史彦涛

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:清华大学

学位:博士

所在单位:化学学院

学科:物理化学. 材料物理与化学. 无机化学

办公地点:西部校区化工综合楼C313

联系方式:0411-84986237

电子邮箱:shiyantao@dlut.edu.cn

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Interlaced W18O49 nanofibers as a superior catalyst for the counter electrode of highly efficient dye-sensitized solar cells

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论文类型:期刊论文

发表时间:2014-03-28

发表刊物:JOURNAL OF MATERIALS CHEMISTRY A

收录刊物:SCIE、EI、Scopus

卷号:2

期号:12

页面范围:4347-4354

ISSN号:2050-7488

摘要:Sufficient contact, high catalytic activity, free electron transport and ionic diffusion are desired for liquid-solid heterogeneous electrocatalysis. However, preparing catalysts that simultaneously possess all of these four advantages has proven challenging. Nanostructures originating from anisotropic growth always exhibit specific structural advantages and unique physical, chemical or catalytic properties. Herein, via a facile and template-free solvothermal approach, we synthesized W18O49 nanofibers (NFs) and nanofiber bundles (NFBs), as well as hierarchical spheres (HSs). As catalyst for the counter electrode (CE) of dye-sensitized solar cells (DSCs), W18O49 NFs demonstrated remarkable electrocatalytic activity because: (i) abundant oxygen vacancies offered sufficient active sites for reduction of I-3 into I; (ii) the one dimensional NFs were more beneficial to electron transport; (iii) the two phases, the liquid electrolyte and the solid NFs, could fully contact each other, and meanwhile ions could diffuse freely among the networks constructed by the interlaced NFs. Notably, DSCs using the NF-based semitransparent CE achieved high photoelectric conversion efficiencies (PCEs) up to 8.58%, superior to those based on NFBs or HSs, and comparable to that of 8.78% using Pt as the CE. Furthermore, it was proven that both the electrolytic activity and the PCE deteriorated drastically when the NFs were destroyed. Our work here will be of great interest for both fundamental research and practical applications of W18O49 nanomaterials in other fields.