The positive piezoconductive effect in graphene

Xu, Kang; Wang, Ke; Zhao, Wei; Bao, Wenzhong; Liu, Erfu; Ren, Yafei; Wang, Miao; Fu, Yajun; Zeng, Junwen; Li, Zhaoguo; Zhou, Wei; Song, Fengqi; Wang, Xinran; Shi, Yi; Wan, Xiangang; Fuhrer, Michael S.; Wang, Baigeng; Qiao, Zhenhua; Miao, Feng; Xing, D. Y.

doi:10.1038/ncomms9119

Cited by 58 publications

(53 citation statements)

References 31 publications

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“…[110] Several studies also tried to integrate PSC with energy-storage devices for SCPSs. [111,112] [111] The solar-to-battery overall efficiency was 7.80%, and the system showed stable cycling performances. Another work combined series-connected PSCs with a polypyrrole-based supercapcitor.…”

Section: Scps With Separate Unitsmentioning

confidence: 99%

Toward Wearable Self‐Charging Power Systems: The Integration of Energy‐Harvesting and Storage Devices

Wang

2017

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devices) of electronics miniature, thin, lightweight, flexible, foldable, stretchable, self-healable, implantable, or wearable. [2][3][4] One of the key challenges for wearable electronics is to find suitable and sustainable power sources. Electrochemical energy-storage devices, especially rechargeable lithium-ion batteries (LIBs), have been widely applied and successfully promoted the thriving growth of portable electronics for decades. However, stateof-the-art batteries' technology is, increasingly, becoming a bottleneck for the rapid advancements of wearable electronics for the following reasons: first, the high power consumption of multifunctional electronics requires energy-storage devices with higher energy in smaller volume or lighter weight so that longer operational time or less frequent recharging can be achieved for the convenience of consumers; second, batteries or supercapacitors typically feature a configuration of stacked planar porous electrodes with inorganic oxide-, phosphate-, or hydroxidebased active materials, which make them hard to be flexible or stretchable. [5,6] Tremendous efforts have been dedicated to improve the energy density of batteries or supercapacitors, [7,8] or developing flexible/wearable batteries/supercapacitors. [9] These progresses have been summarized in other reviews and will not be included here. [10][11][12] Despite these advancements, the battery or supercapacitor, still, can hardly meet the above requirements of wearable electronics. [13] Therefore, extensive research interest recently turns to the assistance of energyharvesting or conversion devices, in a way that energy-storage and -harvesting technologies are combined into self-charging power systems (SCPSs) for wearable electronics, as schematically illustrated in Figure 1. [14][15][16] Energy-storage and -harvesting technologies have always been two blades of a sword. Renewable energy resources (e.g., solar, wind, vibration, or biomass) are highly dependent on when and where they are available, which makes energy-storage devices (e.g., battery, capacitors, pump hydro, or compressed air) indispensable for stable or smart power supply. Portable/ wearable energy-storage devices possess limited energy, making it an effective strategy to utilize wearable energy-harvesting devices to compensate the energy consumption of the batteries/ supercapacitors, so as to elongate the operational time, reduce the recharging frequency, or even form a self-sufficient power system for the electronics. Various technologies have been developed to convert the environmental energies into electricity, One major challenge for wearable electronics is that the state-of-the-art batteries are inadequate to provide sufficient energy for long-term operations, leading to inconvenient battery replacement or frequent recharging. Other than the pursuit of high energy density of secondary batteries, an alternative approach recently drawing intensive attention from the research community, is to integrate energy-generation and energy-storage devices ...

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Section: Scps With Separate Unitsmentioning

confidence: 99%

Toward Wearable Self‐Charging Power Systems: The Integration of Energy‐Harvesting and Storage Devices

Wang

2017

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312

161

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“…Lasing actions from N + 2 ions have been experimentally observed by several research groups since the first report in 2011. [22,25,[27][28][29][30][66][67][68][69][70][71][72][73][74][75][76][77] Besides its promising application in the remote sensing similar to the other two types of air lasing, the understanding of the physical procedure in N + 2 lasing is also attracting great interests. Moreover, the generation of N + 2 lasing is the result of a complex interaction between strong laser fields and nitrogen molecules.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

“…[86][87][88][89][90][91] On the other hand, the understanding of the gain mechanism in N + 2 lasing is highly desired in the strongfield-ionization framework, which has motivated many tentative and interesting explanations. [66,69,72,74,76,83,[86][87][88][89][90][91][92][93][94][95][96][97][98][99] Up to now, it is still lack of a complete physical picture to explain all key experimental observations on N + 2 lasing. Thus, the exploration of the underlying origin of the ultrafast gain in the strong-field ionized molecules is of significant importance for understanding the fundamental physics in the interaction between the strong laser field and molecules.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

