NANOTECHNOLOGY
·
2024
·Vol. 35
·期 34
·345402
·
IF 2.9
Ruixue Liu,Sainan Wei,Bao Shi,Yizhi Ma,Luning Sun,Wei Wang
The continuous advancements in wearable electronics have drawn significant attention toward 2D MXenes materials for energy storage owing to their abundant availability, adaptability, and distinctive physicochemical properties. Two unresolved concerns currently revolve around environmental pollution by F-containing etching and finite kinetics caused because of re-stacking of nanosheets. In this study, Al was electrochemically etched from porous Ti2AlC electrodes without the use of fluorine, through a selective electrochemical etching process in dilute hydrochloric acid. Subsequently, Ti2CTx MXene was vertically grown on carbon fiber (CF) substrates. The resulting Ti2CTx@CF electrodes are lightweight, thin, and flexible, exhibiting a surface capacitance of 330 mF cm−2 at a constant current density of 1 mA cm−2 after 2000 cycles. They display a surface capacitance retention of 96.16% and a high energy density of 45.3 μWh cm−2 at a power density of 0.497 mW cm−2. These metrics underscore the Ti2CTx@CF electrode's commendable multifunctionality, electrochemical performance, ion transport efficiency, and charge storage capacity. Moreover, a flexible energy storage electrode material with a high area capacity was developed by combining Ti2CTx MXene nanosheets, possessing a large specific surface area, with a flexible carbon fabric substrate.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yong Liu,Xudong Liu,Shangli Dong,Xuefeng Zhang,Yidan Wei,Lu Lv,Sirui He
The closely restacked MXene nanosheets obstruct electrolyte ion transfer in electrodes, limmiting the electrochemical performance at a high charging-discharging rate. Although various 3D porous structures have been constructed, size effect of porous MXenes electrodes has been rarely studied. Herein, the classical metal ion-assisted method was used to fabricate 3D porous MXene films. The pore size distribution was changed by adjusting the cation valency. Noteworthy, when the mesoporous pore size distribution is in the range of 5 ∼ 10 nm, the porous structure can significantly improve the electrochemical performance and the presence of micropores can increase the proportion of surface capacitance. As a result, the porous Ti 3 C 2 T x film treated by Mg 2+ showed outstanding electrochemical performance, with both high capacity (420F/g at 2 mV/s) and good cyclic stability (94.4% retention after 5000 cycles). This work presents a study on how pore size distribution of porous MXene film effects the electrochemical performance and provides a reference for the design of 3D porous MXene electrodes.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Liying Liu,Xuehang Wang,Vladimir Izotov,Dmytro Havrykov,Illia Koltsov,Wei Han,Yulia Zozulya,Olga Linyucheva,Veronika Zahorodna,Oleksiy Gogotsi,Yury Gogotsi
Increasing the mass loading of active material in a supercapacitor electrode improves the energy storage capability per electrode area. However, the increase of mass loading is accompanied by the increased electrode thickness, which often causes drops in specific capacitance and counteracts the potential increase in areal capacitance once the electrode thickness exceeds 100 μm. In our previous work, we showed high specific capacitance retention of coarse-grained carbide derived carbon (CDC) with electrode thicknesses up to 1000 μm in organic electrolytes. In this work, we report that this behavior can be extended to coarse-grained activated carbon (AC). AC is the most common commercial supercapacitor electrode material with a much broader pore size distribution and lower electric conductivity compared to CDC. The areal capacitance of the AC electrode is enhanced from 2.3 F/cm 2 to 7.4 F/cm 2 at 5 mV/s, as the electrode thickness increases from 200 to 800 μm. With the increased mass loading of the active electrode material, the mass and volume occupied by current collectors and separators are reduced in the electrode stack, which leads to an increase of the gravimetric and volumetric energy density of the device. By reporting on this advantageous behavior in thick electrodes using coarse-grained carbons, we hope to garner interest toward an unexplored method for improving the performance of porous carbon-based supercapacitors , without increasing the cost or changing the current used supercapacitor manufacturing process.
