Structure, Phases, and Interfaces in Copper Oxide Ceramics for Photo- and Electrocatalytic CO2 Conversion

Prof. Dr. Cauê Ribeiro de Oliveira

EMBRAPA

Abstract

The catalytic performance of materials for CO₂ conversion is fundamentally rooted in their structural, phase, and interfacial characteristics. Oxide-based ceramics provide a robust and tunable platform for reactive environments due to their inherent chemical stability, defect chemistry, and process-driven microstructural control. In this talk, the recent advances in copper oxide ceramics (primarily CuO and Cu₂O) and related Cu-based systems as model materials for photo- and electrocatalysis in CO₂ conversion reactions will be discussed. Copper oxides uniquely combine multiple oxidation states, narrow band gaps, and versatile defect structures, making them ideal for investigating how ceramic-specific features determine catalytic pathways and efficiencies. The focus is on how processing parameters and thermal history (synthesis method, annealing, atmosphere) influence phase composition, grain boundary characteristics, exposed crystallographic facets, porosity, and heterointerface formation. Aspects as microstructural and interfacial attributes govern charge separation, surface adsorption, reaction selectivity, and long-term stability. Selected examples from photo- and electrocatalytic CO2 reduction systems illustrate the role of phase equilibria, junction engineering, and interface design in enhancing activity and selectivity.