Particle size and crystallographic orientation controlled electrodeposition of platinum nanoparticles on carbon nanotubes

Sharma, Raghunandan; Kar, Kamal K.

doi:10.1016/j.electacta.2015.01.046

Cited by 31 publications

(20 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…43,44 The amount of Pt loaded on the Pt-CNTCF modified working electrode was 43,44 The amount of Pt loaded on the Pt-CNTCF modified working electrode was …”

Section: Synthesis Of Pt-cntcfmentioning

confidence: 99%

“…Low ESA for ted of 5 min may be attributed to the lower Pt-loading, at which large fraction of the Pt-nanoparticles may remain obscured by the CNTs, when the CNT dispersion is drop-casted on the electrode. 43,48 The parameter VOnset is estimated from the intersection point of the tangents to the LSV curve in the proximity of ORR peak, while | | is taken as the current density at a potential of -0.3 V. Variation of | | shown in Fig. The maximum value of the ESA is observed to be ~82 m 2 g -1 for ted of 25 min.…”

Section: Rsc Advances Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Hierarchically structured catalyst layer for the oxygen reduction reaction fabricated by electrodeposition of platinum on carbon nanotube coated carbon fiber

Sharma

Kar

2015

RSC Adv.

Self Cite

View full text Add to dashboard Cite

Cost-efficient fabrication of cathode catalyst layer having low Pt-loading and high oxygen reduction reaction (ORR) performance is of prime importance towards commercialization of low temperature fuel cells. Here, an attempt has been made to fabricate hierarchically structured and cathode catalyst layer consisting of Pt-nanoparticle clusters supported on defective carbon nanotube (CNT) coated carbon fiber (CNTCF). CNTs are grown on carbon fiber (CF) by chemical vapor deposition (CVD), while electrodeposition is employed to deposit Pt-nanoparticle clusters on the CNTCF. Effect of Pt-loading on oxygen reduction reaction (ORR) performance of the Ptcoated CNTCF (Pt-CNTCF) electrocatalysts is studied by varying the electrodeposition time (ted) between 5 and 30 min, which results a variation of Pt weight fraction in Pt-CNTCF from almost zero to ~0.3. Linear sweep voltammetry using the Pt-CNTCF modified glassy carbon (GC) rotating disc electrode (RDE) is employed to study the ORR performance of the samples. The CNTCF support, owing to the defective structure of CNT, itself exhibits significant ORR activity with an electron transfer number (n) of ~2.6, which leads to a synergistic enhancement of the overall electrocatalytic performance of Pt-CNTCF. For lower Pt-loading on GC (~5 μg cm -2 ), the contribution of CNTCF support dominates, while the Pt-nanoclusters govern the ORR 2 performance at higher Pt-loading ((>10 μg cm -2 ), with n>3.5. Hence, a very low Pt-loading (~5 μg cm -2 ) may not be suitable for polymer electrolyte membrane fuel cells as production of substantial amounts of H2O2 on the catalyst supports may accelerate the membrane degradation.

show abstract

“…43,44 The amount of Pt loaded on the Pt-CNTCF modified working electrode was 43,44 The amount of Pt loaded on the Pt-CNTCF modified working electrode was …”

Section: Synthesis Of Pt-cntcfmentioning

confidence: 99%

Section: Rsc Advances Accepted Manuscriptmentioning

confidence: 99%

Hierarchically structured catalyst layer for the oxygen reduction reaction fabricated by electrodeposition of platinum on carbon nanotube coated carbon fiber

Sharma

Kar

2015

RSC Adv.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In terms of green chemistry, functionalizing Pt catalysts for selective alcohol oxidation in the existence of atmospheric oxygen is of great interest. A less expensive and environmentally friendly Pt/C synthesis route is favored for the commercial production of catalysts, and parameters like the size, surface morphology and dispersion status of Pt nanoparticles significantly affect the catalytic efficiency of the Pt/C catalysts [24][25][26][27] .…”

mentioning

confidence: 99%

Oxidation of Benzyl Alcohol Compounds in the Presence of Carbon Hybrid Supported Platinum Nanoparticles (Pt@CHs) in Oxygen Atmosphere

