ELECTROCHIMICA ACTA
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2018
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IF 5.116
Jianbo Jiang,Beibei Liu,Guiyu Liu,Dong Qian,Chunming Yang,Junhua Li
In this work, highly soluble LiNO 3 was adopted as the neutrally aqueous electrolyte for active carbon (AC)-based electrochemical double-layer capacitors (EDLCs), of which the electrochemical performances were evaluated. Simultaneously, the physicochemical properties such as the ionic conductivity and viscosity of the LiNO 3 aqueous solution were investigated. As compared with the most studied Li 2 SO 4 aqueous solution, the LiNO 3 aqueous solution displays more favorable physicochemical properties and electrochemical performances as the neutral electrolytes for EDLCs. To be specific, the conductivity of the 5.0 M LiNO 3 aqueous solution can reach up to 154.8 mS cm −1 at 25 °C, which is nearly two times of the maximum conductivity of 77.6 mS cm −1 for the 2.0 M Li 2 SO 4 aqueous solution under the identical testing conditions. Even at a concentration as high as 9.0 M, the absolute viscosity of the LiNO 3 aqueous solution is only 2.4, while that of the Li 2 SO 4 aqueous solution achieves 3.0 at the maximum concentration of 2.5 M. Additionally, 5.0 M LiNO 3 aqueous solution exhibits a wide electrochemical potential stability window from −0.9 to 0.9 V (vs. SCE) at the AC electrode, giving rise to an operating cell voltage of 1.8 V, which is comparable to that of 2.0 M Li 2 SO 4 aqueous solution. Further, with the 5.0 M LiNO 3 aqueous solution as the electrolyte, the as-fabricated EDLC delivers an energy density up to 21.16 Wh Kg −1 at a power density of 100.09 W kg −1 , which is higher than 18.43 Wh Kg −1 for the EDLC with the 2.0 M Li 2 SO 4 aqueous electrolyte at the identical power density. Even though the power density reaches as high as 5970 W kg −1 , the energy density of the EDLC with the 5.0 M LiNO 3 aqueous electrolyte can still remain at 13.1 Wh Kg −1 , substantially higher than 8.71 Wh Kg −1 of the EDLC with the 2.0 M Li 2 SO 4 aqueous electrolyte at the same power density. Moreover, the EDLC with the 5.0 M LiNO 3 aqueous electrolyte also holds good cyclic stability. After 10000 charge–discharge cycles at a current density of 1 A g −1 and a cut-off voltage of 1.8 V, the capacity retention of this EDLC retains more than 90%. These results can render an insight to explore safe, eco-friendly, inexpensive and neutrally aqueous electrolytes for supercapacitors .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 18
·2111662
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IF 19.924
Huaifang Qin,Liang Xu,Shiquan Lin,Fei Zhan,Kai Dong,Kai Han,Huamei Wang,Yawei Feng,Zhong Lin Wang
As an emerging technology for energy harvesting and distributed power supply, triboelectric nanogenerators are mainly based on a dielectric capacitive structure. Here, a new mechanism by introducing an oil phase into a water–solid interface is demonstrated for energy harvesting based on electric double layer (EDL) capacitance. Through squeezing and releasing oil droplets on a dielectric surface in water environment, charge transfer is observed in the back electrode accompanying the movement of the oil–water–solid three-phase line. The charge transfer is mainly attributed to the effect that the oil phase sweeps away ions near the dielectric surface in the EDL due to the discrepancy of EDL between water–solid and oil–solid interfaces. Under the water environment, the device is shown to be capable of direct energy harvesting and self-powered sensing without costly packaging. As a new working mode relying on EDL, it allows developing nanogenerators adaptive to severe environments even underwater with low friction and wear, and narrowing the gap between energy harvesting devices and electro-chemical devices. Through further enhanced EDL, it is reasonable to anticipate devices with an ultrahigh charge density comparable with EDL super capacitors, opening up an avenue toward new nanogenerators with overwhelming performance for practical applications ranging from blue energy harvesting to electro-catalysis.
