Ultramicroelectrode array behavior of electrochemically partially blocked boron-doped diamond surface

Journal of the Brazilian Chemical Society

Avaca, Luis A.¹  Universidade Federal da Grande Dourados, Dourados, Brazil¹  Universidade Tiradentes, Aracaju, Brazil¹  Universidade de São Paulo, São Carlos, Brazil¹  Carvalho, Adriana E. de¹  Eguiluz, Katlin I. B.¹  Salazar-Banda, Giancarlo R.¹ 

关键词: surface termination;    anodic polarization;    cathodic polarization;    spherical diffusion;    cyclic voltammetry;   

DOI  :  10.5935/0103-5053.20130141

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

It is demonstrated, for the first time using simple cyclic voltammetry experiments, that the anodic pre-polarization of boron-doped diamond electrodes (BDD) leads to partially blocked surfaces. Anodically pre-polarized BDD electrodes, with different boron-doping levels, presented sigmoidal cyclic voltammetry profiles to the ferro/ferri-cyanide redox couple under low scan rate (0.5 mV s-1). On the other hand, when the same electrodes are cathodically pre-polarized, quasi-reversible and reversible responses were observed under the same scan rate, corresponding to surfaces with heterogeneous electroactivity. Thus, BDD surfaces can act as partially blocked or with heterogeneous electroactivity, depending on the polarization, anodic or cathodic, respectively.

【 授权许可】

Unknown