中国海洋大学学报（自然科学版）2025，Vol.55Issue(8)：102-110,9.DOI:10.16441/j.cnki.hdxb.20240168
钛基铂涂层电极用于海洋氧化还原电位的长期监测
Long-Term Monitoring of the Redox Potential of Seawater Using Platinum-Coated Titanium Electrode
摘要
Abstract
This study aims to develop a high-strength,low-cost platinum-coated titanium electrode for long-term monitoring of oxidation-reduction potential(ORP)in marine environment.The electrodes were prepared using a thermal decomposition-hydrogen reduction method.Scanning Electron Microsco-py(SEM)and X-Ray Diffraction(XRD)analyses show that the electrode surface is uniform and dense,with numerous Ti3Pt nanocrystals having an average size of approximately 42 nm and a coating thickness of only 2 μm.The high strength of this intermetallic compound coating was confirmed by extending the hydrogen evolution-enhanced electrolysis life to 210 h.Compared with commercial platinum electrode,the electrochemical performance of coating electrodes was performed by open circuit potential(OCP)and cyclic voltammetry(CV)tests.The coating electrode quickly stabilized in standard solutions,which will facilitate the on-site calibration.However,in seawater,the equilibrium was slowly established(0.5～4 h),highlighting the importance of semi-quantitative assessment of ORP.In seawater,the coating electrode exhibited a Nernst response sensitivity of nearly-43 mV per pH unit to pH changes,and a temperature coefficient of-2.1 mV·℃-1,which facilitates the calibration in use.The oxygen concentration affects the surface state of electrodes and the ORP process,leading to a meaningless com-parison of different absolute potential.After 104 days of immersion in seawater,it was observed that an oxide film was rapidly formed on electrode surface within 1～2 days,which easily adsorbed the pollu-tants to some extent,and the potential of coating electrode was stabilized more quickly than platinum electrode.Therefore,the low-platinum load,high-strength coating electrode provides an effective and promising indicator electrode for long-term ORP monitoring in marine environment.关键词
氧化还原电位/钛基铂涂层电极/Ti3Pt纳米晶粒/海洋环境/长期监测Key words
oxidation-reduction potential/platinum-coated titanium electrode/Ti3Pt nanograins/ma-rine environment/long-term monitoring分类
化学化工引用本文复制引用
王泽,贾永刚,徐海波,芦永红..钛基铂涂层电极用于海洋氧化还原电位的长期监测[J].中国海洋大学学报（自然科学版）,2025,55(8):102-110,9.基金项目
国家重点研究发展计划项目(2022YFC2803800)资助 Supported by the National Key Research and Development Program of China(2022YFC2803800) （2022YFC2803800）
