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Experimental and Theoretical Study on Thermal Stability of Mixture R1234ze(E)/R32 in Organic Rankine Cycle

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Journal of Thermal Science 2023年第4期32卷 1595-1613页

作者： LIU Jinyu LIU Yu LIU Chao XIN Liyong YU Wei Key Laboratory of Low-Grade energy Utilization Technologies and systems Ministry of EducationSchool of Energy and Power EngineeringChongqing UniversityChongqing400030China

The use of Organic Rankine Cycle(ORC)for renewable energy utilization and industrial waste heat recovery is currently attracting growing *** working fluids in ORC may face thermally decompose during the working *** thermal stability and pyrolysis mechanism of R1234ze(E)/R32 mixtures was studied by ReaxFF-MD simulations and DFT *** experimental results indicated that the pyrolysis temperature range is 230℃-250℃ for R1234ze(E),270℃-290℃ for R32 and 230℃-250℃ for R1234ze(E)/R32 *** cleavage of C-H,C-C bond is the main decomposition pathway of pure R32,R1234ze(E),*** decomposition rate of R32 is significantly slower than that of R1234ze(E).In the mixture R1234ze(E)/R32,R1234ze(E)can significantly promote the decomposition of R32,while R32 has a slight inhibitory effect on the decomposition of R1234ze(E).The CF3 radicals generated by the decomposition of R1234ze(E)significantly reduced the energy barrier of R32 decomposition and promoted the decomposition rate of *** H and F radical in the system is more inclined to react with R32 than R1234ze(E)due to their lower energy *** increase of the pressure and mass ratio of R1234ze(E)in the mixture system has a great promoting effect on the pyrolysis of the mixtures.

关键词： R1234ze(E)/R32 pyrolysis ReaxFF-MD DFT

A mild, configurable, flexible CoNi-LDH（v）/Zn battery based on H-vacancy-induced reversible Zn2+ intercalation

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Journal of energy Chemistry 2025年第1期100卷 498-508页

作者： Xinyue Cheng Dingsheng Wu Hao Gao Qingqing Wang Pengfei Lv Sam S.Yoon Qufu Wei Key Laboratory of Eco-textiles Ministry of Education Jiangnan University school of Mechanical Engineering Korea University

Flexible Zn-based batteries have attracted increasing research interest as essential components of wearable energy storage ***,the advancement of flexible aqueous Zn-based batteries based on Co-Ni layered double hydroxide （CoNi-LDH） as the cathode material is hampered by their poor cycling stability and the corrosiveness of alkaline ***,CoNi-LDH nanosheets enriched with H vacancies (CoNi-LDH（v）) were constructed on a flexible carbon cloth （CC） substrate via electrochemical deposition and *** Zn-based battery comprising CoNi-LDH（v）@CC as the cathode exhibited highly reversible conversion reactions and stable operation in 3 M ZnSO4electrolyte （pH=4）.The battery delivered an excellent specific capacity (225 mA h g-1,0.26 mA h cm-2),acceptable cycling stability（53.9%,900 cycles）,and high discharging *** abundant H vacancies served as active sites for the reversible intercalation of Zn2+and the extravasation of NO3-generated channels and space for Zn2+transport and storage,together enabling an excellent Zn2+storage ***,a sandwich-structured solid-state CoNi-LDH（v）@CC//Zn@CC battery was fabricated and was found to exhibit a noteworthy electrochemical performance and mechanical *** a proof of concept,the unencapsulated battery powered a digital watch under various deformation conditions and operated stably for 80 ***,the flexible battery displayed outstanding customizability,maintaining an open-circuit voltage of 1.42 V even after being cut *** proposed engineering strategy contributes to the realization of textiles with truly wearable energy-storage devices.

关键词： CoNi/Zn battery H vacancies Mild aqueous electrolyte Tailorable battery Wearable energy storage device

Remaining Life Prediction Method for Photovoltaic Modules Based on Two-Stage Wiener Process

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energy Engineering 2025年第1期122卷 331-347页

作者： Jie Lin Hongchi Shen Tingting Pei Yan Wu school of Electrical Engineering and Information Engineering Lanzhou University of TechnologyLanzhou730050China

Photovoltaic (PV) modules, as essential components of solar power generation systems, significantly influence unitpower generation *** service life of these modules directly affects these costs. Over time, the performanceof PV modules gradually declines due to internal degradation and external environmental *** cumulativedegradation impacts the overall reliability of photovoltaic power generation. This study addresses the complexdegradation process of PV modules by developing a two-stage Wiener process model. This approach accountsfor the distinct phases of degradation resulting from module aging and environmental influences. A powerdegradation model based on the two-stage Wiener process is constructed to describe individual differences inmodule degradation processes. To estimate the model parameters, a combination of the Expectation-Maximization(EM) algorithm and the Bayesian method is employed. Furthermore, the Schwarz Information Criterion (SIC) isutilized to identify critical change points in PV module degradation trajectories. To validate the universality andeffectiveness of the proposed method, a comparative analysis is conducted against other established life predictiontechniques for PV modules.

