CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhenni Ding,Zilin Li,Yanhui Cao,Kaifeng Chen,Haiyan Zhuang,Jingjing Wang,Congshu Huang,Chi Ma,Dajiang Zheng
By depositing V 2 O 5 on precursor co-CoNi films with MnO 2 pretreatment layer using cyclic voltammetry (CV), a ternary electrochromic (EC) film with high performance and multicolor characteristic was obtained in this work. Compared with binary electrochromic film with deposition of V 2 O 5 on CoNi hydroxide films directly, the introduction of MnO 2 enhanced the cyclic stability significantly through formation of a more compact micro morphology and appearance of more active sites in this case. In addition, the ternary film presents higher optical modulation, less response time, higher coloring efficiency, better color memory ability, larger color range and faster electrochemical kinetics. The excellent electrochromic performance of the obtained film makes it possible to manufacture multicolor transparent EC devices, and demonstrates a promising application prospect in related fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Xue Xiangyong,Lu FengFei,Liu Xing,Cheng Lichun,Li Zhenchun,Yao Qingrong,Long Qianxin,Shao Hongyu
Sugar-derived carbon materials have special electrical and optical properties, and their hybridization with magnetic alloys can generate enhanced attenuation constants and better impedance matching due to electrical and magnetic interactions. This study prepared CoNi/C composite materials and modified the microstructure and dielectric constant of magnetic alloys by selecting carbon sources and controlling carbonization processes. The results showed that CoNi/C flakes carbonized using glucose-derived carbon at 500°C exhibited a significant reflection loss (RL) of −42.91 dB and an effective absorption bandwidth covering 6.08 GHz (RL < −10 dB). In addition, CST simulations show that CoNi/C significantly reduces the radar cross section (RCS) value by 35.28 dB m 2 . Compared with cornstarch- and fructose-derived carbon, glucose-derived carbon exhibits better impedance matching performance and wider absorption bandwidth.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiale Wu,Jin Hu,Zhongshan Deng,Yongjin Feng,Kaijun Wang,Zhiyi Wang,Junkai Li,Kaizhao Wang
Magnetic-dielectric functional materials with unique three-dimensional (3D) anisotropic structures, reasonable component regulation, and hierarchical heterogeneous interfaces are potential candidates for achieving efficient microwave absorption (MA). In this paper, CoNi/SiO 2 hybrids are synthesized for high-performance MA by anchoring the dielectric SiO 2 layer by Stöber's sol-gel method to regulate the permittivity (ε r ). The results show that the abundant pores and high specific surface area of the coral-like spherical structure, the ε r modulation of CoNi alloy by SiO 2 shell-layer, the heterogeneous interface and charge storage capacity difference between both, which provide more reflective and scattering channels for the incident electromagnetic wave (EMW), optimize the impedance matching and enhance the interfacial polarization loss and magnetic loss, and finally achieve the reflection loss (RL) enhancement and effective absorption bandwidth (EAB) broadening. In particular, the coral-like CoNi@SiO 2 -2 microparticle (MP) has the strongest RL of -66.59 dB at 2.2 mm matching thickness and the maximum EAB of 6.460 GHz at 1.9 mm matching thickness, which covers the entire Ku-band. In this study, the hierarchical heterostructure is constructed by a unique morphology design and the introduction of a dielectric anchoring layer, which provides a new way to prepare efficient microwave-absorbing materials by magnetic-dielectric coupling engineering.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Xiaofeng Shi,Lei Wang,Lin Chen,Qiaoling Xu,Zhengting Du,Deqing Shi,Zhenfa Zi,Renchao Che
