Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Fundamentals of Catalysis II

O 82.9: Vortrag

Donnerstag, 4. April 2019, 17:00–17:15, H5

Artificial Leaf, catalysis of oxygen evolution with the doping of hematite — •Huu Chuong Nguyën¹, Felipe Andrés Garcés-Pineda¹, Mabel de Fez Febré¹, José Ramón Galán-Mascarós^1,2, and Núria López¹ — ¹Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona (Spain) — ²Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys, 23 , Barcelona 08010,Spain

A-LEAF is a project of the European Commission for developing an efficient and economically viable photoelectrocatalytic cell (PEC). The goal is to recycle CO₂ to fuel like an artificial leaf. The two most important reactions in a PEC are CO₂ reduction and oxygen evolution reaction (OER). These processes are energetically costly and but can be improved with catalysis. There are several possible strategies for optimisations. One of them is by doping a material to reduce the energy barrier and improve the kinetics. In this talk, we will present the general framework of A-LEAF, the basic concepts and theory of catalysis, Density Functional Theory, CO₂ reduction and oxygen evolution with a practical example; the doping of hematite as a model catalyst for the OER. Hematite (α−Fe₂O₃) is a non-toxic, cheap and abundant material. Doped with redox or non-redox active species, it presents very different performances and catalytic pathways. Using both experimental and theoretical techniques, we will show how doping with non-redox and redox dopants differs, how Proton-Coupled-Electron-Transfer is involved and how this affects the global catalytic performance.