CO electrochemical reduction (COER) allows the conversion of CO into fuels and chemicals. Copper is the only known catalyst that converts CO into hydrocarbon products but is hindered poor selectivity and stability. Cu-based bimetallic particles have shown to improve the selectivity and stability of the catalysts. This work reports a novel study in the use of a broad-range light source to induce the plasmonic effect in Cu, Ag and Cu-Ag bimetallic nanoparticle catalysts for COER. Active CuAg ( = 0, 50, 60, 75, 85, 100 at.%) catalysts were synthesized using a facile chemical reduction and compared to commercial counterparts. The catalytic activity of the particles was correlated with detailed physicochemical characterizations. The synthesized particles were found to be active catalysts for COER, with improved electro-catalytic activities exhibited by CuAg, CuAg and Cu syntheses in respective order. All nanoparticles demonstrated increases in the catalytic activity ranging between 15 and 26 % under white light illumination, attributed to plasmonic promotion using a broad visible wavelength range cold halogen lamp for the first time on COER. The best plasmonic promotion of 26 % was observed in the CuAg commercial alloy. Meanwhile, the best promotion of the synthesized bimetallic particles was of 18 % found in the CuAg catalyst. Additionally, improved electrochemical and plasmonic stability was observed with the use of the Cu-Ag bimetallic synthesized structures compared to monometallic Cu.

中文翻译：

---

铜、银和铜-银纳米催化剂上的等离子体增强 CO2 电还原

CO 电化学还原 (COER) 可以将 CO 转化为燃料和化学品。铜是唯一已知的将CO转化为碳氢化合物产品的催化剂，但其选择性和稳定性较差。铜基双金属颗粒已被证明可以提高催化剂的选择性和稳定性。这项工作报告了一项利用宽范围光源诱导 Cu、Ag 和 Cu-Ag 双金属纳米颗粒催化剂产生 COER 等离子体效应的新颖研究。使用简单的化学还原合成了活性 CuAg (= 0、50、60、75、85、100 at.%) 催化剂，并与商业对应物进行了比较。颗粒的催化活性与详细的物理化学特征相关。发现合成的颗粒是 COER 的活性催化剂，CuAg、CuAg 和 Cu 合成按顺序显示出改进的电催化活性。所有纳米颗粒在白光照射下均表现出催化活性增加 15% 至 26%，这归因于首次在 COER 上使用宽可见波长范围的冷卤素灯进行等离子体促进。在 CuAg 商用合金中观察到 26% 的最佳等离子体增强。同时，在CuAg催化剂中发现合成的双金属颗粒的最佳促进率为18%。此外，与单金属 Cu 相比，使用 Cu-Ag 双金属合成结构观察到电化学和等离子体稳定性得到改善。