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Non-precious metal electrocatalysts for two-electron oxygen electrochemistry: Mechanisms, progress, and outlooks

Journal of Energy Chemistry 2022年第6期31卷 54-69,I0003页

作者： yuhan wu Jianhui Sun Shixue Dou Jingyu Sun School of Environment Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control-Ministry of EducationHenan Normal UniversityXinxiang 453007HenanChina College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Hydrogen peroxide (H_(2)O_(2)) is a valuable chemical for a wide variety of applications. The environmentally friendly production route of the electrochemical reduction of O_(2)to H_(2)O_(2) has become an attractive alternative to the traditional anthraquinone process. The efficiency of electrosynthesis process depends considerably on the availability of cost-effective catalysts with high selectivity, activity, and ***, there are many outstanding issues in the preparation of highly selective catalysts, the exploration of the interface electrolysis environment, and the construction of electrolysis devices, which have led to extensive research efforts. Distinct from the existing few comprehensive review articles on H_(2)O_(2) production by two-electron oxygen reduction, the present review first explains the principle of the oxygen reduction reaction and then highlights recent advances in the regulation and control strategies of different types of catalysts. Key factors of electrode structure and device design are discussed. In addition,we highlight the promising co-production combination of this system with renewable energy or energy storage systems. This review can help introduce the potential of oxygen reduction electrochemical production of high-flux H_(2)O_(2) to the commercial market.

关键词： 2e-ORR(oxygen reduction reaction) H_(2)O_(2) Heteroatom doping Single atom Carbon-based catalyst

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Some Metric Properties of Sets Related to Luroth Expansion

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wuhan University Journal of Natural Sciences 2022年第2期27卷 93-98页

作者： DENG Jiang wu yuhan School of Mathematics and Statistics Hubei University of EducationWuhan 430205HubeiChina School of Mathematics and Statistics Wuhan UniversityWuhan 430072HubeiChina

This paper is mainly concerned with scrambled sets for Luroth *** is shown that all scrambled sets have null Lebesgue measure and there exists a scrambled set with full Hausdorff dimension.

关键词： dimension map. Hausdorff

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Double-Layer-Optimizing Method of Hybrid Energy Storage Microgrid Based on Improved Grey Wolf Optimization

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Computers, Materials & Continua 2023年第8期76卷 1599-1619页

作者： Xianjing Zhong Xianbo Sun yuhan wu College of Intelligent Science and Engineering Hubei Minzu UniversityEnshi445000China College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing210000China

To reduce the comprehensive costs of the construction and operation of microgrids and to minimize the power fluctuations caused by randomness and intermittency in distributed generation,a double-layer optimizing configuration method of hybrid energy storage microgrid based on improved grey wolf optimization(IGWO)is ***,building a microgrid system containing a wind-solar power station and electric-hydrogen coupling hybrid energy storage ***,the minimum comprehensive cost of the construction and operation of the microgrid is taken as the outer objective function,and the minimum peak-to-valley of the microgrid’s daily output is taken as the inner objective *** iterating through the outer and inner layers,the system improves operational stability while achieving economic ***,using the energy-self-smoothness of the microgrid as the evaluation index,a double-layer optimizing configuration method of the microgrid is ***,to improve the disadvantages of grey wolf optimization(GWO),such as slow convergence in the later period and easy falling into local optima,by introducing the convergence factor nonlinear adjustment strategy and Cauchy mutation operator,an IGWO with excellent global performance is *** testing with the typical test functions,the superiority of IGWO is ***,using IGWO to solve the double-layer *** case analysis shows that compared to GWO and particle swarm optimization(PSO),the IGWO reduced the comprehensive cost by 15.6%and 18.8%,***,the proposed double-layer optimizationmethod of capacity configuration ofmicrogrid with wind-solar-hybrid energy storage based on IGWO could effectively improve the independence and stability of the microgrid and significantly reduce the comprehensive cost.

关键词： Wind-solar microgrid hybrid energy storage optimization configuration double-layer optimization model IGWO

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Layered vanadium oxides:Promising cathode materials for calcium-ion batteries

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Chinese Journal of Structural Chemistry 2024年第5期43卷 5-7页

作者： yuhan wu Qing Zhao Zhijie Wang School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang110870China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin300071China Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijing100083China

Electric vehicles powered by lithium-ion batteries(LIBs)have been regarded as an effective way to reduce CO_(2)emissions,which is known as one of the main causes of global *** share of electric ve-hicles in total sales has increased rapidly,from around 4%in 2020 to 14%in 2022[1].In this case,LIBs have been mass-produced and consumed in the past few *** is estimated that LIBs will account for 65%of total lithium consumption by 2025[2].

