 20 2201882
Research Article

Steering the Pathway of Plasmon-Enhanced Photoelectrochemical CO2 Reduction by Bridging Si and Au Nanoparticles through a TiO2 Interlayer

Kang Wang

Kang Wang

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China

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Ningbo Fan

Ningbo Fan

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China

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Bin Xu

Bin Xu

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China

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Zhihe Wei

Zhihe Wei

Soochow Institute of Energy and Material Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 China

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Cong Chen

Cong Chen

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China

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Hao Xie

Hao Xie

Department of Physics, School of Science, Hainan University, Haikou, 570228 China

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Weixiang Ye

Corresponding Author

Weixiang Ye

Department of Physics, School of Science, Key Laboratory of Engineering Modeling and Statistical Computation of Hainan Province, Hainan University, Haikou, 570228 China

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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Yang Peng

Corresponding Author

Yang Peng

Soochow Institute of Energy and Material Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 China

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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Mingrong Shen

Corresponding Author

Mingrong Shen

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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Ronglei Fan

Corresponding Author

Ronglei Fan

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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First published: 18 April 2022
Citations: 16

Abstract

Photoelectrochemical (PEC) conversion of CO2 in an aqueous medium into high-energy fuels is a creative strategy for storing solar energy and closing the anthropogenic carbon cycle. However, the rational design of catalytic architectures to selectively and efficiently produce a target product such as CO has remained a grand challenge. Herein, an efficient and selective Si photocathode for CO production is reported by utilizing a TiO2 interlayer to bridge the Au nanoparticles and n+p-Si. The TiO2 interlayer can not only effectively protect and passivate Si surface, but can also exhibit outstanding synergies with Au nanoparticles to greatly promote CO2 reduction kinetics for CO production through stabilizing the key reaction intermediates. Specifically, the TiO2 layer and Au nanoparticles work concertedly to enhance the separation of localized surface plasmon resonance generated hot carriers, contributing to the improved activity and selectivity for CO production by utilizing the hot electrons generated in Au nanoparticles during PEC CO2 reduction. The optimized Au/TiO2/n+p-Si photocathode exhibits a Faradaic efficiency of 86% and a partial current density of −5.52 mA cm−2 at −0.8 VRHE for CO production, which represent state-of-the-art performance in this field. Such a plasmon-enhanced strategy may pave the way for the development of high-performance PEC photocathodes for energy-efficient CO2 utilization.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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