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材料工程  2016, Vol. 44 Issue (12): 7-12    DOI: 10.11868/j.issn.1001-4381.2016.12.002
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
pH值对阳极电沉积Mn-Mo氧化物结构与性能的影响
史艳华, 赵杉林, 梁平, 王玲, 关学雷
辽宁石油化工大学 机械工程学院, 辽宁 抚顺 113001
Effect of pH Value on Structure and Properties of Anodic Electrodeposited Mn-Mo Oxide
SHI Yan-hua, ZHAO Shan-lin, LIANG Ping, WANG Ling, GUAN Xue-lei
School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
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摘要 通过热力学计算修正的MnSO4-SO42--H2O镀液体系平衡电势E0-pH图,明确了363K和Mn2+浓度0.2mol·dm-3时MnO2物相结构材料阳极电沉积有效pH值范围,通过对氧化物结构表征及电化学性能测试获得了pH值的影响规律。结果表明:pH值在0.33~3.4时,随着pH值增大,有利于MnO2物相结构Mn-Mo氧化物的有效析出,但pH值增大虽可提高阳极电沉积效率,却造成镀层质量变差,电催化性能明显劣化,镀液pH=0.5时获得的Mn-Mo氧化物具有优异的镀层质量和高的电催化性能。原因分析表明,该现象主要与氧化物制备过程中析氧反应的竞争密切相关:pH值较小时,竞争析氧反应造成固液界面搅动,抑制氧化物枝晶生长,同时使扩散层减薄,促进氧化物在电极微观表面各处更多形核,细化晶粒,从而提高氧化物的电催化性能。
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史艳华
赵杉林
梁平
王玲
关学雷
关键词 Mn-Mo氧化物阳极电沉积pH值析氧反应电催化性能    
Abstract:By correction to the thermodynamic calculation based on E0-pH diagram of MnSO4-SO42--H2O plating system, effective pH value range for anodic electrodeposition of MnO2 phase structure materials got clear, at 363K, with Mn2+ concentration 0.2mol·dm-3. The influence law of the pH values was also obtained based on the characterization of the oxide structure and test of its electrochemical performance. The results show that pH value in the 0.33-3.4 range, with its increase and accordingly the conducive to the effective deposition of MnO2 type Mn-Mo oxide. However, although with pH value increasing, deposition efficiency improves, the coating quality gets degraded, especially making the electrocatalytic performance of the oxide obviously deteriorated. It also shows that with pH value of plating solution 0.5, obtained Mn-Mo oxide has excellent coating quality and high electrocatalytic activity. The reason is closely related to competition in oxygen evolution reaction during the preparation of the oxide. When pH value is small, oxygen evolution reaction competition causes the solid-liquid interface stirring, the dendritic growth of oxide gets inhabited and the diffusion layer gets thinning, which promotes the nucleation of oxide on the electrode micro-surface and makes grain refined, so as to improves the electrocatalytic performance of oxide.
Key wordsMn-Mo oxide    anodic electrodeposition    pH value    oxygen evolution reaction    electrocatalysis behavior
收稿日期: 2016-03-20      出版日期: 2016-12-16
中图分类号:  O604  
通讯作者: 史艳华(1971-),女,副教授,博士,主要从事材料电化学、腐蚀与防护技术方面的研究工作,联系地址:辽宁省抚顺市望花区丹东路西段一号辽宁石油化工大学机械工程学院(113001),E-mail:shiyanhua_2010@163.com     E-mail: shiyanhua_2010@163.com
引用本文:   
史艳华, 赵杉林, 梁平, 王玲, 关学雷. pH值对阳极电沉积Mn-Mo氧化物结构与性能的影响[J]. 材料工程, 2016, 44(12): 7-12.
SHI Yan-hua, ZHAO Shan-lin, LIANG Ping, WANG Ling, GUAN Xue-lei. Effect of pH Value on Structure and Properties of Anodic Electrodeposited Mn-Mo Oxide. Journal of Materials Engineering, 2016, 44(12): 7-12.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.12.002      或      http://jme.biam.ac.cn/CN/Y2016/V44/I12/7
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