Nano Energy
·
2021
·
IF 17.881
Yuanzheng Zhang,Xiangyang Gao,Yunchen Zhang,Jinzheng Gui,Chengliang Sun,Haiwu Zheng,Shishang Guo
Self-charging power systems (SCPSs) that combine energy harvest/store technologies have attracted extensive attention owing to their vast potential in the Internet of things (IoT). Still, the long charging time is a severe obstacle to the practical use of SCPSs. Herein, we have successfully prepared a high-efficiency SCPS composed of a performance-enhanced rotational hybrid nanogenerator (R-HNG) and high-energy-density asymmetric supercapacitor (ASC). The R-HNG consists of a rotational triboelectric nanogenerator (R-TENG) and an electromagnetic generator (EMG), exhibiting superior charging performance. Among them, the output characteristics of the R-TENG can be enhanced by adjusting the work function difference between the friction layer and electrode. The working principle of the R-HNG is systematically explained by both Kelvin probe force microscope (KPFM) and finite element simulation. Meanwhile, the as-prepared ASC based on honeycomb-like NiCo-layered double hydroxides (LDH) nanosheets are used as an energy storing device within SCPS. The SCPS can reach 5.9 V after 120 s under a rotation speed of 200 rpm, which can power a homemade positioning device for outdoor search and rescue. This work provides a novel and effective solution for constructing high-performance SCPSs and is expected to accelerate the development of SCPSs in the IoT.
研究领域:
物联网
·
能源技术
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2016
·
IF 2.322
Xin Ding,Linlin Zhang,Yan Gao
Dye-sensitized photoelectrochemical cell (DS-PEC) is an especially attractive method to generate hydrogen via visible light driven water splitting. Electrolyte, an essential component of DS-PEC, plays a great role in determining the photoactivities of devices for water splitting. When using phosphate buffer (pH = 6.4) as electrolyte, the DS-PEC displayed much higher photoactivity than using 0.1 M Na 2 SO 4 (pH = 6.4) as electrolyte. The insight is phosphate anion gathers together to form a negative electrostatic field on TiO 2 surface, which increases the resistance in the TiO 2 /catalyst and electrolyte interface and validly reduces the charge recombination from TiO 2 to the oxidized catalyst.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nature Energy
·
2025
·
IF 60.1
Zhao Chang-Xin,Li Zheng,Chen Bin,Chen Fu,Wang Chunsheng
Fast charging of high-energy batteries is critical for transportation electrification but remains challenging because the rapid rise in cell overpotential easily exceeds electrolytes’ fixed electrochemical stability window. Here we design a self-adaptive electrolyte with a dynamically expanding electrochemical stability window that increases in real time during charging, outpacing the rise in overpotential as the charging current intensifies. The self-adaptive electrolyte is a single-phase solution of salt and complementary oxidation- and reduction-resistant solvents at the cloud point composition but can undergo solvent separation to dynamically redistribute solvent components during charging. The oxidation-resistant solvents concentrate at the positive electrode and reduction-resistant solvents accumulate at the negative electrode, broadening the electrolyte stability window in real time during charging. Proof-of-concept experiments validate the versatility of this design in both aqueous zinc-metal and non-aqueous lithium-metal batteries, achieving high Coulombic efficiencies of negative electrodes and enhanced oxidative stability for positive electrodes.
研究领域:
储能技术
·
电化学
·
电池技术
·
材料科学
·
交通电气化
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Zhao Ruirui,Wang Haifeng,Du Haoran,Yang Ying,Gao Zhonghui,Qie Long,Huang Yunhui
Aqueous zinc batteries are appealing devices for cost-effective and environmentally sustainable energy storage. However, the zinc metal deposition at the anode strongly influences the battery cycle life and performance. To circumvent this issue, here we propose the use of lanthanum nitrate (La(NO 3 ) 3 ) as supporting salt for aqueous zinc sulfate (ZnSO 4 ) electrolyte solutions. Via physicochemical and electrochemical characterizations, we demonstrate that this peculiar electrolyte formulation weakens the electric double layer repulsive force, thus, favouring dense metallic zinc deposits and regulating the charge distribution at the zinc metal|electrolyte interface. When tested in Zn||VS 2 full coin cell configuration (with cathode mass loading of 16 mg cm −2 ), the electrolyte solution containing the lanthanum ions enables almost 1000 cycles at 1 A g −1 (after 5 activation cycles at 0.05 A g −1 ) with a stable discharge capacity of about 90 mAh g −1 and an average cell discharge voltage of ∼ 0.54 V.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·120548
·
IF 4.316
Mingwei Shi,Zailei Zhang,Man Zhao,Xianmao Lu,Zhong Lin Wang
