The influence of electrochemical pre-treatment of B-doped diamond films on the electrodeposition of Pt

Journal of the Brazilian Chemical Society

Sumodjo, Paulo T. A.¹  Universidade de São Paulo, São Paulo, Brazil¹  Ribeiro, Mauro C.¹  Silva, Leide G. da¹ 

关键词: boron-doped diamond electrodes;    Pt electrodeposition;    electro oxidation;   

DOI  :  10.1590/S0103-50532006000400006

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The influence of the substrate electrochemical pre-treatment in 0.5 mol L-1 H2SO4 on the Pt electrodeposition on boron-doped diamond, BDD, film electrodes was investigated. Platinum cannot be electrodeposited on a freshly prepared BDD electrode; however, potentiodynamic cycling or anodic potential steps at short times does activate the electrode. Anodic pre-treatment plays a dual role in the behavior of Pt deposition on BDD surfaces: Pt deposition is increased at short-term anodic pre-treatments, whereas at longer pre-treatment times Pt deposition was inhibited. These facts are explained in terms of wettability changes and passivation of the surface. Conversely, the oxide layer formed in these treatments increases the dispersion level of the catalyst.

【 授权许可】

Unknown