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PtNiCuCoPd thin-film catalyst for an efficient alkaline hydrogen evolution reaction

International Journal of Hydrogen Energy 2025年 135卷 48-55页

作者： Yu, Zhiqiang Zhang, YuChen Yang, Siyi Liu, Xianan Gu, Tao Qi, Yixin Li, YunXiang Miao, Fang Yan, Zhijie College of Materials Science and Engineering North University of China Taiyuan030051 China Shanxi Key Laboratory of Advanced Metal Materials for Special Environments North University of China Taiyuan030051 China Shanxi Chunlei Copper Co. Ltd Linfen043500 China Zhejiang Wanfeng Technology Development Co. Ltd Shaoxing City312432 China

The development of highly efficient catalyst for alkaline hydrogen evolution reaction (HER) is crucial for the large-scale electrochemical production of hydrogen fuel. Herein, we report a novel PtNiCuCoPd high-entropy-alloy (HEA) thin-film catalyst prepared via magnetron sputtering. The catalyst exhibits an ultra-low HER overpotential of 38 mV and a Tafel slope of 41 mV/dec at a current density of 10 mA/cm2, which are comparable to those of a Pt catalyst (overpotential: 88 mV at 10 mA/cm−2 and Tafel slope: 120 mV/dec−1), while maintaining notable durability. Such outstanding catalytic activity for the HER is primarily ascribed to the presence of multiple active sites on the surface of PtNiCuCoPd and the synergistic effects of multiple components. Overall, this research highlights the notable catalytic potential of HEA thin-film for the HER, providing a promising approach for realising renewable energy sources in the future. © 2025

关键词： Thin films

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Anomaly Correction for Radiation Patterns of Active Phased Array Antenna Based on a Neural Network

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IEEE Antennas and Wireless Propagation Letters 2025年

作者： Guo, Kegang Zhang, Rui Shen, Lifei Feng, Yiwen Guo, Qingze Xu, Rongqi Tian, Linbo Zhang, Sasa Shandong University School of Information Science and Engineering Qingdao266237 China AVIC Research Institute for Special Structures of Aeronautical Composites Jinan250000 China Shandong University Key Laboratory of Education Ministry for Laser and Infrared System Integration Technology Qingdao266237 China Tsinghua University State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Beijing100084 China

Anomaly interference in the radiation pattern of an active phased array antenna (APAA) is an intractable problem, that affects the overall system performance. To overcome this problem, this paper proposes an antenna radiation pattern anomaly correction model (ARPACM) based on a neural network to compensate for the shortcomings of the antenna radiation pattern (ARP) under anomalous conditions. In addition, to overcome the problem of the scarce data, this study uses simulated anomalous ARPs that are consistent with practical experimental conditions to construct and train a pre-trained model, named simulated ARPACM (SARPACM). The weights of the last hidden layer of the SARPACM are optimized using experimental data by introducing transfer learning, yielding an optimized ARPACM. Extensive experiments are conducted to verify the proposed ARPACM. The results indicate that the proposed model can outperform widely used correction algorithms and other training strategies, in terms of a mean coefficient of determination (R2), a mean square error (MSE), a mean relative error (MRE), achieving improvements of 99.76%, 0.08 dB, and 1.29%, respectively. Finally, the experimental results demonstrate that the ARPACM can effectively correct the anomalies of ARPs caused by various interfering factors. © 2002-2011 IEEE.

关键词： Mean square error

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Anti-stacking synthesis of MXene-reduced graphene oxide sponges for aqueous zinc-ion hybrid supercapacitor with improved performance

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Journal of Materials science & technology 2023年第23期154卷 22-29页

作者： Zonglin Liu Fuhua Xue Xu Zhao Zhong Chen Haowen Zheng Renjie Ding Pengyang Li Liangliang Xu Jinhua Xiong Qingyu Peng Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China

Two‑dimensional MXenes with an enormous active surface area are considered to be significant cathode materials for Zn‑ion hybrid supercapacitors. However, the nanosheets are easily self-restacked during the assembly into macroscopic porous electrodes, resulting in a significantly reduced effective surface area, hindering their applications in energy storage. Here, MXenes are subtly distributed on the surface of the sponge in a coral-like structure rather than participating in the assembly of the framework, which has suppressed the self-restacking of MXene effectively, improved the hydrophilicity of the sponge, and provided fast diffusion channels for electrolyte ions. Therefore, the MXene-TiC-reduced graphene oxide sponge exhibits excellent electrical conductivity, an enormous specific surface area with abundant accessible electroactive sites, and superior electrochemical performance. The resulting sponge demonstrates an outstanding specific capacity, up to 501 mAh g–1 at 0.2 A g–1 , with excellent capacity retention (90%) after 3100 cycles as Zinc-ion hybrid supercapacitor cathodes. Furthermore, it exhibits an elegant gravimetric energy density of 486 mWh g–1 at 415 mW g–1 , which has surpassed most leading MXene-based Zn-ion cathodes. This work provides a new synthetic idea for MXene-based macro-composites and paves a new avenue for designing next-generation flexible and portable porous electrodes with high gravimetric and rate performances.

