Nano Energy
·
2025
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IF 17.1
Huanchi Chen,Yuxuan Zhang,Gang Zhao,Bingzhe Jia,Xinming Wu
Transition metal sulfides exhibit excellent energy density and specific capacitance in redox enhanced supercapacitors. However, the phenomenon of rapid self-discharge limits their large-scale development. In this study, we have analyzed an innovative and simple preparation of polydopamine (PDA) coated CoS 2 @MoS 2 @CC for redox enhanced supercapacitors applications. Considering the suppression the self-discharge of supercapacitors while also improving electrochemical performance of electrode. Subsequently, the densities of states, differential charges and adsorption energies of the PDA@CoS 2 @MoS 2 @CC and CoS 2 @MoS 2 @CC electrodes were calculated by using density functional theory (DFT) to investigate the mechanism of the effect of polydopamine on the performance of supercapacitors. PDA@CoS 2 @MoS 2 @CC electrode reveals a large specific capacitance (3520.45 mF cm −2 ) and outstanding cycling stability (92.75 % capacity maintenance after 10,000 cycles at 1 mA cm −2 ). This is because of the strong interaction between the PDA coating and K + , while K + are adsorbed in the PDA@CoS 2 @MoS 2 @CC electrode with high adsorption energy (-2.59 eV). It is convenient for the storage of K + . Therefore supercapacitors assembled with PDA@CoS 2 @MoS 2 @CC electrode also exhibit excellent performance (specific capacitance, energy density and power density are 511.85 mF cm −2 , 0.74 Wh cm −2 and 1.53 W cm −2 at 0.5 mA cm −2 ). It is important to investigate the self-discharge performance of the supercapacitor constructed by PDA@CoS 2 @MoS 2 @CC. Notably, the voltage of this device decreases to 0.73 V after 20000 s (initial potential is 1.7 V), which is better than the device assembled by CoS 2 @MoS 2 @CC (0.6 V after 20000 s). Further, the leakage current of this device is also less than the device assembled by CoS 2 @MoS 2 @CC at 1.7 V (0.05 mA vs 0.08 mA). This effective self-discharge suppression strategy is due to the free radical/singlet oxygen scavenging properties of PDA, which limits the parasitic Faraday reaction induced by diffusion-controlled, thus mitigating self-discharge.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
·
IF 23.655
Shang Wenshuo,Li Qiang,Jiang Fuyi,Huang Bingkun,Song Jisheng,Yun Shan,Liu Xuan,Kimura Hideo,Liu Jianjun,Kang Litao
Highlights
High-performance Zn||I 2 batteries were established by coating zeolite protecting layers.
The Zn 2+ -conductive layer suppresses I 3 − shuttling, Zn corrosion/dendrite growth.
The Zeolite-Zn||I 2 batteries achieve long lifespan (91.92% capacity retention after 5600 cycles), high coulombic efficiencies (99.76% in average) and large capacity (203–196 mAh g −1 at 0.2 A g −1 ) simultaneously.
Abstract The intrinsically safe Zn||I 2 battery, one of the leading candidates aiming to replace traditional Pb-acid batteries, is still seriously suffering from short shelf and cycling lifespan, due to the uncontrolled I 3 − -shuttling and dynamic parasitic reactions on Zn anodes. Considering the fact that almost all these detrimental processes terminate on the surfaces of Zn anodes, modifying Zn anodes’ surface with protecting layers should be one of the most straightforward and thorough approaches to restrain these processes. Herein, a facile zeolite-based cation-exchange protecting layer is designed to comprehensively suppress the unfavored parasitic reactions on the Zn anodes. The negatively-charged cavities in the zeolite lattice provide highly accessible migration channels for Zn 2+ , while blocking anions and electrolyte from passing through. This low-cost cation-exchange protecting layer can simultaneously suppress self-discharge, anode corrosion/passivation, and Zn dendrite growth, awarding the Zn||I 2 batteries with ultra-long cycle life (91.92% capacity retention after 5600 cycles at 2 A g −1 ), high coulombic efficiencies (99.76% in average) and large capacity (203–196 mAh g −1 at 0.2 A g −1 ). This work provides a highly affordable approach for the construction of high-performance Zn-I 2 aqueous batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Shaoming Feng,Lei Fan,Hao Zhou,Haomiao Li,Shuai Yan,Weixin Zhang,Yewei Guo,Bo Li,Kai Jiang,Kangli Wang