Chain-like magnetic-dielectric composites have become an ideal choice for electromagnetic (EM) wave absorption materials due to their excellent component adjustment and structural optimization. Here, the chain-like CoNi@C heterojunction was obtained via multi-step reaction combining the solvothermal reaction, polymerization reaction, and annealing treatment. Magnetic chain-like CoNi alloy was firstly synthesized under application magnetic field, where offered the polymerization surfaces for the dopamine monomer. Then, as-prepared CoNi@PDA composites were undergoing the annealing treatment at N 2 atmosphere to obtain the chain-like CoNi@C heterojunction. The EM parameters and impedance match properties of the CoNi@C composites can be efficiently regulated via tunning the carbon shell. Combining with the magnetic-dielectric balance and synergy loss absorption, chain-like CoNi@C heterojunction exhibited outstanding EM wave performance. Optimized CoNi@C-7 heterojunction exhibited the minimum reflection loss (RL min ) value can reach to −50.3 dB at 11.92 GHz when the thickness is 1.95 mm and the effective absorption bandwidth (EAB) can up to 4.16 GHz from 13.84 GHz to 18 GHz at only 1.5 mm thickness. Therefore, the chain-like magnetic-dielectric CoNi@C composites provided a new design ideal to fabricate the EM wave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujie Ren,Shilin Fan,Bin Zhu,Peng Yang,Jinggang Wang,Soliman I. El-Hout,Jian Zhang,Chunlin Chen
The green synthesis of 2,5-furandicarboxylic acid (FDCA), famous as a bio-based polymer monomer from the 5-hydroxymethylfurfural (HMF), offers a promising route to reduce the usage of petroleum-based polymer polyethylene terephthalate. Although the electrocatalytic preparation of FDCA rids high temperature and pressure limits, most electrocatalysts used in the HMF oxidation reaction (HMFOR) are usually fabricated in harsh conditions. Therefore, we propose a method to improve the performance of electrocatalysts in the HMFOR reaction by introducing metal salts using natural seawater as the main feedstock. The final Co-sw/NF realized a 97.4% FDCA yield and 97.3% Faraday efficiency (FE). In-situ Raman techniques identified the catalytically active species of the catalysts employed in the HMFOR process. The effect of metal salts on catalyst energy levels is discussed in detail using the ultraviolet photoelectron spectroscopy (UPS) and Tauc plot method. The adsorption performance of HMF on the catalyst was determined by calculating the d-band centers and applying open circuit potential (OCP) tests. Furthermore, we elucidate the specific mechanism in terms of electron transport pathways.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·70371-70385
·
IF 5.8
Li Jiayi,Yan Chumin,Sun Dedong,Ma Hongchao,Wang Guowen,Ma Chun,Hao Jun
In this work, Fe 3 O 4 /CoNi-MOF was synthesized by a simple solvothermal method. The catalytic performance of 0.2-Fe 3 O 4 /CoNi-MOF toward PMS activation was studied by degradation of 20 mg/L methylene blue (MB). The results indicated that 0.2-Fe 3 O 4 /CoNi-MOF had good catalytic ability, the removal rate of MB was 99.4% within 60 min with 125 mg/L PMS and 150 mg/L catalyst. Quenching experiment and electron paramagnetic resonance (EPR) analysis revealed that the singlet oxygen ( 1 O 2 ), superoxide radical (•O 2 − ) and sulfate radical (SO 4 •− ) played a crucial role in the catalytic degradation process. Meantime, mechanism of PMS activation by 0.2-Fe 3 O 4 /CoNi-MOF was proposed, the electrons donated by Fe 2+ can also enhance the Co–Ni cycles. In conclusion, Fe 3 O 4 /CoNi-MOF composite catalyst has the advantages of simple preparation, excellent catalytic activity and reusability, which is an effective catalyst for water pollution control.
