Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II: effect of potential
Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II: effect of potential
复制标题
DOI：
10.1016/s0013-4686(97)10116-5
复制
发表时间：
1998-01-01
影响因子：
6.6
通讯作者：
Hart, AL
中科院分区：
文献类型：
--
作者：
Hall, SB;Khudaish, EA;Hart, AL
用阶梯电位法研究了H_2O_2在铂转盘电极上的电化学氧化。在pH为7.26的条件下，H_2O_2的浓度范围为0~70 mm，转速为630~10000转/分，阳极电位为+264~+712 mV。提出了稳态电流随转速、[H_2O_2]和阳极电位变化的机理。该机理包括H_2O_2与电化学生成的铂(II)表面中心的可逆结合、还原中心以及抑制H+和O-2的竞争吸附。测定了H_2O_2、H~+和O~-2结合常数的电位不变值，并计算了结合位还原和再氧化的速率常数作为电位的函数。(C)1998爱思唯尔科学有限公司。保留所有权利。
The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential + 264 to + 712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O-2. Potential-invariant values of the constants for H2O2, H+ and O-2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated. (C) 1998 Elsevier Science Ltd. All rights reserved.