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Round-trip oscillation triboelectric nanogenerator with high output response and low wear to harvest random wind energy

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Nano Research 2023年第8期16卷 11259-11268页

作者： Xinyu Hu Junrui Feng Chuangjian Liang Heng Ning Chunjin Chen Jiayu Li Honggui Wen Huilu Yao Lingyu Wan Guanlin Liu Guangxi Key Laboratory of electrochemical Energy Materials School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Beijing Institute of nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China

Triboelectric nanogenerator(TENG)has made significant progress in wind energy *** the most advantageous rotary TENG among wind energy harvesters,the severe material wear and the output that fluctuates with wind speed seriously hinder the application of TENG wind energy *** this study,we propose a round-trip oscillation triboelectric nanogenerator(RTO-TENG)consisting of a crank transmission mechanism and a power generation *** RTO-TENG utilizes a simple crank transmission mechanism combined with a zigzag-laminated triboelectric nanogenerator(Z-TENG)to achieve high-performance constant output and low material *** crank transmission mechanism can realize the transformation from circular motion to arc reciprocating motion,converting the random wind energy into bi-directional kinetic energy,driving the vertical contact and separation of the *** to the low transmission ratio(1:1)of the crank transmission mechanism and the consistent frequency of the Z-TENG contact–separation with that of the pendulum,the RTO-TENG’s power generation unit(10 Z-TENGs)is insensitive to changes in wind speed,resulting in a constant and stable output response at various *** 480,000 cycles,the output of RTO-TENG decreased by only 0.9%compared to the initial value of 6μC,and the scanning electron microscopy(SEM)images of the polytetrafluoroethylene(PTFE)film showed no significant wear on the surface of the friction layer,demonstrating excellent output stability and abrasion resistance of the RTO-TENG wind energy collector’s *** equipped energy management module,based on a gas discharge tube switch,can further enhance the output performance of the *** optimizing its inductor parameter L to match the load capacitor,it can charge a 220μF load capacitor to 13.4 V in 40 s,resulting in a 298%improvement in charging speed compared to the voltage of 4.48 V without the management ***,the RTO-TENG can efficiently provide power t

关键词： triboelectric nanogenerator wind energy harvesting round-trip oscillation structure bi-directional kinetic energy gas discharge tube switch

Inhibition behavior for copper corrosion by photoelectrochemical methods

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中国有色金属学会会刊：英文版 2003年第5期13卷 1226-1230页

作者：徐群杰周国定 electrochemical Research group Shanghai University of Electric Power Shanghai 200090China

The application of photoelectrochemical methods in the inhibition effects for copper corrosion was described. The methods include cyclic voltammetry photocurrent measurements, intensity modulated photocurrent spectrum(IMPS) and laser scanning photoelectrochemical microscopic method(PEM) which have been applied to the evaluation of inhibitors and inhibition behavior. The inhibition effect of BTA for copper corrosion is better than that of 4CBTA, 5CBTA, CBT 1, PTD, BT 250, CBTME and CBTBE at the same concentration. The inhibition mechanism of the derivatives of BTA with —COOH group(4CBTA, 5CBTA, CBT 1) is different from those with estergroup(CBTME, CBTBE).

关键词：铜腐蚀抑制剂光电化学光电流测量 BTA

Optimization of Information Interaction Protocols in Cooperative Vehicle-Infrastructure Systems

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Chinese Journal of Electronics 2018年第2期27卷 439-444页

作者： ZHANG Yuzhuo CAO Yuan WEN Yinghong LIANG Liang ZOU Feng School of Electronic and Information Engineering Beijing Jiaotong University Department of electrochemical Telecom Engineering Design Research The Third Railway Survey and Design Institute Group Corporation

This research investigate the information interaction protocols for Cooperative vehicleinfrastructure systems(CVIS) safety-related services and optimizes them in three aspects. It puts forward a selfadaptive back-off algorithm. This algorithm considers retransmission times and network busy degree to choose a suitable contention window. A mathematical analysis model is developed to verify its performance ***, different scenario models of Vehicle ad hoc network(VANET) are simulated through the network simulation tool and the influences of different access modes on Quality of Service(Qo S) are investigated. The simulation results have verified the improvement of the proposed algorithm is obvious and RTS/CTS access mode can sacrifice slight delay for great improvement of packet lost rate when there are large amount of vehicle nodes.

