Enhanced Performance of Co-doped Antimony Electrode for pH Measurement in Marine Environments  

作　　者：Li Zong Zhen Li Fan Yang Tao Xu Caiyun Zhang Tengfei Xu 

机构地区：[1]College of Chemistry and Chemical Engineering,Dezhou University,Dezhou 253023,China [2]Key Laboratory of Advanced Drug Delivery Systems of Zhejiang Province,College of Pharmaceutical Sciences,Zhejiang University,Hangzhou 310058,China [3]College of Textile and Clothing,Dezhou University,Dezhou 253023,China [4]Cangnan County Qiushi Innovation Research Institute of Traditional Chinese Medicine,Wenzhou 325899,China

出　　处：《Journal of Analysis and Testing》2025年第1期32-49,共18页分析检测(英文)

基　　金：financially supported by the National Natural Science Foundation of China(22104010);Shandong Provincial Natural Science Foundation of China(ZR2021QB141);Qingchuang Science and Technology Plan of Shandong Province(2021KJ054);Talent Incubation Project of Dezhou University(2019xjrc211,2019xjrc204 and SYJS22013);Dezhou Science and Technology Plan Project(2022dzkj057 and 2022dzkj058)。

摘　　要：The antimony(Sb)electrode,despite its prevalent use for pH detection in complex environments,suffers from severe potential drift due to poor corrosion resistance,thereby impeding long-term or online applications.Intermetallic compounds show excellent resistance to corrosion and oxidation,presenting a promising avenue for improving the stability of the Sb electrode.Therefore,we fabricate an intermetallic compound-doped Sb electrode by adding various cobalt(Co)contents to improve the stability of the Sb electrode without compromising the inherent pH response.It's observed that the alloy electrode exhibits a significant reduction in surface roughness,corrosion product Sb_(2)O_(3)content,cracks,and Sb exfoliation compared to the pure Sb electrode after the electrochemical tests,and the effect becomes more pronounced as the Co content increases.The electrochemical tests further reveal that the alloy electrode exhibits better corrosion resistance than the pure Sb in various solutions,with the alloy electrode containing 80 at%Sb showing the highest corrosion resistance.Moreover,the alloy electrode containing 80 at%Sb also shows excellent sensitivity and anti-interference ability,high accuracy and reproducibility,low hysteresis,and better long-term stability,especially in seawater.These findings suggest that inexpensive Co doping significantly enhances corrosion resistance,thereby reducing electrode surface alterations and eventually improving the potential stability of pure Sb electrodes without affecting the inherent pH response.Furthermore,the obtained results provide an experimental basis for the long-term operation of the alloy pH electrode in complex environments such as seawater without frequent maintenance.

关 键 词：pH measurement Antimony-cobalt alloy Solid-state electrode STABILITY Electrochemical test 

分 类 号：O657.1[理学—分析化学]