In situ XANES studies of electrodeposited nickel oxide films with metal additives for the electro-oxidation of ethanol
In situ XANES studies of electrodeposited nickel oxide films with metal additives for the electro-oxidation of ethanol
复制标题
DOI：
10.1149/1.1613671
复制
发表时间：
2003-11-01
影响因子：
3.9
通讯作者：
Park, SM
中科院分区：
文献类型：
--
作者：
Kim, JW;Park, SM
采用原位X射线吸收近边结构（XANES）研究了添加钠、钴、钌及其组合的电沉积氧化镍电极作为乙醇电氧化的阳极材料。电极的电化学性能进行了研究，通过监测氧化状态的金属氧化物在电极本身的氧化过程中，以及在乙醇的氧化过程中，在碱性介质。Ni-Co-Ru电极对乙醇的电化学氧化表现出最好的性能，其阳极峰电流增加，过电压降低。对这些复合电极的Ni和Co K边的XANES数据的分析表明，取决于施加的电势，Ni和Co分别处于Ni 3 +-Ni 4+和Co 3 +-Co 4+混合状态。镍氧化物膜中钴和/或钌的存在增强了乙醇氧化的电极性能，这是由于经由电生成的镍氧化物产生钴和钌的高度氧化态。(C)2003年电化学学会。
Electrodeposited nickel oxide electrodes with additives such as sodium, cobalt, ruthenium, and their combination were evaluated as the anode materials for the electro-oxidation of ethanol using in situ x-ray absorption near edge structure (XANES). Electrochemical properties of the electrodes were studied by monitoring oxidation states of metal oxides during oxidation of electrodes themselves, as well as during oxidation of ethanol, in alkaline media. The Ni-Co-Ru electrode showed the best performance with increased anodic peak currents and lower overvoltages for electrochemical oxidation of ethanol. Analysis of the XANES data for the Ni and Co K-edges of these composite electrodes revealed that both Ni and Co are in the Ni3+-Ni4+ and Co3+-Co4+ mixed states, respectively, depending on applied potentials. The presence of cobalt and/or ruthenium in nickel oxide films enhanced the electrode performances for ethanol oxidation due to generation of highly oxidized states of cobalt and ruthenium via electrogenerated nickel oxides. (C) 2003 The Electrochemical Society.