Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

INFLUENCE OF GRAPHENE OXIDE ON THE TEXTURE AND CHEMISTRY OF N, S-DOPED HIGHLY POROUS CARBON AND IMPLICATIONS FOR ELECTROCATALYTIC AND ENERGY STORAGE APPLICATION POTENTIAL

Samantha K. Samaniego Andrade
,
Shiva Shankar Lakshmi
ORCID logo ,
István Bakos
,
Szilvia Klébert
,
Kun Robert
ORCID logo ,
Miklós Mohai
,
Balázs Nagy
,
Krisztina László
*
Version 1 : Received: 12 July 2023 / Approved: 13 July 2023 / Online: 13 July 2023 (10:27:41 CEST)

A peer-reviewed article of this Preprint also exists.

Samaniego Andrade, S.K.; Lakshmi, S.S.; Bakos, I.; Klébert, S.; Kun, R.; Mohai, M.; Nagy, B.; László, K. The Influence of Reduced Graphene Oxide on the Texture and Chemistry of N,S-Doped Porous Carbon. Implications for Electrocatalytic and Energy Storage Applications. Nanomaterials 2023, 13, 2364. Samaniego Andrade, S.K.; Lakshmi, S.S.; Bakos, I.; Klébert, S.; Kun, R.; Mohai, M.; Nagy, B.; László, K. The Influence of Reduced Graphene Oxide on the Texture and Chemistry of N,S-Doped Porous Carbon. Implications for Electrocatalytic and Energy Storage Applications. Nanomaterials 2023, 13, 2364.

Abstract

High surface area carbon was obtained from -carrageenan – urea cryogels doped with 1.25 – 5 wt% graphene oxide (GO). Incorporation of GO resulted in multifaceted modification in the textural and chemical properties of the carbon cryogel. The thermal decomposition of GO facilitated the formation of micropores resulted in a substantial increase in the apparent surface area (up to 1780 m2/g). The annealing at 1000 °C removed part of the heteroatoms but left behind a high number of defects. While the volatile thermal degradation products of GO affected the porous texture and the surface chemistry in a complex way, its reduced residue resulted in a gradually increasing electrical conductivity. The influence of GO was studied in oxygen reduction reaction (ORR) and in Li-ion storage application. GO affected the electron transfer mechanism in the ORR tests and challenged the stability of the electrodes. Even if the electrode has been stabilized under oxygen-free conditions, later may undergo destabilization processes during the ORR. The 5 wt% GO doped sample was the most sensitive under oxidative conditions, but finally it exhibited the highest capacitance. In the Li-ion battery tests the coulombic efficiency of all the samples was consistently above 98 %, indicating the great potential of such carbons for efficient Li-ion insertion and reinsertion during the charge – discharge process, thereby providing a promising alternative for graphite-based anodes. The cell from the 1.25% sample showed an initial discharge capacity of 313 mAh/g, 95.1 % capacity retention and 99.3 % coulombic efficiency after 50 charge – discharge cycles.

Keywords

: biomass; porous texture; surface chemistry; oxygen reduction reaction; lithium-ion battery

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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