Photo-induced self-catalysis of nano-Bi2MoO6 for solar energy harvesting and charge storage. Issue 62 (15th October 2020)

• Record Type: Journal Article
• Authors: Si, Jiangju; Guo, Changmeng; Liu, Haojie; Li, Weiwei; Guo, Xiaowei; Bai, Peidong; Liu, Yanghong; Chen, Gairong; Sun, Ningbo
• Is Part Of: RSC advances. Volume 10:Issue 62(2020)
• Page Start: 38033
• Page End: 38037
• Publication Date: 2020-10-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra07020c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Photo-induced self-catalytic redox reaction of nano Bi2 MoO6 for solar energy harvesting and pseudo-capacitance charge storage. Abstract : Efficient, sustainable, and integrated energy systems require the development of novel multifunctional materials to simultaneously achieve solar energy harvesting and charge storage. Bi-based oxysalt aurivillius phase materials are potential candidates due to their typical photovoltaic effect and their pseudo-capacitance charge storage behavior. Herein, we synthesized nano-Bi2 MoO6 as a material for both solar energy harvesting and charge storage due to its suitable band gap for absorption of visible light and its well-defined faradaic redox reaction from Bi metal to Bi 3+ . The irradiation of visible light significantly affected the electrochemical processes and the dynamics of the Bi2 MoO6 electrode. The photo-induced self-catalytic redox mechanism was carefully explored by adding sacrificial agents in photocatalysis reaction. In accordance with the rule of energy matching, the photo-generated holes oxidized the Bi metal to Bi 3+, and the corresponding peak current increased by 79.5% at a scanning rate of 50 mV s −1 . More importantly, the peak current retention rate remained higher than 92.5% during the entire 200 cycles. The photo-generated electrons facilitated a decrease of 184 mV in the overpotential of the reduction process. Furthermore, the irradiation of visible light also accelerated the ionic diffusion of the electrolyte. These investigations provide a unique perspective for the design and development of new multifunctional materials to synergistically realize solar energy harvesting and charge storage.