Electrocatalytic Reduction of Peroxodisulfate in 0.5 M NaOH at Copper Electrodes. A Combined Quartz Microbalance and Rotating Ring/Disc Electrode Investigation
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
The Journal of Physical Chemistry B
ISSN: 1520-6106
, E-ISSN: 1520-5207
|
| Output data |
Year: 1997,
Volume: 101,
Number: 14,
Pages: 2411-2414
Pages count
: 4
DOI:
10.1021/jp9627279
|
| Tags |
ALKALINE-SOLUTIONS; SURFACE; OXIDATION; CU(111); FILM |
| Authors |
Hartinger S.
1,2
,
Rosenmund J.
1
,
Savinova E.
1,3
,
Wasle S.
1
,
Doblhofer K.
1
|
| Affiliations |
| 1 |
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin-Dahlem, Germany
|
| 2 |
Instituto de Quimica, Universidade Estadual de Campinas, CP 6154, 13081 970 Campinas, SP, Brazil
|
| 3 |
Boreskov Institute of Catalysis, Lavrentjeva 5, 630090 Novosibirsk, Russia
|
|
From an electrochemical investigation by means of an electrochemical quartz microbalance, a rotating disc electrode, and a ring/disc electrode, two mechanisms for the reduction of S2O82- became apparent. Besides the well-known outer-sphere cathodic reduction, a catalytic mechanism of S2O82- reduction operates in a potential range between the surface oxide region (≈−0.5 V/SCE) and −1.0 V/SCE. It involves the chemical oxidation of the copper surface to a soluble Cu(I) species. The catalytic mechanism is concluded to result from the specific interaction between S2O82- and the Cu surface modified by the presence of subsurface oxygen.