For supercapacitors, high self-discharge rate is an inevitable issue that causes fast decay of cell voltage and loss of stored energy. Designing supercapacitors with suppressed self-discharge for long-term energy storage has been a challenge. In this work, we demonstrate that substantially reduced self-discharge rate can be achieved by using highly concentrated electrolytes. Specifically, when supercapacitors with 14 M LiCl electrolyte are charged to 0.80 V, the open circuit voltage (OCV) drops to 0.65 V in 24 h. In stark contrast, when the electrolyte concentration is reduced to 1 M, the OCV drops from 0.80 to 0.65 V within only 0.3 h, which was 80 times faster than that with 14 M LiCl. Decreased OCV decay rate at high electrolyte concentration is also confirmed for supercapacitors with different electrolytes (e.g., LiNO3) or at higher charging voltages (1.60 V). The slow self-discharge in highly concentrated electrolyte can be largely attributed to impeded electron transfer between the electrodes and electrolyte due to the formation of hydration clusters and reduced amount of free water molecules, thereby faradaic reactions that cause fast self-discharge are reduced. Our study not only supports the newly revised model about the formation of electric double layer with the inclusion of electron transfer, but also points a direction for substantially reducing the self-discharge rate of supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 17
·4780
·
IF 3.623
Yushu Li,Yao Zhou,Sang Cheng,Jun Hu,Jinliang He,Qi Li
The development of high-energy-density electrostatic capacitors is critical to addressing the growing electricity need. Currently, the widely studied dielectric materials are polymer nanocomposites incorporated with high-dielectric-constant nanoparticles. However, the introduction of high-dielectric-constant nanoparticles can cause local electric field distortion and high leakage current, which limits the improvement in energy density. In this work, on the basis of conventional polymer nanocomposites containing high-dielectric-constant nanoparticles, oriented boron nitride nanosheets (BNNSs) are introduced as an extra filler phase. By changing the volume ratios of barium titanate (BT) and BNNSs, the dielectric property of polymer nanocomposites is adjusted, and thus the capacitive energy storage performance is optimized. Experimental results prove that the oriented BNNSs can suppress the propagation of charge carriers and decrease the conduction loss. Using poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) as the polymer matrix, the P(VDF-HFP)/BNNS/BT nanocomposite has a higher discharged energy density compared with the conventional nanocomposite with the freely dispersed BT nanoparticles.Keywords:discharged energy density;charge–discharge efficiency;electric breakdown;ferroelectric films;dielectric losses
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 3
·739-745
·
IF 2.279
Song Ming,Zhu Ding,Zhang Lei,Wang Xiaofei,Mi Rui,Liu Hao,Mei Jun,Lau Leo W. M.,Chen Yungui
Discharge/charge characteristics of Li–O 2 batteries at a test temperature of 343 K, using Super P carbon electrodes, have been explored in this paper based on ether-based electrolytes. Compared with ambient temperature, high temperature significantly influences the discharge/charge process of Li–O 2 batteries since discharging capacity increases at about 80 % and charging voltage plateau decreases from 4.2 to 3.5 V. The stability of stainless steel mesh with electrolyte at 343 K has been researched using cyclic voltammetry. This paper lays the bases for further research on Li–O 2 batteries in high-temperature areas.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 15
·e202200441
·
IF 4.782
Hui Li†,Guang Yang†,Jingzhao Chen,Mingyu Li,Yong Su,Qiushi Dai,Hongjun Ye,Baiyu Guo,Lin Geng,Tingting Yang,Jing Wang,Liqiang Zhang,Yongfu Tang,Jianyu Huang
Graphical Voltaic cell : A voltaic cell was assembled in an aberration corrected transmission electron microscope with a Cu cathode, a Zn anode and an ionic liquid-based electrolyte. The detailed electrochemical reaction mechanisms of this battery were revealed at atomic level in real time. The Voltaic Pile, invented by Italian physicist Alessandro Volta in 1799, was the first electrochemical energy storage device created by mankind. It consists of alternatively stacked copper (Cu) and zinc (Zn) metal disks separated by brine soaked cloth cardboard as the electrolyte. Although fabricated more than two centuries ago, the electrochemistry of the Voltaic Cell has not been fully understood. Understanding the microscopic working principle of the Voltaic Cell not only has historic meaning but also provides a foundation for modern battery technologies, corrosion science and other electrochemical processes. Herein an in situ microscopic observation of the electrochemical reactions in a Voltaic Cell comprised of a Cu cathode, Zn anode and an ionic liquid-based electrolyte was reported. During discharge, Zn stripping initiated from pits formation at the surface of the Zn anode, which then propagated along the longitudinal direction of the nanorod. Concurrently Cu nanoparticles were electrodeposited on the Cu cathode. Atomic scale imaging revealed the formation of zinc fluoride (ZnF 2 ) solid electrolyte interphase (SEI) layer of about 2 nm, which grew semicoherently with the Zn anode and dictates the stripping kinetics. Our studies provide not only an in-depth understanding of the electrochemistry of the Voltaic Cell, but also a generic technique for in situ studies of metal plating/stripping and corrosion at nanometer to atomic resolution.
