Materials Today Nano
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2025
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IF 8.2
Haotian Jiang,Yanxiang Wang,Chengjuan Wang,Shichao Dai,Bohan Ding,Jinghe Guo,Yue Sun,Dongming Liu,Hui Li
Exploring the synergistic effects of components and structures has emerged as a pivotal strategy for advancing high-performance electromagnetic wave (EMW) absorbing materials. In this work, we present an approach that integrates magnetic-dielectric components and porous structures by incorporating unidirectionally frozen-drying aramid nanofiber aerogels with ZIF-67 and subsequently preparing Co/Co 3 O 4 @carbon nanotubes/carbon nanofibers aerogels through heat treatment and catalyst chemical vapor deposition. By combining different functional components, a multiple heterostructure with excellent absorption capacity, wide effective absorption bandwidth (EAB), and thin thickness can be achieved. The inclusion of the magnetic-dielectric component significantly enhances the impedance matching, generating multiple loss mechanisms. Additionally, the three-dimensional porous structure of the aerogel facilitates multiple reflections and scattering of the incident EMWs, thereby enhancing the microwave absorption. Specifically, the obtained samples exhibit outstanding EMW performance, with a minimum reflection loss of −73.50 dB at a thickness of merely 2.08 mm and an EAB of 5.90 GHz. Furthermore, simulations evaluating radar cross-section values, electric field strengths, and energy loss density are conducted to assess the stealth capabilities under radar detection. This study culminates in the preparation of an aerogel characterized by excellent wave-absorbing properties and effective thermal insulation, offering vast potential for practical applications.
研究领域:
材料科学
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电磁学
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化学工程
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DOI
高影响因子
IONICS
·
2021
·Vol. 28
·期 2
·635-645
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IF 2.817
Zhao Wei,Feng Wangjun,Chen Jingzhou,Huang Zhaoyu
Lithium-sulfur batteries (LSBs) are considered the most likely replacement for conventional lithium–ion batteries in next-generation high-energy output solutions based on their high specific capacity (1675 mAh g −1 ) and high-energy density (2600 Wh kg −1 ). But, there are some problems that need to be solved urgently. In this work, an environmentally friendly, green, and low-cost ZIF-67-derived cobalt-based sulfate material (CoSO 4 ) combined with carbon nanotubes was proposed as a sulfur host material. Experiments show that the addition of CoSO 4 can significantly enhance the transformation of polysulfide and suppress the shuttle effect. The best performance is the CNT-CoSO 4 -2/S, which has an initial capacity of 1356.9 mAh g −1 at 0.1 C current density. Furthermore, long-term cycle test was carried out at a current density of 0.2 C; the coulombic efficiency was above 98.63% after 200 cycles. This work demonstrates the potential of cobalt-based sulfates as cathode materials for lithium–sulfur batteries.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Xingnian Duan,Jianmei Cen,Xiaoyu Qiu,Xixiang Liu
The development of high-performance and cost-effective electrocatalysts for oxygen evolution reactions (OER) is key to renewable energy conversion and storage technologies. In this paper, a hierarchical Co(OH) 2 -MoO 3 nanosheets with petal-like architecture was prepared by a simple one-step hydrothermal method using ZIF-67/NF as a precursor, and it was used as a direct electrocatalyst for OER. Notably, this petal-like Co(OH) 2 -MoO 3 /NF layered nanosheets not only prevent the agglomeration of nanostructured material , but also facilitate the complete penetration and diffusion of electrolyte. In addition, due to the strong electronic interaction between Co(OH) 2 and MoO 3 in the Co(OH) 2 -MoO 3 /NF system, Co(OH) 2 -MoO 3 /NF exhibits excellent electrocatalytic OER performance. It has a low overpotential of 273 mV at 10 mA cm −2 and excellent stability. This study provides a simple and effective strategy for the rational design and structural evolution of MOF-derived materials to achieve inexpensive and effective electrocatalysis.
