Effect of the pH of the preparation medium on the microstructure and electrocatalytic activity of carbon nanotubes decorated with PtSn nanoparticles for use in methanol oxidation
Source abstract
Abstract
Carbon nanotubes (CNTs) decorated with PtSn nanoparticles (PtSn/CNT) were prepared by the microwave-assisted ethylene glycol reduction method and characterized by atomic adsorption spectroscopy, X-ray diffraction and transmission electron microscopy. Results indicated that the loading efficiency of the metal catalyst, and the degree of alloying and morphology of the PtSn nanoparticles were significantly affected by the solution pH value of the metallic ions in the ethylene glycol. The required composition of the PtSn/CNT catalysts could be obtained by adjusting the pH value to about 5, which is almost the isoelectric point of the acid-treated CNTs. The size of the PtSn nanoparticles decreased with the pH value in the range 2 to 7, but they became large and agglomerated when the pH value was greater than 7. Electrocatalytic activity tests indicated that the PtSn/CNTs prepared at pH 5 had the best catalytic performance towards methanol oxidation. The improvement in catalytic activity was mainly attributed to a high loading efficiency and control of particle shape and size distribution.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
Show source-provided references
1. Direct oxidation alkaline fuel cells: from materials to systems [J]10.1039/C2EE02552C ↗
2. Direct ethanol fuel cells [J]10.1016/j.ijhydene.2012.07.059 ↗
3. How bimetallic electrocatalysts does work for reactions involved in fuel cells? Example of ethanol oxidation and comparison to methanol [J]10.1016/j.electacta.2005.01.051 ↗
4. Catalysts for direct ethanol fuel cells [J]10.1016/j.jpowsour.2007.04.009 ↗
5. Capping agent free synthesis of PtSn bimetallic nanoparticles with enhanced electrocatalytic activity and lifetime over methanol oxidation [J]10.1016/j.catcom.2007.06.017 ↗
6. Promising anode candidates for direct ethanol fuel cell: Carbon supported PtSn-based trimetallic catalysts prepared by Bönnemann method [J]10.1016/j.ijhydene.2013.03.058 ↗
7. Three dimensional N-doped graphene/PtRu nanoparticle hybrids as high performance anode for direct methanol fuel cells [J]10.1039/c3ta14809b ↗
8. Preparation and characterization of multi-walled carbon nanotube (MWCNTs)-supported Pt-Ru catalyst for methanol electrooxidation [J]10.1016/j.jallcom.2006.10.030 ↗
9. Fabrication and electrochemical activity of carbon nanotubes decorated with PtRu nanoparticles in acid solution [J]10.1016/j.jallcom.2007.11.014 ↗
10. Control of particle size of Pt and Pt alloy electrocatalysts supported on carbon black by the nanocapsule method [J]10.1021/am9008693 ↗
11. Anode catalysts for direct methanol fuel cells in acidic media: Do we have any alternative for Pt or Pt–Ru? [J]10.1021/cr400389f ↗
12. Preparation and characterization of Pt–Rare Earth/C electrocatalysts using an alcohol reduction process for methanol electro-oxidation [J]10.1016/j.jallcom.2008.08.073 ↗
13. Functionalization of carbon nanotubes by an effective intermittent microwave heating-assisted HF/H2O2 treatment for electrocatalyst support of fuel cells [J]10.1016/j.electacta.2009.07.009 ↗
14. Microwave heated polyol synthesis of carbon nanotubes supported Pt nanoparticles for methanol electrooxidation [J]10.1016/j.matchemphys.2004.11.003 ↗
15. Shape-controlled synthesis of colloidal Platinum nanoparticles [J]10.1126/science.272.5270.1924 ↗
16. Size-selected synthesis of PtRu nano-catalysts: Reaction and size control mechanism [J]10.1021/ja0495819 ↗
17. Microwave polyol synthesis of Pt/CNTs catalysts: Effects of pH on particle size and electrocatalytic activity for methanol electrooxidization [J]10.1016/j.carbon.2005.03.030 ↗
18. Assembly of metal nanoparticles on electrospun nylon 6 nanofibers by control of interfacial hydrogen-bonding interactions [J]10.1021/cm801077p ↗
19. Effects of annealing treatment and pH on preparation of citrate-stabilized PtRu/C catalyst [J]10.1016/j.jpowsour.2006.07.021 ↗
20. Performance of direct methanol fuel cell using carbon nanotube-supported Pt–Ru anode catalyst with controlled composition [J]10.1016/j.jpowsour.2006.01.057 ↗
21. Comparison of different promotion effect of PtRu/C and PtSn/C electrocatalysts for ethanol electro-oxidation [J]10.1016/j.electacta.2007.04.056 ↗
22. Platinum nanoparticles supported on activated carbon fiber as catalyst for methanol oxidation [J]
23. The role of carbon materials in heterogeneous catalysis [J]10.1016/S0008-6223(97)00173-5 ↗
24. In Chemistry and Physics of Carbon [M]
25. Platinum deposition on carbon nanotubes via chemical modification [J]10.1021/cm970364z ↗
26. Evidence for the protonation of basal plane sites on carbon [J]10.1016/0008-6223(92)90164-R ↗
27. Controlled platinum nanoparticles uniformly dispersed on nitrogen-doped carbon nanotubes for methanol oxidation [J]10.1016/j.diamond.2008.01.116 ↗
28. Modified carbon nanotubes: An effective way to selective attachment of gold nanoparticles [J]10.1016/S0008-6223(03)00339-7 ↗
29. Electro-oxidation of methanol and ethanol using PtRu/C, PtSn/C and PtSnRu/C electrocatalysts prepared by an alcohol-reduction process [J]10.1016/j.jpowsour.2006.12.088 ↗