Halloysite-derived nitrogen doped carbon electrocatalysts for anion exchange membrane fuel cells

Lu, Yaxiang, Wang, Lianqin, Preuß, Kathrin, Qiao, Mo, Titirici, Maria-Magdalena, Varcoe, John and Cai, Qiong (2017) Halloysite-derived nitrogen doped carbon electrocatalysts for anion exchange membrane fuel cells Journal of Power Sources, 372. pp. 82-90.

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Abstract

Developing the low-cost, highly active carbonaceous materials for oxygen reduction reaction (ORR) catalysts has been a high-priority research direction for durable fuel cells. In this paper, two novel N-doped carbonaceous materials with flaky and rod-like morphology using the natural halloysite as template are obtained from urea nitrogen source as well as glucose (denoted as GU) and furfural (denoted as FU) carbon precursors, respectively, which can be directly applied as metal-free electrocatalysts for ORR in alkaline electrolyte. Importantly, compared with a benchmark Pt/C (20wt%) catalyst, the as-prepared carbon catalysts demonstrate higher retention in diffusion limiting current density (after 3000 cycles) and enhanced methanol tolerances with only 50-60mV negative shift in half-wave potentials. In addition, electrocatalytic activity, durability and methanol tolerant capability of the two N-doped carbon catalysts are systematically evaluated, and the underneath reasons of the outperformance of rod-like catalysts over the flaky are revealed. At last, the produced carbonaceous catalysts are also used as cathodes in the single cell H2/O2 anion exchange membrane fuel cell (AEMFC), in which the rod-like FU delivers a peak power density as high as 703 mW cm−2 (vs. 1106 mW cm−2 with a Pt/C benchmark cathode catalyst).

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :	Name Email ORCID Lu, Yaxiang y.lu@surrey.ac.uk Wang, Lianqin lianqin.wang@surrey.ac.uk Preuß, Kathrin Qiao, Mo Titirici, Maria-Magdalena Varcoe, John J.Varcoe@surrey.ac.uk Cai, Qiong q.cai@surrey.ac.uk
Date :	31 December 2017
Funders :	Engineering and Physical Sciences Research Council (EPSRC)
DOI :	10.1016/j.jpowsour.2017.10.037
Grant Title :	H2FC SUPERGEN hub project
Copyright Disclaimer :	© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Uncontrolled Keywords :	Halloysite template; Nitrogen doping; Carbonaceous catalyst; Oxygen reduction reaction (ORR); Anion exchange membrane fuel cells (AEMFCs)
Additional Information :	Supplementary data related to this article can be found at http://dx. doi.org/10.1016/j.jpowsour.2017.10.037.
Depositing User :	Clive Harris
Date Deposited :	10 Nov 2017 14:11
Last Modified :	11 Dec 2018 11:23
URI:	http://epubs.surrey.ac.uk/id/eprint/844883

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