Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide

IMR OpenIR

	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
发表期刊	ADVANCED FUNCTIONAL MATERIALS
ISSN	1616-301X
卷号	26 期号:25 页码:4445-4455
摘要	A 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.
部门归属	[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
关键词	Charge Separation Htcc Metallic Photocatalysts Moo2
学科领域	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
资助者	Shenzhen 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]
收录类别	sci
语种	英语
WOS记录号	WOS:000379905800002
引用统计	被引频次：162[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75798
专题	中国科学院金属研究所
通讯作者	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.
推荐引用方式 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.