Conversion of CO2 to formic acid by integrated all-solar-driven artificial photosynthetic system
| Autor: | Yidong Hou, Xu Lu, Zhengxin Ding, Liang Huang, Lan Xue, Jiwu Zhao, Zizhong Zhang, Xianzhi Fu, Zhenjie Niu, Rusheng Yuan, Jinlin Long |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photon Renewable Energy Sustainability and the Environment Formic acid Energy conversion efficiency Energy Engineering and Power Technology Artificial photosynthesis chemistry.chemical_compound Chemical engineering chemistry Yield (chemistry) Quantum efficiency Density functional theory Electrical and Electronic Engineering Physical and Theoretical Chemistry Selectivity |
| Zdroj: | Journal of Power Sources. 512:230532 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2021.230532 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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