Reversed Charge Transfer and Enhanced Hydrogen Spillover in Platinum Nanoclusters Anchored on Titanium Oxide with Rich Oxygen Vacancies Boost Hydrogen Evolution Reaction
| Autor: | Zhen-Wei Wei, Chao Zhang, Tong-Bu Lu, Kun Xu, Hong-Juan Wang, Xiu-Li Lu |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Proton 010405 organic chemistry chemistry.chemical_element General Chemistry General Medicine 010402 general chemistry Photochemistry Electrocatalyst 01 natural sciences Oxygen Catalysis 0104 chemical sciences Nanoclusters Titanium oxide symbols.namesake chemistry symbols Hydrogen spillover Raman spectroscopy |
| Zdroj: | Angewandte Chemie. |
| ISSN: | 1521-3757 0044-8249 |
| Popis: | The catalytic activity of metal clusters is closely related with the support; however, knowledge on the influence of the support on the catalytic activity is scarce. We demonstrate that Pt nanoclusters (NCs) anchored on porous TiO2 nanosheets with rich oxygen vacancies (VO -rich Pt/TiO2 ) and deficient oxygen vacancies (VO -deficient Pt/TiO2 ), display significantly different catalytic activity for the hydrogen evolution reaction (HER), in which VO -rich Pt/TiO2 shows a mass activity of 45.28 A mgPt -1 at -0.1 V vs. RHE, which is 16.7 and 58.8 times higher than those of VO -deficient Pt/TiO2 and commercial Pt/C, respectively. DFT calculations and in situ Raman spectra suggest that porous TiO2 with rich oxygen vacancies can simultaneously achieve reversed charge transfer (electrons transfer from TiO2 to Pt NCs) and enhanced hydrogen spillover from Pt NCs to the TiO2 support, which leads to electron-rich Pt NCs being amenable to proton reduction of absorbed H*, as well as the acceleration of hydrogen desorption at Pt catalytic sites-both promoting the HER. Our work provides a new strategy for rational design of highly efficient HER catalysts. |
| Databáze: | OpenAIRE |
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