FigsharePub Date : 2020-08-21DOI: 10.1021/acssensors.0c01044.s001
Bihong Zhang (5679320), Hao Wang (39217), Jiajia Xi (9017492), Faqiong Zhao (1689208), Baizhao Zeng (1689205)
{"title":"Novel Bi<sub>2+<i>x</i></sub>WO<sub>6</sub> p–n Homojunction Nanostructure: Preparation, Characterization,nand Application for a Self-Powered Cathodic Photoelectrochemical Immunosensor","authors":"Bihong Zhang (5679320), Hao Wang (39217), Jiajia Xi (9017492), Faqiong Zhao (1689208), Baizhao Zeng (1689205)","doi":"10.1021/acssensors.0c01044.s001","DOIUrl":"https://doi.org/10.1021/acssensors.0c01044.s001","url":null,"abstract":"Synthesizingnnovel cathodic photoactive materials with high photoelectrochemicaln(PEC) performance is urgently important for the development of photocathodicnsensors. Herein, a novel photocathode material, Bi self-doped Bi<sub>2</sub>WO<sub>6</sub> (<i>i.e.,</i> Bi<sub>2+<i>x</i></sub>WO<sub>6</sub>) p–n homojunction, is prepared <i>via</i> a simple ethylene glycol-assisted solvothermal reductionnfor the first time. Compared with pristine Bi<sub>2</sub>WO<sub>6</sub>, Bi<sub>2+<i>x</i></sub>WO<sub>6</sub> possesses a narrowernband gap and higher light harvesting ability. Among the synthesizednmaterials, Bi<sub>2.1</sub>WO<sub>6</sub> exhibits the highest photocurrentnresponse, which is 23 times that of pure Bi<sub>2</sub>WO<sub>6</sub> because of the synergistic effect of doped Bi and the p–nnhomojunction. The open circuit potential, “V-shaped”nMott–Schottky plot, linear sweep voltammetry curve, and transientnphotocurrent demonstrate the p–n homojunction characteristicsnof the material well. By using the Bi<sub>2+<i>x</i></sub>WO<sub>6</sub> p–n homojunction as the photocathode for sensingnand the plasmonic WO<sub>3</sub>/Au composite as the photoanode fornsignal amplification, a new self-powered membraneless PEC immunosensornis established for a highly sensitive detection of human epididymalnprotein 4. This study offers a new idea for designing novel photocatalystsnwith satisfactory performance, and the Bi<sub>2+<i>x</i></sub>WO<sub>6</sub> p–n homojunction is expected to act asna promising PEC platform for developing various self-powered biosensors.","PeriodicalId":521689,"journal":{"name":"Figshare","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147883984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}