Inhibition of hydrogen and oxygen reverse recombination reaction over Pt/TiO2 by F- ions and its impact on the photocatalytic hydrogen formation | |
Department | OSSO国家重点实验室 |
Wang M(王蒙)1,2,3; Li Z(李振)1,2; Wu YQ(吴玉琪)1; Ma JT(马建泰)3; Lu GX(吕功煊)1; Wu YQ(吴玉琪); Lv GX(吕功煊) | |
2017 | |
Source Publication | Journal of Catalysis |
ISSN | 0021-9517 |
Volume | 353Pages:162-170 |
Abstract | Photoelectrochemical and photocatalytic water splitting to generate hydrogen are regarded as potential methods to obtain hydrogen. In the semiconductor photocatalytic dispersion, noble metallic Pt is usually used as a co-catalyst to catalyze those reactions. However, Pt can also act as an active center for H2 and O2 recombination back reaction, which results in the very low photocatalytic efficiency for H2 generation. Here we reported that the recombination rate nearly linearly increased with the increase of Pt loading amount in the low Pt loading region, while decreased in high Pt loading region. Very trace amount of fluorine ion can remarkably inhibit hydrogen and oxygen recombination. Detail study indicated that this inhibition was achieved via the occupation of hydrogen and oxygen adsorption and activation sites by fluorine ion over Pt due to the strong tendency of adsorption of fluorine ion on Pt. By taking advantage of this inhibition role of fluorine ions, the Pt/TiO2 activity for water splitting is remarkable enhanced up to 23 times. Isotope experiments with D2O and H2 18O confirmed hydrogen and oxygen were both from water. Our results clearly indicated that the excellent photocatalytic performance for water splitting over fluorine doped on TiO2 might be related to the role of fluorine inhibition on H2 and O2 recombination back reaction, which would shine light to the new photocatalyst preparation for water splitting. |
Keyword | Water Splitting H2 And O2 RecombinatiOn Back ReactiOn On Pt Co-catalyst InhibitiOn Role Of Fluorine IOns On Recombination Reaction |
Subject Area | 物理化学与绿色催化 |
DOI | 10.1016/j.jcat.2017.07.010 |
Funding Organization | the National Natural Science Foundation of China (Grant Nos. 21433007;21373245); the 973 Program of Department of Sciences and Technology China (Grant No. 2013CB632404) |
Indexed By | SCI |
If | 6.844 |
Language | 英语 |
Funding Project | 环境催化与氢能研究组 |
compositor | 第一作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/22477 |
Collection | 羰基合成与选择氧化国家重点实验室(OSSO) |
Corresponding Author | Wu YQ(吴玉琪); Lv GX(吕功煊) |
Affiliation | 1.Chinese Acad Sci, Lanzhou Inst Chemial Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Gansu, Peoples R China |
Recommended Citation GB/T 7714 | Wang M,Li Z,Wu YQ,et al. Inhibition of hydrogen and oxygen reverse recombination reaction over Pt/TiO2 by F- ions and its impact on the photocatalytic hydrogen formation[J]. Journal of Catalysis,2017,353:162-170. |
APA | Wang M.,Li Z.,Wu YQ.,Ma JT.,Lu GX.,...&吕功煊.(2017).Inhibition of hydrogen and oxygen reverse recombination reaction over Pt/TiO2 by F- ions and its impact on the photocatalytic hydrogen formation.Journal of Catalysis,353,162-170. |
MLA | Wang M,et al."Inhibition of hydrogen and oxygen reverse recombination reaction over Pt/TiO2 by F- ions and its impact on the photocatalytic hydrogen formation".Journal of Catalysis 353(2017):162-170. |
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