ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Designing N-doped carbon nanotubes and Fe-Fe3C nanostructures co-embedded in B-doped mesoporous carbon as an enduring cathode electrocatalyst for metal-air batteries

Nandan, Ravi and Nanda, K K (2017) Designing N-doped carbon nanotubes and Fe-Fe3C nanostructures co-embedded in B-doped mesoporous carbon as an enduring cathode electrocatalyst for metal-air batteries. In: JOURNAL OF MATERIALS CHEMISTRY A, 5 (32). pp. 16843-16853.

[img] PDF
Jou_Mat_Che_5-32_16843_2017.pdf - Published Version
Restricted to Registered users only

Download (4MB) | Request a copy
Official URL: http://doi.org/10.1039/c7ta04597b

Abstract

Oxygen reduction and evolution reactions are of immense importance in electrochemical conversion/ storage devices like regenerative/alcohol/hydrogen based fuel cells and metal-air batteries. Here, a rational facile synthesis methodology has been developed to design N-doped carbon nanotubes (N-CNTs) and Fe-Fe3C nanostructures co-embedded in B-doped mesoporous carbon nanostructures (BFNCNTs) as a noble metal-free superior bi-functional electrocatalyst for oxygen evolution/reduction reactions. The incorporation of N and B with negligible/undetectable B-N formation and Fe-Fe3C nanostructures leads to the superior performance by introducing plenty of defects, local heterogeneity and a high specific surface area (similar to 272 m(2) g(-1)). Besides, mesoporous boron-doped carbon acts as a host material for NCNTs and Fe-Fe3C, and it offers good connectivity as well as a protective coating for durable catalysis. Remarkably, more positive onset (-30 mV) and half-wave potentials (-225 mV) with -94% current retention under accelerated stability test and fuel tolerance for the ORR, in combination with lower onset (422 mV) and E-j=10(OER) (562 mV) potentials with high current density (190 mA cm(-2) @ 0.8 V vs. Ag/AgCl) for the OER as compared to commercial state-of-the-art electrocatalysts suggest superior bifunctional behavior of BFNCNTs. The complete oxygen electrochemical activity Delta E = E-j(OER)=10 = E-1/2(ORR) = 0.788 V for BFNCNTs is lower than recently reported various state-of-the-art bifunctional catalysts. Besides, a prototype battery fabrication using BFNCNTs as the cathode electrode for driving a light emitting diode has been demonstrated. Overall, BFNCNTs have potential to serve as a non-precious electrocatalyst for electrochemical energy devices.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 09 Sep 2017 04:48
Last Modified: 09 Sep 2017 04:48
URI: http://eprints.iisc.ac.in/id/eprint/57748

Actions (login required)

View Item View Item