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Durable ruthenium oxide catalysts for water oxidation reaction

Science China Chemistry 2025年第6期68卷 2217-2233页

作者： Jixiang Jiao Ding Chen Hongyu Zhao Ying Dong Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Water electrolysis is an important way for high-purity hydrogen production. However, the oxygen evolution reaction（OER）, as a key reaction, has a high energy barrier, and the associated catalyst is prone to failure. Therefore, efficient and stable OER catalysts are urgently required. Compared with commercial iridium oxide（IrO2）, ruthenium oxide（RuO2） has a lower price and higher catalytic activity for OER due to its location at the near-top of the volcano plot, but has lower structural stability. Thus, an in-depth understanding of the failure mechanism of RuO2is conducive to the reaction pathway design and structural modulation for obtaining higher stable Ru O2catalysts. Here, we discuss recent advances in the enhancement of the stability of RuO2catalysts. First, we analyze in depth the three failure modes of RuO2, including the oxidation of Ru, the lattice oxygen evolution,and the catalyst exfoliation during the OER process. Second, to improve the durability of RuO2catalysts, five modification strategies, comprising defective engineering, strain engineering, phase engineering, interface engineering and microenvironmental engineering, are summarized, and corresponding enhancement mechanisms are also discussed. Finally, the challenges and possible solutions for further breakthroughs of RuO2catalysts are proposed, and the future research trends and prospects of RuO2catalysts are also envisioned. Undoubtedly, this work will contribute to the understanding and design of highly stable OER catalysts and beyond.

关键词： oxygen evolution reaction electrocatalysis RuO2-based catalysts stability

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Degradation mechanism,direct regeneration and upcycling of ternary cathode material for retired lithium-ion power batteries

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Journal of Energy Chemistry 2025年第3期102卷 534-554页

作者： Juan Wang Dongqi Li Weihao Zeng Xingye Chen Yixin Zhang Shaojie Zhang Zhongpeng Li Changhao Li Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

With the approaching of large-scale retirement of power lithium-ion batteries(LIBs),their urgent handling is required for environmental protection and resource ***,at present,substantial spent power batteries,especially for those high recovery value cathode materials,have not been greenly,sustainably,and efficiently *** to the traditional recovery method for cathode materials with high energy consumption and severe secondary pollution,the direct repair regeneration,as a new type of short-process and efficient treatment methods,has attracted widespread ***,it still faces challenges in homogenization repair,electrochemical performance decline,and scaling-up *** promote the direct regeneration technology development of failed NCM materials,herein we deeply discuss the failure mechanism of nickel-cobalt-manganese(NCM)ternary cathode materials,including element loss,Li/Ni mixing,phase transformation,structural defects,oxygen release,and surface degradation and *** on this,the detailed analysis and summary of the direct regeneration method embracing solid-phase sintering,eutectic salt assistance,solvothermal synthesis,sol-gel process,spray drying,and redox mediation are ***,the upcycling strategy for regeneration materials,such as single-crystallization and high-nickelization,structural regulation,ion doping,and surface engineering,are discussed in ***,the challenges faced by the direct regeneration and corresponding countermeasures are pointed ***,this review provides valuable guidance for the efficient and high-value recovery of failed cathode materials.

关键词： Spent NCM materials Retired lithium-ion power battery Degradation mechanism Direct regeneration Upcycling strategy

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Effect of Molecular Weight on Thermoelectric Performance of P3HT Analogues with 2-Propoxyethyl Side Chains

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Journal of Wuhan University of technology(materials Science) 2024年第2期39卷 268-281页

作者：董得福 WANG Wei ZHAN Chun LI Chenglong ZHOU Qisheng 肖生强 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

By replacing hexyl chains in poly(3-hexylthiophene)(P3HT)with 2-propoxyethyls,four poly(3-(2-propoxyethyl)thiophene)(P3POET)homopolymers with comparable polydispersity indexes(PDI)and regioregularities were prepared herein in addition with step increment of about 7 kDa on numberaverage molecular weight(M_(n))from around 11 to 32 kDa(accordingly denoted as P11k,P18k,P25k,and P32k).When doped in film by FeCl_(3)at the optimized conditions,the maximum power factor(PF_(max))increases greatly from 4.3μW·m^(-1)·K^(-2)for P11k to 8.8μW·m^(-1)·K^(-2)for P18k,and further to 9.7μW·m^(-1)·K^(-2)for P25k,followed by a slight decrease to 9.2μW·m^(-1)·K^(-2)for *** close Seebeck coefficients(S)at PF_(max)are observed in these doped polymer films due to their consistent frontier orbital energy levels and Fermi *** main contribution to this PF_(max)evolution thus comes from the corresponding conductivities(σ).Theσvariation of the doped films can be rationally correlated with their microstructure evolution.

