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Cooperation of oxygen vacancies and 2D ultrathin structure promoting CO2 photoreduction performance of Bi4Ti3O12

Science Bulletin 2020年第11期65卷 934-943,M0004页

作者： Lizhen Liu Hongwei Huang Fang Chen Hongjian Yu Na Tian Yihe Zhang Tierui Zhang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Reduction of CO2to solar fuels by artificial photosynthesis technology has attracted considerable attention. However, insufficient separation of charge carriers and weak CO2adsorption hamper the photocatalytic CO2 reduction activity. Herein, we tackle these challenges by introducing oxygen vacancies (OVs) on the two-dimensional Bi4Ti3O12ultrathin nanosheets via a combined hydrothermal and postreduction process. Selective photodeposition experiment of Pt over Bi4Ti3O12discloses that the ultrathin structure shortens the migration distance of photo-induced electrons from bulk to the surface, benefiting the fast participation in the CO2reduction reaction. The introduction of OVs on ultrathin Bi4Ti3O12 nanosheets leads to enormous amelioration on surface state and electronic structure, thereby resulting in enhanced CO2adsorption, photoabsorption and charge separation efficiency. The photocatalytic experiments uncover that ultrathin Bi4Ti3O12nanosheets with OVs reveal a largely enhanced CO2photoreduction activity for producing CO with a rate of 11.7 lmol g-1h-1in the gas–solid system, 3.2 times higher than that of bulk Bi4Ti3O12. This work not only yields efficient ultrathin photocatalysts with OVs, but also furthers our understanding on enhancing CO2reduction via cooperative tactics.

关键词： CO2 photoreduction Oxygen vacancies Ultrathin nanosheets Charge separation Bismuth titanate

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solar-harvesting lead halide perovskite for artificial photosynthesis

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Journal of Energy chemistry 2021年第11期30卷 11-26,I0001页

作者： Sunje Lee Gyu Yong Jang Jung Kyu Kim Jong Hyeok Park department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea School of Chemical Engineering Sungkyunkwan University(SKKU)2066 Seobu‐roJangan‐guSuwon 16419Republic of Korea

Facing the upcoming energy and environmental crisis, artificial photosynthesis for producing various solar fuels (e.g., hydrogen or carbon products) via a solar-to-chemical energy conversion is receiving increasing attention;however, its low conversion efficiency is a challenge for commercialization. To resolve low-efficiency issues, lead halide perovskite (LHP) with outstanding optoelectronic properties compared to conventional semiconductors can be a promising approach to improve the solar-to-fuel conversion reactions and solar fuel production efficiency. The tunable energy band structure and charge transport properties of LHP have promoted their extensive use in the production of solar fuels. This study summarizes the recent advancements of LHP-mediated solar-to-fuel conversions, classified by their redox reactions, namely solar water splitting, hydrohalic acid splitting, and CO_(2) reduction. Advanced approaches for achieving high conversion efficiency and long-term durability are discussed, including the configuration of devices, the composition of LHP, and the protection strategy of LHP. Moreover, the reaction mechanisms of LHP-mediated solar-to-chemical energy conversions and obstacles for enhancing the conversion efficiency are discussed. Finally, we present the perspectives on the development of LHP-incorporated solar-to-fuel conversion systems, which might open a new era of energy harvesting and storage.

关键词： Perovskite Photocatalytic reaction Photoelectrochemistry Photovoltaic Water splitting HI splitting CO_(2)reduction

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Electronic/Ionic Conducting Bipolar Membranes for solar Fuel Production under pH Gradients

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材料科学与工程（中英文B版） 2022年第1期12卷 1-15页

作者： Ibtehaj Alshdoukhi Michael Freund Steen Holdcroft Basic Sciences department King Saud bin Abdulaziz University for Health SciencesRiyadhSaudi Arabia department of Electrical and Computer Engineering Dalhousie UniversityHalifaxNova ScotiaCanada department of chemistry Simon Fraser UniversityBurnabyCanada

The components required for artificial photosynthesis including light absorbers and catalysts are being developed at a rapid *** many cases,the anodic and cathodic reactions driven with these systems are optimized for significantly different pH conditions,raising the issue of how they can be made *** work from our group has shown that large pH gradients can be maintained during electrolysis using BPM(bipolar membrane)and that electronic/ionic membranes can be used to couple the two half reactions without the use of external wiring and reducing the ohmic drop in the *** study investigates the properties of composite BPMs designed for artificial photosynthetic devices that require half reactions to operate under different pH *** of performance as a function of the nature of the composites and methods of creating BPMs are detailed.

关键词： artificial photosynthetic system design manufacture membranes solar fuel devices

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Semiconductor,molecular and hybrid systems for photoelectrochemical solar fuel production

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Journal of Energy chemistry 2017年第2期26卷 219-240页

作者： Rosalba Passalacqua Siglinda Perathoner Gabriele Centi department of Chemical BiologicalPharmaceutical and Environmental SciencesUniversity of MessinaV.le F.Stagno d’Alcontres 3198166 MessinaItaly department of Mathematics and Computational Sciences Physical Sciences and Earth SciencesUniversity of MessinaV.le F.Stagno d’Alcontres 3198166 MessinaItaly CASPE(INSTM Laboratory of Catalysis for Sustainable Production&Energy)/ERIC aisbl(European Research Institute of Catalysis) University of MessinaV.le F.Stagno d’Alcontres 3198166 MessinaItaly

The paper shortly reviews the basic direct approaches applied in searching for viable solutions to solar fuel production. These are generally distinguished in molecular and semiconductor(non-molecular)systems, however, hybrid strategies, proposed recently, have also been included. The most promising efforts are considered, highlighting key aspects and emerging critical issues. Special attention is paid to aspects such as electrode architecture, device design, and main differences in the scientific vision and challenges to directly produce solar fuels. This overview could be useful to orientate the readers in the wide panorama of research activities concerning water splitting, natural and artificial photosynthesis, and solar fuel production through the identification of common aspects, specialties and potentialities of the many initiatives and approaches that are developing worldwide in this field with the final aim to meet world energy demand.

关键词： solar fuels production CO2 reduction artificial photosynthesis PEC cells Semiconductor systems Molecular systems Hybrid nanobiocatalytic systems

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Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO_2 to solar fuel

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Science China Materials 2014年第1期57卷 70-100页

作者：李鑫温九青刘敬祥方岳平余家国 State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology College of Science South China Agricultural University department of Physics Faculty of Science King Abdulaziz University

The shortage of fossil fuels and the disastrous pollution of the environment have led to an increasing interest in artificial photosynthesis. The photocatalytic conversion of CO2 into solar fuel is believed to be one of the best methods to overcome both the energy crisis and environmental problems. It is of significant importance to efficiently manage the surface reactions and the photo-generated charge carriers to maximize the activity and selectivity of semiconductor photocatalysts for photoconversion of CO2 and H2 O to solar fuel. To date, a variety of strategies have been developed to boost their photocatalytic activity and selectivity for CO2 photoreduction. Based on the analysis of limited factors in improving the photocatalytic efficiency and selectivity, this review attempts to summarize these strategies and their corresponding design principles, including increased visible-light excitation, promoted charge transfer and separation, enhanced adsorption and activation of CO2, accelerated CO2 reduction kinetics and suppressed undesirable reaction. Furthermore, we not only provide a summary of the recent progress in the rational design and fabrication of highly active and selective photocatalysts for the photoreduction of CO2, but also offer some fundamental insights into designing highly efficient photocatalysts for water splitting or pollutant degradation.

关键词： CO2 二氧化碳光催化剂 Ti

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