Optimization of O2 evolution electrocatalytic activity via engineered one-pot synthesized ZnSe/CoSe2@N-doped C composite

Abstract

In this study, we utilized a one-pot calcination process of zeolitic imidazolate frameworks (ZIFs) to create ZnSe/CoSe₂@N-doped C composites. These serve as cost-effective and efficient alternatives to precious-metal-based catalysts for water electrolysis. The synthesis process addresses the issue of Co agglomeration, a common factor that typically degrades electrocatalytic performance, by incorporating Zn into the ZIF structure. This addition stabilizes the compound during electrolysis, preventing degradation. Optimizing the Zn/Co ratio is essential for enhancing the oxygen evolution reaction (OER). Our results demonstrate that adjusting this ratio leads to a significant improvement in mass activity. Through extensive physical and electrochemical analyses, we confirmed the synergistic interactions between Zn and Co, underscoring the potential of ZnSe/CoSe₂@N-doped C composites as durable electrocatalysts. This study not only advances catalyst design for water electrolysis through metal stoichiometry manipulation but also promotes the development of economical and efficient water-splitting systems.