Energy Storage Materials
·
2020
·
IF 16.28
Songtao Guo,Heng Li,Yue Lu,Zhifang Liu,Xianluo Hu
The high theoretical capacity of Sb-based intermetallic alloys makes them attractive potential anode materials for sodium-ion batteries (SIBs) with high energy density . However, their cycling stability is greatly restricted by the huge volumetric variations resulted from the intrinsic (de-)alloying mechanism. Herein, we demonstrate a unique lattice softening mechanism, which enables highly reversible sodium storage and stable cycling of the as-prepared Bi–Sb alloy/carbon nanofibers electrodes. Theoretical analyses show that the elastic modulus of Bi–Sb alloys is reduced whereas the toughness is enhanced by tuning the lattice chemistry of rhombohedral Bi–Sb alloys, which is of great importance in relieving the concentrated stress during the continuous (de-)sodiation processes. In-situ characterization and electrochemical evaluations demonstrate that the electrodes made of BiSb 3 /C nanofibers exhibit high anti-pulverization capability upon Na-cycling and extraordinary long-life cyclability. Specifically, a highly reversible capacity of 233.2 mAh g −1 at 2 A g −1 is achieved over 2500 cycles. Moreover, a full cell assembled with the pre-sodiated BiSb 3 /C anode and a Na 3 V 2 (PO 4 ) 3 /C cathode delivers a high reversible capacity of 333.2 mAh g −1 at 0.2 A g −1 over 200 cycles. This present work provides further understandings and new solution for developing high-performance alloying-based anodes for SIBs.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Junying Yin,Xin Xu,Sen Jiang,Yue Lei,Yunfang Gao
Solid-state lithium metal batteries (SSLMBs) with high safety and high energy densities draw widespread attention in recent years. Nevertheless, the intrinsic defects of the solid-state electrolyte (SSE) such as the poor compatibility with electrodes and low ionic conductivity hamper the application of SSMLBs. Herein, we introduce rigid two-dimensional hexagonal boron nitride (BN) nanosheets and flexible One-dimensional aramid nanofibers (ANFs) as bi-nanofillers into the polyethylene oxide (PEO)-based SSEs to fabricate a composite solid-state electrolyte (CSE) ANF-PEO-BN with network structure boosting the comprehensive performance of SSMLBs. ANF and BN with special properties and structures are prone to be dispersed homogeneously in the PEO matrix to build the ANF-PEO-BN electrolyte, whose rigid and flexible network structure ensures the formation of Li dendrites inhibited. Furthermore, the dissociation of lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) is promoted and more ion transport channels are provided due to the strong affinity between Lewis acid centers of ANF/BN and Li + /TFSI − . As a result, the LiFePO 4 /Li batteries deliver high-capacity retention of 86% after 500 cycles and Li/Li cells stably cycle beyond 3300 h with small overpotential of 10 mV at 0.1 mA cm −2 /0.2 mAh cm −2 .
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52224
·
IF 3.057
Chuangchuang Sun,Wei Zhang,Yihua Cui,Dongyue Liu
A phosphazene-triazine bi-base sulfonate compound (CPNS) was synthesized using hexachlorocyclotriphosphazene, cyanuric chloride, and sodium p-hydroxybenzene sulfonate as raw materials. The chemical structure was determined by FTIR, 1 H NMR 31 P NMR (NMR stands for nuclear magnetic resonance), and elemental analysis of P, Na. To study the flame retardant properties of CPNS, a series of modified polycarbonate (MPC) with different ratios of CPNS were prepared. The flame retardant performance and thermal stability of CPNS/MPC were characterized by limiting oxygen index (LOI), UL-94 vertical burning test, cone calorimetry test, and TG. Results show that when CPNS is added to 0.3%, the CPNS/MPC can pass the UL94 V-0 level with an LOI value of 35.3% and reduce the peak heat release rate by 16.89% during the combustion. TG results show that adding 0.1% CPNS can decrease the initial decomposition temperature of the MPC by 68°C in nitrogen and 27°C in air. The reduction of the initial decomposition temperature means that the flame retardant promotes the isomerization reaction of polycarbonate accelerates the formation of an intermediate char on the surface. Investigation of intermediate char residue's morphology and chemical structure demonstrates that CPNS promotes the formation of more complete and compact char residue, which acts not only there is increased opportunity for radical recombination reactions in the condensed phase but also as physical barriers to inhibit the transfer of heat and oxygen, resulting in good flame retardant properties.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 41
