(浙江工業(yè)大學(xué) 材料科學(xué)與工程研究所，杭州 310014)
摘 要: 采用線性掃描技術(shù)研究了氯鹽氨絡(luò)合物體系中Ti基IrO2涂層陽極的析氮過程， 對3種含有不同氧化物涂層電極的析氮電催化性能進行了比較， 并結(jié)合掃描電鏡(SEM)及能譜(EDX)探討了不同析氮電催化活性的原因。 研究結(jié)果表明： 當電極電位低于1.1 V(vs SCE)時， Ti基IrO2涂層陽極析氣反應(yīng)主要為析氮反應(yīng)， 氮氣的產(chǎn)生主要是由于氨水在電極上發(fā)生電化學(xué)氧化引起的; Ti基含PdRuTi的IrO2涂層陽極具有最佳的析氮電催化活性， 其可能原因是金屬元素PdRuTi的存在導(dǎo)致該電極表面特征裂紋最寬且最深， 氧化物涂層總析氮面積增多， 電催化活性增加。
關(guān)鍵字: 氨絡(luò)合物體系； Ti基IrO2陽極； 析氮； 電催化活性
（ Institute of Materials Science and Engineering,
Zhejiang University of Technology, Hangzhou 310014, China）
Abstract: Nitrogen evolution on Ti based IrO2 anodes in leaching solution containing ammonia and chloride was investigated by means of linear sweep voltammetric technique. The electrocatalytic activities of three different kinds of Ti based IrO2 containing different oxides species were compared with each other. The reasons of different electrocatalytic activities corresponding to different anodes were examined in terms of SEM and EDX. The results show that the main reaction on Ti based IrO2 anodes is nitrogen evolution, which is ascribed to the electrochemical oxidation of ammonia at electrode potential lower than 1.1 V or so. The Ti based IrO2 anode containing Pd, Ru, Ti elements displays better electrocatalytic activity. It is probably due to the existence of elements, such as Pd, Ru, Ti, which results in a wide and deep, typical morphology of cracks. The typical morphology of cracks contributes to the existence of electrochemically active surface area and an improvement of electrocatalytic active for nitrogen evolution.
Key words: ammonia coordinate system; Ti based IrO2 anode; nitrogen evolution; electrocatalytic activity