研究领域:
材料科学
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能源化学
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电催化
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
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IF 5.4
Yuhan Wang,Kaifeng Wang,Qitan Zheng,Haochang Chen,Hua Li,Lei Yang,Yujie Chen,Hezhou Liu
Cobalt/nitrogen-doped carbonaceous particles were synthesized by the calcination of zeolitic imidazolate frameworks (Co-ZIF-67) at different heating rates. Their morphology, composition, and electromagnetic properties were measured. It was found that the structure and morphology of the derivatives were easily controlled by adjusting the heating rate. At a low heating rate, the derivatives retained their original shape, and smaller Co nanoparticles were formed. Consequently, more carbon nanotubes were formed, and the degree of graphitization improved, building a 3D conductive network. At a much higher heating rate, most of the carbon skeleton was destroyed; however, the smaller fragments endowed the samples with more conductive pathways because of the percolation and tunnel effects, increasing the dielectric loss. At a filler loading of 30%, the nanocomposites prepared at a heating rate of 1 °C/min exhibited the optimal reflection loss, −70.76 dB, at a thickness of 3.46 mm and an effective absorption bandwidth of 12.4 GHz.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
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IF 6.216
Qinghua Wang,Feng Gao,Biyan Xu,Fuxian Cai,Fengping Zhan,Fei Gao,Qingxiang Wang
In this paper, unique amorphous bimetallic sulfides of CoNi 2 S 4 with nanocage structure were synthesized. The ZIF-67 with typical rhombic dodecahedron structure was first synthesized, and then the bimetallic product was achieved by the ingenious combination of Ni 2+ -induced template scarification of the synthesized ZIF-67 and the sulfuration reaction. The characterization assays showed that the CoNi 2 S 4 nanocages perfectly inherited the rhombic dodecahedral morphology of the ZIF-67, but with many vertical aligned nanosheets on the shell. The CoNi 2 S 4 nanocages were utilized as an electrode material for capacitance test. The results revealed that the synthesized CoNi 2 S 4 nanocages have low charge-transfer resistance, and high specific capacitance of 1890 F g −1 at a current density of 4 A g −1 . The specific capacitance remains 89.9% and 71.6%, respectively after 1000 and 5000 cycling charge-discharge measurements. This excellent performance can be ascribed to the amorphous nature, unique hollow nanocage structure and bimetallic composition of the product. Furthermore, an asymmetric supercapacitor was assembled using CoNi 2 S 4 nanocages as positive electrode materials and Yolk-Shell carbon spheres (YS-CS) as negative electrode materials, and the resulting CoNi 2 S 4 //YS-CS device exhibits a high energy density of 35 Wh kg −1 at a power density of 640 W kg −1 .
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
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IF 5.3
Haixia Zhang,Wenyuan Dai,Ru Liu,Junying Xiang,Yanhui Song,Ying Hou,Hong Wei,Peizhi Liu,Bingshe Xu,Jianguo Liang,Junjie Guo
ZIF-67-derived Co–N–C catalysts exhibit efficient water-splitting performance and thus have attracted intense research interest. However, the serious Co agglomeration and loss of most N atoms due to high-temperature pyrolysis limit the further improvement of their electrocatalytic performance. Herein, we report a ZIF-67-derived 2D porous N-doped carbon nanosheet decorated with a Co nanoflake catalyst (Co@NC/CC-500) for OER and HER by a facile pyrolysis method at a low temperature of 500 °C. Benefiting from the ultrahigh N doping (12 atom %) and uniformly dispersed Co nanoflakes on 2D porous carbon nanosheets, which lead to a high content of Co–N active sites, the Co@NC/CC-500 catalyst exhibits outstanding performance toward the HER and OER with overpotentials of 95 and 183 mV at 10 mA cm–2 in 1 M KOH, respectively. Furthermore, the alkaline water electrolyzer using Co@NC/CC-500 as the cathode and anode catalysts can achieve a current density of 10 mA cm–2 at a cell voltage of 1.52 V. This special low-temperature production method may be extensively utilized to create precisely defined monometal or bimetal nanoflakes decorated on 2D porous N-doped carbon nanosheets for diverse electrochemical energy applications.
