FUEL
·
2023
·
IF 7.4
Jie Yu,Zhuoran Hou,Huayu Zhang,Xinsheng Zhou
The fabrication of electrode materials with a high specific capacitance is essential for the development of enhanced performance supercapacitors. A novel binder-free electrode material, composed of MnS/Ni 3 S 2 and Co(OH) 2 , was synthesized on nickel foam by hydrothermal, sulfuration, and electrodeposition techniques. The MnS/Ni 3 S 2 exhibited a unique flower-like structure, resulting in a high specific capacitance of 1780 F g −1 at 1 A/g. By optimizing the synthesis conditions through several characterization and electrochemical tests, the MnS/Ni 3 S 2 @Co(OH) 2 composite was obtained, which displayed an ultrahigh specific capacitance of 2495 F g −1 at 1 A/g and a capacitance retention rate of 86.1% after 5000 cycles at 10 A/g in three-electrode system. The synergistic coupling of MnS/Ni 3 S 2 and Co(OH) 2 , along with the conductive nickel foam substrate, donated towards the excellent electrochemical performance. Furthermore, the MnS/Ni 3 S 2 @Co(OH) 2 //AC asymmetric supercapacitor (ASC) device was constructed with MnS/Ni 3 S 2 @Co(OH) 2 as positive electrode, activated carbon (AC) as negative electrode and 1 M KOH solution as electrolyte, demonstrated a high energy density of 68.6 Wh kg −1 at 750 W kg −1 and excellent cycle stability with 91.2% capacitance retention after 10,000 cycles at 15 A/g. The outstanding electrochemical properties observed in both the pre-electrodeposition and post-electrodeposition samples indicate the effectiveness of reasonable design and construction of composite as a pathway for producing electrode materials with exceptional performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Guiling Ren,Jindou Hu,Kun Wang,Anjie Liu,Zhenjiang Lu,Jing Xie,Aize Hao,Yali Cao
WC-based materials are considered as a promising alternative electrocatalyst to Pt because of its similar electronic structure to Pt at Fermi level, low cost and good corrosion resistance. However, the shortcomings of easy agglomeration of WC at high temperature and its own strong W H bond leaded to its low catalytic performance. Herein, the hybrid catalyst of WC-WP/NC was prepared by a simple melting salt-assisted simultaneous phosphorylation and carbonization strategy. Excitingly, the hydrogen evolution overpotential of WC-WP/NC is much lower than that of WC/NC and WP/NC in acidic and alkaline conditions, and the stability of WC-WP/NC is significantly better than 20% Pt/C. The excellent performance is mainly attributed to the synergistically coupling of WC and WP hybrids, the rapid transfer of interface charges has changed the electronic structure of the catalyst. Furthermore, the nitrogen doped two-dimensional porous carbon nano sheets can not only increase the conductivity of the catalyst and prevent the agglomeration of nano particles, but also effectively promote the contact between electrolyte and catalyst, accelerating the HER (Hydrogen Evolution Reaction) kinetic reaction. This work provides an effective strategy for constructing a good dispersive multi-interface hybrid catalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Mingliang Cheng,Wenling Ren,Hongxia Li,Xianguo Liu,Sateesh Bandaru,Jian Zhang,Xuefeng Zhang
The contribution of shielding materials to electromagnetic interference (EMI) shielding can be divided into reflection loss and absorption loss, but the mechanism of how to coordinate their balance is ambiguous in previous studies. To this end, we propose a strategy to prepare conductive magnetic networks consisting of N-doped carbon nanotubes (NCNTs) and Ni nanoparticles in carbonized wood (CW) by chemical vapor-phase catalysis. The multi-scale collaborative coupling effect of micron-scale skeleton channels, nano-scale network gaps and atomic-scale elemental doping achieves the matching of the above two electromagnetic losses. The optimized Ni@NCNT/CW composite exhibits an average EMI shielding effectiveness (EMI-SE) of 73.7 dB with ultra-low density (0.541 g/cm 3 ) across the entire X-band (8.2–12.4 GHz), as well as fine hydrophobicity (118.6°) and fire resistance. Meanwhile, in the electromagnetic attenuation capability simulation, the absorption-reflection ratio changes from absorption-dominated to reflection-dominated with the change of structural scale, which is highly consistent with the experimental test trend. This research proposes a novel insight that multiscale collaborative coupling is an effective strategy to coordinate and optimize the shielding combination mechanism.