关键词： conjugated polymer molecular weight microstructure thermoelectric performance

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Microstructure Regulation and Combustion Performance Optimization of PVDF/Al Composite Powder by Non-covalent Functionalized Graphenes

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Journal of Wuhan University of technology(materials Science) 2024年第4期39卷 904-911页

作者：易卓然 DENG Haoyuan QIN Mei 孙一 LUO Guoqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Graphene prepared by non-covalent modification of sulfonated poly(ether-ether-ketone)(SPG)was combined with polyvinylidene fluoride(PVDF)/Al to improve the PVDF/Al thermal conductivity while reducing the effect of the thermal resistance at the graphene-polymer *** regulation rule of SPG with different contents on the energy release of fluorine-containing system was *** the content of SPG is 4%,the peak pressure and rise rate of SPG/PVDF/Al composite powder during ignition reach the maximum of 4845.28 kPa and 8683.58 kPa/*** the content of SPG is 5%,the PVDF/Al composite powder is completely coated by SPG,and the calorific value of the material reachs the maximum of 29.094 kJ/*** the design and micro-control of the composite powder,the calorific value of the material can be effectively improved,but the improvement of the mass release rate still depends on the graphene content and surface modification state.

关键词： energetic materials PVDF/Al composites graphene modification energy release combustion

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Control of interfacial reaction and defect formation in Gd/Bi_(2)Te_(2.7)Se_(0.3) composites with excellent thermoelectric and magnetocaloric properties

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Chinese Physics B 2024年第8期33卷 474-481页

作者：薛天畅魏平刘承姗李龙舟朱婉婷聂晓蕾赵文俞 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The method to combine thermoelectric(TE)and magnetocaloric(MC)cooling techniques lies in developing a new material that simultaneously possesses a large TE and good MC cooling *** this work,using n-type Bi_(2)Te_(2.7)Se_(0.3)(BTS)as the TE base material and Gd as the second-phase MC material,Gd/BTS composites were prepared by the spark plasma sintering *** the composites,interfacial reaction between Gd and BTS was identified,resulting in the formation of Gd Te,which has a large impact on the electron concentration through the adjustment of defect *** MC/TE composite containing 2.5 wt%Gd exhibited a ZT value of 0.6 at 300 K,essentially retaining the original TE performance,while all the composites largely maintained the excellent MC performance of *** work provides a potential pathway to achieving high performance in MC/TE composites.

关键词： thermo-electro-magnetic energy conversion materials interfacial reaction thermoelectric performance magnetic entropy change

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Rekindling hopes for lithium-sulfur batteries

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National Science Review 2025年第4期12卷 88-90页

作者： Hongtao Qu Bao-Lian Su Laboratory of Inorganic Materials Chemistry (CMI) University of Namur State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Lithium-sulfur(Li-S) batteries represent a promising solution for next-generation energy storage due to their high energy density, low cost, and environmental friendliness. However, liquid electrolytebased Li-S batteries are plagued by the‘polysulfide shuttling' effect, leading to severe performance degradation [1,2].

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Ultrastrong MXene film bridged by liquid metal

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Science China materials 2024年第12期67卷 4115-4116页

作者： Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Two-dimensional(2D)titanium carbide(Ti_(3)C_(2)T_(x))MXene nanosheets show promising mechanical and electrical properties,indicating great potential applications in aerospace and electronic devices,etc.[1,2].There are many assembling approaches including vacuum filtration,blade coating and layer-by-layer[3–5].However,it still remains a great challenge to realize the intrinsic performance of MXene nanosheets into macroscopic film due to low stress transfer efficiency,which usually is indued by the voids and misalignment during the assembling process[6].Thus,it remains a great challenge to assemble MXene nanosheets into high-performance macroscopic MXene films.