研究领域:
材料科学
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电化学能源
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 19
·7561-7570
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IF 4.569
Wenhao Liao,Xianfeng Tong,Yali Zhai,Haojiang Dai,Yingyan Fu,Min Qian,Geng Wu,Tianyun Chen,Qinghua Yang
In order to lower energy consumption it is critical to develop highly efficient and stable non-precious metal bifunctional catalysts. In this study, we found that rational design of novel nanostructures is able to increase the number of active sites, conductivity and accelerate electron transfer, thus promoting enhanced performance of the catalyst. We successfully synthesized carbon nanotubes (CNTs) containing a hollow polyhedral (CNTHPs) structure through annealing, etching and phosphating. The unique hollow shape not only provides a stable structure but also facilitates mass and charge transfer. Thus, CoP/CNTHPs can catalyze the hydrogen and oxygen evolution reactions effectively with overpotentials of 147 and 238 mV at 10 mA cm−2. Simultaneously, CoP/CNTHPs only needs a voltage of 1.54 V to attain a current density of 10 mA cm−2 in the electrocatalytic water splitting process, demonstrating its bifunctional activity. Furthermore, the electrolytic catalytic performance does not weaken significantly after 12 hours of electrolysis, demonstrating excellent stability. Overall, this research offers useful insights into rational design of high-performance non-noble metal catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2022
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IF 11.307
Shunzhe Zhang,Kaifeng Wang,Haochang Chen,Hezhou Liu,Lei Yang,Yujie Chen,Hua Li
Transition metal sulfides (TMSs) have become promising candidates as electrode materials in energy storage fields thanks to the high theoretical capacity. However, their application is hindered by depressed electrical conductivity and poor cycling performance. Herein, we proposed a ZIF-67 derived, nitrogen-doped, graphene-coated and carbon nanotubes-interlinked 3D Co 3 S 4 /C conductive network (N–Co 3 S 4 -GN/CNT) for high-performance supercapacitors . Through controlling the mass ratio of ZIF-67, melamine and g-C 3 N 4 , various microstructures with determined electrochemical performance could be achieved. The nanocomposites synthesized with the ingredient mass ratio of 2: 1: 1 (NCSC-211) were proven to have the most excellent comprehensive electrochemical properties . In the NCSC-211 nanostructure , multi-layer graphene function as conductive shells for improved cycling performance by alleviating pulverization caused by volume change, thick CNTs act as conductive bridges and agglomeration spacers that increase electron conductivity and provide more active sites for redox reaction and doped-nitrogen offer enhanced wettability to electrolyte and faster electron transfer . The NCSC-211 electrode displayed specific capacitance of 1158 F g −1 at 1 A g −1 , rate capability of 86% at 10 A g −1 and extraordinary cycling stability with 97.2% capacitive retention after 4000 cycles. Furthermore, the assembled asymmetric supercapacitor NCSC-211//activated carbon exhibited energy density of 43.73/37.69 Wh kg −1 at power density of 800/8000 W kg −1 and capacity retention of 95.3% after 5000 cycles at 5 A g −1 . The designing strategy of in-situ grown instead of additional added conductive phase that fully-covered and strongly-interlinked network nanostructure may pave the road towards TMSs in synthesizing energy storage materials by compensating their intrinsic drawbacks.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 33
·期 6
·065409
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IF 3.874
Wenwen Zhang,Ximeng Zhao,Weixing Niu,Hang Yu,Tongtao Wan,Guihua Liu,Dongsheng Zhang,Yanji Wang
The slow kinetic of oxygen reduction reaction (ORR) hampers the practical application of energy conversion devices, such as fuel cells, metal-air batteries. Here, an efficient ORR electrocatalyst consists of Co, Ni co-decorated nitrogen-doped double shell hollow carbon cage (Ni–Co@NHC) was fabricated by pyrolyzing Ni-doped polydopamine wrapped ZIF-67. During the preparation, polydopamine served as a protective layer can effectively prevent the aggregation of Co and Ni nanoparticles during the pyrolysis process, and at the same time forming a carbon layer to grow a double layer carbon cage. This unique hollow structure endows the catalyst with a high specific surface area as well as more exposed active sites. Also benefited from the synergistic effect between Ni and Co nanoparticles, the Ni–Co@NHC catalyst leads to an outstanding ORR performance of half-wave potential (E1/2, 0.862 V), outperforms that of commercial Pt/C catalyst. Additionally, when Ni–Co@NHC was used in the cathode for the zinc-air battery, the cell exhibits high power density (108 mW cm−2) and high specific capacity (806 mAh g−1) at 20 mA cm−2 outperforming Pt/C. This work offers a promising design strategy for the development of high-performance ORR electrocatalysts.
