ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Gang Liu,Lin Ma,Qiming Liu
The attempt of high output potential character has always been an enormous challenge for water-based supercapacitors. In this paper, we first synthesize leaf-like Co 3 O 4 @MnO 2 nanosheets on the carbon cloth fibers (Co 3 O 4 @MnO 2 CC) with hierarchical core-shell structure via a facile chemical bath deposition at low temperature. This leaf-like Co 3 O 4 @MnO 2 nanosheets not only afford the advantage of ultra-high output potential (1.2 vs (Ag/AgCl)/V), but also carry the superiorities of ultra-high specific capacitance (616.7 F g −1 at 2 A g −1 ) and remarkable cyclic stability (83.1% retention after 10000 cycles at 20 A g −1 ). The asymmetrical supercapacitor, assembled by using Co 3 O 4 @MnO 2 @CC-90 (CoMn@CC-90) as cathode and active carbon (AC) as anode, exhibits multiple merits of extra-high output potential (2.2 V vs AC/V), splendid specific energy (54.71 W h kg −1 at power density of 1.06 k W kg −1 ) and long cycle life (86.3% capacitance retention after 10000 cycles). Our work offers one novel kind of reference for water-based supercapacitors with both characteristics of high output potential and high specific capacitance.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zheng Zhou,Qilong Zhang,Zhao Zhang,Haoze Kuang,Xiangxin Du,Hui Yang
Harvesting mechanical energy based on piezoelectricity has attracted extensive attention, but achieving lead-free piezoelectric nanogenerators (PENGs) with high output current is still a big challenge, which severely limit their wide applications. Here, to address it, flexible composites with excellent piezoelectric capability are proposed and used to fabricate lead-free, high-current output PENGs using three-dimensional (3-D) interdigitated electrodes. By forming heterojunctions of Ag/(Ba,Ca)(Zr,Ti)O 3 (Ag/BCZT), polarization charges in BCZT nanowires unidirectionally transfer to Ag nanoparticles under external force, resulting in the enhanced piezoelectric outputs of Ag/BCZT nanowires embedded PVDF composites macroscopically. By creating multi-layered PENGs using 3-D interdigitated electrodes (IPNGs), the total amount of polarization charges increased, giving rise to the significantly improved output current. Optimally, the 4-unit IPNG can generate a proper voltage of 20 V and a considerable current of 15 μA (corresponding current density is 3.75 μA/cm 2 ), which is higher than the other lead-free piezoceramics based PENGs previously. The excellent outputs can also charge a 1 μF capacitor from 0 V to 5.3 V in 30 s (equivalent charge density is 272 μC/m 2 ). This work presents a brand-new paradigm for high-performance PENGs from the perspective of material and device design.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Hongji Wang,Wenpeng Liu,Jin Huang,Tianliang Xiao,Wenwei Lei,Faming Gao,Mingjie Liu
Confined by factors such as low operating voltage, poor temperature resistance, and instability at high voltage, the energy density of conventional symmetric aqueous supercapacitors is undesirable over a wide temperature range. It is still challenging to develop aqueous flexible supercapacitors (AFSCs) that can provide stable and high voltage output (>2.0 V) at extreme ambient temperatures. Here, a strategy for constructing AFSC with ultrahigh output voltages over a wide temperature range is proposed through the development of organohydrogel electrolytes (OHEs) with excellent water deactivation, which achieve a notable output voltage of 3.0 V, and unprecedented energy densities of 23.16 µWh cm −2 at −40 °C (beyond 25 °C), surpassing the performance of all previously reported symmetric supercapacitors with aqueous electrolytes. Theoretical calculations and experimental analyses show that OHEs can deactivate water to increase the output voltage limit of AFSCs by enhancing intermolecular interactions and regulating inter Helmholtz plane. Meanwhile, it also shows excellent flexibility and cycling stability (80.5% after 20 000 cycles at 25 °C and 97.0% after 50 000 cycles at −40 °C). More importantly, OHEs enable AFSCs switchable output voltages (from 2.5 to 3.0 V), making it possible to operate supercapacitors with high energy density and stability at low temperatures.
