Photocatalysis is considered as one of the most promising technologies to generate renewable energy and degrade environmental pollutants.Tremendous efforts have been made to improve photocatalytic efficiency.Among these,tuning spin polarization and introducing an external magnetic field are con-sidered two promising strategies to boost photocatalytic performance.Herein this review highlights the recent breakthroughs through manipulating spin states and applying external magnetic fields for enhanc-ing photocatalytic reactions.The relevant characterization techniques and fundamental mechanisms are summarized.Spin polarization states of photocatalysts have received considerable attention due to their unique roles,including inhibiting the recombination of photoexcited carriers owing to spin orientation constraint,enhancing the reaction product selectivity,and reducing the reaction barriers via optimizing the absorption energy and binding strength.As for the effects of external magnetic field on photocatalytic performance,we mainly discuss the separation enhancement of photoinduced carriers under static and time-varying magnetic fields and the magneto-hydrodynamic effect of charged particles.Lastly,the nega-tive magnetoresistance effect is discussed due to the synergistic effects of the electron spin state and an external magnetic field.These discussions in this review may provide new insights into designing new semiconductors for boosting photocatalytic performance in internal and external magnetic fields.

Chengxiao Peng;Wenjuan Fan;Qian Li;Wenna Han;Xuefeng Chen;Guangbiao Zhang;Yuli Yan;Qinfen Gu;Chao Wang;Huarong Zhang;Peiyu Zhang

Institute for Computational Materials Science,School of Physics and Electronics,Henan University,Kaifeng 475004,China;International Joint Research Laboratory of New Energy Materials and Devices of Henan Province,Kaifeng 475004,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China;State Key Laboratory of Advanced Special Steels,Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Australian Synchrotron,ANSTO,800 Blackburn Rd,Clayton,3168,VIC,Australia

材料科学技术（英文版）

[1]Chengxiao Peng;Wenjuan Fan;Qian Li;Wenna Han;Xuefeng Chen;Guangbiao Zhang;Yuli Yan;Qinfen Gu;Chao Wang;Huarong Zhang;Peiyu Zhang-.Boosting photocatalytic activity through tuning electron spin states and external magnetic fields)[J].材料科学技术（英文版）,2022(20):208-220

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