Atomic-precision tailoring of Au–Ag core–shell composite nanoparticles for direct electrochemical-plasmonic hydrogen evolution in water splitting
| Autor: | Shik Chi Edman Tsang, Tong Li, Yun-Liang Soo, Tai-Sing Wu, Shengda D. Pu, Simson Wu, Alex W. Robertson, Weikai Xiang, Jiaying Mo, Eduardo C. M. Barbosa, Yiyang Li, Pedro H. C. Camargo, Yuancheng Sun, Winson C. H. Kuo, Tiago Vinicius Alves |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Heterojunction Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials Photocatalysis Water splitting Hydrogen evolution Composite nanoparticles Surface plasmon resonance 0210 nano-technology Plasmon |
| Popis: | Traditionally, bandgap materials are a prerequisite to photocatalysis since they can harness a reasonable range of the solar spectrum. However, the high impedance across the bandgap and the low concentration of intrinsic charge carriers have limited their energy conversion. By contrast, metallic nanoparticles possess a sea of free electrons that can effectively promote the transition to the excited state for reactions. Here, an atomic layer of a bimetallic concoction of silver–gold shells is precisely fabricated onto an Au core via a sonochemical dispersion approach to form a core–shell of Au–Ag that exploits the wide availability of excited states of Ag while maintaining an efficient localized surface plasmon resonance (LSPR) of Au. Catalytic results demonstrate that this mix of Ag and Au can convert solar energy to hydrogen at high efficiency with an increase of 112.5% at an optimized potential of −0.5 V when compared to light-off conditions under the electrochemical LSPR. This outperforms the commercial Pt catalysts by 62.1% with a hydrogen production rate of 1870 µmol g−1 h−1 at room temperature. This study opens a new route for tuning the range of light capture of hydrogen evolution reaction catalysts using fabricated core–shell material through the combination of LSPR with electrochemical means. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|