研究领域:
材料科学
·
能源技术
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zekun Li,Jitao Liu,Mengshuang Chi,Xue Miao,Hanxiao Yang,Weiqi Cui,Aifang Yu,Junyi Zhai
On the road to large-scale industrialization of triboelectric nanogenerators (TENGs), higher output is the constant quest. Here, inspired by the ubiquitous synergies in nature, an ultra-high-output TENG is proposed based on the synergistic effect of internal modification of materials along with the external integration of a charge pumping module. The carefully chosen poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) film possesses strong polarization and high permittivity, which leads to excellent triboelectric properties, and can be further enhanced by doping BaTiO 3 (BTO) nanoparticles . Meanwhile, the elaborately designed and optimized charge pumping module endows it with the ability to pump affluent charges. As a consequence, a TENG based on 8 µm P(VDF-HFP)/BTO 1 wt% composite film can achieve an ultra-high total transfer charge density (TTCD) of 3.5 mC/m 2 under optimal charge pumping conditions. Compared to the output of the P(VDF-HFP)/BTO-based TENG (0.1 mC/m 2 ) and the output of the P(VDF-HFP)-based TENG under charge pumping (2.6 mC/m 2 ), the output of the P(VDF-HFP)/BTO-based TENG under charge pumping is greater than the sum of the above two devices, which indicates that the proposed synergistic effect for designing an ultra-high-output TENG is remarkable and successful. Moreover, a novel charge transfer pattern based on synergistic effect is proposed, expounding the role inherent modifications of P(VDF-HFP) and external integration of charge pumping modules play. This work presents a concept that is at the forefront of contemporary designs for ultra-high output TENGs, providing insight into the preparation of high-performance TENGs in a state-of-the-art manner.
研究领域:
能源材料科学
·
纳米技术
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 38
·385403
·
IF 3.5
Jianwei He,Xuhua Guo,Caofeng Pan,Gang Cheng,Mingli Zheng,Yunlong Zi,Hongzhi Cui,Xiaoyi Li
Infectious diseases are spreading rapidly with the flow of the world's population, and the prevention of epidemic diseases is particularly important for public and personal health. Therefore, there is an urgent need to develop a simple, efficient and non-toxic method to control the spread of bacteria and viruses. The newly developed triboelectric nanogenerator (TENG) can generate a high voltage, which inhibits bacterial reproduction. However, the output performance is the main factor limiting real-world applications of TENGs. Herein, we report a soft-contact fiber-structure TENG to avoid insufficient friction states and to improve the output, especially at a high rotation speed. Rabbit hair, carbon nanotubes, polyvinylidene difluoride film and paper all contain fiber structures that are used to guarantee soft contact between the friction layers and improve the contact state and abrasion problem. Compared with a direct-contact triboelectric nanogenerator, the outputs of this soft-contact fiber-structure TENG are improved by about 350%. Meanwhile, the open-circuit voltage can be enhanced to 3440 V, which solves the matching problems when driving high-voltage devices. A TENG-driven ultraviolet sterilization system is then developed. The bactericidal rate of this sterilization system can reach 91%, which significantly reduces the risk of disease spread. This work improves a forward-looking strategy to improve the output and service life of the TENG. It also expands the applications of self-powered TENG sterilization systems.
研究领域:
纳米技术
·
生物医学工程
·
材料科学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 18
·2300650
·
IF 15.1
You Xue,Tao Yang,Yapeng Zheng,Kang Wang,Enhui Wang,Hongyang Wang,Laipan Zhu,Zhentao Du,Hailong Wang,Kuo-Chih Chou,Xinmei Hou
Piezoelectric nanogenerator (PENG) for practical application is constrained by low output and difficult polarization. In this work, a kind of flexible PENG with high output and self-polarization is fabricated by constructing CsPbBr 3 –Ti 3 C 2 T x heterojunctions in PVDF fiber. The polarized charges rapidly migrate to the electrodes from the Ti 3 C 2 T x nanosheets by forming heterojunctions, achieving the maximum utilization of polarized charges and leading to enhanced piezoelectric output macroscopically. Optimally, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits an excellent voltage output of 160 V under self-polarization conditions, which is higher than other self-polarized PENG previously. Further, the working principle and self-polarization mechanism are uncovered by calculating the interfacial charge and electric field using first-principles calculation. In addition, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits better water and thermal stability attributed to the protection of PVDF. It is also evaluated in practice by harvesting the energy from human palm taps and successfully lighting up 150 LEDs and an electronic watch. This work presents a new idea of design for high-performance self-polarization PENG.