关键词： Photovoltaic modules degradation stochastic processes lifetime prediction

Sound insulation performance of plates with interconnected distributed piezoelectric patches

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Chinese Journal of Aeronautics 2017年第1期30卷 99-108页

作者： Yi Kaijun Li Lin Mohamed Ichchou Manuel Collet Laboratory of Tribology and systems Dynamics Ecole Centrale de Lyon school of energy and Power Engineering Beihang University

This paper deals with the sound insulation performance of a thin plate with interconnected distributed piezoelectric patches. Piezoelectric patches are periodically bonded on the surfaces of the plate in a collocated fashion, and are interconnected via an inductive circuit network. This piezoelectric system is termed as piezo-electromechanical（PEM） plate in the *** methods are involved under a sub-wavelength assumption to analytically develop the dynamical equations for the PEM plate. The dispersion relationships and energy densities of the wave modes propagating in the PEM plate are studied; the sub-wavelength assumption is verified for the simulations in this paper. The coincidence frequency of the PEM plate is researched, and results show that the coincidence frequency of the PEM plate will disappear at certain circumstances; mathematical and physical explanations are made for this phenomenon. The disappearance of the coincidence frequency is used to optimize the value of inductance, for the purpose of improving the sound transmission loss of the PEM plate.

关键词： Coincidence frequency Homogenization Piezoelectric material Sound transmission loss Wave propagation

Global Stability Analysis of Switched Nonlinear Observers

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International Journal of Automation and computing 2015年第4期12卷 432-439页

作者： Imen Manaa Nabil Barhoumi Faouzi Msahli The National Engineering school of Monastir Department of Electrical EngineeringStudy of Industrial Systems and Renewable Energy

This paper considers the problem of simultaneous estimation of the system states and the strategy of commutation for a larger class of nonlinear switched ***,a hybrid high gain observer is considered to get the exact estimation of the continuous states where the strategy of switching is previously ***,an extension to a larger class of nonlinear hybrid systems with arbitrary switching is *** analysis is widely discussed for the two cases to provide a finite-time convergence of the estimation *** effectiveness of the proposed hybrid high gain observer has been proved by applying it to a quadruple tank process.

关键词： Nonlinear hybrid system switching strategies Lyapunov function stability analysis

通过受控晶体应变揭示PtCo双金属固体溶液中增强的氧还原活性（英文）

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Science China Materials 2025年第1期 180-188页

作者：贺宁吴胜强俞文松金方润谢文俊鲁欣欣赵晓续陈仲欣涂文广唐叔贤 school of Science and Engineering The Chinese University of Hong Kong school of Materials Science and Engineering Peking University school of Materials Science and Engineering Huaqiao University Petro China Shenzhen New energy Research Institute Institute of Materials Science and Devices Suzhou University of Science and Technology

开发用于氧还原反应（ORR）的低成本、高活性铂（Pt）基电催化剂对于燃料电池的广泛应用至关重要.一种有效的方法在于将Pt与非贵过渡金属合金化,以调节Pt表面的物理化学状态.然而,由于合金化过程中成分、晶体类型和表面结构的复杂性,在...

开发用于氧还原反应（ORR）的低成本、高活性铂（Pt）基电催化剂对于燃料电池的广泛应用至关重要.一种有效的方法在于将Pt与非贵过渡金属合金化,以调节Pt表面的物理化学状态.然而,由于合金化过程中成分、晶体类型和表面结构的复杂性,在理解结构-性能关系方面仍然存在巨大挑战.在本研究中,我们使用液相合成方法合成了一系列不同比例的PtCo双金属固溶体.通过利用固溶体的特性,所得的PtCo双金属合金保持了面心立方晶体结构,最大限度地减少了合金化过程中引入的复杂性,有利于活性机理分析.此外,在受控合金成分和晶体结构下,我们研究了氧还原反应的电催化活性对铂催化剂表面应变的依赖性.据此设计的S-PtCo-SNPs阴极赋予了质子交换膜燃料电池（PEMFC）(2.08 W cm-2,4 A cm-2)和锌-空气电池（ZAB）(143.1m W cm-2,214.5m A cm-2)出色的性能.

