Catalytic electrogenerated chemiluminescence and nitrate reduction at CdS nanotubes modified glassy carbon electrode.
Electrochemical and electrogenerated chemiluminescence (ECL) properties of a glassy carbon electrode modified with CdS nanotubes (CdS-GCE) are investigated in neutral media. The cyclic voltammogram (CV) shows two cathodic peaks (P(C1) and P(C2)) at -0.76 and -0.97 V and an anodic peak (P(A)) at -0.8 V, while two ECL peaks around -0.76 V are observed. Similar mechanisms of both ECLs are supposed and possibly related to the capture of an electron at a surface trap, that is, the surface sulfide vacancy (V(S)(2+)) of CdS nanotubes and its electrocatalytic reduction to H(2)O(2) generated from the dissolved oxygen. P(C2) and P(A) are ascribed to the two-electron redox at V(S)(2+). Moreover, electrocatalysis to nitrate reduction is also found at P(C2), with a good linear relationship between nitrate concentration and electrocatalytic peak current in CV.
Fang
Yi-Min
YM
Ministry of Education Key Laboratory of Analysis and Determination for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou 350002, China.
Sun
Jian-Jun
JJ
Wu
Ai-Hong
AH
Su
Xiu-Li
XL
Chen
Guo-Nan
GN
D019187:Cadmium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D004566:Electrodes; D005898:Glass; D049449:Luminescence; D043942:Nanotubes; D009566:Nitrates / Q000737:chemistry*; D010084:Oxidation-Reduction; D013440:Sulfides / Q000737:chemistry*
D019187:Cadmium Compounds; D009566:Nitrates; D013440:Sulfides; C034939:cadmium sulfide; D002244:Carbon