Synthesis and characterization of methanol tolerant Pt/TiOx/C nanocomposites for oxygen reduction in direct methanol fuel Cells

Xiong, Liufeng; Manthiram, Arumugam

doi:10.1016/j.electacta.2004.04.011

Cited by 179 publications

(122 citation statements)

References 22 publications

Supporting

Mentioning

119

Contrasting

Order By: Relevance

“…In general, higher surface areas were obtained with TiO 2 over the course of 1000 cycles, which is consistent with literature reports on TiO 2 modified carbon nanoparticle supports [21]. This behavior can be rationalized by assuming an improved surface wetting [27] or the formation of additional active sites at the Pt/TiO 2 interface [28].…”

Section: Electrochemical Stability Assessmentsupporting

confidence: 90%

See 1 more Smart Citation

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

Bauer

Song

Ignaszak

et al. 2010

Electrochimica Acta

View full text Add to dashboard Cite

The electrochemical stability of Pt deposited on mesoporous carbon, which was either applied in its unmodified state or coated with 20 wt% TiO 2 , was investigated by cyclic voltammetry in N 2 purged 0.5 M sulfuric acid. XRD analysis revealed that TiO 2 was present in the anatase phase. The mean Pt particle diameter was ∼6 and ∼4 nm for mesoporous carbon with and without TiO 2 , respectively. Pt supported on TiO 2 modified substrates was more stable than Pt supported on conventional mesoporous carbon when subjected to 1000 cycles in the potential range from 0.05 to 1.25 V vs. RHE. This was evident from the observation that the support with TiO 2 retained ∼53% of the electrochemically active surface area relative to the state observed after 100 cycles, whereas ∼33% of the active area remained in the case without TiO 2 . The oxygen reduction mass activity was identical for both fresh samples (i.e., 18 A g −1 Pt). After 1000 cycles the mass activity decreased to 10 A g −1 Pt for the case without TiO 2 , whereas with TiO 2 the deactivation was minor; i.e., the mass activity after 1000 cycles was 17 A g .

show abstract

Section: Electrochemical Stability Assessmentsupporting

confidence: 90%

“…TiO 2 and carbon can be combined to form nano-composite catalyst supports [19][20][21][22]. Von Kraemer et al showed that such a modified support performed comparably to Pt/C in a PEM fuel cell [19].…”

Section: Introductionmentioning

confidence: 99%

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

Bauer

Song

Ignaszak

et al. 2010

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…High graphitic carbon materials, such as carbon nanotubes (CNT) and graphene oxides (GO) are widely used as supports for both precious and non-precious catalytic centers [104,171,177,[231][232][233][234][235][236][237][238][239][240][241] The high graphitic carbons are less corrosive than low graphitic carbon as shown in Figure 27a [164]. Taking CNT as an example, the Raman spectra show that the oxidized multi-walled CNT (ox.MWCNT) has dominant graphitic sp 2 domains, as compared to carbon (Vulcan XC-72) which shows highly disordered sp 3 domains, Figure 27b When a catalytic center, e.g., Pt, is chemically deposited onto highly graphitic carbon the interaction takes place with both sp 3 and sp 2 domains, Figure 28a,b, shows the close Pt particle size and morphology [201].…”

Section: High Graphitic Carbonmentioning

confidence: 99%

What Can We Learn in Electrocatalysis, from Nanoparticulated Precious and/or Non-Precious Catalytic Centers Interacting with Their Support?

2016

View full text Add to dashboard Cite

This review is devoted to discussing the state of the art in the relevant aspects of the synthesis of novel precious and non-precious electrocatalysts. It covers the production of Pt-and Pd-based electrocatalysts synthesized by the carbonyl chemical route, the synthesis description for the preparation of the most catalytically active transition metal chalcogenides, then the employment of free-surfactants synthesis routes to produce non-precious electrocatalysts. A compilation of the best precious electrocatalysts to perform the hydrogen oxidation reaction (HOR) is described; a section is devoted to the synthesis and electrocatalytic evaluation of non-precious materials which can be used to perform the HOR in alkaline medium. Apropos the oxygen reduction reaction (ORR), the synthesis and modification of the supports is also discussed as well, aiming at describing the state of the art to improve kinetics of low temperature fuel cell reactions via the hybridization process of the catalytic center with a variety of carbon-based, and ceramic-carbon supports. Last, but not least, the review covers the experimental half-cells results in a micro-fuel cell platform obtained in our laboratory, and by other workers, analyzing the history of the first micro-fuel cell systems and their tailoring throughout the time bestowing to the design and operating conditions.

show abstract

“…The solution was then ultrasonically mixed and placed inside the cylindrical reaction flask. The reducing agent (NaCOOH [4,20] or NaBH 4 ) was added dropwise to the solution in the heated reaction flask (90 ºC) either before or after the Pt salt in order to help determine its effects on activity. The reducing agent in solution was added in excess to account for deactivation during the dropwise addition After all the reducing agent was added, the suspension was stirred at the temperature for 20 hours to allow the colloidal Pt particles to adsorb on the support surface.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Effect of pretreatment on Pt–Co/C cathode catalysts for the oxygen reduction reaction

Fox

Colón-Mercado

2010

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

8035078560Carbon supported Pt and Pt-Co electrocatalysts for the oxygen reduction reaction in low temperature fuel cells were prepared by the reduction of the metal salts with sodium borohydride and sodium formate. The effect of surface treatment with nitric acid on the carbon surface and Co on the surface of carbon prior to the deposition of Pt was studied. The catalysts where Pt was deposited on treated carbon the ORR reaction preceded more through the two electron pathway and favored peroxide production, while the fresh carbon catalysts proceeded more through the four electron pathway to complete the oxygen reduction reaction. NaCOOH reduced Pt/C catalysts showed higher activity that NaBH 4 reduced Pt/C catalysts. It was determined that the Co addition has a higher impact on catalyst activity and active surface area when used with NaBH 4 as reducing agent as compared to NaCOOH.

show abstract

Synthesis and characterization of methanol tolerant Pt/TiOx/C nanocomposites for oxygen reduction in direct methanol fuel Cells

Cited by 179 publications

References 22 publications

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

What Can We Learn in Electrocatalysis, from Nanoparticulated Precious and/or Non-Precious Catalytic Centers Interacting with Their Support?

Effect of pretreatment on Pt–Co/C cathode catalysts for the oxygen reduction reaction

Contact Info

Product

Resources

About