Supercapacitors with improved specific capacitance, long cycling life, high power density, and relatively high energy density were fabricated to close the gap between traditional and emerging energy storage. We developed interactive supercapacitor electrodes with heterojunctions composed of well-aligned ternary metal oxides ribbon arrays. These electrodes composed of ribbon arrays retained their crystallographic structure during charging and discharging processes, enabling high steadiness. These metallic oxide electrodes demonstrated a specific capacitance and the effective diffusion coefficient. The symmetrical supercapacitor device assembled by these electrodes achieved a high energy density of 138 W h kg-1 at a power density of 450 W kg-1 and retained at 81.0 W h kg-1 at 9000 W kg-1. These binderless single cell devices with simplified design showed 10-20 times higher in energy density in comparison with reported results. The architectural nanografting increased highly reactive interfaces with interpenetrating channels for efficient ion transport and electron conduction. The advances to design nanostructured supercapacitor materials are based on these heterojunction arrays, which enhanced their properties including specific capacitance, energy density, and cycle stability.

Symmetric supercapacitors composed of ternary metal oxide electrodes used for emerging energy storage

ACS Fall 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.