Design Principles of Nitrogen-Doped Carbon Catalysts for Oxygen Reduction Reaction

IF 3.5 4区 化学 Q2 ELECTROCHEMISTRY
Kenji Hayashida, Bang Lu, Satoru Takakusagi, Junji Nakamura, Kotaro Takeyasu
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Abstract

Nitrogen-doped carbon catalysts are attracting significant attention as alternative electrocatalysts to platinum owing to their high activity and durability in fuel cells’ oxygen reduction reaction (ORR), resource availability, and low catalyst cost. Pyridinic nitrogen forms the active site of the ORR and that the reduction of pyridinium ions is discovered and adsorption of molecular oxygen are coupled with a unique reaction mechanism. The deactivation of nitrogen-doped carbon catalysts in acid electrolytes is attributed to the protonation of pyridinic nitrogen and the associated hydration is reported. This concept is demonstrated by the increased activity of nitrogen-doped graphene catalysts, whose hydrophobicity is enhanced by the 3D structure. To further enhance the catalytic activity of nitrogen-doped carbon catalysts, the electronic configuration of the active sites, particularly the degree of electron localization and spin, plays a crucial role. As an example, the introduction of active sites through five-membered ring structures is presented, along with their characterization by X-ray absorption spectroscopy.

Abstract Image

氧还原反应中氮掺杂碳催化剂的设计原理
氮掺杂碳催化剂因其在燃料电池氧还原反应(ORR)中的高活性和耐久性、资源可获得性以及催化剂成本低等优点而成为铂电催化剂的替代品。吡啶氮形成ORR的活性位点,发现了吡啶离子的还原和分子氧的吸附,并结合了独特的反应机理。本文报道了氮掺杂碳催化剂在酸性电解质中的失活是由吡啶氮的质子化引起的。氮掺杂石墨烯催化剂的活性增加证明了这一概念,其疏水性通过三维结构得到增强。为了进一步提高氮掺杂碳催化剂的催化活性,活性位点的电子构型,特别是电子的局域化程度和自旋程度起着至关重要的作用。作为一个例子,通过五元环结构引入活性位点,并通过x射线吸收光谱对其进行表征。
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来源期刊
ChemElectroChem
ChemElectroChem ELECTROCHEMISTRY-
CiteScore
7.90
自引率
2.50%
发文量
515
审稿时长
1.2 months
期刊介绍: ChemElectroChem is aimed to become a top-ranking electrochemistry journal for primary research papers and critical secondary information from authors across the world. The journal covers the entire scope of pure and applied electrochemistry, the latter encompassing (among others) energy applications, electrochemistry at interfaces (including surfaces), photoelectrochemistry and bioelectrochemistry.
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