Template- and Surfactant-free room temperature synthesis of Pt/C and Pt−Rh/C nanowires/nanoparticles for ethanol electro-oxidation
Template- and Surfactant-free room temperature synthesis of Pt/C and Pt−Rh/C nanowires/nanoparticles for ethanol electro-oxidation
The synthesis of Pt−Rh alloy nanowires (NWs) using straightforward methodologies remains a challenge. Here, carbon-supported Pt and Pt−Rh nanowire catalysts were synthesised by chemical reduction at room temperature, without using surfactants or templates. The method of synthesis used yielded Pt/C NWs and a mixture of nanowires with some nanoparticles for the Pt−Rh/C catalysts (characterised using XRD, TEM, EDX, XPS, and XAS). The nanoparticles form due to differences in the surface energy and atomic radius between Pt and Rh. The binary NWs are found to be more active towards ethanol oxidation than the commercial Pt/C reference catalyst. Additionally, the Pt−Rh/C NW catalyst displays a specific activity 2.5-fold higher than the Pt/C NWs and Pt/C reference catalysts after 15 min of chronoamperometric tests (at 0.5 V vs RHE). Thus, the synthesised carbon-supported Pt NWs and Pt−Rh nanowires-nanoparticles are promising alternatives for direct ethanol fuel cell anodes.
binary catalysts, electroactivity, ethanol, nanowires, oxidation
Neto, Edmundo S.Valério
6061b369-9d2d-43e6-b6f5-3956ea4316f0
Almeida, Caio V.S.
718ae32a-23a1-4a8d-8248-a66d6f96f5fc
Huang, Haoliang
132a8eda-b800-4fa7-9583-6b4306f30247
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Eguiluz, Katlin I.B.
59d40318-d101-44e0-b00c-b8f30aa1baf4
Salazar-Banda, Giancarlo R.
80800367-cb82-42ad-8137-83e98dbf4ecb
22 June 2023
Neto, Edmundo S.Valério
6061b369-9d2d-43e6-b6f5-3956ea4316f0
Almeida, Caio V.S.
718ae32a-23a1-4a8d-8248-a66d6f96f5fc
Huang, Haoliang
132a8eda-b800-4fa7-9583-6b4306f30247
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Eguiluz, Katlin I.B.
59d40318-d101-44e0-b00c-b8f30aa1baf4
Salazar-Banda, Giancarlo R.
80800367-cb82-42ad-8137-83e98dbf4ecb
Neto, Edmundo S.Valério, Almeida, Caio V.S., Huang, Haoliang, Russell, Andrea E., Eguiluz, Katlin I.B. and Salazar-Banda, Giancarlo R.
(2023)
Template- and Surfactant-free room temperature synthesis of Pt/C and Pt−Rh/C nanowires/nanoparticles for ethanol electro-oxidation.
ChemCatChem, 15 (12), [e202300048].
(doi:10.1002/cctc.202300048).
Abstract
The synthesis of Pt−Rh alloy nanowires (NWs) using straightforward methodologies remains a challenge. Here, carbon-supported Pt and Pt−Rh nanowire catalysts were synthesised by chemical reduction at room temperature, without using surfactants or templates. The method of synthesis used yielded Pt/C NWs and a mixture of nanowires with some nanoparticles for the Pt−Rh/C catalysts (characterised using XRD, TEM, EDX, XPS, and XAS). The nanoparticles form due to differences in the surface energy and atomic radius between Pt and Rh. The binary NWs are found to be more active towards ethanol oxidation than the commercial Pt/C reference catalyst. Additionally, the Pt−Rh/C NW catalyst displays a specific activity 2.5-fold higher than the Pt/C NWs and Pt/C reference catalysts after 15 min of chronoamperometric tests (at 0.5 V vs RHE). Thus, the synthesised carbon-supported Pt NWs and Pt−Rh nanowires-nanoparticles are promising alternatives for direct ethanol fuel cell anodes.
Text
202300048
- Accepted Manuscript
More information
Accepted/In Press date: 23 April 2023
e-pub ahead of print date: 19 May 2023
Published date: 22 June 2023
Additional Information:
Funding Information:
The authors want to thank CNPq (grants: 305438/2018-2, 311856/2019-5, 407274/2013-8, 400443/2013-9, and 474261/2013-1) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES (grant: 88881.121097/2016-01) Brazil, The Royal Society and the Newton Fund (NMG\R1\180416 - Newton Mobility Grants 2018 Round 1) for financial support and scholarships. We thank Diamond Light Source for instrument access on B18 (SP15151-8 and SP15151-9) and the station scientist Veronica Celorrio for her assistance. We also thank Prof. Ronaldo Santos Silva, and Nikolay Zhelev from the Federal University of Sergipe and the University of Southampton for experimental support in TEM measurements and Prof. Cláudio Radtke from the Federal University of Rio Grande do Sul for their contribution to XPS data acquisition.
Funding Information:
The authors want to thank CNPq (grants: 305438/2018‐2, 311856/2019‐5, 407274/2013‐8, 400443/2013‐9, and 474261/2013‐1) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES (grant: 88881.121097/2016‐01) Brazil, The Royal Society and the Newton Fund (NMG\R1\180416 ‐ Newton Mobility Grants 2018 Round 1) for financial support and scholarships. We thank Diamond Light Source for instrument access on B18 (SP15151‐8 and SP15151‐9) and the station scientist Veronica Celorrio for her assistance. We also thank Prof. Ronaldo Santos Silva, and Nikolay Zhelev from the Federal University of Sergipe and the University of Southampton for experimental support in TEM measurements and Prof. Cláudio Radtke from the Federal University of Rio Grande do Sul for their contribution to XPS data acquisition.
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
Keywords:
binary catalysts, electroactivity, ethanol, nanowires, oxidation
Identifiers
Local EPrints ID: 478277
URI: http://eprints.soton.ac.uk/id/eprint/478277
ISSN: 1867-3880
PURE UUID: fe95a06d-77e1-4487-bff7-bce9ad705d53
Catalogue record
Date deposited: 27 Jun 2023 16:57
Last modified: 23 Apr 2024 04:01
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Contributors
Author:
Edmundo S.Valério Neto
Author:
Caio V.S. Almeida
Author:
Haoliang Huang
Author:
Katlin I.B. Eguiluz
Author:
Giancarlo R. Salazar-Banda
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