Jump to main content
Jump to site search

Issue 3, 2020
Previous Article Next Article

Complementary behaviour of EDL and HER activity in functionalized graphene nanoplatelets

Author affiliations

Abstract

Green hydrogen production is a vital requirement of the upcoming hydrogen fuel-based locomotion and economy. Water electrolysis facilitated by electricity derived from renewable sources and direct solar-to-hydrogen conversion centred on photochemical and photoelectrochemical water splitting is a promising pathway for sustainable hydrogen production. All these methods require a highly active noble metal catalyst to make the water-splitting process more energy-efficient and in order to make it economical, metal-free hydrogen evolution catalysts such as graphene nanoplatelets (GNPs) are essential. Herein, we report the effect of a range of functionalizations on the catalytic properties of graphene nanoplatelets (GNPs) for the hydrogen evolution reaction (HER). We also account for the effect of functionalization on the strength of the electrical double layer formation on the surface of functionalized GNPs. It is observed that the catalytic activity and the electrical double layer strength are inversely related to each other. Our first-principles-based density functional theoretical (DFT) modelling unravels the origin of the observed electrocatalytic activity and its trend and the strength of the electrical double layers in terms of free energy changes during the ion absorption/desorption events on the electrode surface. Based on our observations, minimizing the electrical double layer strength is identified as an approach to improve the catalytic performance of the catalysts.

Graphical abstract: Complementary behaviour of EDL and HER activity in functionalized graphene nanoplatelets

Back to tab navigation

Supplementary files

Article information


Submitted
19 Sep 2019
Accepted
08 Dec 2019
First published
09 Dec 2019

Nanoscale, 2020,12, 1790-1800
Article type
Paper

Complementary behaviour of EDL and HER activity in functionalized graphene nanoplatelets

A. B. Puthirath, S. Shirodkar, M. Fei, A. Baburaj, K. Kato, S. K. Saju, R. Prasannachandran, N. Chakingal, R. Vajtai, B. I. Yakobson and P. M. Ajayan, Nanoscale, 2020, 12, 1790
DOI: 10.1039/C9NR08102J

Social activity

Search articles by author

Spotlight

Advertisements