Synergistic Effects of Phosphorus and Boron Co-Incorporated Activated Carbon for Ultrafast Zinc-Ion Hybrid Supercapacitors
Synergistic Effects of Phosphorus and Boron Co-Incorporated Activated Carbon for Ultrafast Zinc-Ion Hybrid Supercapacitors
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DOI：
10.1021/acsami.0c10512
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发表时间：
2020-09-16
影响因子：
9.5
通讯作者：
An, Geon-Hyoung
中科院分区：
文献类型：
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作者：
Lee, Young-Geun;An, Geon-Hyoung
电化学电容器设备及其工业领域的快速发展已经创造了超过30000次循环的长周期稳定性以及超快性能（称为超快寿命）的需求。近年来，锌离子混合超级电容器（ZICs）由于具有较高的比容量和显著的循环稳定性而被认为是新兴的储能应用。然而，在克服与正极材料活性炭（AC）相关的超快性能和寿命限制方面，ZICs仍然面临着严峻的挑战，因为活性炭的电学性能不佳，电解质和电极之间的润湿性差，导致在高电流密度循环过程中比容量和寿命迅速下降。为了解决这些缺点，本文提出了一种新型的磷(P)和硼(B)共掺杂AC（简称P&B-AC），由于B掺杂而增强了电学性能，同时由于P掺杂而改善了润湿性，从而提供了超快寿命的zic。制备的zic具有优异的电化学性能，在0.5 a g（-1）时具有169.4 mAh g（-1）的优异比容量，在10 a g（-1）时具有84.0 mAh g（-1）的优异超快性能，并且在10 a g（-1）下具有高达88%的超快寿命，可达30 000次循环。优异的储能能力完全归因于P和B共掺杂的协同效应，这导致了交流阴极具有优异的Zn离子扩散能力和电荷转移过程。
The rapid expansion of the development of the electrochemical capacitor appliance and its industry areas has created the need for long cycling stability of over 30 000 cycles along with an ultrafast performance (referred to as ultrafast longevity). In recent years, zinc-ion hybrid supercapacitors (ZICs) are considered to be emerging energy storage applications thanks to their high specific capacity and remarkable cycling stability. However, ZICs still face serious challenges in overcoming the ultrafast performance and lifetime limitations related to the cathode materials, activated carbon (AC), due to inadequate electrical properties and poor wettability between the electrolyte and the electrode, which cause reductions in specific capacity and lifetime rapidly at high current densities during cycling. To address these drawbacks, a novel phosphorus (P) and boron (B) codoped AC (designated P&B-AC) is presented herein with enhanced electrical properties due to B-doping along with improved wettability due to P-doping to provide an ultrafast longevity ZICs. The prepared ZICs display a superior electrochemical performance with an excellent specific capacity of 169.4 mAh g(-1) at 0.5 A g(-1), a remarkable ultrafast performance of 84.0 mAh g(-1) at 10 A g(-1), and outstanding ultrafast longevity indicated by an 88% capacity retention for up to 30 000 cycles at 10 A g(-1). The excellent energy storage ability is firmly ascribed to the P and B codoping synergistic effect, leading to a superior diffusion capability of Zn ion and charge-transfer process of the AC cathode.