关键词： Cooperative vehicle-infrastructure systems(CVIS) Information interaction Network simulation

Silicon prepared by electro-reduction in molten salts as new energy materials

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Journal of Energy Chemistry 2020年第8期29卷 46-61,I0002页

作者： Tingting Jiang Xinyi Xu George Z.Chen The State Key Laboratory of Refractories and Metallurgy College of Materials and MetallurgyWuhan University of Science and TechnologyWuhan 430081HubeiChina electrochemical Technologies group Faculty of EngineeringUniversity of NottinghamNottingham NG27RDUK electrochemical Technologies group Faculty of Science and EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100ZhejiangChina

Silicon has a large impact on the energy supply and economy in the modern world. In industry, high purity silicon is firstly prepared by carbothermic reduction of silica with the produced raw silicon being further refined by a modified Siemens method. This process suffers from the disadvantages of high cost and contaminant release and emission. As an alternative, the molten salt electrolysis approach, particularly the FFC Cambridge Process(FFC: Fray-Farthing-Chen), could realize high purity silicon products with morphology-controllable nanostructures at low or mild temperatures(generally 650–900 ℃). In this article, we review the development, reaction mechanisms, and electrolysis conditions of silicon production by the FFC Cambridge Process. Applications of the silicon products from electrolysis in molten salts are also discussed in terms of energy applications, including using them as the photovoltaic element in solar cells and as the charge storage phase in the negative electrode(negatrode) of lithium ion batteries.

关键词： Electrolysis Molten salt Silicon Nanomaterial Li ion battery Solar cell

Single-atom catalysts for the electrochemical reduction of carbon dioxide into hydrocarbons and oxygenates

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Carbon Energy 2024年第3期6卷 64-117页

作者： Karl Adrian Gandionco Juwon Kim Lieven Bekaert Annick Hubin Jongwoo Lim Department of Chemistry Seoul National UniversitySeoulRepublic of Korea Research group electrochemical and Surface Engineering(SURF) Department of Materials and ChemistryVrije Universiteit BrusselBrusselsBelgium

The electrochemical reduction of carbon dioxide offers a sound and economically viable technology for the electrification and decarbonization of the chemical and fuel *** this technology,an electrocatalytic material and renewable energy-generated electricity drive the conversion of carbon dioxide into high-value chemicals and carbon-neutral *** the past few years,single-atom catalysts have been intensively studied as they could provide near-unity atom utilization and unique catalytic ***-atom catalysts have become one of the state-of-the-art catalyst materials for the electrochemical reduction of carbon dioxide into carbon ***,it remains a challenge for single-atom catalysts to facilitate the efficient conversion of carbon dioxide into products beyond carbon *** this review,we summarize and present important findings and critical insights from studies on the electrochemical carbon dioxide reduction reaction into hydrocarbons and oxygenates using single-atom *** is hoped that this review gives a thorough recapitulation and analysis of the science behind the catalysis of carbon dioxide into more reduced products through singleatom catalysts so that it can be a guide for future research and development on catalysts with industry-ready performance for the electrochemical reduction of carbon dioxide into high-value chemicals and carbon-neutral fuels.

关键词： electrocatalysis electrochemical CO_(2)reduction hydrocarbons oxygenates single-atom catalysts

electrochemical NOISE ANALYSIS OF PURE ALUMINUM IN SODIUM CHLORIDE SOLUTION WITH WAVELET TRANSFORM TECHNIQUE

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Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 272-278页

作者： Z. Zhang, Q.D. Zhong, J.Q. Zhang, Y.L. Cheng, F.H. Cao, J.M. and C.N. CaoDepartment of Chemistry, Zhejiang University, Hangzhou 310027, Chinaelectrochemical Research group, Shanghai University of Electric Power, Shanghai 200090, ChinaState Key Laboratory electrochemical Research group Shanghai University of Electric Power State Key Laboratory for Corrosion and Protection of Metals Institute of Metal Research The Chinese Academy of Sciences

Wavelet transforms (WT) are proposed as an alternative tool to overcome the limitations of Fourier transforms (FFT) in the analysis of electrochemical noise (EN) data. The most relevant feature of this method of analysis is its capability of decomposing electrochemical noise records into different sets of wavelet coefficients, which contain information about the time scale characteristic of the associated corrosion event. In this context, the potential noise fluctuations during the free corrosion of pure aluminum in sodium chloride solution was recorded and analyzed with wavelet transform technique. The typical results showed that the EN signal is composed of distinct type of events, which can be classified according to their scales, i.e. their time constants. Meanwhile, the energy distribution plot (EDP) can be used as 'fingerprints' of EN signals and can be very useful for analyzing EN data in the future.

