Unlocking Zinc-Ion Energy Storage Performance of Onion-Like Carbon by Promoting Heteroatom Doping Strategy

• DOI: 10.1021/acsami.1c22016
• Publication Date: 2022-02-14T13:51:01Z
• Authors: Haorui Wang; Qun Chen; Pan Xiao; Liujun Cao
• Keywords: Heteroatom; Carbon fibers; Power density

Onion-like carbon (OLC) is one kind of a quasi-nanosphere with concentric graphite shell structure and abundant mesopores, which appropriate for high rate charging/discharging long-lifespan cycling. However, the moderate specific surface area seriously impeded its capacitance performance in comparison activated porous carbon. Herein, we have unlocked Zn ion storage OLC material through introducing N P dopants. Benefitting from fabricated N,P-OLC fully accessible external adsorption, proportion mesopores fast migration, synergistic effect co-doping matrix favoring chemical adsorption Zn2+ ions, when applied as cathode electrode hybrid supercapacitors (ZHSCs), such device can deliver 420.3 F g-1 (184.5 mA h g-1) at 0.5 A g-1, an outstanding retention capability 262.7 even 20 (∼63% retention), energy density 149.5 W kg-1, power 26.7 kW kg-1. Furthermore, this situ tightly integrate cloth (CC) or fiber to construct freestanding flexible electrode. The Zn//N,P-OLC@CC achieved 85.3 mW cm-2, 24.3 long-term cycling lifespan (77.8% after 50 000 cycles). At last, assembled quasi-solid-state fiber-shaped ZHSCs also present excellent flexibility practicality. Our study exhibits that act promising ZHSCs.