JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 3
·034506
·
IF 4.386
Shuiyun Shen,Lin Li,Cehuang Fu,Guanghua Wei,Xiaojing Cheng,Jiewei Yin,Xiaohui Yan,Gang Wu,Junliang Zhang
A highly active Fe/N doped porous carbon electrocatalyst is constructed benefiting from the elaborate employment of benzimidazole (BIm) as nitrogen precursor. Compared with 2-methylimidazole (2-MIm), BIm can strongly capture Fe ions and strengthen the Fe–N bond, thus more Fe–N4 active sites form in the electrocatalyst with an enhanced catalytic activity towards oxygen reduction. The optimal sample exhibits a half-wave potential of 0.80 V vs RHE in acidic media.
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JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Changzeng Wu,Jianji Wang,Zhiyong Li,Jun Jing,Huiyong Wang
In this work, glycine ionic liquids tetramethylammonium glycine ([N 1111 ][Gly]), tetraethylammonium glycine ([N 2222 ][Gly]), tetra-n-butylammonium glycine ([N 4444 ][Gly]), tetra-n-butylphosphonium glycine ([P 4444 ][Gly]) and tetra-n-pentylammonium glycine ([N 5555 ][Gly]) were synthesized and used to prepare aqueous two-phase systems (ATPSs) in the presence of K 2 HPO 4 . Binodal curves of such ATPSs and partition coefficients of a series of dinitrophenylated (DNP) amino acids in these ATPSs were determined at 298.15 K to understand the effect of cationic structure of the ionic liquids on the phase-forming ability of glycine ionic liquids, relative hydrophobicity between the phases in the ionic liquids ATPSs, and polarity of the ionic liquids-rich phases. With the attempt to correlate the relative hydrophobicity of the phases in the ATPSs with their extraction capability for proteins, partition coefficients of cytochrome-c in the ATPSs were also determined. It was shown that partition coefficients of cytochrome-c were in the range from 2.83 to 20.7 under the studied pH conditions. Then, hydrophobic interactions between cytochrome-c and the ionic liquid are suggested to be the main driving force for the preferential partition of cytochrome-c in the glycine ionic liquid-rich phases of the ATPSs. Result derived from polarity of the ionic liquids-rich phases supports this mechanism.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 15
·9675-9684
·
IF 12.732
Fei Li,Yi-Lin Liu,Gui-Gen Wang,Dong Yan,Gui-Zhong Li,Hai-Xu Zhao,Hua-Yu Zhang,Hui-Ying Yang
With the increased development of wearable electronics, flexible zinc ion batteries (ZIBs) have attracted widespread attention owing to their low cost, superior safety, and simple fabrication process. Nevertheless, the limited active mass loading and low specific capacity remain challenges to be overcome. Herein, an effective in situ growth strategy is used to boost the mass loading and specific capacity of flexible ZIBs. We employed a mussel-derived polydopamine layer as an inductive catalyst to prompt the growth of flower-like δ-MnO2 on carbon cloth, which demonstrated strong adhesion to the surface, high mass loading, and excellent flexibility. In addition, the formed 3D conductive and supporting networks contribute to the realization of superior long cycle life, as well as a high specific capacity. As a result, the as-obtained flexible cathode can achieve a high initial discharge capacity of 1.3 mA h cm−2 at a current density of 1 mA cm−2 and a reversible capacity of 0.25 mA h cm−2 at 10 mA cm−2 for 10 000 cycles. Moreover, its reaction mechanism in ZIBs was analyzed via a series of ex situ characterization techniques, and the results suggest that the charge–discharge behavior is determined based on the Zn2+ (de-)intercalation in the δ-MnO2 interlayer. Remarkably, the as-developed flexible cathode is assembled into a flexible quasi-solid-state device, which shows excellent flexibility and can easily power one LED-based device, which has significant application prospects in wearable electronics. This work provides a novel tactic for the design of flexible batteries with high active mass loading and excellent electrochemical performance via employing polydopamine as an inductive catalyst.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ran Wang,Jing Wang,Shi Chen,Chenglong Jiang,Wurigumula Bao,Yuefeng Su,Guoqiang Tan,Feng Wu
Low conductivity and structural degradation of silicon-based anodes lead to severe capacity fading, which fundamentally hinders their practical application in Li-ion batteries. Here, we report a scalable Si/SiOx@C anode architecture, which is constructed simultaneously by sintering a mixture of SiO/sucrose in argon atmosphere, followed by acid etching. The obtained structure features highly uniform Si nanocrystals embedded in silica matrices with well-controlled internal nanovoids, with all of them embraced by carbon shells. Because of the improvement of the volumetric efficiency for accommodating Si active spices and electrical properties, this hierarchical anode design enables the promising electrochemical performance, including a high initial reversible capacity (1210 mAh g–1), stable cycling performance (90% capacity retention after 100 cycles), and good rate capability (850 mAh g–1 at 2.0 A g–1 rate). More notably, the compact heterostructures derived from micro-SiO allow high active mass loading for practical applications and the facile and scalable fabrication strategy makes this electrode material potentially viable for commercialization in Li-ion batteries.