关键词： electrochemical noise wavelet analysis Fourier transforms corrosion pure aluminum

Synergistic effect of phosphorus doping and MoS_(2) co-catalysts on g-C_(3)N_(4) photocatalysts for enhanced solar water splitting

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Journal of Materials Science & Technology 2023年第27期158卷 171-179页

作者： Xunfu Zhou Pai Wang Meng Li Minfu Wu Bei Jin Jin Luo Meifeng Chen Xiaoqin Zhou Yanning Zhang Xiaosong Zhou School of Chemistry and Chemical Engineering Key Laboratory of Clean Energy Materials Chemistry of Guangdong Higher Education InstitutesLingnan Normal UniversityZhanjiangGuangdong 524048China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731China electrochemical nanoenergy group School of Chemical Engineering and Light Industry at Guangdong University of TechnologyGuangzhou 510006China Department of Food Science Foshan Polytechnic Foshan 528137China

Carbon nitride(g-C_(3)N_(4))is a promising metal-free and visible-light-responsive ***,its photocatalytic efficiency still suffers from high recombination rates of photoinduced charge carriers,slow kinetics of surface redox reactions,and relatively poor light ***,a non-noble metal photocatalyst of MoS_(2) nanodots anchored on P-doped g-C_(3)N_(4) via in situ photodeposition was *** the synergetic effect of the P-doping and MoS_(2) co-catalyst,the as-prepared P-doped g-C_(3)N_(4)/MoS_(2) catalyst has achieved efficient photocatalytic overall water splitting with a hydrogen evolution rate of 121.7μmol h−1 g−*** results and Density functional theory(DFT)simulations indicate that the enhanced photo-absorption capacity originates from the reduced band gaps by P ***,the MoS_(2) reduces the overpotential of the water oxidation process and improves hydrogen adsorption capability in the hydrogen evolution *** work can pave a new avenue to design and develop noble-metal-free water-splitting photocatalysts for future large-scale applications.

关键词： Synergistic effect Noble-metal-free photocatalyst P-doping MoS_(2)co-catalyst Water splitting g-C_(3)N_(4)

Preparation and Magnetic Properties of Mn-Zn Ferrites by the Co-precipitation Method

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Journal of Wuhan University of Technology(Materials Science) 2009年第6期24卷 875-878页

作者：李雪张俊喜 School of Environmental and Chemical Engineering Shanghai University electrochemical Research group Shanghai University of Electric PowerKey Laboratory of State Power Corporation of China

Mn-Zn ferrites （Mn1-xZnxFe2O4） with different compositions were prepared by the coprecipitation method, and the influences of such synthesis conditions as pH value, composition and volume ratio （R） of the mixed solution and NH4HCO3 solution on their microstructures and magnetic properties were discussed. The samples were characterized by X-ray diffraction （XRD） and magnetization measurement instrument. Lattice parameters and average crystalline size of the synthesized materials were calculated from the corresponding XRD patterns with the related software Jade.5. For samples of different pH values, only one phase was found when pH values were 7.0, 8.0 and 9.0. The sample with pH value of 7.0 exhibited the highest saturation magnetic induction, the lowest coercive force, and crystallized best. For samples of different R values with pH value of 7.0, only one phase was observed in all samples, and the sample with R value of 2.3 exhibited the highest saturation magnetic induction and the lowest coercive force. The composition has mainly afected the magnetic properties, and the saturation magnetic induction increases with the increase of the content of Zn （x）, but decreases when x is beyond 0.6. The trend of coercive force is on the contrary. However, no magnetism is exhibited when the x value is up to 0.8.

关键词： co-precipitation method microstructure magnetic property Mn-Zn ferrite

Chemical Coupled PEDOT:PSS/Si Electrode: Suppressed Electrolyte Consumption Enables Long‑Term Stability

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Nano-Micro Letters 2021年第3期13卷 197-208页

作者： Xuejiao Liu Zhixin Xu Asma Iqbal Ming Chen Nazakat Ali CheeTongJohn Low Rongrong Qi Jiantao Zai Xuefeng Qian School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghai 200240P.R.China Warwick electrochemical Engineering group Energy Innovation CentreWMGUniversity of WarwickCoventry CV47ALUK

Huge volume changes of Si during lithiation/delithiation lead to regeneration of solid-electrolyte interphase(SEI)and consume *** this article,γ-glycidoxypropyl trimethoxysilane(GOPS)was incorporated in Si/PEDOT:PSS electrodes to construct a flexible and conductive artificial SEI,effectively suppressing the consumption of *** optimized electrode can maintain 1000 mAh g^−1 for nearly 800 cycles under limited electrolyte compared with 40 cycles of the electrodes without ***,the optimized electrode exhibits excellent rate *** use of GOPS greatly improves the interface compatibility between Si and PEDOT:*** Ar+etching depth analysis proved that the addition of GOPS is conducive to forming a more stable SEI.A full battery assembled with NCM 523 cathode delivers a high energy density of 520 Wh kg^−1,offering good stability.

关键词： Conductive binder PEDOT:PSS Cross-link XPS depth analysis Stable SEI Lithium-ion batteries