Polyoxometalate-based metal–organic framework loaded with an ultra-low amount of Pt as an efficient electrocatalyst for hydrogen production
| Autor: | Huaqiao Tan, Yong-Hui Wang, Yuan-Yuan Ma, Yangguang Li, Jianing Liu, Xiaojian Yang, Haiyue Peng |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Composite number chemistry.chemical_element 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Chemical engineering chemistry Polyoxometalate General Materials Science Metal-organic framework 0210 nano-technology Carbon Hydrogen production |
| Zdroj: | CrystEngComm. 20:5387-5394 |
| ISSN: | 1466-8033 |
| Popis: | The development of highly active and stable electrocatalysts for HER has been received extensive attention. Among these, minimizing the Pt usage and promoting its utilization efficiency are essential prerequisites for a future hydrogen economy. Herein, we use a new e-Keggin-type polyoxometalate-based metal–organic framework H3[Zn4(bimb)2][PMoV8MoVI4O40]·12H2O (POMOF-1) as a support to load a low amount of ultrasmall Pt nanoparticles (NPs), and then mix this material with Ketjenblack carbon (KB) to form a new composite catalyst (Pt@POMOF-1/KB). This composite catalyst shows a low Pt loading amount of 0.43 wt% and the average size of the Pt NPs is 1.5 nm. Pt@POMOF-1/KB exhibits a remarkable HER performance in 0.5 M H2SO4. It only requires an overpotential to of 23 mV to observe a current density of 10 mA cm−2, which is superior to that of 20% Pt/C. The mass activity of Pt@POMOF-1/KB is almost 100 and 37 times that of 20% Pt/C at overpotentials of 50 and 100 mV, respectively, as a consequence of the very low noble-metal loading. This result may provide an approach to meet the cost requirements for large-scale applications. |
| Databáze: | OpenAIRE |
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