@article{Ahmad2026, 
author = {Touqeer Ahmad and Zhengxin Zhu and Muhammad Sajid and Weiping Wang and Yirui Ma and Xiang Chu and Nawab Ali Khan and Mohsin Ali and Shuang Liu and Saba Hazoor and Guili Zhao and Aoun Raza and Wei Chen},
title = {pH-Universal, High-Performance RuO2 Pseudocapacitors Powered by Hydrogen Battery Chemistry},
year = {2026},
journal = {Energy Material Advances},
volume = {7},
pages = {0304},
url = {https://www.sciopen.com/article/10.34133/energymatadv.0304},
doi = {10.34133/energymatadv.0304},
abstract = {Supercapacitors are at the forefront for powering next-generation electronic devices and offer instantaneous power supply and fast response times. However, the bottleneck lies in designing electrode materials with high capacitance and high energy density. Here, we report a pH-universal RuO2-based electrocatalytic hydrogen gas capacitor (EHGC). This innovation marks an important leap in pseudocapacitor technology, enabling exceptional chemical stability and catalytic versatility across a wide pH range. This versatility is ascribed to the robustness of RuO2 and the catalytic properties of hydrogen electrode, resulting in a hybrid system with superior capacitance and energy density. RuO2-EHGC delivers a high capacitance of 626 F/g and an energy density of 57 Wh/kg at a power density of 200 W/kg in the acidic electrolyte, as well as 80 Wh/kg at 459 W/kg in the alkaline electrolyte at a current density of 1 A/g. Furthermore, RuO2-EHGC exhibits capacitance retention of 82% after 100,000 cycles at a high current of 30 A/g. The charge storage mechanism is evaluated using ex situ Raman and x-ray photoelectron spectroscopy, which confirms the reversibility of the capacitive charge storage process. This study shows a new approach to the development of high-performance pseudocapacitors, which has the potential to open new avenues of green and sustainable energy storage devices.}
}