研究领域:
纳米技术
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能量收集
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电化学
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传感器与传感系统
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可再生能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Wei Shao,Zitong Wu,Yi Liu,Guoan Tai
As an exceptional metallic Dirac material, borophene shows promise for superior mechanical and electronic properties, making it increasingly significant in electronics. Both theoretical predictions and experimental evidence underscore its potential in energy storage applications. However, due to existing limitations in synthesis techniques, the application of stacked borophene as flexible electrodes remains unexplored. This study aims to overcome these challenges by introducing an innovative in situ co-eutectic salt method for synthesizing AB-stacked hydrogenated borophene sheets. These sheets are then employed to fabricate large-scale electrodes and construct flexible electric double-layer supercapacitors based on borophene. The robust mechanical stability of stacked borophene facilitates significant improvements in interfacial characteristics and energy storage performance through rolling processes. This enhancement results in increased specific capacity, improved rate performance, and enhanced cyclic stability of thin-film electrodes. Specifically, the optimized borophene-based supercapacitor achieves a high specific areal capacitance of up to 417.3 mF/cm 2 in an organic electrolyte at a current density of 1 mA/cm 2 , which represents a twofold improvement compared to non-stacked borophene structures. Remarkably, it retains over 88.3 % of this specific areal capacitance even at a high current density of 15 mA/cm 2 , demonstrating impressive rate capability. Furthermore, after 5000 charge–discharge cycles, the capacitance retention exceeds 89.3 %. This research is expected to catalyse the application and advancement of borophene in future flexible and portable electronic devices, highlighting its potential transformative impact in energy storage technologies.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
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2023
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IF 3.9
Tao Wu,Yujie Hong,Dongchen Shao,Jiatong Zhao,Zhengye Feng
The impact of the diffuse double-layer on the diffusion of radionuclide anions remains unclear, impeding the application of Archie's law for adsorptive anions. Through-diffusion experiments were carried out to measure the effective diffusion coefficient and distribution coefficient of Ce(III) in the presence of EDTA. A multi-porosity model, in combination with Archie's law, was used to estimate the effective diffusion coefficient. The predominant species, CeEDTA − , exhibited an effective diffusion coefficient of (0.88–1.92) × 10 −11 m 2 /s and the distribution coefficient of (0.81–1.18) × 10 −3 m 3 /kg at the compacted dry density of 1300–1800 kg/m 3 . The accessible porosity, the diffuse double-layer porosity, and the interlayer porosity were analyzed using the multi-porosity model, based on the characterization of bentonite via Scanning electron microscopy with energy dispersive spectrometry, X-ray diffractometer , and Nitrogen-Brunner-Emmett-Teller method. Due to the low external surface area of Zhisin bentonite (27.7–35.3 m 2 /g), the impact of the diffuse double-layer was insignificant on the total and accessible porosities. Additionally, the diffuse double-layer porosity had insignificant impact on the effective diffusion coefficient of CeEDTA − in compacted bentonite, as its value was one order magnitude lower than that of the interlayer porosity and the accessible porosity.
研究领域:
环境科学
·
放射生物学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Shiyu Zuo,Yan Wang,Jinquan Wan,Jianxin Yi
A fundamental scientific quandary in environmental has always been the pH dependence in Fenton reaction, that is, the reaction kinetics decreases by approximately 1–3 orders of magnitude upon transitioning from an acidic to an alkaline state. Here, we discovered that protons significantly contribute to the Fenton reaction through an examination of the reaction's interfacial behavior characteristics. Proton transfer mediated by hydrogen bond network connectivity in the electric double layer is responsible for the pH dependence of Fenton reaction kinetics. On this basis, the surface potential of Fenton reaction catalyst was modified to optimize the distribution of H 2 O in the electrical double layer, enhancing the connectivity of the interfacial hydrogen bond network and providing a fast channel for rapid proton transfer. The consecutive hydrogen bond network mediates rapid proton hopping, increasing the proton concentration in the Helmholtz layer, and consequently promoting the proton conductivity from 5.38×10 −7 S·cm −2 to 4.35×10 −6 S·cm −2 in alkaline conditions for Fenton reaction. Meanwhile, the kinetics reaction rate was improved 20 times, and the pH dependence was reduced from 70.9 % to 12.6 %. This discovery clarifies the key role of the interfacial hydrogen bond network and proton transfer in Fenton reaction kinetics pH dependence. It provides new theories and methods for achieving alkaline high Fenton reaction kinetics.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2023
·
IF 5.9
Hu Zhang,Jingkun Hu,Yongchuan Liu,Changxin Lin,Xiangxin Zhang,Yining Zhang
