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In situ plasmonic & electrochemical fiber-optic sensor for multi-metal-ions detection

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Science China(Information Sciences) 2024年第1期67卷 292-302页

作者： Xiaoling PENG Zhiyong YANG Bo PENG Zhi LI Zhicong REN Xicheng WANG Jiahai LI Zhencheng LI Liang CHEN Daotong YOU Kaiwei LI Jianqing LI Tuan GUO Institute of Photonics Technology Jinan University School of Computer Science and Engineering Macau University of Science and Technology Institute for Environmental and Climate Research Jinan University Key Laboratory of Bionic Engineering of Ministry of Education Jilin University

High precision and high throughput detection of heavy metal ions is essential for water quality monitoring and ***,we propose a plasmonic & electrochemical dual-mode fiber sensing probe for label-free and real-time detection of multiple ions(Pb2+and Cu2+as examples).This sensor comprises a multimode fiber-single mode fiber reflection probe,the outer surface of which is coated with a gold nanofilm to excite the surface plasmon resonance(SPR) optically and simultaneously serves as an electrochemical working *** traditional electrochemical detection,the enrichment of ions cannot be detected in ***,by utilizing the plasmonic & electrochemical dual-mode detection method,various kinds of metal ions can be deposited onto the gold nanofilm and selectively oxidized during forward potential scanning,and the entire electrochemical process can be monitored by SPR *** experimentally demonstrate that the sensor can simultaneously detect Pb2+and Cu2+in a mixed solution in real-time,providing a linear response over the ion concentration range from 10-12to 10-7M and offering an excellent detection limit(1.69×10-14–5.49×10-13M).The proposed dual-mode fiber sensor has the benefits of remote sensing,compact footprint,and cost-effectiveness and shows excellent potential for water quality risk management in difficult-to-reach environments.

关键词： optical fiber sensor surface plasmon resonance electrochemical measurement ions detection water pollution

electrochemical measurementS OF COMPONENT ACTIVITIES IN METALLURGICAL SLAGS

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Acta Metallurgica Sinica(English Letters) 2003年第6期16卷 433-444页

作者： O.Volkova P.R.Scheller and D.Janke Institute of Iron and Steel Technology TU Bergakademie Freiberg D-09596 Freiberg GermanyInstitute of Iron and Steel Technology TU Bergakademie Freiberg D-09596 Freiberg Germany

The up-to-date status of FeO, CaO, SiO2, P2O5, Ti2O3 and Cr2O3 activity measurements in metallurgical slags using electrochemical sensors is outlined. A description of theoretical concepts and practical sensors is pre... 详细信息

关键词： electrochemical measurement sensor slag activity

electrochemical behavior of mesh and plate oxide coated anodes during zinc electrowinning

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Transactions of Nonferrous Metals Society of China 2016年第2期26卷 589-598页

作者：张伟 Michael ROBICHAUD Edward GHALI Georges HOULACHI 湖南工业大学冶金工程学院株洲412007 Department of Mining Metallurgy and Material EngineeringLaval UniversitySte-FoyQuebec G1K 7P4 Canada Hydro-Quebec Research Center Shawinigan Quebec G9N 7N5 Canada

The catalytic performance of two oxides coated anodes （OCSs） meshes and one OCA plate was investigated in a zinc electrowinning electrolyte at 38 ℃. Their electrochemical behaviors were compared with that of a conventional Pb-0.7%Ag alloy anode. electrochemical measurements such as cyclic voltammetric, galvanostatic, potentiodynamic, open-circuit potential （OCP） and in situ electrochemical noise measurements were considered. After 2 h of OCP test, the linear polarization shows that the corrosion current density of the Ti/（IrO2-Ta2O5） mesh electrode is the lowest （3.37μA/cm^2） among the three OCAs and shows excellent performance. Additionally, after 24 h of galvanostatic polarization at 50 mA/cm^2and 38 ℃, the Ti/MnO2mesh anode has the highest potential （1.799 V）, followed by the Ti/（IrO2-Ta2O5） plate （1.775 V） and Ti/（IrO2-Ta2O5） mesh （1.705 V） anodes. After 24 h of galvanostatic polarization followed by 16 h of decay, the linear polarization method confirms the sequence obtained after 2 h of OCP test, and the Ti/（IrO2-Ta2O5） mesh attains the lowest corrosion current density. The Ti/（IrO2-Ta2O5） mesh anode also shows better performance after 24 h of galvanostatic polarization with the overpotential lower than that of the conventional Pb-Ag anode by about 245 mV.

