@article{Qiu2025, 
author = {Daping Qiu and Yuehui Wang and Lulu Zhang and Hang Lei and Haizhou Ying and Jin Niu and Min Li and Xuelin Yang and Feng Wang and Ru Yang},
title = {Regulating the oxygen-atom configuration of carbon anode enabling extremely fast-charging potassium-ion hybrid capacitors},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {1},
pages = {94907033},
keywords = {carbon, anode, oxygen, epigallocatechin gallate, potassium-ion hybrid capacitor},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907033},
doi = {10.26599/NR.2025.94907033},
abstract = {Metal-ion hybrid capacitors, such as potassium-ion hybrid capacitors (PIHCs), are regarded as promising fast-charging energy storage devices. However, the kinetics mismatch between the battery anode and the capacitive cathode restricts their fast-charging performance. Precisely constructing carbon anodes with enhanced kinetics is an innovative approach to address this challenge. Herein, using epigallocatechin gallate with high oxygen content as the precursor, oxygen-enriched carbon materials (OEC) with tunable C=O content are successfully synthesized. Effortlessly, the C=O content of OEC is regulated by adjusting the pyrolysis temperature. Serving as an anode for PIHCs, OEC-600 with the highest C=O content exhibits an attractive fast-charging specific capacity of 135.2 mAh·g−1 at 20 A·g−1, along with a superior fast-charging cycling stability. Combining theoretical calculations, comprehensive kinetics analysis and in-situ Raman, the positive effects of C=O on the potassium storage capability and reversibility of OEC-600 are revealed. Consequently, PIHCs assembled based on an OEC-600 anode deliver impressive energy/power density of 145.1 Wh·kg−1/45.9 kW·kg−1 and superior fast-charging cycling stability with 87.5% of capacity retention over 20,000 cycles at 5 A·g−1. This work is anticipated to provide an optional design concept toward the carbon anode for fast-charging PIHCs.}
}