College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Nanoscale. 2019 Oct 10;11(39):18320-18328. doi: 10.1039/c9nr06839b.
Plasmonic metal nanocatalysts have excellent light trapping properties and high chemical reactivity. Impressively, Au nanostructures can absorb a wide array of visible light by tuning their morphology. In this work, spherical gold nanoparticles (Au NSs), multi-branched gold nanoparticles (Au NMs) and gold nanorods (Au NRs) were successfully synthesized; the shape- and size-dependences of these gold nanocatalysts on the methanol oxidation reaction (MOR) under light irradiation were studied. It is worth mentioning that Au NRs have the highest anode peak current density under dark conditions due to the exposure of highly active facets. A similar enhancement effect was obtained for Au NSs and Au NMs under visible light irradiation, which is due to the generation of a high concentration of energetic charge carriers on these Au nanostructures. The size dependences of Au NSs on the MOR showed that a larger electrochemically active surface area (ECSA) was obtained for small nanoparticles, which is due to the surface effect. In addition, the catalytic performance, durability and anti-CO stripping of these Au nanocatalysts under visible light irradiation, as well as the effect of light intensity and wavelength were described in detail. This work provides an insight into the mechanism of plasmon enhanced electrocatalysis by Au nanostructures with different sizes and shapes.
等离子体金属纳米催化剂具有优异的光捕获性能和高化学反应活性。令人印象深刻的是，通过调整金纳米结构的形态，它们可以吸收广泛的可见光。在这项工作中，成功合成了球形金纳米粒子（Au NSs）、多分支金纳米粒子（Au NMs）和金纳米棒（Au NRs）；研究了这些金纳米催化剂的形状和尺寸对光照下甲醇氧化反应（MOR）的影响。值得注意的是，由于暴露了高活性面，Au NRs 在黑暗条件下具有最高的阳极峰电流密度。在可见光照射下，Au NSs 和 Au NMs 也获得了类似的增强效果，这是由于这些 Au 纳米结构上产生了高浓度的高能载流子。Au NSs 对 MOR 的尺寸依赖性表明，较小的纳米颗粒获得了更大的电化学活性表面积（ECSA），这是由于表面效应。此外，详细描述了这些 Au 纳米催化剂在可见光照射下的催化性能、耐久性和抗 CO 剥离性能，以及光强和波长的影响。这项工作深入了解了不同尺寸和形状的 Au 纳米结构的等离子体增强电催化的机制。
