Joule-Heating-Synthesized Iodine–Nitrogen Metal-Free Nanofiber for H<sub>2</sub>O<sub>2</sub> Electroproduction via a Coordination Microenvironment Regulation Strategy
Yao Hu, Haihui Lan, Qinyuan Hu, Jiaxuan Gong, Liuhong Yang, Zhaoyu Wang, Tianyi Han, Xingchen Jiao, Dongjian Shi, Mingqing Chen, Baochun Guo, Mingliang Du
Abstract
The increasing demand for hydrogen peroxide (H 2 O 2 ) necessitates greener production methods. In response, we developed an iodine–nitrogen-codoped metal-free carbon catalyst using the coordination microstructure regulation strategy, combined with rapid Joule heating for precise iodine and nitrogen doping. This approach allows precise control over the formation of active iodine–nitrogen coordination sites, significantly enhancing the catalytic performance for H 2 O 2 production via the two-electron oxygen reduction reaction. Among the synthesized catalysts, I–N 4 demonstrated superior catalytic activity, achieving a high H 2 O 2 selectivity of 90–96% and a production rate of 1265 mg L –1 h –1 at −0.4 V vs reversible hydrogen electrode. Operando Raman spectroscopy confirmed the dynamic evolution of intermediates during the reaction, while chronoamperometric tests showed long-term stability. This scalable, energy-efficient synthesis method offers significant potential for sustainable energy and environmental applications.