【摘 要】
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Integrating the merits of long lifespan and excellent energy as well as power densities,potassium-ion hybrid capacitors (PIHCs) exhibit great prospects for future energy storage devices.To boost comprehen-sive performance of PIHCs,heteroatom-doping and mo
【机 构】
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School of Materials Science and Engineering,University of Shanghai for Science & Technology,Shanghai
论文部分内容阅读
Integrating the merits of long lifespan and excellent energy as well as power densities,potassium-ion hybrid capacitors (PIHCs) exhibit great prospects for future energy storage devices.To boost comprehen-sive performance of PIHCs,heteroatom-doping and morphology-tuning as two comprehensive strategies have been devoted to designing uniquely structural carbon-based materials with favorable advantages.An ideal strategy for simultaneous atomic doping and structural regulation is expected to be developed.Herein,we propose a novel “Killing Two Birds with One Stone” strategy to prepare a tri-elements doped hollow carbon sphere (TED-HCS) as PIHCs anodes,that is,a single template of spherical CoP particles is rationally adopted,which not only provides both a P source for heteroatom-doping but also acts as a self-sacrificial template for hollow-structure engineering.The multifunctional TED-HCS presents a high capacity of 473.0 mAh g-1 and excellent rate performance of 212.5 mAh g-1 at 5.0 A g-1.Remarkably,the as-assembled PIHCs show outstanding energy/power density (40.4 Wh kg-1/10500 W kg-1) and remain high-capacity retention of 89.15％ even cycling 12,000 times.The “Killing Two Birds with One Stone” strategy offers new insight into the search for the preparation of carbon-based materials with multi-elements doping and specific morphology structure.
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