DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 32
·11030-11038
·
IF 4.39
Xinhao Cai,Huihui Yan,Zhengwei Yang,Wenru Li,Haoxiang Yu,Lei Yan,Liyuan Zhang,Miao Shui,Yanhua Cui,Jie Shu
With the development of electric vehicles, more and more attention has been paid to the kinetic performance of batteries, which is related to rapid charge/discharge and safety issues. To improve this aspect, Cu2Nb34O87 nanowires covered by nitrogen and sulfur co-doped carbon (Cu2Nb34O87/NSC nanowires) are prepared by electrospinning combined with surface coating. As-prepared Cu2Nb34O87/NSC nanowires present a high ion diffusion coefficient and electronic conductivity, showing good a kinetic performance. Specifically, they deliver a splendid capacity of 311.2 mA h g−1 at 1 C and a superior cycling stability with a capacity fading of 0.031% per cycle upon 1000 cycles. At the same time, the electrochemical and structural reversibility is fully discussed and demonstrated by ex situ XRD, ex situ SEM and ex situ XPS based on the redox couples of Cu2+/Cu+, Nb5+/Nb4+, and Nb4+/Nb3+. Contributing to peculiar physico-chemical properties, Cu2Nb34O87/NSC nanowires are expected to be a candidate material for the anode in lithium-ion batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 3
·964-977
·
IF 3.5
Zhu Q.,Wei S.,Wang C.,Yang X. B.,Zhou B.,Xie Z. X.,Duan Z. Q.,Hu Y. M.
Unique wool-ball shaped nanocrystalline CoS was synthesized using solvothermal method in which dopamine (DA) was added as carbon source to combine with the CoS. The DA in situ polymerized and coated on the CoS particle surfaces during the solvothermal process. N, S co-doped carbon-encapsulated CoS(Co 9 S 8 ) were achieved after a post carbonization. In the composites, CoS(Co 9 S 8 ) nanocrystals and carbon are tightly bound and embedded into the amorphous carbon layer to form a spherical core–shell structure. Hybrid counter electrodes (CEs) fabricated with the product have good conductivity, dispersion and stability due to the synergetic effect between carbon and nanocrystalline CoS(Co 9 S 8 ). Charge transfer through the CE/electrolyte interfaces is improved by dopamine-carbon combination. In the optimal case, PCE of 8.82% of the dye-sensitized solar cells (DSSCs) with the hybrid CEs was achieved, which is close to that of the cell with Pt (8.86%) CE, and is a 41.12% increase compared with that of CoS CE cell with the structure of photoanode/N719/electrolyte (I − /I 3 − )/CE. Moreover, stability of the cells with the composite CEs was greatly improved. The results demonstrate that the as-prepared composites are promising alternatives to Pt-CEs for high-performance DSSCs. The reported preparation method will guide further developments in highly efficient carbon-based catalysts for electrochemistry and energy related applications.
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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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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Sha Wang,Zhenxia Zhao,Hui Xu,Yuanfu Deng,Zhong Li,Guohua Chen
A novel porous N-doped carbon microsphere (polymer-dopamine derived carbon, PDA-C) with high specific surface area was synthesized as sulfur host for high performance of lithium-sulfur batteries. We used KOH to adjust the pore size and surface area of the PDA-C materials, and then impregnated sulfur into the PDA-C samples by vapor-melting diffusion method. Effects of pore size of the PDA-C samples on the electrochemical performance of the PDA-C@sulfur cathodes were systematically investigated. Raman spectra indicated an enhanced trend of the degree of graphitization of the PDA-C samples with increasing calcination temperature. The surface area of the PDA-C samples increases with amount of the KOH in the pore-creating process. The graphitized porous N-doped carbon provides the high electronic conductive network. Meanwhile, the PDA-C with high surface area and uniform micropores ensures a high interaction toward sulfur as well as the high dispersion of nanoscale sulfur layer on it. The microporous PDA-C@S cathode material exhibits the excellent high rate discharge capability (636 mA h g −1 at 2.0 C) and good low/high-rate cycling stability (893 mA h g −1 (0.5 C) and 608 mA h g −1 (2.0 C) over 100 and 300 cycles). Cyclic voltammogram curves and electrochemical impedance plots show that both the impedance and polarization of the cells increase with decreasing pore size.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Xiaorong Fang,Pu Cheng,Kai Sun,Yujun Fu,Dequan Liu,Deyan He
Lithium–sulfur (Li–S) batteries have aroused extensive attention owing to the high theoretical capacity and energy density; however, their practical applications are impeded by the insulation of sulfur and lithium sulfides and the shuttle effect of lithium polysulfides (LiPSs). Here, zinc–nitrogen codoped carbon (ZnNC) nanofibers with pea-shaped voids were fabricated as an interlayer of Li–S batteries. It was found that the ZnNC nanofibers can anchor LiPSs and catalyze their redox conversion effectively. The cross-linked ZnNC nanofiber interlayer acting as an upper current collector can enhance the electron transfer and accelerate the lithium ion diffusion. The combined effects of the addition of the ZnNC nanofiber interlayer endow the Li–S batteries with high capacity, high-rate performance, and long cycle stability. The initial capacity is 1198.5 mAh g–1 at 0.5 C for the cell with a sulfur loading of about 1.0 mg cm–2. After 500 cycles at 1 C, a capacity of 694.1 mAh g–1 is retained with a low capacity fading of 0.073% per cycle. When the sulfur loading is 6.19 mg cm–2, the capacity reaches 754.8 mAh g–1 after 100 cycles at 0.2 C.