关键词： lithium vanadium powered

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Heterointerface engineering in hierarchical assembly of the Co/Co(OH)_(2)@carbon nanosheets composites for wideband microwave absorption

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Nano Research 2023年第2期16卷 2611-2621页

作者： yuhan wu Guodong Wang Xixi Yuan Gang Fang Peng Li Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aerospace Research Institute of Material&Processing Technology Beijing 100076China

Heterogeneous interface engineering strategy is an effective method to optimize electromagnetic functional ***,the mechanism of heterogeneous interfaces on microwave absorption is still *** this study,abundant heterointerfaces were customized in hierarchical structures via a collaborative strategy of lyophilization and hard *** impressive electromagnetic heterostructures and strong interfacial polarization were realized on the zero-dimensional(0D)hexagonal close-packed(hcp)-face-centered cubic(fcc)Co/two-dimensional(2D)Co(OH)_(2)nanosheets@three-dimensional(3D)porous carbon nanosheets(Co/Co(OH)_(2)@PCN).By controlling the carbonization temperature,the electromagnetic parameters were further adjusted to broaden the effective absorption bandwidth(EAB).Accordingly,the EAB of these absorbers were almost greater than 6 GHz(covering the entire Ku-band)in the thickness range of 2.0–2.2 mm except the sample *** far as to the S-0.8-700 achieved an EAB up to 7.1 GHz at 2.2 mm and the minimum reflection loss(RLmin)value was−25.8 ***,in the far-field condition,the radar cross section(RCS)of S-0.8-700 can be reduced to 19.6 dB·m^(2).We believe that this work will stimulate interest in interface engineering and provide a direction for achieving efficient absorbing materials.

关键词： microwave absorption wide bandwidth interface engineering hierarchical porous structure absorption mechanism

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Controllable heterogeneous interfaces and dielectric regulation of hollow raspberry-shaped Fe_(3)O_(4)@rGO hybrids for high-performance electromagnetic wave absorption

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Journal of Materials Science & Technology 2023年第20期151卷 10-18页

作者： yuhan wu Shujuan Tan Puyu Liu Yan Zhang Peng Li Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Heterogeneous interface engineering is closely related to the structural design of electromagnetic absorbers;thus,the interface control through structural design is a considerable approach to optimize the electromagnetic wave absorption(EWA)***,the 3D hierarchical structure composites composed of two-dimensional reduced graphite oxide(rGO)and hollow raspberry Fe_(3)O_(4) nanoparticles was successfully fabricated by a simple pyrolysis and self-assembly *** specific structure enriches the characteristics of interface polarization and dipole polarization,which further induces significant EWA *** adjusting the amount of graphite oxide(GO),the complex dielectric constant of the obtained hybrids can be controlled,and the heterointerface can be cleverly *** minimum reflection loss(RLmin)of the typical products can be up to−73.86 dB at the thickness is only 1.35 mm,and the maximum effective absorption bandwidth(EAB)can reach 5.1 *** work demonstrates that the unique structure and tunable components can fully improve the potential of electromagnetic absorption performance,which provides basic guidance for the heterogeneous interface engineering of efficient electromagnetic functional materials.

关键词： Electromagnetic wave absorption Dielectric regulation Self-assemble Hierarchical structure Composites

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Morphological Correlates of the Phonatory Organ in an Ultrasonically Phonating Frog

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Asian Herpetological Research 2012年第3期3卷 240-251页

作者： Rongchuan XIONG Bin WANG yuhan wu Jianping JIANG Chengdu Institute of Biology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences College of Life Sciences Sichuan University Department of Life Science Liupanshui Normal College

The concave-eared torrent frog(Odorrana tormota) is the first species of tailless amphibian that was evidenced to phonate and detect ultrasounds. We employed anatomic and histological methods to examine the phonatory organs, including the floor of the buccal cavity, vocal cords and glottis, of O. tormota and its sympatric species including O. graminea, O. schmackeri, and Amolops wuyiensis with different fundamental frequencies, and Pelophylax nigromaculatus as a control. Our results reveal that O. tormota possesses specialized phonatory organ structures, with thinner vocal cords modulated by a moderately stronger muscular mastoideus between the medial vocal cords and the lateral cricoid cartilages, and more elastic mouth floor to likely supply faster air stream which could make the vocal cords vibrate at higher frequencies, larger relative distance between the two muscles m. intermandibulares(RDMI), and higher nucleus density of m. intermandibularis(NDMI) and m. geniohyoideus(NDMG). The results of Pearson’s correlation tests between the mean values of the above measurements and the fundamental frequencies from the five species imply that all the specialized phonatory organ structures mentioned above might be favored by higher frequency of phonation of O. tormota.