Liquid metal batteries (LMBs) with Na anode exhibit the advantages of low-cost, high-safety, long-lifespan, and easy scale-up, making them promising for large-scale energy storage applications. However, the high solubility of Na and its sluggish kinetics in discharge products result in severe self-discharge and low cathode utilization, significantly hindering the development of Na-based LMBs. In this study, a stable Na-Li dual cation LMB with metal Sb cathode is designed based on the in-situ displacement reaction between Na and molten salts of lithium halides electrolyte. This design effectively suppresses the self-discharge of the battery, and the multistage discharge mechanism of the dual-cation system enhances cathode utilization. Moreover, the self-healing property of the Sb cathode protects the electrode against volume expansion and degradation, enhancing cycling performance. The Na-Li| LiCl-KCl-NaCl |Sb cell was constructed and operated at 485 °C. The battery retained 97.02 % of its capacity after 800 cycles at 0.6 C, with a decay rate of 0.00373 % per cycle. Furthermore, the battery achieves a cathode material utilization of 89 % at 0.6 C. These improvements effectively promote the development and application of LMBs.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 6
·2966-2972
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IF 12.732
Mingwei Shi,Wei Yang,Zailei Zhang,Man Zhao,Zhong Lin Wang,Xianmao Lu
Solid-state supercapacitors (SSSCs) using hydrogel electrolytes have attracted great interest in recent years due to their potential for powering flexible and wearable electronics. But the application of SSSCs has been severely restricted by self-discharge, which is an inevitable issue that causes fast decay of cell voltage and loss of stored energy. In this work, we demonstrate that suppressed self-discharge of SSSCs can be achieved by using polyacrylamide (PAAm) hydrogels containing highly concentrated LiCl as electrolytes. Specifically, for cells with 14 M LiCl-PAAm hydrogel electrolytes charged to 0.8 V, a low OCV decay rate of 6.7 × 10−5 V mF−1 h−1 and a small leakage current of 0.003 μA mF−1 V−1 are obtained. Notably, the leakage current is much smaller than that of currently reported supercapacitors using hydrogel electrolytes. In addition, when SSSCs are employed for storing energy harvested by using a triboelectric nanogenerator (TENG) that has a characteristic of pulsed output current at the μA scale, a much enhanced charging efficiency is attained.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 30
·16152-16162
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IF 14.511
Xin Dai,Kunyang Zou,Weitao Jing,Peng Xu,Junjie Sun,Shengwu Guo,Qiang Tan,Yongning Liu,Tengfei Zhou,Yuanzhen Chen
The electron-deficient property of the atoms in functional materials endow them with tunable adsorption and catalysis effects on polysulfides, thus improving the performance of lithium–sulfur batteries. In this work, Li2B4O7 nanoparticles, which have abundant electron deficiencies derived from the [BO3] Lewis acid units, were uniformly cladded in the carbon nanofibers (LBO–CNF) and employed as interlayers for Li–S batteries. This functionalized interlayer expressed a high adsorption energy of ∼3.6 eV for polysulfides (e.g., Li2S6 and Li2S4) and effectively suppressed the polysulfides' shuttle behavior, delivering a high reversible capacity of 1242.6 mA h g−1 at 0.2C and good cycling performance with a low fading rate of 0.068% per cycle at 1C, thus effectually inhibiting the phenomenon of self-discharge. Besides, the lithiation reaction kinetics was also effectively enhanced, enhancing the rate performance of the battery to 644 mA h g−1 at 5C. This work provides a new strategy to enhance the electrochemical performance of Li–S batteries by applying the compounds of electronic-deficiency B-species and functionalized carbon.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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功能材料
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Jianhui Li,Zaisheng Wang
Trimethyl borate (TMB) has been identified as electrolyte additive to suppress self-discharge for high voltage layered lithium-rich oxide cathode (LRO) for lithium ion batteries in our previous work. To expand pervious findings, its derivatives, triethyl borate (TEB) and tripropyl borate (TPB) with increased alkyl chains, have been considered as electrolyte additives to mitigate self-discharge behavior of LRO cathode for lithium ion batteries and we make a contrast to explain which one is better and why is better. It is found that fully charged (4.8 V, vs. Li/Li + ) LRO cathode suffers severe self-discharged issue upon storage in standard (STD) electrolyte (1 mol L −1 LiPF 6 -EC/EMC/DEC (3:5:2, in weight)). In contrast, this detrimental self-discharge behavior of LRO cathode at high voltage can be effectively depressed by introducing TEB or TPB into the electrolyte system. Combinations of electrochemical methods and multi spectroscopy techniques have been employed to evaluate effects of TEB and TPB on the LRO cathode surface . They reveal that the B–O and B–F bonds species in the film formed by TEB and TPB prevents electrolyte decomposition and protects LRO from structure transformation. These species in the film formed by TEB is much more than TPB, which explains the better effect for TEB.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kewei Shu,Wenjuan Li,Yi Zhang,Yan Zong,Huilan Li,Yu Wang,Zixiong Sun
