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Recent Progress in Carbon-based Materials of Non-Noble Metal Catalysts for ORR in acidic environment

Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 885-899页

作者： Jie Lian Jin-Yu Zhao Xiao-Min Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of New Energy Materials and Devices Taiyuan University of TechnologyTaiyuan 030024China

Proton exchange membrane fuel cell(PEMFC)has important implications for the success of clean transportation in the *** of the key factors affecting the cost and performance of PEMFC is the cathode electrocatalyst for the oxygen reduction reaction(ORR)to overcome sluggish kinetics and instability in an acidic *** an essential component of the electrocatalyst,the support material largely determines the activity,mass transfer,charge transfer,and durability of the ***,the support material plays a critical role in the overall performance of the *** materials are widely used as electrocatalyst supports because of their high porosity,conductivity,chemical stability,and tunable ***,some new carbon-based materials with excellent structure have been introduced,such as carbon nanotubes,carbon nanowires,graphene,metal-organic framework(MOF)-derived carbon,and biomass-derived carbon *** with a variety of strategies,such as controllable construction of porous structures and surface defects,proper doping heteroatoms,the ingenious design of model electrocatalysts,and predictive theoretical calculation,a new reliable path was provided for further improving the performance of electrocatalysts and exploring the catalytic *** on the topic of carbon-based materials for ORR in acidic medium,this review summarizes the up-to-date progress and breakthroughs,highlights the factors affecting the catalytic activity and stability of ORR electrocatalysts in acids,and discusses their future application and development.

关键词： Carbon-based materials Non-noble metal electrocatalysts acidic environment Oxygen reduction reaction Proton exchange membrane fuel cell

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Controllable photodynamic performance via an acidic microenvironment based on two-dimensional metal-organic frameworks for photodynamic therapy

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Nano Research 2021年第3期14卷 660-666页

作者： Lifeng Hang Tao Zhang Hua Wen Lianbao Liang Wuming Li Xiaofen Ma Guihua Jiang The Department of Medical Imaging Guangdong Second Provincial General Hospital Guangzhou518037China The Second School of Clinical Medicine Southern Medical UniversityGuangzhou518037China University of Science and Technology of China Hefei230027China

Photodynamic therapy(PDT)is a widely-used technology for cancer therapy,but conventional photosensitizers still face some drawbacks,such as hydrophobicity,inadequate pharmacokinetics,low cell/tissue specificity,and uncontrollable photodynamic performance during the therapeutic ***,we present a controllable photodynamic performance based on two-dimensional metal-organic frameworks(2D Zn-TCPP MOF)that displayed a week PDT effect under a neutral environment upon exposure to a 660 nm laser due to the degeneracy of Q bands of ***,the 2D Zn-TCPP MOF showed a significantly enhanced PDT effect in an acidic environment under irradiation with a 660 nm laser due to the released TCPP from decomposed MOF *** the in vitro outcomes,the 2D Zn-TCPP MOF showed controllable photodynamic performance from neutral to acidic *** to the acidic tumor microenvironment,the 2D Zn-TCPP MOF presented the strongest antitumor effect in vivo under irradiation with a 660 nm *** work offers a promising strategy to develop a next-generation photosensitizer.

关键词： photodynamic therapy metal-organic frameworks tetrakis(4-carboxyphenyk)porphyrin acidic environment

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Corrosion Rate of Hydrogenation to C110 Casing in High H_2S environment

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1081-1083页

作者：张智 LI Changjin ZHANG Jiyin SHI Tahe State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Engineering Technology Institute of Southwest Petroleum Branch SINOPECDeyang 610016China

The corrosion behavior of C110 bushing at high temperature and high pressure with a high H2S / CO2 was studied, and a basis for the materials selection of sour gas well bushing was provided in H2S, CO2 and saline coexisting environment. Under acidic condiction, hydrogen atoms greatly entered into the material and caused the material properties changed. Weight loss method was used to study the corrosion rate of hydrogen charging samples and original untreated samples in simulated oil field environment. PAR2273 electrochemical workstation was used to examine the electrochemical performance of samples untreated, hydrogen charging after reacting in autoclave. The corrosion product film was observed through SEM. The experimental results show that sample with hydrogen charging has a much more obvious partial corrosion and pitting corrosion than the untreated blank sample even the downhole corrosion speed of bushing is increased after being used for a period of time. Polarization curve shows the corrosion tendency is the same between sample with or without hydrogen charging and corrosion tendency is reduced by corrosion product film. A layer of dense product film formed on the surface of samples provides a certain protective effect to the matrix, but cracked holes which will accelerate partial corrosion of the sample were also observed.

关键词： electrochemical hydrogen charging H28/CO2 weightlessness oil casing electrochemicalproperties high temperature and high pressure acidic environment

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Mechanical Characteristics and Mechanism of Granite Subjected to Coupling Effect of acidic Corrosion and Freeze-Thaw Cycles

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Journal of Earth Science 2021年第5期32卷 1202-1211页

作者： Suran Wang Youliang Chen Jing Ni Guanlin Liu Tomas Manuel Fernandez-Steeger Chao Xu Department of Geotechnical Engineerings Tongji University Shanghai 200092China Department of Civil Engineerings University of Shanghai for Science and Technology Shanghai 200093China Institute for Applied Geosciences Technical University of BerlinBerlin 10587Germany

The typical climatic and environmental conditions in Central Asia are major natural factors causing local rock masses to face considerable risks of damage due to constant freeze-thaw cycles. In addition, these are exacerbated by the dense acidic environments in certain industrialized areas, such as Northern Sinkiang, China. To provide local engineering design with workable solutions, it is crucial to analyze the mechanical performance of rock masses and its mechanisms under the coupling action of corrosive acid and freeze-thaw cycles. In this study, granite samples from the northern Tien Shan Mountains near Urumchi, Xinjiang Province, as well as two kinds of sandstone samples for comparison, were subjected to different soaking conditions, including nitric acid soaking at various pH values. One or both of the freeze-thaw cycle tests and uniaxial compression test were then executed. Speculations regarding the mechanism of the performance of granite rock masses under the action of corrosive acid and freeze-thaw cycles were developed based on the results of these tests. X-ray diffraction and scanning electron microscopy were implemented to demonstrate the feasibility of the speculated mechanism. In this paper, the identification of the white crumb-like substance as SiO_(2) gel were confirmed.

关键词： granite sandstone acidic environment freeze-thaw cycle test XRD SEM

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