Cobalt nitride as a novel cocatalyst to boost photocatalytic CO2 reduction. (January 2021)

• Record Type: Journal Article
• Authors: Di, Jun; Chen, Chao; Zhu, Chao; Song, Pin; Duan, Meilin; Xiong, Jun; Long, Ran; Xu, Manzhang; Kang, Lixing; Guo, Shasha; Chen, Shuangming; Chen, Hailong; Chi, Zhen; Weng, Yu-Xiang; Li, Huaming; Song, Li; Wu, Minghong; Yan, Qingyu; Li, Shuzhou; Liu, Zheng
• Is Part Of: Nano energy. Volume 79(2021)
• Publication Date: 2021-01
• Subjects: Co2N -- BiOBr -- Cocatalyst -- Photocatalytic CO2 reduction -- Charge separation; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2020.105429
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Photocatalytic CO2 reduction has been regarded as an appealing pathway for CO2 conversion to hydrocarbon fuels. To boost the CO2 photoreduction performance, developing suitable cocatalyst on the photocatalysts is an efficient strategy. Herein, Co2 N is employed as novel noble-metal-free cocatalyst to promote the CO2 photoreduction performance of BiOBr ultrathin nanosheets. The optimal Co2 N/BiOBr delivers a high selectivity CO formation rate of 67.8 µmol g −1 h −1 in pure water without sacrificial reagent or extra photosensitizer, roughly 6 times higher than BiOBr. Co2 N can create strong electronic interactions with BiOBr, steering the electron transfer from BiOBr, across the interface to metallic Co2 N and finally to the surface. Apart from the charge separation steering, the activation energy barrier can be lowered on Co2 N surface via stabilize COOH* intermediates, tuning the rate-limiting step from the formation of COOH* on BiOBr to the formation of CO* on Co2 N, jointly optimize the CO2 photoreduction activity. This strategy affords an accessible pathway for designing cocatalysts for efficient CO2 photoreduction. Graphical Abstract: ga1 Highlights: Co2 N is developed as novel noble-metal-free cocatalyst to boost CO2 photoreduction. Strong electronic interactions can be built to steering the electron transfer from BiOBr to Co2 N. Co2 N can stabilize COOH* intermediates and change the rate-limiting step during CO2 reduction.