The surface plasmon-enhanced catalytic performance of a gold caviar-like assembly (Au-CA) in methanol electrooxidation was investigated with and without simulated solar irradiation. An Au-CA catalyst synthesized by an ion sputtering method not only exhibited an excellent anodic peak current density (115.86 μA μg⁻¹) but also displayed long-term catalytic stability for methanol electrooxidation. The Au-CA catalyst also provided an anodic peak current density of 248.9 μA μg⁻¹ for methanol electrooxidation under simulated solar irradiation. This value corresponded to a 2.15-fold increase with respect to that in the absence of solar light irradiation in a deoxygenated solution of 1.0 M KOH and 1.5 M CH₃OH. The diffuse reflectance UV-vis absorption spectra and photoelectric response performance of the as-prepared Au-CA catalyst were investigated to understand the effectiveness of the surface plasmon resonance of Au nanoparticles for the enhancement of methanol electrooxidation performance. The results showed that the Au-CA catalyst exhibited a broad absorption peak at a wavelength of 515 nm with a red shift in comparison with that of a solution of Au nanoparticles. The photocurrent density of the Au-CA catalyst was 175.8 μA μg⁻¹ at an irradiation wavelength of 468 nm, which was 2.5 times higher than that at 640 nm (70.2 μA μg⁻¹) in a deoxygenated solution of 0.5 M Na₂SO₄. These findings suggested the potential of the new strategy for the improvement of the activity and durability of Au in methanol electrooxidation in direct methanol fuel cell technologies.

中文翻译：

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太阳光下金鱼子酱状组件的表面等离子体增强活性和甲醇氧化的稳定性†

研究了在有和没有模拟太阳辐射的情况下，金鱼子酱状组件（Au-CA）在甲醇电氧化中的表面等离子体增强催化性能。通过离子溅射法合成的Au-CA催化剂不仅显示出优异的阳极峰值电流密度（115.86μAμg ^-1），而且还显示出对于甲醇电氧化的长期催化稳定性。在模拟太阳辐射下，Au-CA催化剂还为甲醇电氧化提供了248.9μAμg ^-1的阳极峰值电流密度。与在1.0 M KOH和1.5 M CH ₃的脱氧溶液中不存在太阳光照射的情况下相比，该值相应地增加了2.15倍。哦。研究了制备的Au-CA催化剂的漫反射紫外可见吸收光谱和光电响应性能，以了解Au纳米粒子的表面等离振子共振对增强甲醇电氧化性能的有效性。结果表明，与Au纳米颗粒的溶液相比，Au-CA催化剂在515nm的波长处显示出宽的吸收峰，并且发生红移。在468 nm的照射波长下，Au-CA催化剂的光电流密度为175.8μAμg- ¹，是在0.5 M Na ₂ SO的脱氧溶液中在640 nm（70.2μAμg ^-1）的光电流密度的2.5倍。₄。这些发现表明，在直接甲醇燃料电池技术中，用于改善金在甲醇电氧化中的活性和持久性的新策略的潜力。