In situ ion exchange preparation of Pt/carbon nanotubes electrode: Effect of two-step oxidation of carbon nanotubes
Multi-walled carbon nanotubes (MWNTs) supported Pt electrode is prepared by in-situ ion exchange method. X-ray photoelectron spectroscopy (XPS) confirms that compared with the only electrochemical oxidation or chemical oxidation treatment, more carboxylic acid groups are produced on the surface of MWNTs treated by dual-oxidation, which involves both electrochemical oxidation and chemical oxidation. Transmission electron microscopy (TEM) shows that Pt nanoparticles deposited via in-situ ion exchange are highly dispersed on the MWNTs surface. Electrochemical measurements show that the resultant Pt/MWNTs electrode treated by dual-oxidation exhibits the largest electrochemical surface area and the highest activity for oxygen reduction reaction (ORR) among the investigated electrodes. This can be attributed to the fact that dual-oxidation treatment produces more carboxylic acid groups at the electroactive sites on MWNTs surface, which results in loading more Pt nanoparticles in the following ion exchange process.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1030477
- Report Number(s):
- PNNL-SA-82508; JPSODZ; TRN: US201124%%238
- Journal Information:
- Journal of Power Sources, Vol. 196, Issue 23; ISSN 0378-7753
- Country of Publication:
- United States
- Language:
- English
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