研究领域:
环境化学
·
催化
·
纳米材料
·
水处理
·
化学工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Changke Shao,Mingsheng Luo,Huanqiao Song,Shixin Zhang,Fengli Wang,Xinyue Liu,Zitian Huang
Great interest has been taken in oxygen reduction reaction (ORR), as a common cathode reaction in new energy sources such as fuel cells and metal–air batteries, to improve the current energy structure and develop new green energy sources. Noble metal Pt is still considered the best catalyst for this reaction. However, its disadvantages such as high cost, low selectivity, poor stability, and susceptibility to impurity poisoning severely limit its further industrial applications. Therefore, development of efficient and low-cost ORR reduction catalysts is particularly critical. M-Nx-C materials have been extensively studied to achieve a high ORR activity close to that of Pt catalysts. In this study, CoNi bimetallic alloy carbon-based oxygen reduction catalysts named CoNi-950 (Zn) were successfully synthesized, using a metal–organic framework (MOF) as a carbon precursor and a nitrogen source. The experimental results show that CoNi-950 (Zn) exhibits good ORR catalytic performance with an ultimate current density of 6.27 mA cm–2, which even exceeds that of some Pt/C catalysts with a mass loading of 20 wt % (5.92 mA cm–2). In addition, the active site of the catalyst was also identified by acid leaching and SCN– poisoning experiments, showing two sites in the form of CoNi-Nx and the CoNi alloy or its oxides in the material. Further experiments demonstrate that these two active sites have distinct ORR catalytic mechanisms, generating positive synergism in ORR. A mechanism in which O2 was catalytically reduced by CoNi-950 (Zn) in a four-electron transfer, i.e., a continuous two-step dual-electron transfer reduction process in alkaline electrolytes, is proposed.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Tian Zheng,Huanan Yu,Junhong Ruan,Haotuo Wang,Xiaopeng Shi,Jingji Zhang,Sina Chen,Xusheng Wang,Dongdong Xu,Ying Wang
Electromagnetic wave (EMW) absorption materials play a crucial role in mitigating electromagnetic pollution and advancing stealth technology. In this study, we construct ultralight CoNi-MOF@graphene heterostructure aerogel by integrating a trace amount of 1D rod-like CoNi-MOF with graphene. This ultralow doping strategy (4.5 wt%) integrates the anisotropic characteristics of 1D CoNi-MOF nanorods, the hierarchical porous structure derived from graphene, and the presence of heterogeneous interfaces, thereby enabling both impedance matching and multi-scale EMW attenuation. As a result, the CoNi-MOF@graphene aerogel demonstrates outstanding EMW absorption performance, achieving a minimum reflection loss of −42.62 dB and a broad effective absorption bandwidth of 4.20 GHz at a thickness of just 1.5 mm. This study offers valuable insights into the design of high-performance microwave absorbers and facilitates the development of novel functional materials.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 2
·113
·
IF 3.8
Hongzhi Ding,Chenyu Yang,Congyan Jiang,Wei Luo,Qiuyue Wang,Xuefeng Guo
The use of eco-friendly biomass as a resource is an efficient way to address the problems of fossil fuel depletion and climate change. In biomass conversion, versatile γ-valerolactone (GVL) is generally obtained from levulinic acid (LA) hydrogenation via a multimetallic catalyst system. Despite conversion efficiency being enhanced in mild conditions due to metal interactions, maintaining high catalyst stability is still a challenge. In this study, we synthesized a surrounded Co0.52Ni0.48@Al2O3-IE catalyst that exhibited excellent alloying and synergistic interaction between the metal constituents. Under relatively mild reaction conditions, the GVL yield over the catalyst exceeded 99% in LA hydrogenation. The catalyst showed no deactivation in a test of five cycles, displaying superiority in stability, possibly due to reasons of the physical isolation of the shell and the alumina retention on the Co-Ni alloys surface caused by the reversibility of exchange equilibrium. The present work demonstrated that a surrounded structured catalyst fabricated by ion exchange (IE) with active metals physically enclosed can lead to high catalytic activity and superior stability.