关键词： oxides coated anode mesh plate electrochemical measurement electrochemical behavior

Simultaneous electrochemical Determination of Ascorbic Acid, Dopamine and Uric Acid Based on Reduced Graphene Oxide-Ag/PANI Modified Glassy Carbon Electrode

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Chemical Research in Chinese Universities 2017年第3期33卷 507-512页

作者： GUO Zhuo LUO Xianke LI Yahui LI Dongdi ZHAO Qinai LI Mengmeng MA Chi ZHAO Yanting Department of Materials Science and Enginee~qng Shenyang University of Chemical Technology Shenyang 110142 R R. China Shenzhen Graduate School of Harbin Institute of Technology Shenzhen 518055 R R. China

An electrochemical method for simultaneous determination of ascorbic acid（AA）, dopamine（DA） and uric acid（UA） was developed based on RGO-Ag/PANI modified glassy carbon electrode（RGO-Ag/PANI/GCE, RGO= reduced graphene oxide, PANI=polyaniline）. Owing to the synergetic effect among RGO, Ag and PANI, the RGO-Ag/PANI based sensor not only improved the electrochemically catalytic oxidation ofAA, DA and UA, but also resolved the overlapping anodic peaks. Under the optimized conditions, the calibration curves were obtained in the concentration ranges of 50--1000, 5--200 and 20--350 ttmol/L, and the detection limits（S/N=3） of 0.5, 0.2 and 0.2 ~tmol/L were obtained for AA, DA, and UA, respectively, in neutral phosphate buffer solutions（PBS）. The RGO-Ag/PANI/GCE sensor was successfully applied to the determination of AA, DA, and UA in bovine serum samples and showed high selectivity, sensitivity, and reproducibility.

关键词： Dopamine Uric acid Ascorbic acid electrochemical measurement

Properties of passive nano films on zircaloy-4 affected by defects induced by hydrogen permeation

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Chinese Physics B 2014年第8期23卷 154-159页

作者：顾俊骥凌云汉张瑞谦戴训白新德 School of Materials Science and Engineering Tsinghua University Reactor Fuel and Materials Laboratory Nuclear Power Institute of China

In this work, hydrogen absorption and the permeation behavior of the passive layer formed on zircaloy-4 are in- vestigated. Potentiodynamic polarization, Mott-Schottky analysis, electrochemical impedance spectroscopy, and Raman scattering spectroscopy are employed to characterize the passive defects before and after hydrogen permeation. It is found that the nanoscale passive ZrO2 films play an important role in the resistance against corrosion; hydrogen impingement, however, reduces the passive impedance towards hydrothermal oxidation. The increase of defects （vacancies） in passive film is probably attributed to the degradation. We believe that this finding will provide valuable insight into the understanding of the corrosion mechanism of zircaloys used in light water reactors.

关键词： zircaloy defects hydrogen permeation electrochemical measurement

Understanding the role of alloyed Ni and Cu on improving corrosion resistance of low alloy steel in the simulated Beishan groundwater

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Journal of Materials Science & Technology 2022年第35期130卷 124-135页

作者： Yupeng Sun Xin Wei Junhua Dong Nan Chen Hanyu Zhao Qiying Ren Wei Ke School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The corrosion behavior of NiCu low alloy steel and Q235 low carbon steel as the candidate materials for geological disposal containers of high-level radioactive waste in the simulated Beishan groundwater was comparatively studied by weight loss test,electrochemical measurements,scanning electron microscope(SEM),electron probe microanalysis(EPMA),X-ray diffraction(XRD),Raman spectrum and X-ray photoelectron spectroscopy(XPS).The electrochemical results showed that the corrosion potential of NiCu steel and Q235 steel gradually increased with the immersion ***,the cathodic process transited from hydrogen evolution reaction(HER) control to the rust reduction control,while the anodic process was always dominated by the active dissolution of *** comparison,both the cathodic resistance and the anodic dissolution resistance of NiCu steel corrosion were apparently higher than that of Q235 *** results of rust layer characterization indicated that Ni and Cu elements could be enriched in the inner rust layer of NiCu steel and the rust layer was more *** the main corrosion products,the content of α-FeOOH in the rust layer of NiCu steel was obviously increased more than that of Q235 ***_(6)(OH)_(12)SO_(4)stably existed in the corrosion products of NiCu steel because Ni(Ⅱ) or Cu(Ⅱ)could substitute Fe(Ⅱ) of Fe_(6)(OH)_(12)SO_(4)and increased its oxidation resistance,Moreover,Ni and Cu could also make Fe3O4ionic selective by *** the long-term immersion,the corrosion mass loss of NiCu steel was significantly lower than Q235 steel,which further confirmed the benefits of Ni and Cu alloying on improving the steel corrosion resistance.

