甲酸
人工光合作用
能量转换效率
太阳能燃料
选择性
化学
光伏系统
太阳能
能量转换
光化学
材料科学
化学工程
催化作用
纳米技术
光催化
光电子学
有机化学
物理
生物
热力学
工程类
生态学
作者
Jiwu Zhao,Lan Xue,Zhenjie Niu,Liang Huang,Yidong Hou,Zizhong Zhang,Rusheng Yuan,Zhengxin Ding,Xianzhi Fu,Lu Xu,Jinlin Long
标识
DOI:10.1016/j.jpowsour.2021.230532
摘要
Sunlight-driven valorization of CO2 into fuels is a promising solution to renewable energy storage, but the design of an integrated and efficient solar-to-chemical conversion system remains challenging. Herein, an all-solar-driven artificial photosynthetic system (APS) by tailoring photovoltaic-photoelectrochemical cell which can efficiently produce formic acid fuel from CO2 and H2O with bias-free illumination is demonstrated. Guided by density functional theory (DFT) calculations, a BiOI–Bi (BOI–Bi) cathode catalyst is synthesized, which is highly selective for CO2 to HCOOH conversion, and coupled with a single crystalline argon-treated TiO2 (TiO2-Ar) photoanode, whose valence band edge is beneficial for the oxidation of H2O to O2. The APS exhibits high product selectivity, robust activity and good durability. A solar-to-HCOOH selectivity of 96.5% is obtained with a HCOOH yield of 108.2 mmol g−1 h−1 under bias-free illumination of AM1.5G. The device can operate stably for at least 12 h. In particular, an apparent photon quantum efficiency of 7.5% and a solar-to-chemical conversion efficiency (ηSCC) of 8.3% are recorded, rivaling all the incumbent precious-metal-free all-solar-driven components for CO2-to-HCOOH conversion. This study highlights the potential of BOI-Bi for CO2 to HCOOH conversion with high selectivity and its integration into APS system to realize carbon-negative solar-to-chemical conversion with industrial relevance.
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