Boosting Zn‐Ion Energy Storage Capability of Hierarchically Porous Carbon by Promoting Chemical Adsorption

• DOI: 10.1002/adma.201904948
• Publication Date: 2019-09-16T07:55:52Z
• Authors: Haozhe Zhang; Qiyu Liu; Yuanbin Fang; Chunlin Teng; Xiaoqing Liu; Pingping Fang; Yexiang Tong; Xihong Lu
• Keywords: Carbon fibers; Power density; Chemical state

The construction of advanced Zn-ion hybrid supercapacitors (ZHSCs) with high energy density is promising but still challenging, especially at current densities. In this work, a high-energy and ultrastable aqueous ZHSC demonstrated by introducing N dopants into hierarchically porous carbon cathode for the purpose enhancing its chemical adsorption Zn ions. Experimental results theoretical simulations reveal that doping not only significantly facilitates process ions, also greatly increases conductivity, surface wettability, active sites. Consequently, as-fabricated based on N-doped displays an exceptionally 107.3 Wh kg-1 4.2 A g-1 , superb power 24.9 kW ultralong-term lifespan (99.7% retention after 20 000 cycles), substantially superior to state-of-the-art ZHSCs. Particularly, such leads quasi-solid-state device satisfactory storage performance, delivering remarkable 91.8 . boosted strategy tuning capability applicable other materials.