Flexible, miniature, and lightweight supercapacitor is ideal power source for next-generation portable and wearable electronics. However, their widespread application is limited by a critical drawback, self-discharge, which leads to energy loss during idle periods. To this end, a polyvinylidene fluoride (PVDF)-based nanofiber separator with piezoelectric properties that can effectively suppress self-discharge in supercapacitors, was prepared via electrospinning. By incorporating hydrophilic cellulose acetate (CA) and reduced graphene oxide (rGO) into the PVDF matrix, both the electrolyte affinity and piezoelectric output of the separator are significantly enhanced. The resulting rGO/CA/PVDF composite membrane exhibits outstanding mechanical flexibility, high porosity, excellent electrolyte uptake, making it highly suitable separator for flexible supercapacitor. Supercapacitors equipped with such separator exhibit superior electrochemical performance with a specific capacitance of 178.2 F/g at 10 A/g. Notably, an impressive capacitance retention of 79 % was achieved after 24 h of self-discharge test. The reduction in self-discharge is primarily due to the limited diffusion of electrolyte ions, induced by the polarized rGO/CA/PVDF composite separator endowed with improved piezoelectric characteristics. This work highlights the potential of piezoelectric separators as an effective strategy for long-term energy retention, and offers new insights into the rational design of functional separators with self-discharge mitigation capabilities.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 9
·3213-3226
·
IF 6.4
Zihong Shen,Zunxian Yang,Yuanqing Zhou,Yuliang Ye,Bingqing Ye,Qiaocan Huang,Wenbo Wu,Hongyi Hong,Zeqian Hong,Zongyi Meng,Zhiwei Zeng,Songwei Ye,Zhiming Cheng,Qianting Lan,Jiaxiang Wang,Ye Chen,Hui Zhang,Tailiang Guo,Yun Ye,Zhenzhen Weng,Yongyi Chen
Artificial photonic synapses, owing to their high sensitivity, low power consumption, and integration of sensing and memory, have aroused comprehensive discussion and have been developed into devices used as the new sensors for the Internet of Things (IoT) and artificial neural networks (ANNs). Colossal energy consumption may be one of the factors hindering the development of neuromorphic computing. Herein, ternary component organic array films of TIPS-pentacene, polystyrene, and CsPbBr3 perovskite quantum dots (QDs) are effectively developed to fabricate photonic synaptic transistors. The patterned organic thin films prepared by the solution processes can be distinctly controlled in the crystallographic orientation using a pre-patterned-guided crystallizing strategy and the corresponding transistor of TIPS-pentacene with mobility over 1 cm2 V−1 s−1 is successfully achieved. On this basis, the ternary composite film exhibits synaptic behaviours from short-term plasticity (STP) to long-term plasticity (LTP), including paired-pulse facilitation (PPF), spike-time-dependent plasticity (STDP), spike-number-dependent plasticity (SNDP), spike-frequency dependent plasticity (SFDP) and light-potentiation/electric-depression. Benefiting from the improved material compatibility and film-forming properties of small molecule semiconductors and perovskite QDs with polymer polystyrene, our synapses still exhibit prominent synaptic features at a low power consumption of 0.036 fJ. Utilizing time-dependent plasticity, the synaptic device stimulated by a series of light signals realizes wireless optical communication. In addition, the pattern recognition function by ANNs is verified. This work provides a feasible fabricating path to patterned array film-based photonic synapses for the next generation human–computer interaction sensors.
研究领域:
材料科学
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类脑计算
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光电技术
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人工智能
✓ 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）