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Passivation Mechanism of 316L Stainless Steel in Oxidizing Acid Solution

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International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 204-208页

作者： Xuanyi Wang, yinshun wu, lin zhang, Baofeng Ding (corrosion and protection Centre, university of science and technology beijing, beijing 100083, china) corrosion and protection Centre University of Science and Technology Beijing Beijing 100083 China

The compositions and the chemical valence states of elements of 316L stainless steel passive film formed in the oxidizing acid solution were studied by X-ray Photoelectron Spectroscopic (XPS) analysis. The electrochemical polarization curve was measured. The passivation process in the oxidizing acid solution was studied by AC impedance technology. The results indicated that the stable compounds layer was formed on the surface of the sample and the adsorption was the main step in the nitrite solution during passivation process. The catalysis passivation mechanism was put forward according to the experimental results. During passivation process, the water molecule was adsorbed on the surface of the sample at first in the oxidizing acid solution. The oxidizer in the solution played a role as catalyst. The oxide and hydroxide, which could be changed each other and finally formed stable passive film, were generated from adsorbing intermediate under the catalytic action. The mathematical models for predicting the steady polarization curve and the AC impedance spectra at certain conditions have been obtained. The passivation mechanism of 316L stainless steel in the oxidizing acid solution can be interpreted by the catalysis passivation mechanism.

关键词： 316L stainless steel passive film XPS AC impedance spectra passivation mechanism

Polysulfide modified PtCu intermetallic nanocatalyst with enrichment realizes efficient electrooxidation ethanol to CO_(2)

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Nano Research 2024年第4期17卷 2320-2327页

作者： Shuanglong Zhou Zheng Lv liang Zhao Dan zhang Zuocao Wang Yu Dai Bin li Olga Starostenko jianping Lai Lei Wang Key Laboratory of Eco-chemical Engineering Ministry of EducationTaishan scholar advantage and characteristic discipline team of Eco-chemical process and technologyLaboratory of Inorganic Synthesis and Applied ChemistryCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Foreign Languages Qingdao City UniversityQingdao 266106China College of Materials science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Institute of Macromolecular Chemistry of the National Academy of sciences of Ukraine Kyiv 02160Ukraine Shandong Engineering Research center for Marine Environment corrosion and Safety protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

The main problem faced by ethanol oxidation reaction(EOR)includes low activity,poor selectivity,and *** the study,we found that polysulfide modified on the surface of PtCu intermetallic(IM)/C can simultaneously enrich hydroxyl and ethanol,which could effectively improve the catalytic activity,CO_(2) selectivity,and durability of *** mass activity and the specific activity of the product in 1 M KOH electrolyte reached 17.83 A·mgPt^(-1) and 24.67 mA·cm^(-2).The CO_(2) selectivity of polysulfide modified product achieved 93.5%,which was 30 folds higher than Pt/*** addition,the catalyst showed high catalytic *** mechanism study demonstrates that the surface modified polysulfide could significantly boost the enrichment effect of ethanol and hydroxyl species,accelerating C–C bond cleavage and CO oxidation.

关键词： Pt CO_(2) selectivity enrichment effect ethanol oxidation reaction(EOR) electrocatalyst

Effect of HCO_3^- concentration on CO_2 corrosion in oil and gas fields

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Journal of university of science and technology beijing 2006年第1期13卷 44-49页

作者： Guoan zhang Minxu Lu Chengwen Chai yinshun wu corrosion and protection center University of Science and Technology Beijing Beijing 100083 China

The effect of HCO3^- concentration on CO2 corrosion was investigated by polarization measurement of potentiodynamic scans and weight-loss method, Under the conditions of high pressure and high temperature, the corrosion rate of steel X65 decreased with the increase of HCO3^- concentration, while pH of solution increased. SEM, EDS, and XRD results of the corrosion scales indir cated that the typical FeCO3 crystallite was found at low HCO3^- concentration but Ca（Fe,Mg）（CO3）2 was found at high HCO3^- con- centration. Ca^2＋ and Mg^2＋ are precipitated preferential to Fe^2＋ at high pH value. Potentiodynamic polarization curves showed that the cathodic current density decreases with the increase of HCO3^- concentration at low HCO3^- concentration. When the HCO3^- concentration reaches 0.126 mol/L, increasing HCO3^- concentration promotes cathodic reactions. Anodic behavior is an active process at low HCO3^- concentration and the anodic current density decreases with the increase of HCO3^- concentration. An evident active-passive behavior is exhibited in anodic process at 0.126 mol/L HCO3^-.