·28531-28540
·
IF 10.7
Wenfeng Liu,Zhiyuan Li,Hongbo Liu,Yihan Zhou,Jiakai Zeng,Yi Zhao,Lu Cheng,Yao Zhou,Shengtao Li
The enhancement of the energy storage property of capacitor films at elevated temperature has been considered a critical area of research owing to the essential requirements of capacitor applications. In the present study, a ternary composite system with an improved energy storage property is reported. The ternary composite was composed of PP-graft-AA chains (acrylic acid grafting) and a PP/nano-ZrO2 matrix and was biaxially oriented into a defect-free film with a thickness of 10 μm. The obtained film (BO(PP/AA/Zr)) exhibited an energy storage density of 7.9 J cm−3 at room temperature and maintained a considerably high value of 3.9 J cm−3 at 120 °C. The characterization of charge carrier transportation indicated that the effective biaxial orientation and the introduction of the polar grafted functional group and nanofillers increased the activation energy of molecular chain segment motion and deepened electron trap energy levels, which limited the transportation of charge carriers and significantly enhanced the breakdown strength and energy storage property. Moreover, the designed graft-modified chains (acrylic acid grafted) modified the compatibility between the polymer and inorganic nanofiller, thereby improving the processibility of the defect-free thin film. The results of dynamic mechanical analysis and 2D micro-infrared spectra indicated that the graft-modified chains offset the increased elastic rigidity caused by nanoparticles and facilitated the interaction between inorganic nano-ZrO2 and polymer chains. The study provides a potential solution to the challenge that nanocomposites face during the commercial production of defect-free biaxially oriented films.
研究领域:
材料科学
·
聚合物纳米复合材料
·
介电储能
·
电气工程
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DOI
高影响因子
Journal of Energy Chemistry
·
2026
·
IF 15.6
Junqing Zhang,Yachao Zeng,Gong Zhang,Jia Yu,Hui Gao,Xiaowei Du,Yangning Zhang,Tuo Wang,Peng Zhang,Jinlong Gong
Electrolysis of (bi)carbonates into valuable chemicals using renewable electricity is an attractive strategy to integrate CO 2 capture and valorization systems for reducing carbon emissions. Optimizing the proton concentration on the catalyst surface in (bi)carbonate electrolyzers can enable rapid local CO 2 release, making it a promising approach for enhancing electrocatalytic performance. This paper describes an efficient surface modification strategy using organic molecules with low p K a values to facilitate the accumulation of protons near the electrode. Operando Raman results prove that the modifier could promote pH swinging and increase the local CO 2 concentration. Consequently, when operated at a current density of 100 mA cm −2 , the acid-modified catalyst exhibited a CO Faradaic efficiency of 60%, higher than that of the base-modified catalyst, producing syngas with a CO/H 2 ratio of 0.5 at the cell voltage of 3.3 V. The proposed method offers promising new solutions for the development of commercially relevant integrated CO 2 reduction systems.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Changhong Yang,Yajie Han,Jin Qian,Panpan Lv,Xiujuan Lin,Shifeng Huang,Zhenxiang Cheng
A recent hot-spot topic for flexible and wearable devices involves high-performance nonvolatile ferroelectric memories operating under compressive or tensile mechanical deformations. This work presents the direct fabrication of a flexible (Mn,Ti)-codoped multiferroic BiFeO3 film capacitor with Pt bottom and Au top electrodes on mica substrate. The fabricated polycrystalline Bi(Fe0.93Mn0.05Ti0.02)O3 film on mica exhibits superior ferroelectric switching behavior with robust saturated polarization (Ps ∼ 93 μC/cm2) and remanent polarization (Pr ∼ 66 μC/cm2) and excellent frequency stability (1–50 kHz) and temperature resistance (25–200 °C), as well as reliable long-lifetime operation. More saliently, it can be safely bent to a small radius of curvature, as low as 2 mm, or go through repeated compressive/tensile mechanical flexing for 103 bending times at 4 mm radius without any obvious deterioration in polarization, retention time at 105 s, or fatigue resistance after 109 switching cycles. These findings demonstrate a novel route to designing flexible BiFeO3-based ferroelectric memories for information storage and data processing, with promising applications in next-generation smart electronics.
