Abstract

Development of metal-free electrocatalyst recycled from waste is highly beneficial for environment-friendly application. Effective oxygen reduction reaction (ORR) relies on physico-chemical properties of electrocatalyst. Herein, the present report demonstrates the ORR studies of metal-free carbon nanoelectrocatalyst processed from biomass of Allium sativum. Carbon nanoparticles (CNPs) with various nitrogenation have been achieved by tuning the pyrolytic condition (400–1000 °C), using single bio-resource without additional dopants/activators. Under optimal condition, CNPs processed from 800 °C exhibit superior oxygen reduction function in alkaline medium with a Tafel slope value of 81 mV/dec, suggesting that the co-existence of nitrogen species improved the oxygen reduction active sites. Spectroscopic studies reveal that the inherent nitrogenation enriched the defects with mesoporosity in the graphitic carbon network synergizing the interfacial electron diffusion. Biomass-derived CNPs enable altered chemical species under different pyrolytic conditions suitable for cost-efficient, scalable, and sustainable ORR application.

Graphic abstract

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中文翻译：

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大蒜生物废料中经处理的氮氧化碳纳米电催化剂用于氧还原反应

摘要

从废物中回收利用的无金属电催化剂的开发对于环境友好型应用非常有利。有效的氧还原反应（ORR）取决于电催化剂的物理化学性质。在此，本报告证明了从葱属生物质加工的无金属碳纳米电催化剂的ORR研究。。通过使用单一生物资源而不需要额外的掺杂剂/活化剂来调节热解条件（400–1000°C），已经实现了具有各种氮化作用的碳纳米颗粒（CNP）。在最佳条件下，从800°C处理的CNP在碱性介质中表现出优异的氧还原功能，Tafel斜率值为81 mV / dec，这表明氮物种的共存改善了氧还原活性位点。光谱研究表明，固有的氮化作用丰富了介孔电子在石墨碳网络中介孔扩散的缺陷。生物质衍生的CNP可以在不同的热解条件下改变化学物种，适用于经济高效，可扩展且可持续的ORR应用。

图形摘要

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