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
Biosensors-Basel
·
2022
·Vol. 12
·期 10
·881
·
IF 5.743
Pei Dai,Xianzhi Huang,Yaqian Cui,Lihua Zhu
Tetrabromobisphenol A (TBBPA) was one of the most widely used brominated flame retardants. However, it easily contaminates nature and harms the environment and human health during its production and use. Therefore, it is necessary to strictly control the content of TBBPA in electronics. Surface-enhanced Raman spectroscopy has the advantages of being fast and sensitive, but it is difficult to obtain the SERS spectra of TBBPA because the hydrophobic TBBPA molecule is difficult to approach with the hydrophilic surface of common noble metal SERS substrates. In the present work, a hydrophobic Cu-Ag chip was developed for the SERS detection of TBBPA. The integration of the hydrophobic interaction and the Ag-Br bonding promoted the adsorption of TBBPA on the Cu-Ag chip, allowing for SERS detection. It was observed that both the hydrophobicity and bimetallic composition of the Cu-Ag chip played important roles in the SERS detection of TBBPA. Under the optimized conditions, the low limit of detection of the established SERS method for TBBPA was 0.01 mg L−1, within a linear range of 0.1–10 mg L−1. Combined with ultrasonic-assisted extraction, the substrate could be used for the quantitative determination of TBBPA in electronic products. Compared with the HPLC-UV method used as a national standard, the relative error of the SERS method for quantifying the TBBPA content in a mouse cable and shell was ±3% and ±7.7%, respectively. According to the SERS results, the recovery of TBBPA in the spiked mouse shell was 95.6%.Keywords:tetrabromobisphenol A;surface-enhanced Raman scattering;hydrophobic interaction;bi-metal chips;synergistic coupling
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xinxi Li,Long Liu,Baoping Liu,Hanjiang Li,Wen Luo,Guoqing Zhang,Xiaofeng Zhang,Changhong Wang
Silicon holds bright promise as the anode material for next-generation lithium-ion batteries (LIBs). Unfortunately, it is limited by enormous volume expansion and fast capacity fading in long-cycling or large current density. Here, we propose an in-situ assembling path to form a stable Si nanocomposite by introducing bicontinuous TiO 2 -C layer and graphene nano-sheets, and further enhance the stability for long-term LIBs. The enhanced synergistic coupling of graphene and bicontinuous TiO 2 -C layer and introduced Ti C bond effectively improve long-cycling structural stability of Si nanocomposite for promising LIBs anode material. This anode material exhibits high capacity, long-term cycling and high-rate performance. Especially, it showed the high reversible capacities of 2147.6 mA h g −1 at 0.5 A g −1 after 800 cycles and 1328.2 mA h g −1 at 2 A g −1 after 500 cycles, which is much better than that of TiO 2 -C@Si and nano Si anodes. Moreover, the full cell including this composite anode and commercial LiFePO4 cathode exhibits a high capacity retention after 100 cycles. Our work demonstrates that this surface functionalization strategy can enhance synergistic coupling and introduce Ti C bond to regulate the stability of Si nanocomposite as long-cycling LIBs anode.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 28
·15807-15819
·
IF 12.732
Wenxi Zhao,Xiaodeng Wang,Xiaoqing Ma,Luchao Yue,Qian Liu,Yonglan Luo,Yang Liu,Abdullah M. Asiri,Xuping Sun
Pseudocapacitive electrochemical Na+-storage has been highlighted as one of the exploitable strategies for overcoming the sluggish diffusion-limited redox kinetics due to the effective structural preservation and fast ion-adsorption/desorption at the surface or quasi-surface of electrode materials. However, exploiting pseudocapacitive hosts with a micro–nano hierarchitecture and further achieving competitive pseudocapacitive contributions are still in their infancy so far. Herein, a yolk–shell NiS2/CuS hollow microspherical architecture with superb kinetically pseudocapacitive features was successfully constructed through an in situ hydrothermal sulfidation and subsequent ion-exchange route using Ni-based bimetallic (NiZn) organic frameworks (NiZn-MOFs) as a template precursor. As expected, the strongly synergistic coupling effect and hollow structural characteristic of the NiS2/CuS heterostructure enabled fast charge transfer and Na+ immigration, as well as the release of the mechanical stress/strain induced by the conversion reaction, and not unexpectedly, the NiS2/CuS electrode afforded extraordinary Na+-storage capability, including a remarkable specific capacity of 410.9 mA h g−1 after 750 cycles at 2.0 A g−1, excellent rate capability, and prolonged cyclability in terms of a remarkable 283.4 mA h g−1 even after 4200 cycles at 20.0 A g−1. More significantly, the kinetic analysis demonstrated that the electrochemical charge storage of the NiS2/CuS electrode manifested considerable pseudocapacitive contributions at all rates (90.0% to 96.9%), distinctly outperforming the previously reported NiS2-/CuS-based anodes. Furthermore, the density functional theoretical calculations suggested a fast Na+-transport kinetics and enhanced antibonding state energy level and Na2S adsorption energy due to the electronic redistribution and lattice distortion in the NiS2/CuS heterointerfaces.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）