研究领域:
材料科学
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电化学
·
能源转换技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
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IF 7.3
Cong Yong,Yipu Xu,Hui Yu,Peiran Wu,Jiansong Wang,Liu-Liu Shen,Gui-Rong Zhang,Donghai Mei
ZIF-derived carbons (ZDCs) represent a novel category of non-precious metal catalysts (NPMCs) for the oxygen reduction reaction (ORR). Nevertheless, establishing the correlation between their structure and performance is challenging due to their diverse structural properties and ill-defined active site moieties. Here we investigate the effect of ZIF-67 derived carbon’s particle size and corresponding distribution of assorted nitrogen functionalities on the ORR. Our findings reveal a substantial increase in ORR activity with decreasing ZDC particle size, while the exact influence of nitrogen functionalities remains uncertain. Most importantly, the present work unveils a correlation between the ORR activity and the site density (SD) of Co-N x within the ZDC materials, which can be attributed to the concurrently increasing SD and accessibility of Co-N x on the ZDC particles with small sizes. The present work provides novel insights into the optimization of ZDCs as high-performance NPMCs for ORR in alkaline electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Lidong Jiao,Mingshu Zhao,Zhou Su,Mangmang Shi,Min Li,Feng Li
Supercapacitors have received widespread attention from scientific researchers due to the advantages of high power density, fast charging/discharging rate and long cycle life. Among them, the development of high performance and high safety electrode materials are important research topics in the field of supercapacitors. Herein, zeolitic imidazolate framework (ZIF) derivatives is a good candidate material for supercapacitors electrode because of its controllable pore rate, constant cavity and larger specific area. However, the reunion phenomenon and the damaged structure during the reaction seriously affected its electrochemical properties, especially its stability. To solve this problem, the few-layer MXene was added into ZIF-67 to inhibit the reunion of single materials and the carbonization process was operated to improve its conductivity and structure stability. In addition, the CoNi 2 S 4 /carbon/MXene (CNS/C/MXene) obtained by the solvent thermal method successfully inherited the hollow cages structure and rough surface from the precursor, expressing a better electrochemical performance. In three-electrode system, the CNS/C/MXene electrode can exhibit the specific capacitance of 1221.6 F g −1 (169.7 mAh g −1 ) at 1 A g −1 and still maintain a high capacitance of 966.4 F g −1 (134.2 mAh g −1 ) at 20 A g −1 (79.1 % of the former). After assembling it with activated carbon into asymmetric supercapacitor, the device can provide a high energy density of 19.82 Wh kg −1 at a power density of 469.31 W kg −1 and maintain about 71.17 % of the initial capacitance after 30,000 cycles under a current density of 20 A g −1 , representing excellent cycle stability and rate capability.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Hongtao Zhou,Xuefeng Sha,Fan Zeng,Xueli Wu,Minghao Yu,Zhidan Shi,Xingang Zhang,Xianyin Song,Changzhong Jiang
Nickel–cobalt layered double hydroxide (NiCo-LDH) is a promising electrode material for supercapacitors due to its high electrochemical activity. However, it easily restacks and aggregates due to its nanosheet structure, which limits the effective utilization of redox active sites. Herein, the NiCo-LDH nanosheets derived from ZIF-67 were in situ grown on the surface of a basic copper cobalt carbonate (CoCu) urchin-like skeleton and supported by nickel foam (CoCu@NiCo-LDH). The well-designed three-dimensional (3D) hierarchical nanostructure not only effectively prevents the aggregation of NiCo-LDH nanosheets, but also provides a rapid charge transport channel, which facilitates ion diffusion and electron transport, therefore enhancing the utilization of NiCo-LDH redox active sites to a greater extent. Besides, the synergistic interactions between NiCo-LDH nanosheets and CoCu nanoneedles further enrich the redox reactions and increase the electrical conductivity and reaction kinetics of the electrode at the same time. As a result, the CoCu@NiCo-LDH electrode exhibits outstanding electrochemical performance with an ultrahigh mass loading of 14 mg cm−2, including excellent specific capacitance (18.71 F cm−2 or 1346 F g−1 at 3 mA cm−2) and distinguished rate capability of 87.3% from 3 mA cm−2 to 50 mA cm−2. When the CoCu@NiCo-LDH electrode was assembled with active carbon (AC) to form an asymmetric supercapacitor (ASC), the CoCu@NiCo-LDH//AC ASCs display outstanding energy density (1.98 mW h cm−2) and power density (97.5 mW cm−2) with excellent cycling stability (86.0% initial capacitance after 5000 cycles), and could keep an LED light bulb working for 90 min after only charging for 60 s. This work provides an effective strategy for the design and application of layered double hydroxide based pseudocapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 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）