研究领域:
材料科学
·
电子器件
·
铁电学
·
柔性电子学
·
非易失性存储器
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Jialuo Li,Guojie Gao,Yu Wei,Taolue Liu,Hanwen Xu,Mingxia Guo,Xin Ding,Yan Gao
Abstract Coupling CO2 reduction with thermodynamically favorable anodic oxidation offers a promising route for lowering the energy demand of paired electrosynthesis. Herein, we report a bismuth-based paired electrosynthesis system (Bi NSs/CF || Bi/NF-20) for the simultaneous coproduction of high value formate at both electrodes via cathodic CO2 reduction (CO2RR) and anodic methanol oxidation (MOR). Crucially, these self-supported electrodes are rationally constructed through a spontaneous galvanic replacement strategy, offering a sustainable alternative to conventional energy intensive fabrication. Consequently, the integrated two-electrode electrolyzer operates stably at 3 V for 50 h, yielding a combined FE exceeding 185% and impressive production capacities of more than 400 g kWh–1. Combined in situ Raman spectroscopy and theoretical calculations reveal that the intrinsic electronic properties of the Bi NSs/CF facilitate the rate-determining step by lowering the *OCHO formation barrier, and elucidate the dynamic evolution of active sites during the MOR. This study offers a compelling strategy for designing integrated electrolyzers toward CO2 valorization with high atom economy.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Qiang Li,Dongyang Pei,Xianduo Zhang,Hong Sun
All-vanadium redox flow battery (VRFB) with high power density is urgent in energy storage area. This study investigated the impact of Ti 3 C 2 T X /Bi as catalyst on VRFB performance at high current density . The Ti 3 C 2 T X /Bi decorated electrode was prepared based on a facile dropping method. Owing to the synergistic effect between Bi and Ti 3 C 2 T X , the hydrogen evolution reaction (HER) is effectively inhibited and the electrochemical activity towards V 2+ /V 3+ redox reaction is enhanced. With the current densities ranging from 100 mA·cm −2 to 220 mA·cm −2 , VRFB equipped with Ti 3 C 2 T X /Bi modified graphite felt shows the best rate performance. Furthermore, at a current density of 200 mA·cm −2 , the battery with Bi and Ti 3 C 2 T X modified electrode shows the highest capacity retention rate of 70.3 % after 100 charge-discharge cycles and the highest energy efficiency (EE) of 80.1 %.
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 5
·1998-2007
·
IF 3.3
Li Feng,Hanping Fu,Tianxiang Zhang,Qing Zhang,Shufen Ren,Jiayun Cheng,Qingshuang Liang,Xiufeng Xiao
The surface properties of a photocatalyst play a pivotal role in maximizing the H2O2 generation efficiency of the photocatalyst system, especially in spurring the surface catalytic reactions and inhibiting the decomposition of H2O2. Herein, a series of Bi/BiOBr-X (X = 1, 2, and 3) photocatalysts co-modified with metal Bi and oxygen vacancies were obtained by a one-step solvothermal method using mannitol as a solvent and a reducing agent. Both Bi modification and the introduction of OVs have important influence on extending the light absorption range, enhancing charge carrier separation and suppressing the recombination of charge carriers as confirmed by UV-vis DRS, EIS, and PL characterization. Besides, the introduction of OVs can lead to an upward shift of CB minimum, which results in a stronger reduction ability of the photogenerated electrons, facilitating the reaction of the photogenerated electrons with molecular oxygen to produce superoxide ions. Meanwhile, the deposition of Bi nanoparticles on the surface of BiOBr nanosheets can significantly inhibit the decomposition of H2O2. Benefiting from the synergetic effect of Bi modification and the introduction of OVs, the as-prepared photocatalysts showed enhanced H2O2 production activity as high as 100.9 mM h−1 g−1. The present work not only marks a significant advancement in photocatalytic H2O2 production technology, but also provides a feasible idea and strategy for photocatalytic production of clean and renewable energy.