关键词： concave-eared torrent frog comparative anatomy ultrasonic phonation fundamental frequency

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Understanding the efficient microwave absorption for Fe Co@ZnO flakes at elevated temperatures a combined experimental and theoretical approach

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Journal of Materials Science & Technology 2022年第30期125卷 212-221页

作者： Kangsen Peng Chuyang Liu yuhan wu Gang Fang Guoyue Xu Yujing Zhang Chen wu Mi Yan School of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027China

Considerable microwave absorption performance at elevated temperatures is highly demanded in both civil and military *** dielectric or magnetic absorbers are difficult to attain efficient and broadband microwave absorption at the high temperature range of 373 K-573 K,and the evolution mechanism of the microwave absorption is still unclear especially for the magnetic ***,ZnO coated flaky-FeCo composite is proposed to break through the bottleneck,which possesses microwave absorption(RL<-10 dB)that covering the whole X band(8.2 GHz-12.4 GHz)at the temperature range of 298 K-573 K with a thickness of only~2 ***,attenuation mechanism and evolution of the microwave absorption properties for the FeCo@ZnO flaky material at elevated temperature has been clearly disclosed by the composition and microstructure characterizations,electromagnetic performance measurements and first principles calculations for the first ***,the Poynting vector,volume loss density,magnetic field(H)and electric field(E)are simulated by HFSS to understand the interaction between EM waves and the samples at different temperatures,further elaborating the attenuation mechanism in high-temperature *** study provides guidance in designing and developing high-temperature microwave absorbers for the next generation.

关键词： Zn O coated flaky-FeCo High-temperature microwave absorption First principles calculation HFSS simulation

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Primitive Non-Powerful Symmetric Loop-Free Signed Digraphs with Base 3 and Minimum Number of Arcs

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Journal of Mathematical Research with Applications 2013年第3期33卷 273-287页

作者： Lihua YOU yuhan wu School of Mathematical Sciences South China Normal University

Let S be a primitive non-powerful symmetric loop-free signed digraph on even n vertices with base 3 and minimum number of arcs. In [Lihua YOU, yuhan wu. Primitive non-powerful symmetric loop-free signed digraphs with given base and minimum number of arcs. Linear Algebra Appl., 2011, 434(5), 1215-1227], authors conjectured that D is the underlying digraph of S with exp(D) = 3 if and only if D is isomorphic to ED n,3,3 , where ED n,3,3 = (V, A) is a digraph with V = {1, 2, . . . , n}, A = {(1, i), (i, 1) | 3≤i≤n} ∪ {(2i-1, 2i), (2i, 2i-1) | 2≤i≤ n/2 } ∪ {(2, 3), (3, 2), (2, 4), (4, 2)}). In this paper, we show the conjecture is true and completely characterize the underlying digraphs which have base 3 and the minimum number of arcs.

关键词： primitive symmetric non-powerful base signed digraph.

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Efficacy of a mineralized collagen bone-grafting material for peri-implant bone defect reconstruction in mini pigs

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Regenerative Biomaterials 2019年第2期6卷 107-111页

作者： Enbo Wang Jianmin Han Xuehui Zhang yuhan wu Xu-Liang Deng Department of Oral and Maxillofacial Surgery Peking University School and Hospital of Stomatology22 Zhongguancun South StreetHaidian DistrictBeijing 100081China Department of Dental Materials Peking University School and Hospital of Stomatology22 Zhongguancun South StreetHaidian DistrictBeijing 100081China Department of Geriatric Dentistry Peking University School and Hospital of Stomatology22 Zhongguancun South StreetHaidian DistrictBeijing 100081China

The mechanism of the mineralization process induced by natural mineralized collagen(MC)has been investigated for *** purpose of this study was to investigate the efficacy of selfassembled MC for peri-implant bone defect reconstruction in a mini pig.A standardized peri-implant bone defect model was created using 14 mini pig *** materials were evaluated,i.e.a mixture of hydroxyapatite and collagen(Type A,TA),and self-assembled MC(Type B,TB).Bio-Oss(BO)and untreated(blank control,BC)groups were used as *** 3-and 6-month healing periods,the mini pigs were sacrificed for histomorphometric and microcomputed tomography *** 3 months of healing,the average alveolar ridge height was 3.2761.57mm for group TA,3.28±2.02mm for group TB and 3.37±1.09mm for group BO,while group BC showed the lowest height of 2.68±*** 6 months of healing,the average alveolar ridge height was 2.64±1.13mm for group TA,4.31±1.80mm for group TB and 3.8761.38mm for group BO,while group BC showed the lowest height of 2.48±*** experimental groups and control group showed similar bone volume density,bone complexity and histological *** self-assembled MC(Type B)stimulated new bone formation in the reconstruction of deficient alveolar ridges around the dental implant;it also displayed excellent clinical operability compared with bone grafts without collagen.

关键词： dental implant bone-grafting material mineralized collagen

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