研究领域:
电化学
·
能源材料
·
纳米材料科学
·
储能技术
·
功能材料
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Xiangxiang Du,Yadan Ran,Xuejun Shi,Kesheng Cao,Yongjun Han
The reduced graphene oxide/boron nitride (RGO/BN) hybrid film materials were prepared via ultrasonic blending, followed by the vacuum filtration film-forming and chemical reduction process. The fabricated free-standing RGO/BN hybrid films could combine the advantages of highly conductive RGO and pseudocapacitive BN. Notably, the optimized 1:1 RGO/BN hybrid film electrode delivered an areal capacitance of 513.4 mF cm −2 at 1 mA cm −2 , which was four times larger than that of RGO film. The introduction of BN drastically improved the areal capacitance and also demonstrated excellent capacitance retention. Furthermore, a symmetric supercapacitors device was constructed using the 1:1 RGO/BN hybrid film as two symmetrical electrodes. An areal energy density of 6.8 µWh cm −2 was attained at a power density of 800 µW cm −2 . This development opens avenues for the facile manufacturing of hybrid film as high-performance energy storage materials.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Jian Zhang,Haochen Qi,Jie Jayne Wu,Xuanjiao Mao,Hailin Zhang,Niloufar Amin,Feng Xu,Changkun Dong,Chunchang Wang,Pengjun Wang,Lei Zheng
Rapidly identifying and quantifying Gram-positive bacteria are crucial to diagnosing and treating bacterial lower respiratory tract infections (LRTIs). This work presents a field-deployable biosensor for detecting Gram-positive bacteria from exhaled breath condensates (EBCs) based on peptidoglycan recognition using an aptamer. Dielectrophoretic force is employed to enrich the bacteria in 10 s without additional equipment or steps. Concurrently, the measurement of the sensor’s interfacial capacitance is coupled to quantify the bacteria during the enrichment process. By incorporation of a semiconductor condenser, the whole detection process, including EBC collection, takes about 3 min. This biosensor has a detection limit of 10 CFU/mL, a linear range of up to 105 CFU/mL and a selectivity of 1479:1. It is cost-effective and disposable due to its low cost. The sensor provides a nonstaining, culture-free and PCR-independent solution for noninvasive and real-time diagnosis of Gram-positive bacterial LRTIs.
研究领域:
医学诊断
·
生物传感
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Technology
·
2023
·Vol. 11
·期 6
·2201358
·
IF 3.8
Ganghong Zhang,Xiaotian Wu,Tianlong Du,Yu Wang,Zhengying Liu,Wei Yang,Mingbo Yang
The challenge to prepare conductive hydrogel electrodes for stretchable supercapacitors with high areal capacitance and excellent stability during stretching has attracted tremendous attention from researchers. Herein, a method to enhance the performance of a conductive hydrogel electrode is reported. The in situ oxidative polymerization of aniline monomer is performed in the prestretched polyacrylamide (PAAm) hydrogel. After releasing the hydrogel, the polyaniline (PANI) nanoparticles can shrink with the PAAm substrate to form a dense and continuous conductive network. Due to the enhanced conductive networks, the prestretched PAAm-PANI conductive hydrogel with prestrain of 500% (PPCH 5 ) electrode shows high areal capacitance of 509.9 mF cm −2 at 0.5 mA cm −2 . The symmetrical stretchable supercapacitor based on PPCH 5 electrodes exhibits a high areal capacitance of 219.7 mF cm −2 . The device shows high capacitance retention of 68.5% even when stretched to 200% strain and noncapacitance decays after 2000 stretching cycles at 100% strain. This strategy can be expanded to the carbon nanotubes (CNT)-filled hydrogel systems. The PAAm-PANI-CNT conductive hydrogel with prestrain of 500%-based supercapacitor shows specific capacitance of 1429.87 mF cm −2 . The results demonstrate that prestretching is a highly effective method to enhance capacitance and stretching stability of PANI hydrogel electrode for stretchable supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-13
·
IF 2.8
Yu Haichao,Chen Xuan,Zhou Jie,Wang Hui
Zn-ion hybrid capacitors (ZIHCs) have been deemed a promising candidate for energy storage equipment to overcome the primary drawback of supercapacitors—low energy density. Herein, inspired by the laminated structure of chitin fibrils, molten salt strategy is proposed to engineer functional carbon as cathode material for ZIHCs, for the first time. Orthogonal design was adopted to ascertain the optimum synthetic conditions for the chitin-derived NaCl-templated and NaNO 3 -activated carbons (CNNs). The resultant C2NN1-800-1-5 possesses high surface area of 1256 m 2 g −1 and rich surface heteroatom content of 11.3 at%, as well as numerous thin intertwined nanofibre bundles. Associated with the synergy of surface capacitive reaction and diffusion battery behavior, the Zn//ZnSO 4 ( aq , 2 M)//C2NN1-800-1-5 ZIHC can be conducted in a relatively broad potential window ranging from 0 to 1.8 V and manifests remarkable energy density of 133.4 Wh kg −1 at 180 W kg −1 . Moreover, charge/discharge cycling further revealed that this device can retain 100% of its initial capacity, together with almost 100% coulombic efficiency after 10,000 cycles at 6 A g −1 . The study emphasizes the green synthesis of heteroatom-doped hierarchical porous carbon cathode material, notably facilitating the rapidly increasing popularity of Zn-ion hybrid energy storage devices.
