Jump to main content
Jump to site search

Issue 9, 2016
Previous Article Next Article

Deep eutectic solvent promoted one step sustainable conversion of fresh seaweed biomass to functionalized graphene as a potential electrocatalyst

Author affiliations

Abstract

Herein we report a facile method for the scalable production of Fe3O4/Fe doped graphene nanosheets (Fe3O4/Fe–GN) from a naturally abundant seaweed resource. The granules that remained after the recovery of liquid juice from a fresh brown seaweed, Sargassum tenerrimum, were utilized as a raw material and a deep eutectic solvent (DES) generated by the complexation of choline chloride and FeCl3 (ChoCl–FeCl3) was employed as a template as well as a catalyst for the production of graphene nanosheets. Pyrolysis of a mixture of seaweed granules and DES at 700–900 °C under a 95% N2 and 5% H2 atmosphere resulted in the formation of Fe3O4/Fe–GN with a high surface area (220 m2 g−1) and high electrical conductivity (2384.6 mS m−1). The synthesized nanosheets were then tested for their electrocatalytic activity in the oxygen reduction reaction (ORR) in an alkaline fuel cell. The electrocatalyst demonstrated a positive onset potential, high cathodic current density, low hydrogen peroxide formation (<5%) and ideal 4-electron transfer for the whole potential range in alkaline media. The present study successfully demonstrates the highly stable ORR activity of the electrocatalyst even after 30 000 cycles with a retention of >80% activity of the catalyst, making the functionalized graphene sheets derived from Sargassum tenerrimum a sustainable replacement for existing precious metal-based ORR catalysts.

Graphical abstract: Deep eutectic solvent promoted one step sustainable conversion of fresh seaweed biomass to functionalized graphene as a potential electrocatalyst

Back to tab navigation

Supplementary files

Article information


Submitted
28 Dec 2015
Accepted
21 Jan 2016
First published
26 Jan 2016

Green Chem., 2016,18, 2819-2826
Article type
Paper

Deep eutectic solvent promoted one step sustainable conversion of fresh seaweed biomass to functionalized graphene as a potential electrocatalyst

D. Mondal, M. Sharma, C. Wang, Y. Lin, H. Huang, A. Saha, S. K. Nataraj and K. Prasad, Green Chem., 2016, 18, 2819
DOI: 10.1039/C5GC03106K

Social activity

Search articles by author

Spotlight

Advertisements