MATERIALS TECHNOLOGY
·
2021
·
IF 3.846
Qingtang Zhang,Shaokang Ji,Chao Yan,Xiaomei Wang
Nano-Li2FeSiO4/C composites (LFS/C-325 and LFS/C-221) and nano-Li2FeSiO4 (LFS-325 and LFS-221) with controlled porosity were prepared from the nano-fumed silicas with similar particle size and different porosity. N2 adsorption/desorption analysis reveals that the porosity of nano-Li2FeSiO4/C composites and nano-Li2FeSiO4 can be tuned by the choosing nano -fumed silica and LFS/C-325 possess the highest specific surface area among the four samples. XRD indicates that both LFS/C-325 and LFS/C-221 are crystalline powders with monoclinic Li2FeSiO4 of P21. FTIR spectra show that Li-O and Si-O bonds are existed in the four samples. SEM images demonstrate that LFS/C-325 and LFS/C-221 have similar particle sizes in the range of 20 ~ 25 nm, which are distinctly smaller than those of LFS-325 and LFS-221. LFS/C-325 features the smallest particle size and largest specific area, which enables LFS/C-325 to exhibit the best electrochemical performance. The initial discharge capacity of LFS/C-325 is as high as 185.2 mAh g−1 at 0.1 C.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Raji Govindan,Xu-Jia Hong,Palanivel Sathishkumar,Yue-Peng Cai,Feng Long Gu
Metal-organic framework (MOF)-derived hybrids are promising electrode materials in electrochemical energy storage , owing to their high surface area that offers enormous redox sites and excellent conductivity. In this work, MOF-derived cerium oxide/carbon integrated with molybdenum disulfide (CeO 2 /C/MoS 2 ) hybrid is developed as an electrode material for supercapacitor . Remarkably, integration of CeO 2 /C with small amount of MoS 2 has considerably enhanced the electrochemical performance. Moreover, CeO 2 /C/MoS 2 hybrid exhibited both surface and diffusion-controlled mechanism towards charge storage. The CeO 2 /C/MoS 2 hybrid showed an outstanding specific capacitance (specific capacity) of 1325.67 F g −1 (397.70 C g −1 ) and excellent cyclic stability with capacitance retention of 92.8% after 1000 charging-discharging cycles, which is significantly higher than that of CeO 2 /C (727.49 F g −1 ) or else that of MoS 2 (300.33 F g −1 ) at 1 A g −1 . In addition, asymmetric supercapacitor (ASC) fabricated with CeO 2 /C/MoS 2 hybrid and activated carbon (AC) showed remarkable electrochemical performance with high specific capacitance (110.55 F g −1 ), excellent cyclic stability (even after 1000 cycles) and high energy density of 34.55 Wh kg −1 at a power density of 666.7 W kg −1 . Thus, MOF derived CeO 2 /C integrated MoS 2 hybrid is a potential electrode material for the ASCs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 21
·18360-18369
·
IF 2.22
Wang Mengmeng,Tao Yueming,Zhang Dongyun,Sun Guanghan,Feng Ping,Chang Chengkang
Na 3–2 x Mg x V 2 (PO 4 ) 3 /C (0 ≤ x ≤ 0.2) were synthesized by a sol–gel method. According to X-ray diffraction (XRD) Rietveld refinement and energy dispersive spectroscopy (EDS) mapping results, Mg ions were approved to occupy the Na2 (18e) site in Na 3–2 x Mg x V 2 (PO 4 ) 3 /C for the first time. The amount of Mg substitution in Na 3–2 x Mg x V 2 (PO 4 ) 3 /C was optimized. The specific discharge capacities of Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C at 10 C, 20 C, and 30 C were 98.9%, 91.5%, and 76.2% of the value obtained at 1 C, respectively. Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C exhibited the highest capacity retention of 80.3% with a discharge capacity of 77.3 mAh·g −1 after 1200 cycles at 10 C. Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C exhibited superior rate performance, resulting from a high sodium diffusion coefficient ( D Na ) of 3.91 × 10 –12 cm 2 ·s −1 and the excellent electrical conductivity (5.7 × 10 –2 s·cm −1 ). Combining the X-ray photoelectron spectroscopy (XPS) and Electrochemical impedance spectroscopy (EIS) results, the mechanism of Mg substitution was investigated. Since two Na + were replaced by one Mg 2+ , \({\mathrm{V}}_{\text{Na}}^{^{\prime}}\) was produced to maintain valence equilibrium. This phenomenon benefited Na + migration by broadening the diffusion channel in the structure of Na 3 V 2 (PO 4 ) 3 . According to the EPR results, the signal intensity of Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C was much stronger than that of Na 3 V 2 (PO 4 ) 2 /C, thus confirming the existence of \({\mathrm{V}}_{\text{Na}}^{\mathrm{^{\prime}}}\) after Mg substitution. When the amount of Mg substitution was further increased to 0.1, the D Na decreased because of the small radius of Mg 2+ , which led to severe lattice distortion and volumetric shrinkage of the unit cell.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·Vol. 32
·期 8
·2940-2949
·
IF 4.833
Shanfang Lan,Qing Hu,Qianqian Zhao,Weihui Jiang,Jianmin Liu,Guo Feng,Feng Jiang,Huidong Tang,Junhua Chen
With the increasing popularity of the black decorative ceramics, the development of black pigment with good properties has become significant for the ceramic industry. A Mn-doped zirconium silicate encapsulated carbon (C@ZrSiO 4 ) black pigment was successfully prepared via non-hydrolytic sol-gel (NHSG) method at 800 °C, while MnCl 2 and carbon-containing precursors (tetraethoxysilane, TEOS) were used as Mn and in-situ carbon sources, respectively. The results demonstrated that the L* value of black pigment first decreased and increased with the increase of MnCl 2 content. The as-prepared pigment with the MnCl 2 content of 10 mol% showed a deep dark hue ( L* = 27.64, a* = 0.67, b* = 0.68), while the pigment without Mn doping exhibited poor chromatic properties ( L * = 51.18). Moreover, XPS and EPR results indicated that the Mn(II) and Mn(IV) replaced the Zr(IV) in ZrSiO 4 , resulting in the formation of oxygen vacancies. In-situ carbon provided by TEOS incorporated into these oxygen vacancies, which can protect carbon from being oxidized. In addition, the prepared pigment exhibited higher chemical stability in acid/alkali solutions, favorable tinting strength and thermal stability in base transparent glaze, which displayed wide application prospect in the field of ceramic decoration.
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高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 14
·1942-1948
·
IF 4.568
Xiangyang Tang,Hui Liu,Futong Liu,Xin He,Xuehui Xu,Jianwu Chen,Qiming Peng,Ping Lu
Red emission is one of the three primary colors and is indispensable for full color displays. Fluorescent materials that can generate efficient red electroluminescence (EL) are limited and need to be developed. In this work, we report efficient red emitters based on phenanthro[9,10-d]imidazole-naphtho[2,3-c][1,2,5]thiadiazole donor-acceptor derivatives. The molecules, abbreviated as PINzP and PINzPCN, exhibited high photoluminescence quantum yield (PLQY) up to unity in doped films. They can also reach a relatively high PLQY of ∼30% in neat films. PINzP and PINzPCN were capable of generating efficient red EL in doped devices with a maximum external quantum efficiency (EQE) of 6.96% and 5.92%, respectively.