Göksu

Burhan

Mustafov

et al. 2020

Sci Rep

View full text Add to dashboard Cite

A novel catalyst which carbon hybrid supported platinum nanoparticles were synthesized by our group for the oxidation of benzyl alcohol derivatives. In this study, this catalyst was utilized for the oxidation of benzyl alcohol derivatives to benzaldehyde compounds in aqueous toluene at 80 °C. The benzaldehyde derivatives were synthesized in high yields and mild conditions in the presence of the catalyst by the developed method. Additionally, the prepared nanoparticles have been characterized by Transmission Electron Microscopy (TEM), the high-resolution electron micrograph (HR-TEM), X-ray Photoelectron Spectroscopy (XPS), and X-ray Diffraction (XRD). The mean particle size of the nanoparticles determined by the XRD technique was found to be 2.83 nm in parallel with TEM analysis. TEM analysis also indicated that the Pt nanoparticles were evenly dispersed on the support material. Finally, the Pt@CHs catalyst was shown also stable and reusable for the oxidation reaction, providing ≤95% conversion after its 3rd consecutive use in the oxidation reaction of various compounds.

show abstract

“…Colloidal syntheses involving polyol stabilizing agents, with subsequent removal of the ligands and reduction of the metal, are able to synthesize somewhat smaller Pt nanoparticles (1.7-4 nm) [17][18][19][20]. A host of other methods including as simple as incipient wetness and as complicated as radio frequency magnetron sputtering, have also yielded nanoparticles in the range of 2-5 nm [21][22][23][24][25][26][27], with the smallest stemming from electrodeposition (1.5 nm) [26], and atomic layer deposition (2 nm) [22]. With the exception of incipient wetness [23] (which yields 4.9 nm particles) these methods are somewhat complex and involve an abundance of chemical ingredients.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic Adsorption of Platinum onto Carbon Nanotubes and Nanofibers for Nanoparticle Synthesis

Banerjee

Contreras-Mora

McQuiston

et al. 2018

View full text Add to dashboard Cite

Strong Electrostatic Adsorption (SEA) has been demonstrated as a simple, scientific method to prepare well dispersed Pt nanoparticles over typical forms of carbon: activated, black, and graphitic carbons. Many varieties of specialty carbons have been invented in the last few decades including multi-walled nanotubes, nanofibers, graphene nanoplatelets, etc. In this work, we explore whether SEA can be applied to these specialty carbons for the synthesis of Pt nanoparticles. Over a number of oxidized and unoxidized multiwalled nanotubes and nanofibers, the point of zero charge (PZC) was measured and the uptake of anionic Pt complexes (Pt hexachloride, [PtCl 6 ] 2− , and cationic Pt complexes (platinum tetraammine, [Pt(NH 3 ) 4 ] 2+ ) as functions of final pH were surveyed. Pt nanoparticles on the various supports were synthesized at the optimal pH and were characterized by x-ray diffraction (XRD) and scanning transmission electron microscopy (STEM). The specialty carbons displayed volcano-shaped uptake curves typical of electrostatic adsorption for both Pt anions at low pH and Pt cations at high pH. However, the regimes of uptake often did not correspond to the measured PZC, probably due to surface impurities from the carbon manufacturing process. This renders the measured PZC of these specialty carbons unreliable for predicting anion and cation uptake. On the other hand, the anion and cation uptake curves provide an "effective" PZC and do indicate the optimal pH for the synthesis of ultrasmall nanoparticle synthesis. High resolution STEM imaging also showed that with SEA it is possible to disperse nanoparticles on the surface as well as the inner walls of the specialty carbons.

show abstract

Particle size and crystallographic orientation controlled electrodeposition of platinum nanoparticles on carbon nanotubes

Cited by 31 publications

References 25 publications

Hierarchically structured catalyst layer for the oxygen reduction reaction fabricated by electrodeposition of platinum on carbon nanotube coated carbon fiber

Hierarchically structured catalyst layer for the oxygen reduction reaction fabricated by electrodeposition of platinum on carbon nanotube coated carbon fiber

Oxidation of Benzyl Alcohol Compounds in the Presence of Carbon Hybrid Supported Platinum Nanoparticles (Pt@CHs) in Oxygen Atmosphere

Electrostatic Adsorption of Platinum onto Carbon Nanotubes and Nanofibers for Nanoparticle Synthesis

Contact Info

Product

Resources

About