Small-sized Ni(111) particles in metal-organic frameworks with low over-potential for visible photocatalytic hydrogen generation | |
Zhen WL(甄文龙)1,2; Ma JT(马建泰)2; Lu GX(吕功煊)1 | |
刊名 | Applied Catalysis B: Environmental |
2016 | |
卷号 | 190页码:12-25 |
关键词 | Small-sized Ni(111) particles Metal-organic frameworks Low over-potential Visible photocatalytic hydrogen generation |
ISSN号 | 0926-3373 |
通讯作者 | 吕功煊 |
英文摘要 | The development of an advanced co-catalyst is critical for improving the efficiency of the photocatalytic hydrogen evolution reaction. Noble metals (such as Pt) have been identified to be the most active co-catalyst for this reaction since they exhibit significantly low over-potential. However, their low-abundance, high cost, its scale-up setup usage is impeditive. Here, we reported that high efficient small-sized nickel particles embedded in the frameworks of MOF-5 as a co-catalyst with low over-potential for visible photocatalytic hydrogen evolution. The electrochemical measurements showed a low over-potential of −0.37 V, which have the similar over-potential as Pt@MOF-5. Such low over-potential is attributed to their high dispersion (41.8%), small-sized nickel particles (∼9 nm), and high specific surface area of MOF-5 (2973 m2/g). As evidenced by electrochemical impedance spectra (EIS) measurements, Ni nanoparticles with exposed (1 1 1) facet were more benefited the electrons transfer from MOF-5 than that of (2 0 0) facet one. In addition, Ni@MOF-5 exhibited the larger transient photocurrent and longer fluorescence lifetime. These results led to the high photocatalytic activities and stability for hydrogen evolution sensitized by Eosin Y (EY) over Ni@MOF-5. The rate of hydrogen evolution reached 30.22 mmol h−1 g−1[Ni] (at pH 11) over Ni@MOF-5 irradiated under visible light irradiation (λ ≥420 nm) in 2 h. The apparent quantum efficiency (AQE) of 16.7% over EY-Ni@MOF-5 was achieved at 430 nm. MOF-5 might promote the photogenerated electrons transfer from excited EY to the hydrogen evolution active sites (Ni), and consequently enhance photocatalytic hydrogen evolution efficiency. |
学科主题 | 物理化学与绿色催化 |
收录类别 | SCI |
资助信息 | the 973 Program of Department of Sciences and Technology China (Grant No. 2013CB632404);the National Natural Science Foundation of China (Grant No.21433007;21373245) |
语种 | 英语 |
WOS记录号 | WOS:000374604900002 |
内容类型 | 期刊论文 |
源URL | [http://210.77.64.217/handle/362003/19495] |
专题 | 兰州化学物理研究所_OSSO国家重点实验室 兰州化学物理研究所_ERC国家工程研究中心 |
作者单位 | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China 2.Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Zhen WL,Ma JT,Lu GX. Small-sized Ni(111) particles in metal-organic frameworks with low over-potential for visible photocatalytic hydrogen generation[J]. Applied Catalysis B: Environmental,2016,190:12-25. |
APA | Zhen WL,Ma JT,&Lu GX.(2016).Small-sized Ni(111) particles in metal-organic frameworks with low over-potential for visible photocatalytic hydrogen generation.Applied Catalysis B: Environmental,190,12-25. |
MLA | Zhen WL,et al."Small-sized Ni(111) particles in metal-organic frameworks with low over-potential for visible photocatalytic hydrogen generation".Applied Catalysis B: Environmental 190(2016):12-25. |
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