关键词： Deep geological disposal Container material Groundwater Corrosion behavior electrochemical measurement

Corrosion behavior of T2 copper in 3.5% sodium chloride solution treated by rotating electromagnetic field

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Transactions of Nonferrous Metals Society of China 2016年第5期26卷 1439-1446页

作者：张鹏朱强苏倩郭斌程树康哈尔滨工业大学(威海)材料科学与工程学院威海264209 哈尔滨工业大学材料科学与工程学院哈尔滨150001 哈尔滨工业大学电磁与电子技术研究所哈尔滨150001

Copper is susceptible to producing corrosion problems in corrosive environments, which leads to serious safety problems. Thus, investigating the corrosion behavior of copper is of great significance. The effects of rotating electromagnetic field on corrosion behavior of T2 copper in 3.5% sodium chloride solution with electrochemical measurements were investigated. The results showed that rotating electromagnetic field changed properties of 3.5% sodium chloride solution by increasing the values of temperature and pH and decreasing the values of conductivity and dissolved oxygen. The rotating electromagnetic field improved the corrosion resistance of T2 copper. The corrosion products of T2 copper in treated 3.5% sodium chloride solution were composed of Cu20 and CuCl. The low corrosion rate of T2 copper was resulted from the decrease of dissolved oxygen in 3.5% sodium chloride solution treated by rotating electromagnetic field.

关键词： corrosion behavior rotating electromagnetic field electrochemical measurement copper

Triazole derivatives as corrosion inhibitors for mild steel in hydrochloric acid solution

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Acta Metallurgica Sinica(English Letters) 2009年第4期22卷 247-254页

作者： Fengling XU Baorong HOU Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

The title compounds 1-（4,5-dihydro-3-phenyl pyridine-1-yl）-2-（1H-1,2,4-triazole-1-yl） ethyl ketones were studied as a corrosion inhibitor in a mild steel in 1 mol /L hydrochloric acid solution using weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy （EIS）. Results indicated that these compounds had excellent inhibition properties. Polarization curves indicated that the inhibitor behaved mainly as mixed-type inhibitor. The EIS results showed that the charge transfer controlled the corrosion process in the uninhibited and inhibited solutions. Adsorption of the inhibitor on the mild steel surface followed Langmuir＇s adsorption isotherm with negative value of the free energy of adsorption ΔGads^o. The thermodynamic parameters of adsorption were determined and discussed.

关键词： Materials protection Acid inhibitor Triazole-type compound electrochemical measurement

Corrosion Behavior of High Performance Offshore Platform Steel with Chromium and Nickel Addition in the Environment Containing Chloride Ions

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Journal of Iron and Steel Research International 2015年第6期22卷 496-505页

作者： Yan-lei ZHOU Xiang-jun ZHANG Tao JIA Zhen-yu LIU State Key Laboratory of Rolling and Automation Northeastern University

The characterization of corrosion products formed on a high performance offshore platform steel in the en- vironment containing chloride ions has been investigated by scanning electron microscopy （SEM）, X ray diffraction （XRD）, electron probe microanalysis （EPMA） and electrochemical impedance spectroscopy （EIS）. The results re- veal that the corrosion process can be divided into the initial stage and the later stage. The main constituents of rust layers are c~ FeOOH, 13-FeOOH, y-FeOOH, Fe：^（）~ and large amounts of amorphous compounds. With increasing corrosion time, the mass fraction of a-FeOOH and Fe：~ O,, increased, while that of y-FeOOH and ^-FeOOH changed slightly. The enrichment of Cr and Ni at the inner/outer interface, especially the side of inner rust, can be observed in the later corrosion stage of Cr Ni steel, which can promote the formation of compact inner rust layer, impeding the transmission of corrosion mediums and slowing down the electrochemical reaction process.

关键词： offshore platform steel alloying element corrosion resistance rust layer electrochemical measurement