Capacitive deionization (CDI) based on the theory of a double electric layer has received much attention in the past two decades as a highly promising desalination technology, and carbon nanospheres are considered promising carbon-based electrode materials for CDI, which have been investigated by a large number of researchers. However, the isolation between the spheres greatly increases the contact resistance, limiting their application in CDI. To understand the effect of structure on the performance of CDI and to obtain a better CDI performance, solid carbon spheres and monodisperse hollow carbon spheres were prepared and compared with interconnected hollow carbon spheres (IHCSs). The resulting IHCSs, with their unique cavity structure and interconnected carbon walls, exhibited superior electrochemical performance and electrosorption capacity. In addition, we improved the electrical conductivity, surface wettability, and adsorption properties of the carbon nanospheres by incorporating nitrogen doping. By adjusting the amount of nitrogen functional groups in the carbon nanosphere precursors, we produced interconnected hollow carbon nanospheres with similar structures (particle size, specific surface area, and porosity) but different nitrogen contents and investigated the effects of different nitrogen contents on the CDI properties of hollow carbon nanospheres. The results indicated that interconnected hollow carbon nanospheres with a high nitrogen content (designated as NFs-2) demonstrated the best CDI performance, achieving an electrochemical adsorption capacity of 20.43 mg g–1 in a NaCl solution with a concentration of 500 mg L–1. Additionally, NFs-2 exhibited the largest specific surface area of 728 m2 g–1. Furthermore, NFs-2 displayed excellent cycle stability in a desalination cycle using a 100 mg L–1 NaCl solution, retaining up to 97.17% of its initial desalination capacity after 25 sorption–desorption cycles. These findings highlight the promising applications of NFs-2 in CDI technology.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Qin-Hua Xu,Yaofeng Cai,Jiajie Li,Minglin Zhou,Yanbin Xu
Anaerobic digestion technology effectively recovers energy from livestock manure but discharges digestate with high ammonia nitrogen (NH 4 + -N). NH 4 + -N in digestate can be effectively recovered by electrodialysis (ED) technology. However, the implementation of ED technology is limited by membrane and energy costs. Here, we present a capacitor-circuit-switching electrodialysis (CCSE) strategy to enhance ED efficiency by integrating an electric double-layer capacitor (EDLC). We reveal that the energy storage mechanism of EDLC improves the power density while the intermittent operation mitigates the concentration polarization effect. In the practice of the real digestate, CCSE elevated the pH to 9.4, and 98.8 % of the NH 4 + ions migrated to the cathode compartment after 3.5 h. The specific energy consumption and the current efficiency are 15 kWh/kg NH 4 + -N (N) and 64.1 %, respectively. High pH contributes to carbon reduction in the stripping process, and subsequent alkaline contamination can be controlled by neutralization of the anode effluent. Moreover, the CCSE-stripping system achieved 95 % NH 4 + -N removal and 93 % stripping recovery efficiency. This work provides valuable insights and solutions for the design and optimization of ED systems.
研究领域:
环境科学
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能源技术
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Jinsong Huang,Jinwei Chen,Rengjian Yu,Yilun Zhou,Qian Yang,Enlong Li,Qizhen Chen,Huipeng Chen,Tailiang Guo
Biodegradable and environmentally friendly artificial synapse devices are essential for the future development of neuromorphic computing . The emergence of synaptic transistors based on biocompatible polymer materials provides an ideal approach to achieve green electronics. However, modulating the synaptic properties in a wide range in a fixed biocompatible synaptic transistor is still challengeable, while it is vitally important for improving the adaptability of the synaptic device to achieve neuro-prosthetics in the future. Here, we reported the regulation of the synaptic behavior of biocompatible synaptic transistor through ion-doping, which allows to adjusting the response of the synaptic device according to a specific function. The ions doped into the insulating layer strengthen the formation of electric double layers (EDLs), which enables a remarkable regulation effect on post-synaptic current. Moreover, basic synaptic properties, including excitatory/inhibitory post-synaptic current (EPCS/IPSC), paired-pulse facilitation/depression (PPF/PPD), short-term/long-term memory (STM/LTM) are successfully demonstrated. In addition, high-pass and low-pass filtering functions are also implemented in a single synaptic device, indicating that the synapse attenuation can be effectively transformed according to the needs of the function. More importantly, this is the first work to demonstrate that the accuracy of pattern recognition of synaptic transistors, an important indicator of neuromorphic calculations, can be significantly improved via ion doping (as high as 75.96% relative to undoped devices of 41.68%). Our research provides a feasible strategy for precisely controlling synaptic behaviors, which has a profound impact on improving the adaptability of artificial synaptic devices in the field of neuromorphic computing.
