Bimetallic core-shell Ag@Pt nanoparticle-decorated MWNT electrodes for amperometric H-2 sensors and direct methanol fuel cells
- Authors
- Rashid, Muhammad; Jun, Tae-Sun; Jung, Yongju; Kim, Yong Shin
- Issue Date
- Mar-2015
- Publisher
- Elsevier BV
- Keywords
- Ag@Pt-MWNT electrode; Galvanic replacement reaction; Amperometric H-2 sensor; Direct methanol fuel cell
- Citation
- Sensors and Actuators, B: Chemical, v.208, pp.7 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors and Actuators, B: Chemical
- Volume
- 208
- Start Page
- 7
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/18799
- DOI
- 10.1016/j.snb.2014.11.005
- ISSN
- 0925-4005
- Abstract
- Bimetallic core-shell Ag@Pt nanoparticles (NPs) attached on multiwall carbon nanotube (Ag@Pt-MWNT) were synthesized via the formation of Ag NPs on a MWNT surface through chemical reduction and subsequent galvanic replacement of Ag with PtCl62-. The successful synthesis of Ag@Pt-MWNT was confirmed by probing chemical compositions, absorption, and microstructures using various material analysis methods (UV-vis, SEM, EDS, and TEM). The bimetallic particles were found to have a core-shell structure in the TEM image: an Ag core with an average size of approximately 7 nm was enclosed by a shell composedof small Pt NPs. The electrochemical surface area of the Ag@Pt-MWNT-modified glassy carbon electrode was 896 cm(2)/mg, which was 1.5 times higher than that of commercial 20 wt% Pt-C (E-Tek). The Ag@Pt-MWNTs electrode also exhibited a higher peak current for methanol oxidation than those of comparable Pt-MWNT and Pt-C under the same amount of Pt loading, thus providing evidence for its higher electro-catalytic activity and CO tolerance. Furthermore, an amperometric gas-sensing electrode was fabricated by filtering an Ag@Pt-MWNT solution on a porous PTFE sheet. The as-fabricated electrode displayed a high sensitivity of 1.1 mu A/ppm in H-2 detection and an excellent linear response over the wide concentration range of 5-1000 ppm, together with fairly good detection times and long-term stability. This enhanced performance was correlated and discussed to be a result of the unique nanostructural features of the Ag@Pt core-shell structure with a porous Pt layer and the strong anchoring of the bimetallic NPs on the activated MWNT surface, which provides a highly active surface area and effective interactions between Ag and Pt. (C) 2014 Elsevier B.V. All rights reserved.
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