关键词： MXene Porous binder-free electrode Zinc-ion hybrid supercapacitors In-situ synthesis Self-restacking

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Thermal response, oxidation and ablation of ultra–high temperature ceramics, C/SiC, C/C, graphite and graphite–ceramics

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Journal of Materials science & technology 2022年第7期102卷 137-158页

作者： Xinghong Zhang Baihe Du Ping Hu Yuan Cheng Jiecai Han National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China

Various thermal protection materials exhibit obviously different and complicated thermal response,oxidation and ablation behavior,which are very important for the appropriate design and ***,the relative researches are very few *** this work,the thermal response,oxidation and ablation behavior of representative thermal protection materials including ultra-high temperature ceramics,C/SiC,C/C, graphite and graphite-ceramic were investigated systematically in strong heat flux,high enthalpy and low-pressure *** response of these materials was analyzed based on experimental results and thermal energy balance that accounts for all of the heat transfer processes transporting energy into and out of the *** factors were playing important roles in the thermal response including thermal conductivity,volumetric heat capacity,catalytic efficiency,emissivity and oxidation characteristics of the *** importance of each factor not only depends on the material characteristics such as material composition and phase content but also environment parameters including heat flux,enthalpy,pressure and testing *** comparisons and relationships of oxidation and ablation behaviors for these materials under extreme environments were also illustrated in ***,thermal response and ablation behaviors of pre-oxidized material or repeated tests were also performed to evaluate the effect of pre-treatment on the performance and reusability of thermal protection *** work offers guiding significance for the appropriate design and selection of thermal protection materials.

关键词： Thermal protection materials Ceramic Thermal response Oxidation Ablation

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Precipitation mechanism and microstructural evolution of Al2O3/ZrO2(CeO2) solid solution powders consolidated by spark plasma sintering

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Journal of Materials science & technology 2020年第6期41卷 149-158页

作者： Wanjun Yu Yongting Zheng Yongdong Yu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China

It is difficult to synthesize Al2O3/ZrO2 solid solution because of its low solubility under equilibrium solidification *** this work,a new combustion synthesis combined with water atomization(CS-WA)method was developed to prepare supersaturated Al2O3/ZrO2(CeO2)solid solution *** ultrahigh cooling rate supplied by CS-WA greatly extends solid solubility of Al2O3 in *** precipitation mechanism of solid solution was investigated by systematic heat *** initial temperature of the metastable phase decomposed into Al2O3 and ZrO2 is 1050℃,and it could be completely precipitated at 1400℃in 0.5 *** precipitated ZrO2 particles were uniformly dispersed in Al2O3 matrix and grew into submicron scale at annealing temperature of 1450℃.Subsequently,together with detailed microstructure,phase composition,as well as mechanical properties were collaboratively outlined to discuss spark plasma sintering(SPS)*** solid solution precipitated Al2O3 matrix and ZrO2 particles during the SPS *** ZrO2 particles were uniformly distributed within Al2O3 matrix,while the residuary ZrO2 located at the grain boundaries and formed special transgranular/intergranular *** average size of nanoscale transgranular ZrO2 particles was only^11.5 *** compact ZrO2 toughened Al2O3 nano ceramic(N-ZTA)exhibits excellent mechanical *** work provides a guidance to produce nanostructured ZTA with high performance.

关键词： Solid solution Precipitation Spark plasma sintering ZTA Transgranular/intergranular structure

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Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

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Journal of advanced Ceramics 2023年第2期12卷 258-267页

作者： Hang YIN Xiaodong HE Guangping SONG Yongdong YU Yongting ZHENG Yuelei BAI National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Centre for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China

MoAlB as a typical member of MAB phases has attracted much-growing attention due to its unique ***,the low production of MoAlB powders limits its further development and potential *** the present work,the ultra-fast preparation of high-purity MoAlB powders in a few seconds is achieved by self-propagating high-temperature synthesis(SHS)using a raw powder mixture at an atomic ratio of Mo:Al:B=1:1.3:*** reaction mechanism is obtained by analyzing the corresponding composition changes of starting ***,the thermodynamic prediction for the SHS reaction is consistent with the present experiments,where the preparation of MoAlB also conforms to two common self-propagating conditions of the *** enthalpy *** curve shows that the adiabatic temperature of the reaction decreases with the amount of excuse Al increasing but increases when pre-heating the ***,this thermodynamic calculation provides a new idea for the preparation of other MAB phases by the SHS.