关键词： oil and gas fields carbon dioxide corrosion bicarbonate concentration polarization curves

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不锈钢钝化膜表面形貌的表征

金属功能材料 1999年第5期6卷 221-224页

作者：汪轩义吴荫顺张琳丁宝峰北京科技大学腐蚀与防护中心腐蚀磨蚀与表面技术开放研究实验室北京100083

运用原子力显微镜（AFM）观察了316L不锈钢表面钝化处理前后的形貌，引入表面粗糙度的概念，获得了不锈钢钝化处理前的抛光试样表面粗糙度为1.54nm，抛光试样经钝化处理后表面粗糙度为0．352nm．

关键词：钝化膜表面形貌粗糙度原子力显微镜不锈钢

Amorphous/2H-MoS_(2) nanoflowers with P doping and S vacancies to achieve efficient pH-universal hydrogen evolution at high current density

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science china Chemistry 2022年第9期65卷 1829-1837页

作者： Yue Shi Dan zhang Hongfu Miao Xueke wu Zuochao Wang Tianrong Zhan jianping Lai Lei Wang Key Laboratory of Eco-chemical Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry of Life ScienceTaishanScholar Advantage and Characteristic Discipline Team of Eco Chemical Process and TechnologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research center for Marine Environment corrosion and Safety protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

Molybdenum disulfide(MoS_(2))has become a competitive candidate for efficient and economical hydrogen evolution reaction(heR).Compared with 1T-MoS_(2),2H-MoS_(2) possesses exceptional thermodynamic stability but still suffers from low active site density,poor conductivity,and weak hydrogen bonding in the wide pH ***,2H-MoS_(2) nanoflowers with phosphorus doping,sulfur vacancies and crystalline-amorphous heterojunction were synthesized via phosphorus-assisted rapid calcination *** from the cooperative interaction of multiple strategies,the prepared 2H-MoS_(2) nanoflowers firstly achieve efficient pH-universal heR at high current *** results show that in alkaline,acidic,and neutral media,MoS_(2)-P2 requires only 332,302,and 417 mV to drive the current density of 500 mA cm^(−2) and obtains 932,1100,and 472 mA cm^(−2) at the potential of−0.4 V ***,***,MoS_(2)-P2 shows excellent stability of low and high current density in the full pH range.

关键词： MoS_(2)nanoflowers defects dopants heterojunction hydrogen evolution reaction

Ultra-fast phosphating synthesis of metastable crystalline phase-controllable ultra-small MPX/CNT(M = Pd, Pt, Ru) for polyalcohol electrooxidation

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Journal of Energy Chemistry 2022年第9期31卷 108-115,I0004页

作者： Yan zhang Dan zhang Yingnan Qin Juan Xiong Jiao liu Wenhao Yu Xilei Chen Suping li jianping Lai Lei Wang Key Laboratory of Eco-chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and TechnologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Shandong Engineering Research center for Marine Environment corrosion and Safety protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina library Qingdao University of Science and TechnologyQingdao 266042ShandongChina

A general approach is reported for ultra-fast phosphating synthesis of a series of ultra-small(<5 nm)noble metal phosphides(MPX/CNT,M=Pd,Pt,Ru)which are successfully produced in just 75 s for the first *** catalytic p... 详细信息

A general approach is reported for ultra-fast phosphating synthesis of a series of ultra-small(he first *** catalytic performance of the catalysts can be optimized by controlling the nanomaterials as the metastable crystalline *** altering the phosphorus source under the same conditions,the hexagonal structured Pd_(7)P_(3)(NaH_(2)PO_(2).H_(2)O as P source)and monoclinic structured Pd_(6)P(Na_(4)P_(2)O_(7) as P source)can be prepared *** of them exhibit excellent polyol oxidation performance in alkaline *** Pd_(6)P/CNT and hexagonal Pd_(7)P_(3)/CNT have large ECSA which are confirmed as 82.1 m2 g^(-1)and 86.2 m2 g^(-1),*** Pd_(7)P_(3)/CNT has the highest mass activity of 6.14 A mgPd^(-1)(3.21 A mgPd^(-1)for Pd_(6)P/CNT)for GOR,which far exceeded Pt/C(2.81 A mgPt^(-1)).Meanwhile,the mass activity of monoclinic Pt_(5)P_(2)/CNT for EGOR achieved 12.4 A mg_(Pt)^(-1),which far exceeded Pt/C(6.8 A mg_(Pt)^(-1)).The stability test proved that the activity decay of these catalysts was negligible after the 12-hour durability ***,they have excellent CO anti-poisoning abilities.

关键词： General synthesis Metastable crystalline phase Ultra-small nanoparticles Electrocatalysis

Noble metal aerogels rapidly synthesized by ultrasound for electrocatalytic reaction

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Chinese Chemical Letters 2022年第4期33卷 2021-2025页

作者： Yueyue Yuan Huan Zhao Wenxia Xv Dan zhang Zuochao Wang Hongdong li Yingnan Qin Shaoxiang li jianping Lai Lei Wang Key Laboratory of Eco-chemical Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry of Life ScienceTaishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and TechnologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research center for Marine Environment corrosion and Safety protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

Noble metal aerogels(NMAs), belonging to the porous material, have exhibited excellent catalytic performance. Although the synthesis method continues to improve, it still exists some problems which hindered the experimental process, such as high concentration of noble metal precursors, long synthesis cycle, expensive production cost, and uncontrollable ligament length. In this work, ultrasonic wave and reducing agent Na BH;were simultaneously applied to gelation process. With the cavitation of ultrasound,it can generate huge energy with heating and stirring, thus gelation reaction proceeded quickly, and even completed the process in only a few seconds, that is much faster than the recorded. A wide concentration range was successfully expanded from 0.02 mmol/L to 62.5 mmol/L. Further, we extended this method to a variety of noble metal elements(Au, Ru, Rh, Ag, Pt, Pd), and this method is adaptive for the synthesis of single metal aerogels(Au, Ag, Ru, Rh, Pd), bimetal and trimetal aerogels(Au-Ag, Au-Rh, Au-Ru, Au-Pt,Au-Pd, Au-Pt-Pd). In addition, the ligament size of alloy aerogels are 10 nm or less. Moreover, their brilliant properties were demonstrated in hydrogen evolution reaction(heR) and ethanol oxidation reaction(EOR).

