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Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide
Hu, Zhuofeng; Liu, Gang; Chen, Xingqiu; Shen, Zhurui; Yu, Jimmy C.; Shen, ZR; Yu, JC (reprint author), Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China.; Shen, ZR (reprint author), Tianjin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Ceram & Machining Technol, Tianjin 300072, Peoples R China.; Yu, JC (reprint author), Chinese Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China.
2016-07-05
Source PublicationADVANCED FUNCTIONAL MATERIALS
ISSN1616-301X
Volume26Issue:25Pages:4445-4455
AbstractA new visible-light responsive metallic photocatalyst, nanostructured MoO2, has been discovered. The metallic nature of MoO2 is confirmed by valance X-ray photoelectron spectroscopy spectrum and theoretical calculations. However, MoO2 itself shows only moderate activity due to the serious charge recombination, a general disadvantage of metallic photocatalysts. The findings suggest that its effective charge diffusion length L-p is smaller than 1.0 nm while the separation efficiency (sep) is less than 10%. Therefore, only the periphery of the metallic MoO2 can effectively contribute to photocatalysis. This limitation is overcome by integrating MoO2 in a hydrothermal carbonation carbon (HTCC) matrix (mainly contains semiconductive polyfuran). This simple chemical modification brings two advantages: (i) an internal electric field is formed at the interface between MoO2 and HTCC due to their appropriate band alignment; (ii) the nanostructured MoO2 and the HTCC matrix are intertwined with each other intimately. Their small size and large contact area promote charge transfer, especially under the internal electric field. Therefore, the separation rate of photoexcited charge carrier in MoO2 is greatly enhanced. The activity increases by 2.4, 16.8, and 4.0 times in photocatalytic oxygen evolution, dyes degradation, and photoelectrochemicl cell, respectively. The new approach is helpful for further development of metallic photocatalysts.
description.department[hu, zhuofeng ; shen, zhurui ; yu, jimmy c.] chinese univ hong kong, dept chem, shatin, hong kong, peoples r china ; [shen, zhurui] tianjin univ, sch mat sci & engn, minist educ, key lab adv ceram & machining technol, tianjin 300072, peoples r china ; [liu, gang ; chen, xingqiu] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china ; [hu, zhuofeng ; shen, zhurui ; yu, jimmy c.] chinese univ hong kong, shenzhen res inst, shenzhen, peoples r china
KeywordCharge Separation Htcc Metallic Photocatalysts Moo2
Subject AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
Funding OrganizationShenzhen Basic Research Scheme [JCYJ20120619151417947]; Research Grants Council of the Hong Kong Special Administrative Region, China [T23-407/13-N, 14304315]; National Natural Science Foundation of China [21173179, 21303118]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/75798
Collection中国科学院金属研究所
Corresponding AuthorShen, ZR; Yu, JC (reprint author), Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China.; Shen, ZR (reprint author), Tianjin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Ceram & Machining Technol, Tianjin 300072, Peoples R China.; Yu, JC (reprint author), Chinese Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China.
Recommended Citation
GB/T 7714
Hu, Zhuofeng,Liu, Gang,Chen, Xingqiu,et al. Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide[J]. ADVANCED FUNCTIONAL MATERIALS,2016,26(25):4445-4455.
APA Hu, Zhuofeng.,Liu, Gang.,Chen, Xingqiu.,Shen, Zhurui.,Yu, Jimmy C..,...&Yu, JC .(2016).Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide.ADVANCED FUNCTIONAL MATERIALS,26(25),4445-4455.
MLA Hu, Zhuofeng,et al."Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide".ADVANCED FUNCTIONAL MATERIALS 26.25(2016):4445-4455.
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