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	Role of pt loading in the photocatalytic chemistry of methanol on rutile tio2(110)
	Hao, Qunqing1,2; Wang, Zhiqiang1,3; Wang, Tianjun1; Ren, Zefeng1; Zhou, Chuanyao1; Yang, Xueming1,4
刊名	Acs catalysis
	2019
卷号	9期号:1页码:286-294
关键词	Pt cocatalyst Titanium dioxide Hydrogen production Charge separation Methanol to methoxy conversion
ISSN号	2155-5435
DOI	10.1021/acscatal.8b03359
通讯作者	Zhou, chuanyao(chuanyaozhou@dicp.ac.cn) ; Yang, xueming(xmyang@dicp.ac.cn)
英文摘要	As a cocatalyst, pt is well-known for accepting photoexcited electrons and lowering the overpotential of hydrogen production in photocatalysis, being responsible for the enhanced photocatalytic efficiency. despite the above existing knowledge, the adsorption of reactants on the pt/photon-absorber (for example, pt/tio2) interface, a prerequisite to understand the photocatalytic chemistry, is extremely difficult to investigate mainly because of the complexity of the powdered material and solution environment. combining ultrahigh vacuum and well-ordered single crystals, we study the photocatalytic chemistry of methanol on pt-loaded rutile tio2(110) using temperature-programmed desorption (tpd) and ultraviolet photoelectron spectroscopy (ups). despite the same photocatalytic chemical products (i.e., formaldehyde and surface hydrogen species) as on pt-free tio2(110), the subsequent chemistry of surface hydrogen species and the photocatalytic reaction rate are much different. the bridging hydroxyls desorb as water molecules around 500 k on the pt-free tio2(110) surface, and by contrast, this desorption channel disappears completely and water and molecular hydrogen desorb at much lower temperature (<300 k) after pt deposition, which can prevent the recombination of hydrogen species with formaldehyde. more importantly, methanol dissociates into methoxy at the pt/tio2(110) interface, which is crucial in the photocatalytic chemistry of methanol on tio2 surfaces because methoxy is a more effective hole scavenger than methanol itself. the photocatalytic chemical reaction rate is increased by nearly 1 order of magnitude after 0.12 monolayer pt deposition. this work suggests that pt loading can promote the dissociation of methanol into methoxy and lower the desorption barrier of molecular hydrogen, which may work cooperatively with separating photoexcited charges to enhance the photocatalytic efficiency. our work implies the importance of the cocatalysts in affecting the surface structure and adsorption of reactants and products and then improving the photoactivity, in addition to the well known role in charge separation.
WOS关键词	MOLECULAR-HYDROGEN FORMATION ; PT-AU CLUSTERS ; METHYL FORMATE ; BOND SCISSION ; SURFACE ; TIO2 ; DECOMPOSITION ; WATER ; ADSORPTION ; DISSOCIATION
WOS研究方向	Chemistry
WOS类目	Chemistry, Physical
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000455286600031
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2372900
专题	大连化学物理研究所
通讯作者	Zhou, Chuanyao; Yang, Xueming
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, 457 Zhongshan Rd, Dalian 116023, Liaoning, Peoples R China 2.Sci & Technol Surface Phys & Chem Lab, POB 9-35, Jiangyou 621908, Sichuan, Peoples R China 3.Xidian Univ, Sch Phys & Optoelect Engn, Xian 710071, Shaanxi, Peoples R China 4.Southern Univ Sci & Technol, Dept Chem, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Hao, Qunqing,Wang, Zhiqiang,Wang, Tianjun,et al. Role of pt loading in the photocatalytic chemistry of methanol on rutile tio2(110)[J]. Acs catalysis,2019,9(1):286-294.
APA	Hao, Qunqing,Wang, Zhiqiang,Wang, Tianjun,Ren, Zefeng,Zhou, Chuanyao,&Yang, Xueming.(2019).Role of pt loading in the photocatalytic chemistry of methanol on rutile tio2(110).Acs catalysis,9(1),286-294.
MLA	Hao, Qunqing,et al."Role of pt loading in the photocatalytic chemistry of methanol on rutile tio2(110)".Acs catalysis 9.1(2019):286-294.

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