球形微粒Co3O4电极催化氧化硫离子

Catalytic Oxidation of Sulfide Ion over a Spherular-Co_3O_4 Electrode

尝试用氨蒸发诱导合成方法在石墨小片上生长球形Co3O4微粒,并用其制备电极且进行S2-的电化学氧化研究.用极化曲线、恒电位技术等电化学方法考察了Co3O4电极对S2-的电化学氧化的催化性能,发现Co3O4电极对电化学氧化S2-具有优异的催化性能,极大地促进了-0.40V附近S2-向含硫的酸根离子和低级多硫离子的转变,电流密度最大可以达到580mA·cm-2.恒电位极化表明电极的电催化稳定性良好;电化学阻抗谱(EIS)测试显示Co3O4在碱性S2-电解液中的电荷转移电阻很小,这从电化学动力学角度解释了它对S2-具有良好的催化性能.

Spherular-Co3O4 particles were synthesized on graphite electrode surface by ammonia-evaporation-induction.Its electrooxidation catalytic behavior for sulfide ions in an alkaline solution was investigated by electrochemical measurements such as potentiodynamic scanning and potentiostatic polarization.We found that high catalytic activity and the highest current density of 580 mA · cm^-2 were obtained at-0.40 V.In addition,its catalytic performance was stable during potentiostatic polarization.Electrochemical impedance spectroscopy （EIS） indicated a low charge transfer resistance,which explained the high catalytic activity from the viewpoint of electrochemical kinetics.