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高影响因子
MATERIALS LETTERS
·
2015
·
IF 2.489
Shanshan Ji,Ye Lian,Jie Zhang,Peixia Yang,Jinqiu Zhang,Maozhong An
Stoichiometric Cu 1.00 In 0.51 Ga 0.1 Se 2.04 (CIGS) thin films containing Cu(II), In(III), Ga(III) and Se(IV) are obtained for the first time in ionic liquid/n-propyl alcohol mixtures with controlled pulse electrodeposition parameters at 323 K. The effects of deposition current density, deposition time , frequency and duty cycle are studied in detail. The band gap of obtained CuIn x Ga 1− x Se 2 (CIGS) thin film are approximately 1.35 eV, as measured using UV–visible absorption spectra . The interplanar spacing and average Hall coefficient of the CIGS thin films are approximately 3.315 Å and 1.011×10 −1 cm 3 /C, respectively.
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Nano Energy
·
2017
·
IF 12.343
Xueping Liu,Tongle Bu,Jing Li,Jiang He,Tianhui Li,Jun Zhang,Wangnan Li,Zhiliang Ku,Yong Peng,Fuzhi Huang,Yi-Bing Cheng,Jie Zhong
Perovskite solar cell (PSC) has drawn widespread concern for its high efficiency and facile low-temperature solution fabrication, promising for the alternative low-cost photovoltaic energy. However, before commercializing, the problems regarding to the environmental stability and electrical hysteresis of PSCs still need to be tackled. We present a simple route by stacking n-type materials TiO 2 (spray pyrolysis) and SnO 2 (aqueous colloidal) for planar devices, and achieve a stable (~91% efficiency >90 days at 30%RH without encapsulation), hysteresis-free (hysteresis index 0.004) and efficient (18.03%) perovskite solar cells. Moreover, we carry out a system stability evaluation for unsealed devices under harsh conditions with intense UV illumination, heat and damp in an environmental chamber . Both TiO 2 and SnO 2 devices demonstrate inferior performance compare to the stacked samples in the accelerated stability tests. Photoluminescence , phase and electrical characterizations suggest that the performance enhancement is ascribed to the synergetic optimization from concealing the defective interface and promotion of carriers transfer and blocking. With the optimized n-type layers, a high efficiency of 14.39% is obtained for the 5 × 5 cm 2 sub-module. These results suggest that by stacking n-type layers could enable superior overall performances to common electron transport layers (ETLs) (TiO 2 , SnO 2 and etc.), providing facile routes for fabricating efficient PSCs with high stability.
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Scientific Reports
·
2015
·Vol. 5
·期 1
·12005
·
IF 5.578
Cui Yan-Li,Guo Xiao-Ning,Wang Ying-Yong,Guo Xiang-Yun
N-aryl imidazoles play an important role as structural and functional units in many natural products and biologically active compounds. Herein, we report a photocatalytic route for the C-N cross-coupling reactions over a Cu/graphene catalyst, which can effectively catalyze N-arylation of imidazole and phenylboronic acid and achieve a turnover frequency of 25.4 h −1 at 25 o C and the irradiation of visible light. The enhanced catalytic activity of the Cu/graphene under the light irradiation results from the localized surface plasmon resonance of copper nanoparticles. The Cu/graphene photocatalyst has a general applicability for photocatalytic C-N, C-O and C-S cross-coupling of arylboronic acids with imidazoles, phenols and thiophenols. This study provides a green photocatalytic route for the production of N-aryl imidazoles.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 44
·15957-15966
·
IF 4.099
Tingting Chen,Hongchao Wang,Wenbin Su,Fahad Mehmood,Teng Wang,Jinze Zhai,Xue Wang,Chunlei Wang
High figures of merit of n-type Pb1−xBixTe alloys have been achieved by rapid synthesis at low temperature. The effects of Bi dopant and microwave hydrothermal technology on microstructure and thermoelectric performance have been studied. The solid solubility limit of Bi in PbTe is between x = 0.02 and 0.03. Homogenous nanopowders of about 70 nm have been synthesized by the microwave hydrothermal method. When followed by hot pressing, sub-microscale grain sizes are also formed for Pb1−xBixTe alloys. With increase in Bi, the carrier concentration is improved within the solubility limit. This leads to low electrical resistivity and higher power factor at high temperature. A higher power factor of 8.5 μW cm−1 K−2 is obtained for x = 0.02 sample at 623 K. In addition, the introduction of Bi effectively prohibits the p–n transition and bipolar thermal conductivity of pristine PbTe. Thus, a low lattice thermal conductivity of 0.68 W m−1 K−1 is achieved at 673 K, combining scattering of alloys, grain boundaries, dislocations and defects. As a result, the highest peak figure of merit, i.e., zT = 0.62 at 673 K is achieved for Pb0.98Bi0.02Te sample, which is comparable with that of Bi-doped PbTe alloys synthesized by the conventional melting method. Thus, the right synthesis conditions of the microwave hydrothermal method can rapidly result in thermoelectric materials with comparable figures of merit.
