JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yan Wang,Chongmei Wu,Guiyang Xian,Zhaolin Zhu,Yin Liu,Ling Bing Kong
Polyaniline-derived carbon (PDC) and Ni 3 Fe composites for electromagnetic wave (EMW) absorption were prepared through in-situ polymerization and carbonization. Using polyaniline as carbon source not only realized the doping of carbon with nitrogen, but also allowed homogeneous dispersion of Ni 3 Fe nanoparticles to achieve multiple reflection interfaces. The content of Ni 3 Fe can be used to control the impedance matching of the composites, while the dual loss mechanism of dielectric loss and magnetic loss was realized to promote EMW absorption performance. The polyaniline-derived carbon/Ni 3 Fe (PDC/Ni 3 Fe) nanocomposite with optimized composition had a minimum reflection loss (RL) of − 80.91 dB. A maximum effective bandwidth of 6.10 GHz (11.90 −18.00 GHz) was achieved, while the thickness is 2.12 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
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IF 7.632
Hong Liu,Peng Zeng,Yongfang Li,Hao Yu,Manfang Chen,Sidra Jamil,Changqing Miao,Gairong Chen,Qi-Cheng Liu,Zhigao Luo,Xianyou Wang
The merit of high energy density endows the lithium sulfide (Li2S)-based lithium–sulfur batteries (LSBs) as a promising candidate for next-generation energy storage batteries. In this work, Li2S is chemically anchored onto the surface of two-dimensional graphene oxide (GO), which is then tangled and connected by one-dimensional carbon nanotube (CNT) to promote electron transfer, and finally further embedded with PANI-derived carbon (PDC) to suppress a polysulfide shuttle. The deliberately designed carbon matrix offers a fast electron and ion transfer route, suitable surface area, void volume, and pore size for redox reactions and polysulfide confinement. Furthermore, PDC could synergistically immobilize polysulfides inside the cathode by means of chemisorption so as to restrain the shuttle effect in LSBs. Last but not least, PDC with a quinone-based structure could function as a redox mediator (RM) to facilitate Li2S oxidation with minimized polarization. Benefited from the aforementioned advantages, the as-fabricated Li2S-GO/CNT/PDC composite, which is coupled with a lithium metal as the anode, delivers initially a high specific capacity of 925 mAh g–1 at 0.1 C and good retention capability of 550 mAh g–1 after 400 cycles at 2 C. Therefore, the good electrochemical behavior of the Li2S-GO/CNT/PDC composite suggests its promising prospects for the commercial application of LSBs in high-energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
FUEL
·
2022
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IF 8.035
Junhong Ma,Zhizi Yao,Tuan K.A. Hoang,Yuemei Liu,Akang Sun
As a clean energy conversion device, fuel cell can greatly alleviate the environmental pollution problem. Developing cost-effective oxygen reduction reaction (ORR) catalysts with high performance is of great significance to improve the efficiency of fuel cells and promote its large-scale use. Here, we successfully fabricated an iron and nitrogen co-doped carbon–carbon composite (Fe-N-C B350 -900Z@C PANI ) by modifying a pre-synthesized iron and nitrogen co-doped biomass carbon (Fe-N-C B350 -900Z) with polyaniline derived carbon (C PANI ). The obtained Fe-N-C B350 -900Z@C PANI displays excellent ORR catalytic activity, as reflected by the positive onset potential of 0.13 V vs Hg/HgO and high limiting current density of 5.92 mA cm −2 , which significantly outperforms the benchmark Pt/C (0.07 V and 4.70 mA cm −2 , respectively). Meanwhile, it also presents remarkable catalytic stability and the great methanol tolerance. The excellent catalytic performance of Fe-N-C B350 -900Z@C PANI is attributed to the merits of the hierarchical porous structure and large specific surface area up to 955 m 2 g −1 formed by synergism of C B and C PANI , which effectively promotes the mass transfer and accessibility of active sites.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Jihan Li,Jihui Zhang,Weiliang Liu,Mei Li,Jinshui Yao,Yuanhao Wang,Manman Ren
Lithium-sulfur batteries (LSBs) have attracted wide attention in the field of rechargeable batteries due to their high theoretical energy density. However, the severe “shuttle effect” of lithium polysulfides (LiPSs) and the slow conversion kinetics are key factors restricting the commercial application of LSBs. To address these issues, we designed and prepared a coral-like composite of CoP-modified polyaniline-derived carbon chain skeleton (CoP/C) as the sulfur host for LSBs. The carbon chains can provide multidirectional channels for the transport of Li + and electron; and the uniformly scattered CoP can adsorb the LiPSs through chemical adsorption and simultaneously promote their conversion, thus the “shuttle effect” can be effectively alleviated. Meanwhile, the effect of the amount of aniline monomer on the electrochemical performance of sulfur cathode were studied. After sulfur loading, the CoP/C-300/S (with aniline monomer addition of 300 μL) exhibits the best electrochemical performance. At 1 C, after 500 cycles, it still maintains a reversible specific capacity of 478 mA h g −1 , with a decay rate of 0.074% per cycle, indicating its excellent cycling stability. This work provides a new approach for the application of CoP material in advanced LSBs.
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
SOLID STATE COMMUNICATIONS
·
2021
·
IF 1.804
Shaohui Su,Jiahao Yu,Xianguo Liu,Jieyi Yu
Magnetic-dielectric composites attract numerous attentions for good microwave absorption performances based on magnetic-dielectric loss mechanism and tunable electromagnetic parameters. Fe/carbon fibers are prepared through carbonization of Fe doped polyaniline nanotubes , in which Fe nanoparticles are embedded in carbon fibers. The introduction of Fe nanoparticles results in good electromagnetic impedance and proper quarter-wavelength cancellation induced, which ensure that microwave penetrate composites to the great extend and is consumed as much as possible, leading to enhanced microwave absorption performance. The minimal reflection loss of Fe/carbon fibers composites starts being less than −10 dB from 1.7 mm and is up to −44.09 dB at 6.62 GHz and 4.1 mm and the effective bandwidth reaches 6.0 GHz with 2.4 mm.
研究领域:
材料科学
·
电磁学
·
纳米复合材料
·
功能材料
·
微波工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）