A novel three-dimensional gold catalyst prepared by simple pulse electrodeposition and its high electrochemical performance for hydrogen peroxide reduction

作者：Ye, Ke; Zhang, Dongming; Wang, Xin; Cheng, Kui; Cao, Dianxue^*

来源：RSC Advances, 2015, 5(5): 3239-3247.

DOI：10.1039/c4ra12225a

• CARBON-FIBER CLOTH
• FORMIC-ACID ELECTROOXIDATION
• FUEL-CELL
• H2O2 ELECTROREDUCTION
• DIRECT BOROHYDRIDE
• ELECTROCATALYTIC ACTIVITY
• PD/C CATALYST
• CATHODE
• NANOARRAYS
• PLATINUM

Novel Au nanoparticles (NP), Au pinecones (PC) and Au nanodendrites (ND) supported on carbon coated titanium dioxide (C@TiO2) nanoarrays were successfully obtained through a facile chemical vapor deposition of three-dimensional (3D) C@TiO2 substrate, followed by potential pulse electrodeposition of Au electrocatalysts. The morphology and structure of the open 3D Au-C@TiO2 electrodes was characterized by scanning electron microscopy and X-ray diffractometry. The different morphology of electrodeposited Au can be easily controlled by the applied potential (E-o). Electrochemical methods, including cyclic voltammetry, linear sweep voltammetry and chronoamperometry, were used to examine the catalytic activity of the electrode for H2O2 electroreduction in H2SO4 solution. The Au ND-C@TiO2 electrode exhibited the largest effective specific surface area among the Au-C@TiO2 electrodes, owing to its open nanodendritic structure allowing the full utilization of Au surface active sites. A nearly constant reduction current density of 0.655 A cm(-2) was successfully achieved on the Au ND-C@TiO2 electrode at the potential of 0 V in 2.0 mol L-1 H2O2 + 2.0 mol L-1 H2SO4 solution, which was significantly higher than the catalytic activity of H2O2 electroreduction achieved previously with precious metals as catalysts.

• 出版日期2015
• 单位哈尔滨工程大学