研究领域:
材料科学
·
能源存储
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chong Bai,Qianying Lu,Ting Fang,Lin Wang,Sisi Li,Yong Lin,Yan-qing Lu,Desheng Kong
Stretchable supercapacitors are crucial for powering the next generation of wearable devices, but they face the challenge of insufficient areal capacitance. Although 3D electrodes improve the amount of active materials, their considerable thickness can increase stiffness and restrict deformability. Inspired by Armadillo's armor that incorporates rigid bony plates within elastic skin for optimal protection and flexibility, this study presents a 3D electrode designed to balance these conflicting requirements. The electrode comprises an array of densely packed, porous conductive pillars anchored to a soft current collector, effectively decoupling electrochemical and mechanical functions. The 900 µm-thick pillars act as a porous scaffold, enabling high loading of active material PEDOT at 10 mg cm −2 . Meanwhile, the current collector efficiently dissipates applied tension, resulting in exceptional deformability for the electrode. To demonstrate their practical application, these supercapacitors are integrated into a soft, untethered electronic system featuring a wireless charging circuit with a skin-conformal LED array for sustained operation. By effectively addressing the longstanding challenge of balancing high capacitance with mechanical compliance, this bioinspired electrode design establishes a transformative approach to create high-performance, deformation-resilient energy storage devices for wearable technologies.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 32
·16803-16811
·
IF 8.867
Na Li,Xuankai Huang,Haiyan Zhang,Zhicong Shi,Chengxin Wang
Transparent all-solid-state supercapacitors are advanced power supply devices for multifunctional high-end electronics. However, the areal capacitance is seriously limited due to the low mass loading, as high transmittance usually corresponds to ultra-small electrode thickness, which hinders practical applications. Here, we develop an effective three-dimensional (3D) architecture using plasma-etched micro-structured NaCl as the template. The film is assembled by graphene hollow-cube building units, and the faces of the cubes are graphene network microstructures. The graphene-network-face hollow-cube units (GNHC) fully exploit the large surface area of graphene, ensure the transparency of the film and reduce junction contact resistance between the graphene sheets. As expected, the film exhibits improved areal capacitance (5.48 mF cm−2), high volumetric energy (657.2 μW h cm−3), and power densities (954.3 mW cm−3). Generally, GNHC based films will be promising energy storage materials and very suitable supports or templates for construction of graphene-based composites.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 5
·2777-2788
·
IF 11.301
Zexin Liu,Xin Zhang,Cai Liu,Dongyang Li,Miaoxin Zhang,Fuxing Yin,Guoqing Xin,Gongkai Wang
Flexible fast-charging sodium ion storage devices are poised to transform the future wearable electronics industry, if the materials used to build such devices can present a versatile integration. Herein, inspired by ferroconcrete, nonwoven graphene fiber (GF) fabric reinforced electrodes were successfully demonstrated in flexible sodium ion capacitors (SICs). For the fabrics, the functionalities of fast electron transport and an ion permeation network, a highly compatible electrode material host, an efficient capacity contributor, and a robust flexible framework are synergistically integrated. These were provided by the high conductivity of the graphene sheets, the tunable porosity of the GF, and the interlocked structure, compatibility with materials, and the surface capacitive contribution of the fabrics. The nonwoven fabrics hosted multi-dimensional active materials as the ferroconcrete electrode exhibits exceptional electrochemical and mechanical properties individually. The SICs can complete an entire charge–discharge process within 15 s. A digital LED and watch powered using the flexible SICs with superior volumetric performances (12 mW h cm−3@37 mW cm−3, and 6 mW h cm−3@1.9 W cm−3) proved the practical capability of our design. We believe that the proposed nonwoven GF fabrics and the ferroconcrete electrode structure will become a universal design, and shed new light on flexible fast-charging sodium ion storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy Technologies and Assessments
·
2024
·
IF 7.1
Yuanyuan Zhang,Lu Wang,Dong Zhang
Structure supercapacitors (SSC) have aroused tremendous interest in building energy storage due to their dual function of electrochemical-mechanical properties. As well known, the low energy storage capacity limits their development. To enhance the energy density of SSC, lots of high-performance structural electrodes were developed. Herein, Mg and S elements were used to regulate the microstructure of the binary metal hydroxide, which could improve the electrode’s electrochemical performance. As we expected, rGO/N 1 C 3 Mg-S 4 ′ electrode exhibits high areal capacitance (10.20F/cm 2 ), which boosts the electrochemical capacitance of SSC. Our device based on rGO/N 1 C 3 Mg-S 4 ′ electrode exhibits a high areal capacitance (179.21 mF/cm 2 ) and a high energy density (56 μWh/cm 2 ) at 3 mA/cm 2 . More importantly, the electrochemical performance of our device doesn’t change obviously under a certain amount of pressure, demonstrating its good practical application potential in buildings.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Liqianyun Xu,Liuyang Zhang,Bei Cheng,Jiaguo Yu,Ahmed A. Al-Ghamdi,S. Wageh
Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor application. Herein, simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably enhanced. We discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated counterpart. The areal capacitance of the treated sample rockets up to 6.13 F cm −2 at 2 mA cm −2 , almost 13 times higher than the untreated ones. Besides, the resistance is substantially reduced by cyclic voltammetry treatment. Moreover, the Coulombic efficiency and stability are concurrently elevated. The reasons behind this treatment are mulled over and reasonable hypothesis is suggested. This study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）