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高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 3
·2815-2821
·
IF 1.5
Xiang Ding,Xiaobing Huang,Shibiao Zhou,Anguo Xiao,Yuandao Chen,Chenggang Zuo,Junling Jin
Na 3 V 2 (PO 4 ) 3 (NVP) is a potential cathode material for sodium ion batteries (SIBs) due to its stable three-dimensional NASICON structure and high theoretical energy density. In this paper, the carbon-coated Na 3 V 2 (PO 4 ) 3 (NVP/C) cathode materials using pitch as carbon source were synthesized by a simple solid-state reaction method combined with microwave calcinations. The electrode performance of as-prepared NVP/C materials were investigated and the results demonstrated that the NVP/C composite with 13.1 wt.% carbon shows the best electrochemical properties. It possesses a high initial discharge capacity of 108.2 mAh g -1 , 90.5 mAh g -1 at 0.2 C and 10 C. After 1000 cycles at the rate of 10 C, the discharge capacity remained almost unchanged, with no capacity fading.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 12
·1-17
·
IF 6.4
Wei Biao,Liu Daoqing,Peng Ran,Zhou Yi,Li Qianwei,Zhao Huazhang
The remediation of nitroaromatic-contaminated water systems remains a critical environmental challenge, creating the urgent need for cost-effective, non-precious metal catalysts to increase wastewater biodegradability. In this study, we present an Fe/N-functionalized three-dimensional porous carbon (Fe–N–C) catalyst synthesized via a straightforward pyrolysis approach that enables efficient nitrobenzene (NB) degradation via electrochemical and chemical reduction pathways. The high-temperature pyrolysis process facilitates the iron-catalyzed reconstruction of the carbon matrix, resulting in a hierarchically porous structure with increased graphitization and uniformly distributed macrocyclic Fe–N 4 coordination sites. These structural features give the Fe–N–C catalyst exceptional electron transfer kinetics, catalytic activity, and pH adaptability, surpassing conventional graphite (GR) and nitrogen-doped carbons (NPCs) in NB reduction. Systematic evaluation of the electrochemical reduction performance revealed that the Fe–N–C electrode achieved the highest NB removal efficiency. To further assess the versatility of the catalyst, a functionalized Fe–N–C/zero-valent iron (ZVI) composite was engineered by integrating Fe–N–C as a catalytic layer onto the reductant ZVI. Compared with ZVI alone, this composite markedly increased the NB reduction efficiency. These findings provide valuable insights into the electrochemical reduction process of Fe–N–C and new directions for the rational design of efficient nitrobenzene reduction systems.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Peng Wei,Yanxiang Liu,Yarui Su,Ling Miao,Yangyang Huang,Yi Liu,Yuegang Qiu,Yuyu Li,Xiaoyu Zhang,Yue Xu,Xueping Sun,Chun Fang,Qing Li,Jiantao Han,Yunhui Huang
We are presenting a sol–gel method for building novel nanostructures made of nanosized F-doped Na1–2xTi2(PO4)3–xFx (NTP-Fx, x = 0, 0.02, 0.05, and 0.10) particles embedded in three-dimensional (3D) carbon matrices (NTP-Fx/C). This technique combines advantages of both zero-dimensional materials and 3D-carbon networks. Proper fluorine doping stabilizes the NTP structure and greatly enhances ion/electron transportation, leading to superhigh-rate electrochemical performance and ultralong cycle life. The composite electrode delivers high specific capacities of 121, 115, 112.2, 110.1, 107.7, 103.1, 85.8, and 62.5 mA h g–1 at 0.2, 0.5, 1, 2, 5, 10, 20, and 30 C, respectively. It retains an unbelievable ∼70% capacity after a thousand cycles at a rate as high as 10 C. Electroanalytical results reveal that fluorine doping significantly enhances Na+ diffusion kinetics. Meanwhile, density functional theory calculations demonstrate F-doped NTPs’ own outstanding electrochemical properties, which is due to the enhanced intrinsic ionic/electronic conductivity. The results show that anion doping is an efficient way to make high-performance NTP anodes for sodium-ion batteries.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2014
·
IF 2.736
Cheng-Bin Gong,Cong-Cong Guo,Dan Jiang,Qian Tang,Chang-Hua Liu,Xue-Bing Ma
This study aimed to develop a new graphene-based layered assembly, named graphene–cyclodextrin–cytochrome c with improved electron transfer rate. This assembly has combined high conductivity of graphene nanosheets (GNs), selectively binding properties and electronegativity of cyclodextrins (CDs), as well as electropositivity of cytochrome c (Cyt c). This assembly can also mimic the confined environments of the intermembrane space of mitochondria. A β-cyclodextrin (β-CD) functionalized GN (GN–CD) assembly was initially prepared by a simple wet-chemical strategy, i.e., in situ thermal reduction of graphene oxide with hydrazine hydrate in the presence of β-CD. Cyt c was then intercalated to the GN–CD assembly to form a layered self-assembled structure, GN–CD–Cyt c, through electrostatic interaction. Compared with GNs and GN–CD, GN–CD–Cyt c assembly displayed improved electron transfer rate and high supramolecular recognition capability toward six probe molecules.