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高影响因子
Advanced Electronic Materials
·
2023
·Vol. 10
·期 3
·2300651
·
IF 6.2
Tianpeng Yu,Shuyi Hou,Zhenliang Liu,Yiru Wang,Jiang Yin,Xu Gao,Nannan Liu,Guoliang Yuan,Lei Wu,Yidong Xia,Zhiguo Liu
Organic field-effect transistors (OFETs) hold great promise for applications in non-volatile memories, detectors, and artificial synapses due to the good flexibility and biocompatibility. However, certain drawbacks such as high operating voltages and significant degradation in endurance characteristics have hindered their practical implementations. Herein, a novel approach is proposed to enhance the performance of OFETs by incorporating a bi-functional n-type polymer semiconductor interlayer, Poly-{[N,N'-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} (N2200), into a pentacene OFET structure. The device exhibits remarkable improvements, with reliable P/E operation cycles of over than 10 4 and a retention time of more than 10 years. On one hand, the inclusion of N2200 as an n-type semiconductor effectively reduces the height of hole-injection barrier for trapping and thus reducing the working voltage based on the electrostatic induction theory. On the other hand, n-type semiconductor N2200 serves as a native hole-consumption (or hole-trapping) dielectric, and its narrower bandgap restrains the formation of deep hole-traps, thus favoring the endurance characteristics of the OFET.
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产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2023
·Vol. 66
·期 10
·2930-2941
·
IF 4.6
Liu Sheng,Liao SiHua,Liu Dan,Zhao Rong,Zhou Teng,Yan WenYuan,Wei KeXiang,Zou HongXiang,Zhao LinChuan
Triboelectric nanogenerators (TENGs) are highly promising energy-harvesting devices that exhibit considerable potential for use in self-powered wearable electronics. Nano/microfillers and surface microstructure modification have been proposed to improve the triboelectric performance of TENGs. In this work, performance-enhanced flexible polydimethylsiloxane (PDMS) was developed through bi-material (reduced graphene oxide/fluorinated ethylene propylene, rGO/FEP) modification and filtration-membrane-patterned surface microstructure. The rGO/FEP with high charge-inducing and -trapping capabilities can be used as the dielectric-enhanced filler for improving triboelectricity. Ordered micro-dents of 5–50 µm are created on the modified PDMS surface with an increased contact area of TENG. Compared with the pure PDMS, the modified PDMS film-based TENG could deliver a substantial enhancement in power density (0.87 mW cm −2 ) by 28 times. Further, the versatility of this device is demonstrated in human activity monitoring and capacitor charging. This work provided a simple, high-tunability, and scalable approach for improving the output performance of TENGs for biomechanical energy-harvesting devices that can be integrated into self-powering wearable electronics.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiahao Chen,Miao He,Anjun Hu,Mengjiao Liu,Chuan Zhao,Bo Zhou,Runjing Li,Zhongfu Yan,Yu Pan,Yining Fan,Jing Liu,Liujun Cao,Jianping Long
Rechargeable aqueous zinc-ion hybrid supercapacitors (ZHSs) are drawing extensive attention because of their cost-effectiveness and diminished safety hazards. Nevertheless, large-scale application of ZHSs has been hindered by the severe side reactions and rampant dendrites growth on the surface of Zn metal anodes. Herein, we propose a three-dimensional organic–inorganic composite frame material as an artificial bi-functional layer coated on the zinc foil, featuring nitrogenous functional groups with zincophilicity (abbreviated as NCFM@Zn). The nitrogen (N) site's strong adsorption capacity and synergistic effect of the sub-nanopore size promote rapid desolvation of zinc ions and reduce side reactions, while also prolonging galvanized nucleation's Sand's time and allowing for even nucleation. Moreover, the uniform distribution of N on the layer results in homogeneous zinc ions flux and supports consistent zinc plating while inhibiting dendrites generation. As a result of this unique artificial bi-functional layer, symmetric Zn cells can survive 2500 h at 2.5 mA cm −2 . High-areal-capacity zinc||activated carbon hybrid supercapacitors also demonstrate 20,000 cycles at high Coulombic efficiency, thus highlighting the utter convenience and potential of this strategy for modifying rechargeable metal hybrid supercapacitor surfaces.
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DOI
PubMed
高影响因子
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