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Oxygen vacancy-rich MoO_(3)nanorods as photocatalysts for photo-assisted Li-O_(2) batteries

Journal of Advanced Ceramics 2023年第4期12卷 747-759页

作者： Guiru Sun Daming Yang Zexu Zhang Yan Wang Wei Lu Ming Feng Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China

photo-assisted lithium-oxygen(Li-O_(2))batteries have been developed as a new system to reduce a large overpotential in the Li-O_(2)batteries.However,constructing an optimized photocatalyst is still a challenge to achieve broad light absorption and a low recombined rate of photoexcited electrons and holes.Herein,oxygen vacancy-rich molybdenum trioxide(MoO_(3-x))nanorods are employed as photocatalysts to accelerate kinetics of cathode reactions in the photo-assisted Li-O_(2)batteries.Oxygen vacancies on the MoO_(3-x)nanorods can not only increase light-harvesting capability but also improve electrochemical activity for the cathode reactions.Under illumination,the photoexcited electrons and holes are effectively separated on the MoO_(3-x)nanorods.During discharging,activated O2 is reduced to Li_(2)O_(2)by the photoexcited electrons from the MoO_(3-x)nanorods.The photoexcited holes can promote the decomposition of Li_(2)O_(2)during subsequent charging.Accordingly,the photo-assisted Li-O_(2)batteries with the MoO_(3-x)nanorods deliver an ultralow overpotential of 0.22 V,considerable rate capability,and good reversibility.We think that this work could give a reference for the exploitation and application of the photocatalysts in the photo-assisted Li-O_(2)batteries.

关键词： molybdenum trioxide(MoO_(3))nanorods oxygen vacancy photocatalyst photo-assistance lithium-oxygen(Li-O_(2))batteries

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The applications of semiconductor materials in air batteries

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Chinese Chemical Letters 2021年第11期32卷 3277-3287页

作者： Yingjian Yu Sujuan Hu School of Physical Science and Technology Kunming UniversityKunming 650214China School of Chemistry and Chemical Engineering Kunming UniversityKunming 650214China

Air batteries are promising energy storage technologies that have gained continuous attraction due to their high energy densities.At present,investigations on anodes of air batteries are usually focused on various metals such as Li,Zn,Al.In contrast,the semiconductor anodes like Si and Ge are less investigated.Si-air battery possesses a high theoretical energy density and Ge-air battery has a high actual power density and ideal safety.Besides anodes,air cathodes where oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)are also the key components in air batteries.To further promote the discharging performance and facilitate energy conversion/storage,semiconductor materials have been introduced in electrochemical cells like Li-O_(2) and Zn-air batteries.This review briefly summarizes semiconductor materials utilized in various air batteries,including the progress of Si-air and Ge-air batteries and recent advances in semiconductor cathodes catalysts.Finally,the remaining challenges and further perspective are discussed.

关键词： Si-air battery Ge-air battery Li-O_(2)battery Zn-air battery Semiconductors Catalysts photo-assistance

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