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高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yuhan Jiang,Fang Zhao,Xiang Wu,Lingmu Zeng,Luwei Yang,Linlin Guan,Yang Ren,Xiaowei Zhou,Zhu Liu
An abnormal capacity increase stage has been observed in nanostructured SiO2 after the initial capacity drop stage. To investigate the Li+ storage kinetic mechanism for each stage, SiO2@C core–shell nanospheres with a total diameter of ∼108 to 170 nm but an adjustable C shell thickness of ∼4 to 31 nm have been fabricated. First, the existence form and specific content of SiO2 nanoparticles with a size of ∼6–10 nm, which are embedded in the outer C shell of SiO2@C core–shell nanospheres, were confirmed by SEM, TEM, BET, and TGA, respectively. It was found that the initial stage for capacity drop happens at 15–43 cycles and is followed by an enhancement stage, which presents an increase of ∼120 to 180% in capacity relative to the lowest capacity value during cycling. Among them, the sample of P-1 with a diameter of 109 nm for the SiO2 core and thickness of 31 nm for the C shell delivers the highest specific capacity of 1060 mAh/g at 100 mA/g and a capacity increase rate of ∼180% through 300 cycles. XPS analysis for the delithiation process indicates that the capacity drop and increase stage involves the partial oxidation of Li silicate, which is correlated to the formation of Li2Si2O5. Our study can be used to explain the mechanism of the abnormal capacity increase phenomenon for the SiO2 anode and provide a high-capacity anode material for LIB application.
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高影响因子
Sensor Letters
·
2014
·Vol. 12
·期 11
·1607-1612
·
IF 0.558
Cai Meizhi,Shi Wenxiu,Zhu Lei,Du Xiaoyan,Chang Dong
An electrochemical sensor was developed based on hyaluronic acid (HA)-doped polypyrrole (PPy) modified glassy carbon electrode (GCE), and applied to the determination of vitamin C. The HA-PPy modified GCE was constructed by doping HA during the electropolymerization of PPy on GCE. The
modified electrode was characterized by scanning electron microscope, cyclic voltammetry and electrochemical impedance spectroscopy. Several important parameters of the sensor were investigated and optimized. The results showed that doping HA in the polymerization of pyrrole could induce the
linear polymerization process of pyrrole and a perfect nanowire of PPy was obtained. The results also showed that the electrochemical performance of the HA-PPy modified electrode significantly depended on the doping dose of NaHA as a dopant. Compared with bare GCE and PPy modified GCE, HA-PPy
modified GCE revealed higher redox current to the electroactive compounds and smaller resistance in K3 [Fe(CN)6] solution. Under the optimal conditions, the HA-PPy modified GCE showed a wide linear range from 1.0 × 10–4 to 1.0 × 10–1
mol/L with a detection limit of 6.9 × 10–6 mol/L for the voltammetric determination of vitamin C. The HA-doped PPy modified electrodes showed significant improvement for the electrochemical characteristics, and this sensor is successfully applied to determination of
vitamin C.
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高影响因子
Research
·
2021
·
IF 0
Zhuanghe Ren,Xin Zhang,Hai-Wen Li,Zhenguo Huang,Jianjiang Hu,Mingxia Gao,Hongge Pan,Yongfeng Liu
Sodium alanate (NaAlH 4 ) with 5.6 wt% of hydrogen capacity suffers seriously from the sluggish kinetics for reversible hydrogen storage. Ti-based dopants such as TiCl 4 , TiCl 3 , TiF 3 , and TiO 2 are prominent in enhancing the dehydrogenation kinetics and hence reducing the operation temperature. The tradeoff, however, is a considerable decrease of the reversible hydrogen capacity, which largely lowers the practical value of NaAlH 4 . Here, we successfully synthesized a new Ti-dopant, i.e., TiH 2 as nanoplates with ~50 nm in lateral size and ~15 nm in thickness by an ultrasound-driven metathesis reaction between TiCl 4 and LiH in THF with graphene as supports (denoted as NP-TiH 2 @G). Doping of 7 wt% NP-TiH 2 @G enables a full dehydrogenation of NaAlH 4 at 80°C and rehydrogenation at 30°C under 100 atm H 2 with a reversible hydrogen capacity of 5 wt%, superior to all literature results reported so far. This indicates that nanostructured TiH 2 is much more effective than Ti-dopants in improving the hydrogen storage performance of NaAlH 4 . Our finding not only pushes the practical application of NaAlH 4 forward greatly but also opens up new opportunities to tailor the kinetics with the minimal capacity loss.
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危险品化学品经营许可证（带存储）