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Zhou C, Zhang G, Guo P, Ye C, Chen Z, Ma Z, Zhang M, Li J. Enhancing photoelectrochemical CO 2 reduction with silicon photonic crystals. Front Chem 2023; 11:1326349. [PMID: 38169620 PMCID: PMC10758474 DOI: 10.3389/fchem.2023.1326349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 12/08/2023] [Indexed: 01/05/2024] Open
Abstract
The effectiveness of silicon (Si) and silicon-based materials in catalyzing photoelectrochemistry (PEC) CO2 reduction is limited by poor visible light absorption. In this study, we prepared two-dimensional (2D) silicon-based photonic crystals (SiPCs) with circular dielectric pillars arranged in a square array to amplify the absorption of light within the wavelength of approximately 450 nm. By investigating five sets of n + p SiPCs with varying dielectric pillar sizes and periodicity while maintaining consistent filling ratios, our findings showed improved photocurrent densities and a notable shift in product selectivity towards CH4 (around 25% Faradaic Efficiency). Additionally, we integrated platinum nanoparticles, which further enhanced the photocurrent without impacting the enhanced light absorption effect of SiPCs. These results not only validate the crucial role of SiPCs in enhancing light absorption and improving PEC performance but also suggest a promising approach towards efficient and selective PEC CO2 reduction.
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Affiliation(s)
- Chu Zhou
- School of Engineering, University of Warwick, Coventry, United Kingdom
- Zhejiang Xinke Semiconductor Co., Ltd., Hangzhou, Zhejiang, China
| | - Gaotian Zhang
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, China
| | - Peiyuan Guo
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, China
| | - Chenxi Ye
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, China
| | - Zhenjun Chen
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, China
| | - Ziyi Ma
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, China
| | - Menglong Zhang
- Zhejiang Xinke Semiconductor Co., Ltd., Hangzhou, Zhejiang, China
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, China
| | - Jingbo Li
- College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, China
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