研究领域:
神经形态计算
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材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuan Zhang,Weiquan Zhan,Qizheng Weng,Shaoxian Song,José Luis Arauz-Lara,Feifei Jia
With increasing demands for rare earth elements (REEs) in high-tech and futuristic applications, developing efficient methods for recovering low-concentration REEs is necessary. Here, electro-assisted sorption of low-concentration REEs , La(III), Gd(III) and Y(III) (as symbol of light, medium, and heavy REEs) on carbon-based materials, activated carbon (AC), graphene, and graphite by a facile method was reported. Recovery of La(III), Gd(III) and Y(III) could reach ∼100 % under low-concentration condition where the maximum adsorption capacity was up to 342.38 mg/(g·dm 2 ). Variants including applied voltage, electrodes-distance, pH, impurities, and concentration were considered to study the effects on REEs recovery. Interestingly, adsorption capacity and recovery under low voltage were respectively almost 20 and 14 folds than that without voltage, because voltage promoted REEs transfer and strengthened electrostatic interaction between electrodes and REEs. The mechanism for enhancing REEs recovery on carbon-based electrodes was resulted from high electric double layer (EDL) capacitance and low charge transfer resistance. Total desorption of REEs from electrodes could be quickly realized using NH 4 Cl or HCl solution. Overall, the study gave a new insight of low-concentration REEs recovery using carbon-based materials, and provided an efficient route using electric method with porous materials for REEs recovery.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yue Feng,Xun Liu,Jingyi Wang,Xinyu Zou,Dianlin Wang,Lei Xie
Nanostructures have been commonly incorporated into oil-water separation membranes to improve their antifouling properties. However, the antifouling mechanism of the membrane with different nanostructures is still unclear. In this work, ZnO nanostructures, i.e., nanorods, hollow nanorods and randomly assemble nanosheets, were constructed on polyvinylidene fluoride (PVDF) membrane surfaces. The resulted membranes exhibited improved antifouling properties in comparison with the pristine PVDF membrane, and the hollow nanorods showed the best antifouling property. The antifouling mechanism was investigated through direct force measurements between oil drops and membrane surfaces using atomic force microscopy. The theoretical analysis of approach force curves indicated that the repulsive electrical double layer force was enhanced at higher pH and in the presence of ZnO nanostructures, which prevented the oil attachment on the membrane surface. The retraction force curves suggested that the adhesion between oil and membrane was significantly affected by the ZnO nanostructures, and the adhesion followed the trend of hollow nanorods < randomly assemble nanosheets < nanorods. Consequently, the oil drops on the membrane with hollow nanorods could be easily removed by water rinsing, which agreed with the flux recovery results. This work provided a fundamental understanding of the antifouling mechanism of the oil-water separation membranes with nanostructures, and a useful guidance for constructing suitable surface structures for efficient oil-water separation membranes.
研究领域:
材料科学
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环境工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Shuai Sun,Lei Wang,Han Xu
Reduced graphite oxide membrane (RGOM) with different thickness were prepared and used as electric double layer capacitor (EDLC) electrodes with aqueous electrolyte. According to quantum and molecular dynamic simulations, it was difficult for K + and OH − to diffuse into graphene sheets due to dense structure, which made the RGOM electrodes show poor EDLC behaviors. Electrochemical tests showed that controlling the thickness of electrodes and modifying the dense structure could improve the specific capacitance of EDLC. Further studies indicated that during galvanostatic charge/discharge processes, if the EDLC were heated at 70 °C for one cycle and then cooled down to room temperature, the specific capacitance could be increased further. Additionally, according to 10,000 times cycling tests at 5000 mA g −1 , the improved capacitance could be maintained for long time (154–167 F g −1 during test process), indicating that the hot activation could make RGOM electrodes obtain good and stable EDLC performances.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Baojun Wang,Rong Zheng,Weifeng Yang,Chengyi Hou,Qinghong Zhang,Kerui Li,Yaogang Li,Hongzhi Wang
To realize stable aqueous zinc metal batteries that can operate over a wide temperature range, simple introduction of organic solutes into the electrolyte is required. However, common solute additives are poorly soluble in concentrated electrolytes for low-temperature applications. Herein, a strategy of using mixed solute additives is developed based on size-complementary zincophilic molecules with electron-rich groups. In the bulk electrolyte, the high-concentration short-chain acetamide (5 mol kg–1) dominantly regulates the hydrated Zn2+ and the hydrogen-bonding network for suppressing active H2O; at the anode interface, the complementary short-chain acetamide and long-chain silk amino acids form specific-adsorption and pH-buffering layers. Furthermore, the size-complementary zincophilic molecules reconstruct the double electric layer and solid electrolyte interphase to inhibit the side reactions of the Zn anode. Consequently, the zinc metal batteries have excellent cycle life (3400 h), Coulombic efficiency (99.7%), and wide-temperature-range adaptability (−60 to 60 °C), making them attractive candidates for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）