Carbon and Oxygen-Doped Phosphorus Nitride (COPN) for Continuous Selective and Stable H₂O₂ Production

Abstract

High Resolution Image Download MS PowerPoint Slide Carbon and oxygen-doped phosphorus nitride (COPN) materials were synthesized via a template-assisted chemical vapor deposition (CVD)-like method. The COPN catalysts exhibited remarkable 2e – oxygen reduction reaction selectivity for H 2 O 2 production across various pH environments, with COPN-3 displaying the highest selectivity up to 93.2%. Through optimization under continuous flow conditions using a flow cell, COPN-3 achieved a cumulative H 2 O 2 concentration of up to 8 wt % with a remarkable Faraday efficiency of 99% and production rates of 17,670 mmol h –1 g catalyst –1 (basic electrolyte) and 25,758 mmol h –1 g catalyst –1 (neutral electrolyte). The catalyst maintained stable H 2 O 2 production during a 70 h chronoamperometry, demonstrating its viability for practical electrocatalytic H 2 O 2 production. Furthermore, a proof concept for utilizing the H 2 O 2 generated under continuous flow conditions was demonstrated through an in situ oxidative degradation of various organic dyes. These results highlighted the promising electrocatalytic properties of COPN for practical H 2 O 2 production and its versatility in practical applications.