关键词： MoAlB MAB phases combustion synthesis thermodynamics self-propagating hightemperature synthesis(SHS)

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Synthesis and Characterization of the Copper Complex Pearlescent Pigment

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Journal of Harbin Institute of technology(New Series) 2013年第1期20卷 42-45页

作者： Yong-Tao Yao Guo-Jun Yan Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology

The copper complex pearlescent pigment was synthesized by the two steps diazotization and azo coupling. The crystal phases and the microstructure of the copper complex pearlescent pigment powders were characterized through a combination of DSC, FT-IR and SEM analysis after purification. The results indicated that the copper complex pearlescent pigment has very good thermal stability and the fine particle size is uniformly distributed, and the average grain size is around 15 μm.

关键词： pearlescent pigment copper complex pigment azo coupling

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Microstructural evolution and performance of carbon fiber-toughened ZrB_2 ceramics with SiC or ZrSi_2 additive

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Journal of advanced Ceramics 2018年第4期7卷 343-351页

作者： Kaixuan GUI Fangyu LIU Gang WANG Zhongjia HUANG Ping HU School of Materials Science and Engineering Anhui Polytechnic University National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology

ZrB_2–SiC/ZrSi_2 ceramics containing 30 vol% carbon fiber(Cf) additive were fabricated by hot pressing at low temperature(1500 ℃) using submicron ZrB_2 powders, and their microstructural evolution and performance were investigated. The addition of SiC or ZrSi_2 significantly reduced the onset sintering temperature and enhanced the densification of ZrB_2. ZrB_2–ZrSi_2–Cf showed poor performance owing to the serious fiber degradation, while the fiber degradation was effectively inhibited in ZrB_2–SiC–Cf resulting in high fracture toughness, substantial fiber pull-out, and non-brittle fracture mode for such material. The critical thermal shock temperature difference of ZrB_2–SiC–Cf was up to 741 ℃, significantly higher than those of ZrB_2–SiC/ZrSi_2 and ZrB_2–ZrSi_2–Cf. Moreover, this composite displayed a good oxidation resistance at 1500 ℃ in air.

关键词： carbon fibers microstructural evolution hot pressing thermal shock resistance oxidation resistance

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Evaluation of numerical ablation model for charring composites

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science China(Technological sciences) 2019年第8期62卷 1322-1330页

作者： LI Wei ZHANG Jun FANG GuoDong LI WeiJie LIANG Jun MENG SongHe Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin 150001 China Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China

Charring composites are widely used in the thermal protection system(TPS) to consume the intense aerodynamic heating during vehicle reentry. The ablation and thermal responses for the charring composites can be studied by using a numerical ablation model, in which the surface ablation and volume ablation could be taken into account. The coupling interactions among temperature, gas motion and interior pressure producing the pyrolysis gas could make the computation more complicated. A multi-physics model is developed to simulate the thermal response coupled with volume ablation and surface ablation. After studying four typical ablation cases, the model is validated, and then the heat transfer mechanisms in ablation are investigated. It is found that the viscous dissipation energy by the motion of pyrolysis gas can be neglected in the simulation. Also, the flow of pyrolysis gas plays an important role in the temperature response, especially under high heat flux condition.

关键词： ablation charring composites numerical model coupling

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Development of lutetium oxide continuous fibers with excellent mechanical properties

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Journal of advanced Ceramics 2023年第1期12卷 24-35页

作者： Yongshuai XIE Ying PENG Youmei WANG Dehua MA Yuan CHENG Luyi ZHU Jiecai HAN Xinghong ZHANG National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJinan 250100China

The difficulty of reducing the diameter of lutetium oxide(Lu_(2)O_(3))continuous fibers below 50μm not only limits the flexibility of the sample but also seriously affects their application and development in high-energy *** this work,a Lu-containing precursor with high ceramic yield was used as raw material,fiberized into precursor fibers by dry *** pressure-assisted water vapor pretreatment(PAWVT)method was creatively proposed,and the effect of pretreatment temperature on the ceramization behavior of the precursor fibers was *** regulating the decomposition behavior of organic components in the precursor,the problem of fiber pulverization during heat treatment was effectively solved,and the Lu_(2)O_(3) continuous fibers with a diameter of 40μm were *** with the current reported results,the diameter was reduced by about 50%,successfully breaking through the diameter limitation of Lu_(2)O_(3) continuous *** addition,the tensile strength,elastic modulus,flexibility,and temperature resistance of Lu_(2)O_(3) continuous fibers were researched for the first *** tensile strength and elastic modulus of Lu_(2)O_(3) continuous fibers were 373.23 MPa and 31.55 GPa,*** as-obtained flexible Lu_(2)O_(3) continuous fibers with a limit radius of curvature of 3.5-4.5 mm had a temperature resistance of not lower than 1300℃,which established a solid foundation for the expansion of their application form in the field of high-energy lasers.

关键词： lutetium oxide(Lu_(2)O_(3)) continuous fibers tensile strength flexible temperature resistance

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