氧化还原
纳米颗粒
纳米技术
胶体金
材料科学
光催化
化学
催化作用
生物化学
冶金
作者
Ziliang Mao,Randy Espinoza,Anthony L. Garcia,Adrian Enwright,Hnubci Vang,Son C. Nguyen
出处
期刊:ACS Nano
[American Chemical Society]
日期:2020-05-22
卷期号:14 (6): 7038-7045
被引量:28
标识
DOI:10.1021/acsnano.0c01704
摘要
Metallic nanoparticle-based photocatalysts have gained a lot of interest in catalyzing oxidation-reduction reactions. In previous studies, the poor performance of these catalysts is partly due to their operation that relies on picosecond-lifetime hot carriers. In this work, electrons that accumulate at a photostationary state, generated by photocharging the catalysts, have a much longer lifetime for catalysis. This approach makes it possible to determine and tune the photoredox potentials of the catalysts. As demonstrated in a model reaction, the photostationary state of the photocatalyzed oxidative etching of colloidal gold nanoparticles using FeCl3 was established under continuous irradiation of different wavelengths. The photoredox potentials of the nanoparticles were then calculated using the Nernst equation. The potentials can be tuned to a range of 1.28 to 1.40 V (vs SHE) under irradiation of different wavelengths in the range of 450 to 517 nm. The effects of particle size or optical power on the photoredox potentials are small compared to the wavelength effect. Control over the photoredox potential of the particles using different excitation wavelengths can potentially be used to tune the activities and selectivities of metallic nanoparticle photocatalysts.
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