ORR Mechanism on Pt

Oxygen reduction reaction on a Pt electrode has been the most extensively studied mechanism. This catalytic ORR is a multi-electron process with a number of 

The ORR mechanism on Pt has also been investigated by theoretical calculation based on the electronic structure, using density functional theory [43 5]. The dissociative mechanism and the associative mechanism are proposed for a low current density range and a high current density range, respectively [43,44]  

Since there is no adsorbed O2 on the Pt surface, H2O2 cannot be formed. This mechanism can be considered a detailed form of the direct 4-electron pathway. 

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Chapters 7-12 focus on the electrocatalysis of carbon-based non-precious metal catalysts. The unique properties and fuel cell applications of various carbon based catalysts are intensively discussed in these chapters. Chapter 7 summarizes the fundamental studies on the electrocatalytic properties of metallomacrocyclic and other non-macrocyclic complexes. Chapter 8 and 9 review the progress made in the past 5 years of pyrolyzed carbon-supported nitrogen-coordinated transition metal complexes. Chapter 10 gives a comprehensive discussion on the role of transitional metals in the ORR electrocatalysts in acidic medium. Chapter 11 introduces modeling tools such as density functional theory (DPT) and ah initio molecular dynamics (AIMD) simulation for chemical reaction studies. It also presents a theoretical point of view of the ORR mechanisms on Pt-based catalysts, non-Pt metal catalysts, and non-precious metal catalysts. Chapter 12 presents an overview on recent progresses in the development of carbon-based metal-free ORR electrocatalysts, as well as the correlation between catalyst structure and their activities. 

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