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Controllably elevating the initial Coulombic efficiency of Li3VO4 anode via a facile electrode pre-lithiation technique for lithium-ion batteries

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Science China Chemistry 2025年

作者： Haoyue Liang Xingguo Zhong Guxin Huang Wenpan Liu Yao Liu Shuhao Wang Deyu Wang Hao Liu Hao Wang Tianyou Zhai Huiqiao Li State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Shenzhen Research Institute of Huazhong University of Science and Technology Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials &Technology Jianghan University Centre for Clean energy Technology Faculty of Science University of Technology Sydney Yichang Brunp Recycling Technology Co. Ltd.

Li3VO4has been a promising insertion anode material for Li-ion batteries,which has high theoretical capacity (up to～600 mAh g-1) and safe Li insertion voltage （0.5–1 V ***/Li+）.However,the low initial Coulombic efficiency （ICE） has always been the bottleneck limiting its ***,we propose a facile pre-lithiation method to controllably elevate the ICE by the post-treatment of the prepared Li3VO4composite electrode based on an immersion *** this process,the whole electrode was immersed in the liquid Li source,via which the ICE of the Li3VO4electrode can be controllably elevated from 80%to over 100%within 5 min of *** than the traditional powder treatment for pre-lithiation,this process we proposed minimizes the impact of pre-lithiation on the battery assembly ***,we further investigated the effect of this pre-lithiation process on the functional components in the *** the first time the ICE of Li3VO4electrode was elevated to 100%.As a result,the initial reversible capacity of LiFePO4||Li3VO4full cell was improved from 44.0 to146.3 m Ah g-1,demonstrating the feasibility and great potential of the process.

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Modification strategies on nickel-based electrocatalysts for energyefficient anodic reactions

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Nano Research 2025年第1期18卷 50-75页

作者： Jingwen Yu Yunliang Liu Naiyun Liu Yaxi Li Yuanyuan Cheng Peng Cao Yixian Liu Xinya Yuan Xinyue Zhang Haitao Li Institute for energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China

Electrocatalytic chemical oxidation(ECO)is an energy-efficient anodic reaction alternative to the oxygen evolution reaction(OER).ECO lowers the reaction potential and yields higher-value fine chemicals at the *** catalyst material plays a crucial role in influencing and determining ECO *** catalyst performance encompasses aspects such as activity,stability,selectivity and *** electrocatalysts have garnered significant attention for their exceptional performance and widespread use in ECO *** modifying nickel-based electrocatalysts,the formation of NiOOH active centers can be *** such as adjusting size and morphology,doping,introducing defects and constructing heterojunctions are advantageous for enhancing *** the rapid advancements in related research fields,it is imperative to comprehend the mechanisms of nickel-based electrocatalysts in ECO and develop innovative *** article provides an overview of the modification strategies of nickel-based electrocatalysts,as well as their applications and mechanisms in ECO.

关键词： anodic reactions electrocatalytic chemical oxidation nickel-based electrocatalysts NiOOH modification strategies

Simultaneous desulfurization and denitrification of sintering flue gas via composite absorbent

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Chinese Journal of Chemical Engineering 2016年第8期24卷 1104-1111页

作者： Jie Wang Wenqi Zhong Key Laboratory of energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Centre for Simulation and Modelling of Particulate systems Southeast University–Monash University Joint Research School

Experiments on simultaneous absorption of SO_2 and NO_X from sintering flue gas via a composite absorbent NaClO_2/NaClO were carried out. The effects of various operating parameters such as NaClO_2 concentration(ms), NaClO concentration(mp), molar ratio of NaClO_2/NaClO(M), solution temperature(TR), initial solution pH, gas flow(Vg) and inlet concentration of SO_2(CS) and NO(CN) on the removal efficiencies of SO_2 and NO were discussed. The optimal experimental conditions were determined to be initial solution pH = 6, TR=55 °C and M = 1.3 under which the average efficiencies of desulfurization and denitrification could reach99.7% and 90.8%, respectively. Moreover, according to the analysis of reaction products, it was found that adding NaClO to NaClO_2 aqueous solution is favorable for the generation of ClO_2 and Cl_2 which have significant effect on desulfurization and denitrification. Finally, engineering experiments were performed and obtained good results demonstrating that this method is practicable and promising.

关键词： Simultaneous desulfurization and denitrification Sintering flue gas Composite absorbent