首页|Enhanced photocatalytic N2 fixation using KNbO3/Bi4O5Br2 type Ⅱ heterojunction
Enhanced photocatalytic N2 fixation using KNbO3/Bi4O5Br2 type Ⅱ heterojunction
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The fabrication of heterojunction catalysts is an effective strategy to enhance charge separation effi-ciency,thus boosting the performance of photocatalysts.This work presents the synthesis and investigation of a novel KNbO3/Bi4O5Br2 heterostructure catalyst for photo-catalytic N2-to-NH3 conversion under light illumination.While morphology analysis revealed KNbO3 microcubes embedded within Bi4O5Br2 nanosheets,the composite exhibited no significant improvement in specific surface area or optical property compared to Bi4O5Br2 due to the relatively wide band gap and low surface area of KNbO3.The main contribution lies in the enhanced separation efficiency of photogenerated electrons and holes.Besides,the band structure analysis suggests that KNbO3 and Bi4O5Br2 exhibit suitable band potentials to form a type Ⅱ heterojunction.Benefiting from the higher Fermi level of KNbO3 than Bi4O5Br2,the electron drift at the contact region thus occurs and leads to the formation of a built-in electric field with the direction from KNbO3 to Bi4O5Br2,accelerating electron migration and improving the operational efficiency of the photocatalysts.Consequently,the KNbO3/Bi4O5Br2 catalyst shows an increased photoac-tivity,achieving an NH3 generation rate 1.78 and 1.58 times those of KNbO3 and Bi4O5Br2,respectively.This work may offer valuable insights for the design and synthesis of heterojunction composite photocatalysts.
Lin Yue、Zhihao Zeng、Xujie Ren、Shude Yuan、Chuanqi Xia、Xin Hu、Leihong Zhao、Lvchao Zhuang、Yiming He
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Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,College of Chemistry and Materials Science,Zhejiang Normal University,Jinhua 321004,China
Department of Materials Science and Engineering,Zhejiang Normal University,Jinhua 321004,China
National Natural Science Foundation of ChinaKey Research and Development Program of Zhejiang Province
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