关键词： carbide coating film

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Bioprocess inspired formation of calcite mesocrystals by cation-mediated particle attachment mechanism

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National Science Review 2023年第4期10卷 159-168页

作者： Qihang Wang Bicheng Yuan Wenyang Huang Hang Ping Jingjing Xie Kun Wang Weimin Wang Zhaoyong Zou Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Longzhong Laboratory

Calcite mesocrystals were proposed, and have been widely reported, to form in the presence of polymer additives via oriented assembly of nanoparticles. However, the formation mechanism and the role of polymer additives remain elusive. Here, inspired by the biomineralization process of sea urchin spine comprising magnesium calcite mesocrystals, we show that calcite mesocrystals could also be obtained via atachment of amorphous calcium carbonate(ACC) nanoparticles in the presence of inorganic zinc ***, we demonstrate that zinc ions can induce the formation of temporarily stabilized amorphous nanoparticles of less than 20 nm at a significantly lower calcium carbonate concentration as compared to pure solution, which is energetically beneficial for the atachment and occlusion during calcite growth. The cation-mediated particle atachment crystallization significantly improves our understanding of mesocrystal formation mechanisms in biomineralization and offers new opportunities to bioprocess inspired inorganic ions regulated materials fabrication.

关键词： nonclassical crystallization mesocrystal calcium carbonate zinc ion particle attachment

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Spinel ferrite with excellent broadband infrared radiation properties for thermal management of electronics

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Ceramics International 2025年第16期51卷 21831-21841页

作者： He, Lintao Zhu, Wanting Wang, Yixin Nie, Xiaolei Zhang, Yu Wei, Ping Zhao, Wenyu Zhang, Qingjie State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Electronic equipment faces increasing challenges related to heat dissipation due to miniaturization, high power, and integration advancements. Infrared radiation refrigeration offers numerous advantages, including zero energy consumption and pollution with minimal space occupation, making it highly compatible with the heat dissipation requirements of electronic equipment. However, advancing infrared radiative cooling technology for thermal management requires further research to develop broadband infrared transmitting materials with excellent performance. In this study, the spinel MeFe2O4 (Me = Cu, Mn, Ni, Co, Mg, Zn) powders were prepared through chemical co-precipitation and their emissivity was assessed in various wavebands (3–5, 8–14, 2.5–25, and 1–22 μm). The results showed that spinel ferrite materials displayed outstanding broadband infrared radiative properties. Among them, MnFe2O4 reached the highest emissivity values (0.90, 0.97, 0.96, and 0.97, respectively), suggesting that narrowing the bandgap and improving carrier concentration increases emissivity in the 3–5 μm waveband. Emissivity in the 8–14 μm waveband was also boosted by increasing lattice asymmetry and lattice strain. Furthermore, the MnFe2O4 powder was mixed with PVDF and Graphene, thereby yielding a flexible heat dissipation film. This MnFe2O4/Graphene/PVDF composite film lowered the surface temperature of electronic devices from 90.8 to 83.2 °C at an ambient temperature of 20 °C under operating conditions of approximately 9 W. This study provides an experimental paradigm for designing and optimizing radiative cooling materials for the thermal management of electronic devices. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Ferrite devices

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Strengthening and toughening mechanisms of martensite-bainite microstructure in 2 GPa ultra-high strength steel during hot stamping

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Science China(Technological Sciences) 2025年第5期68卷 15-29页

作者： Yanli SONG Ye LI Jue LU Lin HUA Yanfeng GU Yikuan YANG Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In response to the growing demand for energy efficiency,safety,and lightweight designs in new energy vehicles,this study addresses the challenge of balancing strength and toughness in ultra-high strength steel(UHSS)components produced by hot *** innovative hot stamping process based on a martensite-bainite(M-B)complex-phase microstructure was proposed to enhance the strength and toughness of *** microstructural evolution of the M-B complexphase during the hot stamping process was investigated using commercial B1800HS *** a microstructure consisting of 87.4.%martensite,8.7%lower bainite,and 3.9%film-like retained austenite by volume fraction,the steel achieved a tensile strength of 1944 MPa,total elongation of 9.66%,and impact energy of 25.8 *** with conventional hot stamping,the strength of the material showed only a slight improvement,whereas elongation and impact energy were enhanced by approximately 53%and 32%,respectively.A quantitative relationship among process parameters,resulting microstructure,and mechanical properties was *** between strength and toughness was observed when the low bainite volume fraction ranged from 5.06%to 8.73%.The toughening mechanisms are attributed to the refinement of martensite lath bundles(width of 202 nm)facilitated by bainite formation,the increase in high-angle grain boundaries,and the presence of nanoscale retained austenite(width of 80 nm)between the ***,the refinement of grains and the formation of nanoscale(Nb,Ti)C precipitates(diameter of 17 nm)further contributed to the overall *** developed M-B complexphase process,which involves medium-temperature slow cooling followed by rapid low-temperature quenching,provides an optimal combination of strength and toughness for a wide range of applications.

关键词： ultra-high strength steel hot stamping strengthening and toughening mechanisms martensite-bainite complexphase microstructure

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