关键词： Ultrasonic Aerogels Noble metals Rapid synthesis Electrocatalysis

Superfast tellurizing synthesis of unconventional phase-controlled small Pd-Te nanoparticles

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science china Materials 2022年第7期65卷 1853-1860页

作者： Yi Han Yanyun zhang Xinyi zhang Yuyao Sun Wenwen Cai Zhenjiang li jianping Lai Lei Wang Key Laboratory of Eco-Chemical Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry of Life ScienceTaishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and TechnologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research center for Marine Environment corrosion and Safety protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials science and Engineering Qingdao University of Science and TechnologyQingdao 266042China

Large-scale production of unconventional phase-controlled telluride catalysts in a simple and fast manner still poses a great ***,we develop a superfast tellurizing synthesis method that can quickly prepare unconventional phase-controlled palladium telluride nanoparticles(Pd-Te NPs)on carbon nanotubes(CNTs)(i.e.,PdTe/CNT,Pd_(20)Te_(7)/CNT)in 60 *** merely tuning the mass of the tellurium precursors under the same conditions,fine(about 5.5 nm)and high-yield(about 90%)hexagonal structured PdTe/CNT and rhombohedral structured Pd_(20)Te_(7)/CNT can be precisely *** hexagonal structured PdTe/CNT exhibits excellent performance for glycerol oxidation reaction(GOR)and ethylene glycol oxidation reaction(EGOR).Specifically,the highest current density for GOR is 2.72 A mgPd^(-1),which is 1.9-fold higher than that of rhombohedral structured Pd_(20)Te_(7)/CNT,and 2.8-fold higher than that of Pd/*** also outperforms most catalysts reported in ***,the specific activity for EGOR is 3.65 A mgPd^(-1),which is 2.1 and 3.9 times higher than those of rhombohedral structured Pd_(20)Te_(7)/CNT and Pd/*** hope that this work can provide guidance for the preparation of crystalline phase-controlled telluride catalysts via new tellurization and inspire the application of crystalline phasecontrolled materials.

关键词： scalable production phase-controlled catalysts telluride fuel cell

Scalable synthesis of ultra‐small Ru_(2)P@Ru/CNT for efficient seawater splitting

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Chinese Journal of Catalysis 2022年第4期43卷 1148-1155页

作者： Dan zhang Hongfu Miao Xueke wu Zuochao Wang Huan Zhao Yue Shi Xilei Chen Zhenyu Xiao jianping Lai Lei Wang Key Laboratory of Eco‐Chemical Engineering Key Laboratory of Optic‐electric Sensing and Analytical Chemistry of Life ScienceTaishan Scholar Advantage and Characteristic Discipline Team of Eco‐Chemical Process and TechnologyQingdao University of Science and TechnologyQingdao 266042ShandongChina Shandong Engineering Research center for Marine Environment corrosion and Safety protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina

In this study,an ultra‐fast and simple solvent‐free microwave method was successfully demonstrated using a series of ultra‐small(~2.5 nm)surfactant‐free Ru_(2)P@Ru/CNT heterostructures for the first *** structure has a high‐density Ru component and Ru_(2)P component interface,which accelerates the hydrogen evolution reaction(heR).The prepared Ru_(2)P@Ru/CNT demonstrated excellent catalytic effects for the heR in alkaline media and real *** experimental results indicate that ratio‐optimized Ru_(2)P@Ru/CNT(Ru_(2)P:Ru=66:34)requires only 23 and 29 mV to reach 10 mA cm^(-2)in 1.0 mol/L KOH and real seawater,*** values are 10 and 24 mV lower than those of commercial Pt/C in 1.0 mol/L KOH(33 mV)and real seawater(53 mV),respectively,making it among the best non‐Pt heR reported in the ***,the TOF of Ru_(2)P@Ru/CNT in alkaline freshwater and seawater were 13.1 and 8.5 s^(-1),*** exceed the corresponding values for Pt/C,indicating that the catalyst has excellent intrinsic *** high current activity of Ru_(2)P@Ru/CNT in 1.0 mol/L KOH was explored,and only 77 and 104 mV were required to reach 500 and 1000 mA cm^(-2),*** 100 h of durability testing,the catalyst retained excellent catalytic and structural stability in low current density,high current density,and seawater.

关键词： Ultra‐small nanoparticles Phosphide Multi‐interface Solvent‐free microwave method Seawater splitting