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Materials Today Communications
·
2024
·
IF 3.7
Qian Luo,Runyu Wang,Kai Lu,Hang Liu,Guocai Yuan,Juncheng Ding,Xiaobo Lei,Ruonan Min,Qinyong Zhang,Lihong Huang
PbSe has attracted significant attention as a medium-temperature thermoelectric (TE) material due to its abundance and low cost. This study demonstrate that in the novel thermoelectric system of Al x Pb 0.9975 Sb 0.0025 Se samples ( x = 0, 0.005, 0.01, 0.02, and 0.03), the electronic conductivity of pure PbSe was enhanced by Sb doping. Introducing a small amount of Al to occupy the Pb vacancies not only increases the Hall carrier concentration in PbSe, but also resulting in an increase in Seebeck coefficient ( S ). At 873 K, the power factor ( PF ) of the sample with x = 0.02 increases to 16 μW cm −1 K −2 . In addition, the total thermal conductivity did not increase significantly, so the thermoelectric performance was effectively improved, a maximum figure of merit ( ZT ) of 1.8 is achieved at 873 K, along with a high average ZT ( ZT avg ) of approximately 1 over the temperature range of 300–873 K.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhenyuan Ji,Guanxiang Tang,Jingchuang Zhang,Xinghang Chuan,Jiali Zhong,Zixin Lin,Peng Song,Keqiang Xu,Xiaoping Shen
Exploiting advanced anode and cathode materials with distinctive architectures and multi-component participation is of great significance to boosting the energy density of asymmetric supercapacitors. Herein, ultra-fine FeOOH nanoparticles are in situ grown on the hollow N, S co-doped carbon (HNSC) spheres using a facile solvothermal strategy and subsequent calcination process. Benefiting from the attractive hollow architecture and the synergistic effect between FeOOH and HNSC, the FeOOH/HNSC composite as anode for supercapacitors delivers an optimal capacity of 588.2 C g −1 (1 A g −1 ) and remains 88.3 % of its initial value after 10,000 cycles at 15 A g −1 in 6 M KOH. Furthermore, the HNSC-supported Co 3 S 4 nanoparticles are also prepared through a one-step solvothermal strategy. The obtained Co 3 S 4 /HNSC composite as cathode achieves a capacity of 420 C g −1 (1 A g −1 ) and maintains a high retention of 95.3 % after 10,000 cycles at 15 A g −1 . The constructed asymmetric supercapacitor using FeOOH/HNSC and Co 3 S 4 /HNSC as anode and cathode appears to possess a superior energy density of 82.3 Wh kg −1 at 821.6 W kg −1 with retention of 84.9 % after 10,000 cycles at 10 A g −1 . These attainments demonstrate that constructing multi-component electrode materials with unique structures is an effective method to optimize the electrochemical characteristics of asymmetric supercapacitors.
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IONICS
·
2025
·
IF 2.6
Qiao Jun,Zhang Jiawei,Geng Weiyao,Wang Shichao,Wei Feng
Coal tar pitch (CTP) is widely used in road laying. However, how to realize its high added value is still a difficult problem to be solved. Herein, we report the simple avenue for the synthesis of N doped porous carbon (NPC Mg ) by template method derived from aromatic hydrocarbons in CTP. The NPC Mg presents big surface area of 2523.2 m 2 g −1 and hierarchical pore structures, temperate N content of 1.88 at.%. Due to the structural merits, NPC Mg electrode obtains large capacitance of 483.1 F g −1 at 0.1 A g −1 and superb cycle stability with 4.6% decay after 25,000 cycles in 6 M KOH solution. Besides, NPC Mg -based supercapacitor with neutral electrolyte also achieves high capacitance of 339 F g −1 , large energy output of 33.3 Wh kg −1 , long cycle life without decay after 15,000 cycles. Interestingly, the NPC Mg -based zinc ion hybrid capacitor presents large capacity of 287.7 F g −1 and superb energy output of 114 Wh kg −1 . This work provides a common approach to synthesize heteroatom doped carbon materials for capacitors.
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