Light-assisted surface reactions on metal nanoparticles,Catalysis Science & Technology

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Light-assisted surface reactions on metal nanoparticles
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1039/c8cy00674a
Chanyeon Kim _{1,

2,

3,

4} , Hyunjoo Lee _{1,

2,

3,

4}

Affiliation

Surface catalytic reactions typically occur on metal nanoparticles deposited on inert supports with high surface area. Recently, many studies have reported that the catalytic activity of metal nanoparticles can be enhanced significantly under light irradiation. This ‘light-assisted surface reaction’ can lower reaction temperature, potentially reducing the energy use. Light can be absorbed via intra- or inter-band transition within metal nanoparticles or direct photoexcitation of adsorbates on the surface. The absorbed energy can be relaxed through a radiative or non-radiative process; the non-radiative relaxation can produce heat or energetic electrons, enhancing the surface catalytic reaction with lower activation energy. The enhancement depends on the light intensity or wavelength. Plasmonic metals Au, Ag, and Cu have been widely studied for the ‘light-assisted surface reaction’, but composites of plasmonic metals with semiconductors or other metals such as Pt, Pd, or Ni have also been used for the surface reaction. Most recently, non-plasmonic metal Pt has shown an enhancement upon light irradiation due to the photoexcitation of electrons in the orbitals of adsorbates. The light-assisted surface reaction is still in the infancy stage, but it would surely provide more facile ways to control surface reactions and minimize the overall energy use.

中文翻译：

金属纳米粒子上的光辅助表面反应

表面催化反应通常发生在具有高表面积的惰性载体上沉积的金属纳米颗粒上。近来，许多研究报告了在光照射下金属纳米颗粒的催化活性可以显着提高。这种“光辅助表面反应”可以降低反应温度，从而潜在地减少能源消耗。光可以被吸收通过金属纳米粒子内的带内或带间跃迁或表面上吸附物的直接光激发。吸收的能量可以通过辐射或非辐射过程得到放松。非辐射弛豫可产生热量或高能电子，从而以较低的活化能增强表面催化反应。增强取决于光强度或波长。等离子体金属Au，Ag和Cu已被广泛研究用于“光辅助表面反应”，但是等离子体金属与半导体或其他金属（例如Pt，Pd或Ni）的复合材料也已用于表面反应。最近，由于在被吸附物的轨道中电子的光激发，非等离子体金属Pt在光照射下显示出增强。

更新日期：2018-06-28

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