研究领域:
材料科学
·
电化学
·
显微技术
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2024
·
IF 19.5
Zhijian Du,La Li,Guozhen Shen
Thermally chargeable supercapacitors (TCSCs) have offered exceptional energy-converting efficiency for absorbing human epidermal heat and generating and storing electrical energy, which then realize continuous power supply to electronic devices, such as sensors and wearable electronic products, in a wide range of practical significance. Here, we proposed a flexible TCSC by attaching binder-free Ti 3 C 2 T x MXene@PPy electrodes on both ends of the H 3 PO 4 @P(AM-co-AA-co-AYP K + ) hydrogel electrolyte, which exhibits a large thermal power of 35.2 mV K −1 at 50% relative humidity and maximum figure of merit of 2.1. The high performances of the fabricated devices can be attributed to the tunable electrical, thermodynamic, thermoelectric, and mechanical properties of the hydrogel electrolyte by adjusting the acid content and the proportion of zwitterionic compound AYP K + in the hydrogel, and the high photothermal conversion efficiency and electrochemical performance of the electrodes. Moreover, the stable and outstanding thermofvoltage output (∼200 mV) under different time scenarios of the TCSC makes it possible to drive a strain sensor, accomplishing the objectives of a human activity monitor.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
Device
·
2024
·
IF 0
Huping Yan,Ronghui Qi,Zhen Liu,Han Wang,Chuanshuai Dong,Li-zhi Zhang
Ambient moisture-enabled generators (MEGs) present significant potential but suffer from low efficiency. This study explored the synergistic enhancement of an electrical double layer (EDL) at the hydrogel-electrode interface in hydrogel-based MEGs, which improves directional ion movement to achieve excellent performance. Our MEGs feature asymmetric electrodes made of carbon nanotubes and a poly(acrylamide-co-acrylic acid) hydrogel as the conductive medium. The interaction between the COOH-rich hygroscopic hydrogel and the salt-doped upper electrode established a humidity gradient within the hydrogel and a strong interfacial EDL. Results indicate that the generator (1 × 1 cm 2 ) achieved an open-circuit voltage of 1.3 V, an instantaneous short-circuit current of 55.7 μA/cm 2 , and a usable power output of 2.34 μW/cm 2 . It also exhibited robust environmental adaptability, maintaining 0.8 V below 30% relative humidity (RH) and over 0.65 V between −10°C and 60°C. Unlocking the potential of EDLs significantly enhances MEG performance, broadening application prospects in distributed self-powered devices and large-scale moisture-to-energy generation.
研究领域:
材料科学
·
能源技术
·
环境工程
✓ 已验证
DOI
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yuefei Zou,Wanlin Wu,Tian Xia,Jiangqi Zhao,Qunhao Wang,Wei Zhang,Canhui Lu
To keep pace with the fast development of portable and wearable electronics, considerable public and scientific attentions have been paid to the flexible energy storage devices with characteristics of light weight, low cost and high electrochemical performance. In this work, we demonstrate a feasible strategy to fabricate novel strand-shaped electrodes from the biomass of Juncus effusus (JE), which can be easily integrated into flexible and rechargeable Zn-MnO 2 batteries with high electrochemical performance. Notably, JE has a very unique three dimensional (3D) triangular-like hollow network microstructure, which greatly favors active material loading, charge transfer and ion diffusion. The obtained aqueous battery presents an excellent specific capacity of 325 mAh g −1 at the current density of 0.3 A g −1 , as well as stunning cycling stability for up to 4000 cycles with 127.53 % retention of the initial capacity. Remarkably, when assembled with a gel electrolyte, the quasi-solid-state battery can work normally under various extreme conditions, including bending, hammering, burning, soaking and puncturing. In addition, due to the high flexibility, the electrodes can be woven in parallel into a textile to form an energy supply unit and successfully power an electronic watch, demonstrating high potential of JE in the fabrication of flexible energy storage devices.
研究领域:
材料科学
·
能源存储
·
可持续发展
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Cong Gao,Wei Sun,Weitong Zhang,Qiao Zhang,Shanyi Guang,Qianjin Chen
Open-framework crystal structured vanadates have been extensively investigated as cathode materials for aqueous zinc-ion batteries (ZIBs). However, the inherent challenges of poor electronic conductivity and structural instability compromise the rate capability and overall cycle life. Herein, we first successfully synthesized octahedral MIL-101(V) and prepared the Zn 3 (OH) 2 V 2 O 7 ·2H 2 O@C (ZVOH@C) composite by in-situ electrochemical conversion of MIL-101(V)-derived crystalline V 2 O 3 and carbon composite (V 2 O 3 @C). The ZVOH@C composite of open-framework crystal structured Zn 3 (OH) 2 V 2 O 7 ·2H 2 O and conductive carbon skeleton not only possesses more active sites, more stable crystal structure and higher electrical conductivity , but also provides faster Zn 2+ diffusion kinetics. As expected, the ZVOH@C composite electrode exhibits excellent capacity of 506.3 mAh/g at a current density of 1.0 A/g, exceptional rate performance (375.7 mAh/g at 20.0 A/g), and impressive long-term cycling stability, maintaining 314.5 mAh/g over 5000 cycles at 20.0 A/g. This study demonstrates a promising method for designing new cathode materials through in-situ electrochemical synthesis for ZIBs .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）