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    Home > Professor Yang Ru and Professor Wang Feng of Beijing University of Chemical Technology reported a new strategy to build a high performance potassium ion hybrid capacitor

    Professor Yang Ru and Professor Wang Feng of Beijing University of Chemical Technology reported a new strategy to build a high performance potassium ion hybrid capacitor

    • Last Update: 2020-01-03
    • Source: Internet
    • Author: User
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    Recently, Professor Yang Ru and Professor Wang Feng from the school of materials, Beijing University of chemical technology published a research paper entitled "dynamics enhanced nitrogen dowed hierarchical groups hollow carbon spheres boosting advanced potassium ion hybrid captors" in the international authoritative journal advanced functional materials, reporting that A new strategy for building high performance potassium ion hybrid capacitors Nowadays, the demand for energy storage equipment with high energy and power density is increasing in the field of energy storage, which promotes the development of new energy storage systems represented by hybrid capacitors Due to its higher natural abundance than lithium, lower redox potential than sodium and solvated ion radius, potassium based hybrid capacitors are considered to be a new type of hybrid capacitors with great application value However, due to the current research on potassium ion hybrid capacitors is still in its infancy, there are few reports on high-performance potassium ion hybrid capacitors Therefore, it is of great significance to explore the optimization principle of the equipment structure and understand the reaction dynamics inside the equipment for promoting the development of potassium ion hybrid capacitors In this study, the researchers first successfully applied sodium alginate with excellent bonding performance to solve the problem of poor coating performance of carbon materials, and prepared potassium ion hybrid capacitor anode with high reversible capacity, excellent rate performance and long-term cycle stability The results show that the nano carbon spheres with sodium alginate as binder have the best potassium storage capacity, the reversible specific capacity of 322 Ma h g − 1 at the current density of 0.1 C (1c = 280 Ma g − 1), the observable specific capacity of 134 Ma Hg − 1 at the high current density of 20 C, and the excellent cycling capacity of 500 at the current density of 5 C The capacity retention rate was 81% Based on the kinetic analysis and DFT calculation, the fundamental source of the excellent electrochemical properties of the carbon nanospheres was analyzed, and the binding mechanism of sodium alginate was demonstrated by targeted experiments Finally, the all carbon potassium ion hybrid capacitor with high energy / power density (114.2wh kg − 1, 8203w kg − 1) and long cycle capacity (80.4% capacity retention after 5000 cycles at current density of 2ag − 1) was successfully constructed with the nano carbon spheres and their activated products as negative and positive electrodes respectively, and sodium alginate as binder This work provides a new reference for the future development and application of potassium ion hybrid capacitors The first author of this paper is Qiu Daping, a doctoral student, Professor Yang Ru and Professor Wang Feng are the corresponding authors of this paper This research work is supported by NSFC.
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