Sodium borohydride treatment: a simple and effective process for the removal of stabilizer and capping agents from shape-controlled palladium nanoparticles

Nalajala, Naresh; Saleha, Wasim F.G.; Ladewig, Bradley P.; Neergat, Manoj

doi:10.1039/c4cc02747g

Cited by 40 publications

(35 citation statements)

References 18 publications

(22 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The compounds used in the synthesis of Pd nanoparticles can also decrease the ORR activity and thus the removal of these supplements is very important [83,84]. Frequently heattreatment or thorough washing and centrifugation are used for cleaning, but chemical approach can also be employed.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Recent progress in oxygen reduction electrocatalysis on Pd-based catalysts

Erikson

Sarapuu

Solla-Gullón

et al. 2016

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Palladium-based catalysts for electrochemical reduction of oxygen have received increasing attention as potential replacement for platinum-based materials in the fuel cells. This Review summarises the research conducted with nanostructured palladium catalysts, including thin nanostructured films and Pd nanoparticles on various carbon and non-carbon supports. The mechanism of oxygen reduction on palladium is described and the effect of the particle size and shape on the electrocatalytic activity is emphasised. The role of the support material and additives on the oxygen reduction activity of Pd nanoparticles is also discussed. The electrocatalytic activity of Pd-based catalysts is evaluated in terms of specific activity and mass activity. The application of supported Pd nanoparticles as cathode catalysts for lowtemperature fuel cells is highlighted. Some insights into the remaining challenges and directions for further development of Pd-based oxygen reduction electrocatalysts are provided.

show abstract

Section: Accepted Manuscriptmentioning

confidence: 99%

Recent progress in oxygen reduction electrocatalysis on Pd-based catalysts

Erikson

Sarapuu

Solla-Gullón

et al. 2016

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

show abstract

“…Neergat and co-workers reported two different alternatives for the removal of stabilizers and capping agents with shape-controlled Pd nanoparticles prepared in the presence of PVP and others additives such as Br -, Cl -and citrate ions [47,48]. In the first On the other hand, for shape-controlled Au nanoparticles, it has been stated that the electrochemical deposition of a film of PbO 2 in alkaline solution [51,52] is very effective in order to remove different capping agents, including polyethylene glycol dodecyl ether (Brij ® 30), CTAB and poly(diallyldimethylammonium chloride) (PDDA)).…”

Section: Surface Cleaning Methodologiesmentioning

confidence: 99%

Electrocatalysis on shape-controlled metal nanoparticles: Progress in surface cleaning methodologies

Montiel

Vidal‐Iglesias

Montiel

et al. 2017

Current Opinion in Electrochemistry

View full text Add to dashboard Cite

The use of shape-controlled metal nanoparticles has produced not only a clear enhancement in the electrocatalytic activity of different reactions of interest but also a better understanding of the effect of the surface structure on nanoscaled materials. However, it is well-accepted that a correct understanding of the correlations between shape/surface structure and electrochemical reactivity indispensably requires the use of clean surfaces. In this regard, and considering that most of the synthetic methodologies available in the literature for the preparation of these shaped metal nanoparticles employ capping agents, the development of effective surface cleaning methodologies able to remove such capping agents from the surface of the corresponding nanoparticles, becomes an extremely important prerequisite to subsequently evaluate their electrocatalytic properties for any reaction of interest.Consequently, in this contribution, we summarize the most relevant advances about surface cleaning procedures applied to different shaped metal nanoparticles for electrocatalytic purposes. It is worth mentioning that this work will only include contributions in which the surface cleanness of the samples is specifically evaluated using well-established electrochemical tools.

show abstract

“…(I) The growth on seeds surface along [100] is highly selective and almost no significant growth along other directions occurs (Fig. 50,51 However, subsequent materials applications are affected and must involve the removal of halide ion. For this reason, small sized byproducts decrease greatly and thereby product quality is highly improved (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1B1-1B2). 51 Therefore, developing I --and Br --ion-free synthetic technology for noble nanostructure control is also highly deserved. 1B3-1B4).…”

Section: Introductionmentioning

confidence: 99%

The alloying effect and AgCl-directing growth for synthesizing a trimetallic nanoring with improved SERS

Han

Zhou

et al. 2015

Nanoscale

View full text Add to dashboard Cite

We report the synthesis of high quality trimetallic Au/Ag/Pt nanorings (TAAPNs) by using Au/Ag alloy decahedra (AAAD) as templates. The alloying effect and AgCl-directing growth have been investigated in detail during the formation of TAAPN. It was found that the doping of Ag in AAAD changes the surrounding environment of Au atoms and decreases the oxidization reduction potential (ORP) of [AuCl(2)](-)/Au because of the alloying effect, resulting in the dissolved O(2) molecules that serve as an effective etchant for oxidizing Au to Au(I). Ascorbic acid (AA) and chloroplatinic acid (H(2)PtCl(6)) are weak acids which can accelerate the etching by increasing the concentration of H(+). The AgCl selectively absorbs on {100} of the decahedra and induces the preferential deposition of H(2)PtCl(6) here via their complexing interaction. AA reduces Pt(IV) and Ag(I) to atoms which grow on {100} facets. The formed Pt/Ag layer changes the etching direction from along [100] to [111] and generates the TAAPN. Besides, it has been noted that the TAAPNs exhibit good Surface Enhanced Raman Scattering (SERS) performance.

show abstract

Sodium borohydride treatment: a simple and effective process for the removal of stabilizer and capping agents from shape-controlled palladium nanoparticles

Cited by 40 publications

References 18 publications

Recent progress in oxygen reduction electrocatalysis on Pd-based catalysts

Recent progress in oxygen reduction electrocatalysis on Pd-based catalysts

Electrocatalysis on shape-controlled metal nanoparticles: Progress in surface cleaning methodologies

The alloying effect and AgCl-directing growth for synthesizing a trimetallic nanoring with improved SERS

Contact Info

Product

Resources

About