研究领域:
材料科学
·
纳米技术
·
能量收集
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xueliang Zhang,Xiaoman Zhang,Xiaodong Zhang,Lefu Mei,Luoxin Wang,Hua Wang,Xiangming Li,Kun Nie
Lead-free halide perovskites have excellent optoelectronic properties and have been widely studied in the optoelectronic field. A kind of all-inorganic double perovskite crystals (PCs) with high output voltage and high sensitivity was successfully synthesized via a more energy-efficient crystallization method in this study. The luminescence intensity of the perovskite crystals was significantly enhanced by Bi 3+ doping. These perovskite crystals were used to prepare red light-emitting diodes (LEDs) with color purity of up to 93.1 %. In addition, the perovskite crystals were used to modify aramid chopped fibers (ACFs)/polyphenylene sulfide (PPS) composite fibers to fabricate flexible luminescent fibers. The modified composite fibers also demonstrated exceptional piezoelectric properties. Therefore, the modified composite fiber was used to prepare a piezoelectric sensor. The maximum output voltage of the sensor could reach 50 V at room temperature with a response time of only 8 ms. The piezoelectric constant d 33 of this piezoelectric sensor was 374 pC/N, indicating that the sensor had high sensitivity. When the temperature increased to 373 K, the output voltage gradually rose to 100 V. The red and white LED devices demonstrated the potential of perovskites for lighting and display applications. Meanwhile, the flexible light-emitting fibers and piezoelectric sensors further expanded the application scope of perovskite in multifunctional optoelectronic devices.
研究领域:
材料科学
·
光电领域
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 47
·26173-26182
·
IF 11.9
Xiaoyang Zhang,Xuefei Zhang,Xiaoxuan Fan,Hai-Tao Ren,Jia-Horng Lin,Ching-Wen Lou,Ting-Ting Li
Energy production based on traditional fossil fuels is facing the problem of resource depletion, and energy harvesting from environmental moisture and natural water sources has attracted a great deal of attention from many experts and scholars, and has become a very promising technology. However, the currently existing hydrovoltaic generators are mainly based on the design principle of building structural gradients in materials and constructing electrokinetic potentials through nanoporous structures, which makes it difficult to realize high power generation. Here, inspired by the double-layer electric capacitor, we designed a flexible high-output power aqueous voltaic generator using pure cotton fabric as a carrier and MXene as a substrate, relying on the nucleophilic reaction to autonomously mount the intercalation materials CNT and GO on the cotton fiber. The prepared aqueous voltaic generator was able to simultaneously generate an open-circuit voltage (Voc) of up to ∼0.25 V and a short-circuit current (Isc) output of ∼520 μA in just 5 mL of simulated seawater (3.5 wt% NaCl) solution, and the optimized samples were able to achieve actual output current powers of 394.64 μA and 62.3 μW. It is superior to the vast majority of existing wet power generators. It is noteworthy that connecting a certain number of samples in series can drive the operation of a display and small LED bulbs of different colors. In contrast to previously reported hydrovoltaic generators, the energy power of this capacitor-excited hydrovoltaic generator is derived from the diffusion of ions and the adsorption of ions by the electrodes themselves. This generator also provides a way to generate power efficiently in a variety of water environments, which greatly broadens the working scenarios and improves the adaptability of the device in complex environments.
研究领域:
能量收集
·
材料科学
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2016
·
IF 18.96
Hao Sun,Xuemei Fu,Songlin Xie,Yishu Jiang,Huisheng Peng
A new family of energy-storage devices is created by mimicking the electric eel to obtain a high output voltage. These novel energy-storage devices are flexible, stretchable, and weavable fibers, which satisfies the needs of next-generation portable and wearable electronics. The devices are fabricated via a continuous fabrication technology to effectively power electronic watches and light-emitting diodes as two examples.
研究领域:
能量存储
·
柔性电子学
·
仿生工程
·
材料科学
·
可穿戴技术
✓ 已验证
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 22
·2300818
·
IF 6.8
Minmin Wang,Qinglin Chen,Wenwu Zhao,Yanfeng Tang
Triboelectric nanogenerators (TENGs) with great potential in the field of energy collection and self-powered sensing have attracted great attention. However, most of the TENGs are limited by their unsatisfactory electrical output performance and mechanical properties in utilized as wearable and flexible microelectronic devices. Herein, a flexible single-electrode triboelectric nanogenerator composed of bismuthene (Bi-ene) nanosheets embedded in a polydimethylsiloxane (PDMS) film is proposed. The Bi-ene nanosheets embedded in the PDMS film act as micro-capacitors, which enable the Bi-ene@PDMS film to withstand high voltage and store more electrical energy. As a result, the Bi-ene@PDMS based TENG exhibits 26 times more power density than that of the pure PDMS based TENG at the optimum Bi-ene content. Moreover, the prepared TENG based e-skin can meet the practical needs of power supply, motion sensing, and tactile sensing. The results can provide fundamental insights for the design of high-performance flexible TENG.
研究领域:
材料科学
·
纳米技术
·
能量收集
·
可穿戴技术
·
传感器
✓ 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）