Surface alloy/GC电催化剂的制备与结构表征

Preparation and Characterization of Electro-catalyst of Surface Alloy Supported on Glassy Carbon

以玻碳为载体 ,通过电化学方法在其表面沉积催化物质研制表面合金纳米电催化剂 (Surfacealloy/GC)。运用电化学循环伏安 (CV)和扫描电镜 (SEM)等技术进行结构和性能表征。结果表明 ,在Surfacealloy/GC上氢的析出电位负移至 - 0 40V(SCE) ,与Pt电极相比负移约 15 0mV ,具有较高的电还原应用价值。另外 ,Surfacealloy/GC的氧化电位正移至 0 64V ,其稳定性明显高于电有机合成中常用的Pb、Sb、Cu等金属电极。SEM研究结果表明 ,所研制的Surfacealloy/GC电催化剂是一种由粒度约为

Electro-catalysts of surface alloy supported on glassy carbon (GC) were prepared by electrochemical codeposition method. Structures and properties of these electro-catalysts were studied through techniques of cyclic voltammetry (CV) and scanning electron microscope (SEM). The results demonstrated that the onset potential of hydrogen evolution on the surface alloy/GC was postponed to -0.40V,i.e.,negatively shifted by 150 mV in comparison with that of hydrogen evolution on a platinum electrode. In addition, the oxidization potential of the surface alloy/GC was positively shifted to above 0.64V, which is much higher than the oxidization potential of Pb and Sb metal electrodes. This indicates that the stability of the surface alloy/GC electrode is higher than that of Pb, Sb and Cu metal electrodes usually employed in organic electrosynthesis.The results of characterization by SEM have converged to illustrate that the surface alloy film is composed of nano-particles of about 70 nanometers in regular distribution.