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Conversion of CO2 into value-added fuels and chemicals faces the challenges of high overpotential, low selectivity for desired products, and sluggish multi-electron transfer kinetics. Plasmon-mediated electrocatalytic methods show potential for overcoming these problems. In this work, choosing Au nanoparticles (NPs) as the dual-functional material of the electrocatalyst and plasmonic support, methanol can be efficiently produced from CO2 reduction. The dependences of current density and Faradaic efficiency (FE) on the Au NP size, light wavelength, and light density are systematically investigated. The performance test results show that CH3OH with FE as high as 52% can be obtained at a potential of −0.8 V (vs RHE) when a 20.2 nm Au NP-modified glass carbon electrode is under excitation using 520 nm light with a light density of 120 mW/cm2. The performance results, along with the discrete dipole approximation calculation and electrochemical characterizations, suggest that the efficient activation of CO2 by plasmon-generated energetic electrons accounts for the enhanced conversion rate and the high selectivity for CH3OH production.

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A novel Ni-Nd co-doped SnO 2 -Sb anode with macroporous titanium sheet as substrate (mp-Ti/SnO 2 -Sb-Ni-Nd anode) was prepared by modified sol-gel method. The surface morphology, the crystal structure and the valence of the dopants were characterized by SEM, XRD and XPS, respectively. In addition, CV, LSV, EIS, chronoamperometry measurements and accelerated lifetime test were also carried out to study the electrochemical properties and stability of the anodes. The results indicated that mp-Ti/SnO 2 -Sb-Ni-Nd anode possessed a lower charge transfer resistance and a longer service life than other modified SnO 2 -Sb anodes. Electrocatalytic oxidation of phenol was studied under a constant current density of 10 mA • cm −2 at 25 • C to evaluate the potential applications of the electrodes. The co-doping of Ni-Nd significantly enhanced the degradation of phenol and the total organic carbon (TOC) removal efficiency on SnO 2 -Sb anode, which might be attributed to the improved generation of reactive oxygen species (ROS) to the solution and the dominant action of indirect oxidation.

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