研究领域:
催化化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 20
·3194-3201
·
IF 4.568
Jun Wu,Xinyue Yan,Wenrui Wang,Ming Jin,Yuhang Xie,Chengbing Wang
Graphical Efficient, stable, and low-cost N-doped graphitic carbon embedded CoNi bimetallic alloy nanocatalysts were developed for the catalytic transfer hydrogenation of biomass-derived furfural to value-added furfuryl alcohol with isopropanol as hydrogen donor. The synergy enabled by bimetallic alloys and abundant N-based Lewis-base sites and surface Co−N active species were responsible for the excellent catalytic performance. The development of efficient, stable, and cost-effective heterogeneous catalysts for catalytic transfer hydrogenation (CTH) of biomass-derived furfural (FAL) is highly desired. Herein, series of N-doped graphitic carbon embedded CoNi bimetallic alloy nanoparticles were fabricated and used for the CTH of FAL to value-added furfuryl alcohol (FOL) with renewable isopropanol as hydrogen donor. Intrinsic catalytic activity examination indicated the catalytic performance of Ni x Co y @NGC (x:y=1 : 3, 1 : 1, 3 : 1) nanocatalysts were sensitive to their chemical compositions. The optimal Ni 1 Co 1 @NGC nanocatalyst with Ni/Co mole ratio of 1 : 1 afforded a largest FOL yield of 89.3% with nearly full conversion of FAL. The synergistic effect enabled by bimetallic alloys and the abundant N-based Lewis base sites and surface Co−N active species were revealed based on systematic structural characterization, responsible for the excellent catalytic efficiency of bimetallic Ni 1 Co 1 @NGC nanocatalyst for CTH of FAL.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Xiaojuan Feng,Yanlong Shi,Jingmei Liang,Wei Li,Xuyuan Gou
Exploring high activity, stable and low-cost electrocatalysts are of great importance for high-efficient hydrogen production via water splitting. Herein, a cactus-like Fe, P co-doped CoNi-S array was constructed via facile hydrothermal reaction and subsequently sulfuration and phosphorization process. Benefiting from the strong synergistic effects of different components, high conductivity of bimetallic sulfide, 3D cactus-like architecture with rich channels for mass/charge transport, and Fe and P co-doping with electron structure regulation, the as-prepared Fe, P-NiCo 2 S 4 /NF presents superior electrocatalytic activity with low overpotentials of 139 and 290 mV to drive the current density of 10 and 40 mA cm −2 for HER and OER, respectively. Meanwhile, it also manifests the distinguished durability for over 60 h in alkaline media. Notably, when integrating in a two-electrode electrolytic cell with Fe, P-CoNi-S, a reduced operation voltage of 1.55 V is required to reach 10 mA cm −2 , which is superior to precious metal-based Pt/C/NF//RuO 2 /NF counterparts. Impressively, it can also be driven by sustainable solar and thermal energies motivated Stirling engine. This work offers a universal strategy for designing high-activity and durable electrocatalysts by dual doping heteroatoms and synergistic interface engineering.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 69
·43689-43699
·
IF 3.108
Shengshuai Gao,Nan Zhou,Qingda An,Zuoyi Xiao,Shangru Zhai,Zhan Shi
Hetero-structured functional materials with tailored composition that can provide excellent electromagnetic wave (EMW) absorption with minimal thickness are highly desirable, especially if they can be easily fabricated. Herein, novel hetero-structured CoNi–CuO composite microspheres were fabricated via a facile solvothermal process. The composites with adjusted mass ratios of CuO to CoNi alloy (5/1, 2.5/1 and 1.25/1) were facilely achieved by modulating the quantity of CuCl2·2H2O during the synthesis. It was demonstrated that the enhanced microwave absorption properties could be ascribed to the dielectric CuO, which can favorably increase the interface of the hetero-structure and the impedance matching with CoNi alloyed particles. It was shown that, when the molar ratio was 2.5 : 1, the typical CoNi–CuO composite microspheres presented a promising microwave absorption performance, namely a maximum reflection loss (RL) of −25.1 dB at 13.2 GHz with a thickness of only 2.5 mm, while the effective microwave absorption bandwidth (RL < −10) could reach 3.4 GHz (from 10.0 to 13.4 GHz). As is demonstrated, this kind of newly fabricated CoNi–CuO composite can be regarded as a promising candidate for high-performance microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）