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Facile preparation of Ag_(2)S/KTa_(0.5)Nb_(0.5)O_(3) heterojunction for enhanced performance in catalytic nitrogen fixation via photocatalysis and piezo-photocatalysis

查看全文 作　　者：Lu [1]Chen;Junfeng [1]Wang;Xiaojing [1]Li;Jiayu [1]Zhang;Chunran [1]Zhao;Xin [2]Hu;Hongjun [3]Lin;Leihong [2]Zhao;Ying [2]Wu;Yiming [1,2]He 高影响力作者 机构地区：[1]Department of Materials Science and Engineering,Zhejiang Normal University,Yingbin Road 688,Jinhua,321004,China;[2]Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Institute of Physical Chemistry,Zhejiang Normal University,Yingbin Road 688,Jinhua,321004,China;[3]College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua,321004,China高影响力机构 出　　处：《Green Energy & Environment》索引2023年第8卷第6期,共14页高影响力期刊 基　　金：financially supported by National Natural Science Foundation of China (Grant No. 22172144);Nature Science Foundation of Zhejiang Province (Grant No. LY20B030004)。 摘　　要：In this work, a novel heterojunction composite Ag_(2)S/KTa_(x)Nb_(1-x)O_(3)was designed and synthesized through a combination of hydrothermal and precipitation procedures. The Ta/Nb ratio of the KTa_(x)Nb_(1-x)O_(3)and the Ag_(2)S content were optimized. The best 0.5% Ag_(2)S/KTa_(0.5)Nb_(0.5)O_(3)(KTN) sample presents an enhanced photocatalytic performance in ammonia synthesis than KTN and Ag_(2)S. Under simulated sunlight, the NH_(3)generation rate of 0.5% Ag_(2)S/KTN reaches 2.0 times that of pure KTN. Under visible light, the reaction rate ratio of the two catalysts is 6.0.XRD, XPS, and TEM analysis revealed that Ag2S was intimately decorated on the KTN nanocubes surface, which promoted the electron transfer between the two semiconductors. The band structure investigation indicated that the Ag_(2)S/KTN heterojunction established a type-Ⅱ band alignment with intimate contact, thus realizing the effective transfer and separation of photogenerated carriers. The change in charge separation was considered as the main reason for the enhanced photocatalytic performance. Interestingly, the Ag_(2)S/KTN composite exhibited higher NH3generation performance under the combined action of ultrasonic vibration and simulated sunlight. The enhanced piezo-photocatalytic performance can be ascribed that the piezoelectric effect of KTN improved the bulk separation of charge carriers in KTN. This study not only provides a potential catalyst for photocatalytic nitrogen fixation but also shows new ideas for the design of highly efficient catalysts via semiconductor modification and external field coupling. 关 键 词：Photocatalytic nitrogen fixation Ag_(2)S/KTa_(0.5)Nb_(0.5)O_(3) Type-II heterojunction Piezo-photocatalysis Charge separation
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