“…Based on the fact that a picosecond-delayed external seed is significantly amplified for both the co-propagation and counterpropagation cases of the pump and seed pulses, this kind of lasing action is attributed to the seed amplification in N + 2 ions with the population inversion. [92] Some scenarios have been proposed to explain its ultrafast gain, including the collisional excitation of rescattering electrons, [87,96] multiple-states couplings, [69,75,95,[97][98][99] the alignment-induced transient inversion, [72,94] etc. For details of this specific subject, one can refer to a recent review.…”

Section: Key Observations and Basic Propertiesmentioning

confidence: 99%

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Recent Advances in Air Lasing: A Perspective from Quantum Coherence

et al. 2019

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The research topic of air lasing is of fundamental and practical importance, which has grown rapidly in the past decade. Air lasing, or a laser‐like emission from air species including atomic oxygen, atomic argon, atomic nitrogen, molecular nitrogen, and molecular nitrogen ions, has been investigated vastly in both experiment and theory. In this review, the basic concepts of air lasing are discussed and the crucial role of quantum coherence in the air‐lasing process is highlighted. As an exciting perspective, air lasing not only exhibits important fundamental physics such as superradiance, nonlinear effects, vibrational and rotational dynamics, but also shows potential practical implications toward remote sensing.

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“…Supercapacitors can be designed to store renewable solar electricity to manage the complex balance between supply and demand. [41][42][43][44][45] SCs require short charging times and deliver high power densities. Therefore SCs could offer a viable approach to store solar electricity from sun to dawn and night.…”

Section: Asc Combined With Solar Cell Modulementioning

confidence: 99%

Scalable Asymmetric Supercapacitors Based on Hybrid Organic/Biopolymer Electrodes

Ajjan

Vagin

Rębiś

et al. 2017

Advanced Sustainable Systems

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lately. Supercapacitor devices allow a considerable amount of stored electric energy to be delivered rapidly, giving rise to high power capability in conjunction with long cycling life and high reversibility. [4][5][6][7] Nevertheless the demand for higher energy density supercapacitors is increasing, to be used as a storage device for renewable electricity.The development of new materials that improve the efficiency of energy conversion and storage is essential for a sustainable future. [8][9][10] These materials should be renewable, biodegradable, and have low cost. [11] Lignin is the second most abundant biopolymer on Earth, and complies with these characteristics. It is the largest natural source of quinone-aromatics chemical groups that can be employed to store and deliver charges by reversible Faradaic reactions. [12,13] However, the insulating nature of lignin limits the access to these functional redox groups. Therefore, it is necessary to form hybrids with other conductive materials such as conducting polymers [14] or carbon derivatives. [15][16][17] In order to harness the potential of conducting polymers as supercapacitor electrode materials, it is critical to improve their poor long-term stability and to increase their specific capacitance and energy density by fully utilizing the pseudo-capacitive redox processes. [18][19][20] In our previous work, we have constructed electrodes with hybrid materials based on electronic polymers and lignin derivatives. We found that the best combination was poly(3,4-ethylenedioxythiophene) PEDOT/lignin with a specific capacitance of 170 F g −1 . [21] We further investigated the interpenetrating network of poly(aminoanthraquinone) (PAAQ) and PEDOT with increased specific capacitance up to 383 F g −1 . [22] The development of hybrid electrode materials formed by electroactive and conducting components enable supercapacitor devices with intrinsic high specific power and improved energy density. These devices are described as symmetric SCs (SSCs) when both electrodes are identical, and asymmetric SCs (ASCs) when the material compositions of the positive and negative electrodes are different. The optimal performance is expected for asymmetric supercapacitors, because it may be possible to extend the operating voltage window of the cell, and its energy density thus becomes greater than that of the symmetric cells, as a consequence of electrodes operating reversibly in different potential ranges. [19,[23][24][25] A trihybrid bioelectrode composed of lignin, poly(3,4-ethylenedioxythiophene) (PEDOT), and poly(aminoanthraquinone) (PAAQ) is prepared by a two-step galvanostatic electropolymerization, and characterized for supercapacitor applications. Using PEDOT/Lignin as a base layer, followed by the consecutive deposition of PAAQ, the hybrid electrode PEDOT/Lignin/PAAQ shows a high specific capacitance of 418 F g −1 with small self-discharge. This trihybrid electrode material can be assembled into symmetric and asymmetric supercapacitors. The asymmetric supercapacitor uses PED...

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The positive piezoconductive effect in graphene

Cited by 58 publications

References 31 publications

Toward Wearable Self‐Charging Power Systems: The Integration of Energy‐Harvesting and Storage Devices

Toward Wearable Self‐Charging Power Systems: The Integration of Energy‐Harvesting and Storage Devices

Recent Advances in Air Lasing: A Perspective from Quantum Coherence

Scalable Asymmetric Supercapacitors Based on Hybrid Organic/Biopolymer Electrodes

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