Boron/nitrogen co-doped helically unzipped multiwalled carbon nanotubes as efficient electrocatalyst for oxygen reduction

ACS Applied Materials & Interfaces
Alireza Zehtab YazdiUttandaraman Sundararaj

Abstract

Bamboo structured nitrogen doped multiwalled carbon nanotubes have been helically unzipped, and nitrogen doped graphene oxide nanoribbons (CNx-GONRs) with a multifaceted microstructure have been obtained. CNx-GONRs have then been codoped with nitrogen and boron by simultaneous thermal annealing in ammonia and boron oxide atmospheres, respectively. The effects of the codoping time and temperature on the concentration of the dopants and their functional groups have been extensively investigated. X-ray photoelectron spectroscopy results indicate that pyridinic and BC3 are the main nitrogen and boron functional groups, respectively, in the codoped samples. The oxygen reduction reaction (ORR) properties of the samples have been measured in an alkaline electrolyte and compared with the state-of-the-art Pt/C (20%) electrocatalyst. The results show that the nitrogen/boron codoped graphene nanoribbons with helically unzipped structures (CNx/CBx-GNRs) can compete with the Pt/C (20%) electrocatalyst in all of the key ORR properties: onset potential, exchange current density, four electron pathway selectivity, kinetic current density, and stability. The development of such graphene nanoribbon-based electrocatalyst could be a harbinger of p...Continue Reading

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Citations

Aug 13, 2015·The Journal of Physical Chemistry. B·Soheil SadeghiUttandaraman Sundararaj
Jun 2, 2015·ACS Nano·Alireza Zehtab YazdiUttandaraman Sundararaj
Jul 10, 2016·Journal of Colloid and Interface Science·Ashok Pullamsetty, Ramaprabhu Sundara
Jul 5, 2017·Macromolecular Rapid Communications·Alireza Zehtab YazdiUttandaraman Sundararaj
Sep 16, 2020·Chemistry : a European Journal·Ioanna K Sideri, Nikos Tagmatarchis
Apr 16, 2021·Small·Tewodros AsefaMaricely Ramírez-Hernández
Feb 1, 2018·Chemical Reviews·Andrew A GewirthAngela M DiAscro

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