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Zhiling Guo,Shanshan Wu,Deping Xiong,Yefeng Feng,Jin Ke,Kaidan Wu,Yukun Sun,Miao He,Zuyong Feng
A novel ternary SnO 2 -Nb-C composite, which consists of SnO 2 nanoparticles and a fraction of Niobium (Nb) embedded in flake carbon, is synthesized by hydrothermal and ball milling method. To be used as an anode material for lithium-ion batteries (LIBs), the SnO 2 -Nb-C composite is smoothly doped with n-type elements owing to the various valences of Nb , which enhances the electronic conductivity of the electrode, and effectively inhibits volume changes in SnO 2 during the cycle process, thus improving the electrode’s electrochemical performance. Therefore, at 0.2 A g −1 , the capacity is 956 mAh g −1 after 100 cycles, and the rate capacity is 1130.2 mAh g −1 . Furthermore, at 1.0 A g −1 , the specific discharge capacity is 1077.0 mAh g −1 after 500 cycles. According to the characterization results, the SnO 2 -Nb-C nanocomposite can be regarded as a potential anode material for LIBs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jifei Liu,Zida Di,Yongzhi Wan,Kai Wang,Wanjun Sun,Jianfeng Dai,Weibo Zhang,Feitian Ran
Silicon (Si) has been envisaged as the most promising anode candidate for future lithium-ion batteries with high energy density and large power owing to its high theoretical capacity and abundance. However, the inherent drawbacks of Si anodes such as low electrical conductivity and volume variation seriously hinder their commercial scalable application. Here we demonstrate a magnesiothermic reduction process for converting marigold structured silica precursor into sub-micron silicon replicas. The complicated structured silica was converted into co-continuous composites of silicon, graphite and amorphous carbon layer by in-situ generation. This electrode delivers excellent rate capability with a discharge specific capacity of 631.7 mAh g −1 at 3 A g −1 and high cycling stability of 1114.9 mAh g −1 after 200 cycles at 0.1 A g −1 . Moreover, the coulombic efficiency increased rapidly from the initial 62–97.3% after only 10 cycles and 98.8% can be obtained with negligible fading after 200 cycles. Remarkably, some byproduct partially decomposed from surfactant can be in-situ derived into amorphous carbon layer deposited in the gap of wrinkled silicon spheres, which was effectively improves the complete conductive contact and the interface compatibility between active materials. This work provides a new design strategy for preparing Si-graphite anodes suitable for commercial applications.
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International Journal of Applied Ceramic Technology
·
2024
·Vol. 22
·期 1
·e14882
·
IF 1.8
Yifei Dai,Yuxuan Liao,Aoping He,Huan He,Tianquan Liang
The hot corrosion behaviors of the Sc 2 O 3 –Gd 2 O 3 –Y 2 O 3 co-doped ZrO 2 (SGYSZ) ceramics in Na 2 SO 4 + V 2 O 5 molten salts at high temperature were investigated in this work. The results show that the SGYSZ exhibits good hot corrosion resistance to the 50 wt% Na 2 SO 4 + 50 wt% V 2 O 5 molten salts at 1000°C. It is attributed to the doping of small Sc 3+ , which can decrease the M–O bonding length and increase the binding energy, and then reduce the dissolution and loss of the stabilizer as rare-earth cations Gd 3+ and Y 3+ from the SGYSZ. The significant synergistic effects of Sc 3+ , Gd 3+ , and Y 3+ are beneficial to enhance the phase stability and corrosion resistance of the zirconate ceramic due to the different ionic radius and basicity of rare-earth oxides (RE 2 O 3 ). More Gd 3+ in SGYSZ can promote the forming and coarsening of the GdVO 4 during mineralization, which can also decrease the loss of Y 3+ from the SGYSZ. The corrosion mechanism is discussed in detail.
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Scientific Reports
·
2015
·Vol. 5
·期 1
·1-6
·
IF 5.578
Xiong Xiaoqin,Luo Wei,Hu Xianluo,Chen Chaoji,Qie Long,Hou Dongfang,Huang Yunhui
A flexible membrane consisting of MoS 2 /carbon nanofibers has been fabricated by a simple electrospinning method. MoS 2 nanosheets are uniformly encapsulated in the inter-connected carbon nanofibers with diameters of ~150 nm. When evaluated as a binder-free electrode for sodium-ion batteries, the as-obtained electrode demonstrates high performances, including high reversible capacity of 381.7 mA h g −1 at 100 mA g −1 and superior rate capability (283.3, 246.5 and 186.3 mA h g −1 at 0.5, 1 and 2 A g −1 , respectively). Most importantly, the binder-free electrode made of MoS 2 and carbon nanofibers can still deliver a charge capacity of 283.9 mA h g −1 after 600 cycles at a current density of 100 m A g −1 , indicating a very promising anode for long-life SIBs.
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Feng Jiang,Wen Li,Tao Wang,Junling Yu,Junxiong Zhang,Qian Wu,Quan Zhang,Xiaojun Zhang,Qing Hu,Guo Feng,Jianmin Liu,Yun Yu
Novel pressure field assisted non-hydrolytic sol-gel method is developed for the in-situ synthesis of novel seed-pulp-structured C@ZrSiO 4 pigments. The obtained pigments, which are composed of in-situ carbon derived from leaving organic groups as core and zircon as shell, were characterized via DSC-TG, XRD , FT-IR, Raman, XPS , SEM , TEM, UV–Vis, and automatic colorimeters. It was found that the pressure field promotes the non-hydrolytic sol-gel heterogeneous polycondensation reaction and the direct transformation of reaction groups into in-situ spherical carbon. Meanwhile, the in-situ spherical carbon was enclosed by heterogeneous condensation bonds wrap and formed a dense structure. The as-prepared pigments exhibited excellent color rendering performance ( L* = 21.07, a* = 0.48, b* = 0.75) and thermal stability.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanyan Ji,Wenjing Li,Weiping Cao,Zhen Yang,Chunming Zheng,Wu Zhang
In this work, Cu-Fe bimetal-embedded carbonaceous CuFe@C materials were prepared by high-temperature pyrolysis of CuFe-MOFs precursors synthesized through a facile two-step feeding approach. Through adjusting the reaction time of each feeding step, CuFe-MOFs of uniform dispersed crystals with controlled sizes were obtained. The carbonized composites were then applied to activate persulfate (PMS) for Reactive Brilliant Red X-3B (RBRX-3B) degradation in water. The removal rate of RBRX-3B was up to 98% in 40 min in the CuFe@C 600 /PMS system, indicating that the CuFe@C 600 catalyst showed excellent sulfate radical-based oxidation (SR-AO) activity in the degradation process. The effects of PMS dosage, initial pH, RBRX-3B concentration on the degradation efficiency were investigated in detail. Based on quenching experiments, a possible mechanism for the CuFe@C 600 /PMS system was proposed. The catalyst had good reusability, in which the removal rate of RBRX-3B could attain 82% after 5 times of repeated recycling. It also showed satisfactory removal effect on other organic pollutants, i.e. Congo red, Methyl orange, Reactive blue and p-nitrophenol. This study provided a valuable strategy for the treatment of wastewater containing organic pollutants using MOFs-derived materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Shuimiao Xia,Yinguo Li,Linwei Zhu,Qingyang Tang,Zelong Chang,Zengliang Ren,Davoud Dastan,Zhicheng Shi
Polymer films are promising dielectric materials for energy storage capacitors due to their light weight and flexibility. However, the adverse coupling between the permittivity and the breakdown strength presents a significant challenge for the enhancement of energy storage, especially at high temperatures. In this work, the Au@AO@Au@BT metal/ceramic composite nanofibers are prepared, in which barium titanate (BT) ceramic is used as the core to improve the permittivity and heat resistance of the nanocomposites. Aluminum oxide (AO) provides excellent interfacial compatibility, and the breakdown strength of the nanocomposite is enhanced by gold nanoparticles (Au NPs) with Coulomb blockade effect. This strategy achieves the compatibility of high permittivity and breakdown strength and improves the energy storage performance. As a result, the nanocomposites containing 0.3 wt% nanofibers achieve an ultra-high energy density of 8.64 J/cm 3 at 200 °C with an efficiency > 80 %, which is improved by 256 % compared to pure PEI (2.43 J/cm 3 ).
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Wei Wen,Chunying Wang,Xudong Chen,Jingyi Wang,Yaobin Li,Fei Wang,Wenpo Shan,Ping Ning,Kai Li
Two-dimensional materials have garnered significant attention in the field of catalysis due to their high electron transfer efficiency. In this study, a quasi-two-dimensional carbon–nitrogen doped cobalt-based catalyst (Co-N-C (F)) was synthesized for the investigation of formaldehyde (HCHO) oxidation at room temperature. The electronic coordination structure of the catalyst was modified by varying the calcination temperature, resulting in the formation of Co-N 4 sites that enhance the degradation of the intermediate formate. Additionally, the quasi-2D structure formed during high-temperature pyrolysis retains characteristics of the ZIF 3D material, with a high specific surface area and a porous aggregation structure, which further enhances the exposure of active centers and diffusion of the feed gas. Characterization results showed that the number of Co-N 4 sites on the catalysts increases with the rise in pyrolysis temperature, with the Co-N-C (F)-1000 catalyst exhibiting the highest concentration of Co-N 4 sites. Activity test results indicated that the Co-N-C (F)-1000 catalyst achieved a 100 % HCHO removal rate at 25 °C, with WHSV 200,000 mL/(g·h). In contrast, the activity of the Co-N-C (F)-1100 catalyst decreased, which could be attributed to the aggregation of Co particles at excessively high temperatures. The HCHO oxidation mechanism of the Co-N-C (F) catalysts was investigated using in situ diffuse reflectance infrared spectroscopy ( in situ DRIFTS), and the reaction was found to follow the sequence HCHO → HCOO − → CO 2 + H 2 O, with formate degradation as a rate-limiting step.
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