Ag−Pt Nanoplates: Galvanic Displacement Preparation and Their Applications As Electrocatalysts

Lee, Chien‐Liang; Tseng, Chun-Ming

doi:10.1021/jp8058504

Cited by 64 publications

(49 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Miao and co‐workers have shown Pt/Pd bimetallic nanoparticles on multiwall carbon nantotubes for better hydrogen evolution . Lee and co‐workers synthesized a shape dependent (circular, hexagonal and triangular) Ag−Pt via galvanic exchange method for hydrogen evolution; the as‐synthesized Ag−Pt triangular nanoplates have the high efficiency …”

Section: Introductionsupporting

confidence: 89%

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

2019

View full text Add to dashboard Cite

2D nanosheets of different metal chalcogenides have attracted potential interest due to their appealing physical and chemical properties. In this present study we have developed a novel approach for the synthesis of 2D sheets of MoS 2 following a simple hydrothermal method. Using a simple wet-chemical route, surface of 2D sheets of MoS 2 are modified with AgPd alloy nanoparticles following galvanic exchange technique. Electrocatalytic activity towards hydrogen evolution reaction (HER) of MoS 2 , MoS 2 /Ag, and AgPd alloy was checked in a wide range of pH condition. In 0.5 M H 2 SO 4 , bare MoS 2 nanosheets can generate 10 mA/cm 2 current density upon application of only À 0.329 V vs. reversible hydrogen electrode (RHE). After successful decoration of Ag nanoparticle, MoS 2 /Ag shows improved activity compared to bare MoS 2 sheets. MoS 2 /Ag can generate current density 10 mA/cm 2 only by applying À 0.299 V vs. RHE. Further MoS 2 /AgPd-1 can generate 10 mA/cm 2 current density upon application of À 0.229 V vs. RHE. So, from the result it is clear that the successive inclusion of Pd in place of Ag results in higher electrocatalytic activity. Again, MoS 2 /AgPd-2 can generate 10 mA/cm 2 current density upon application of only À 0.215 V vs. RHE. All the metal and alloy nanoparticle decorated MoS 2 show excellent stability in hydrogen evolution reaction. MoS 2 , MoS 2 /AgPd-1 and MoS 2 /AgPd-2 can generate unaltered current density up to 30 h.[a] M.

show abstract

Section: Introductionsupporting

confidence: 89%

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

2019

View full text Add to dashboard Cite

show abstract

“…The idea of a galvanic replacement reaction fashioned by speciation was further investigated by using

{PdCl}_{4}^{2 -}

and

{PtCl}_{4}^{2 -}

precursors. Although the galvanic replacement reaction between Ag templates and Pd or Pt precursors has been widely studied, the synthesis of hollow nanoparticles with continuous and smooth walls is challenging compared to Au. For Ag−Pt, the main limitation reported in the control of the final particle morphology is attributed to the poor miscibility between Ag and Pt due to lattice mismatch and the stronger bonding energy of Pt−Pt compared to that of Pt−Ag; favoring the formation of Pt island growth pattern rather than alloying.…”

Section: Metal Speciation and Galvanic Replacementmentioning

confidence: 99%

Enhancing Galvanic Replacement in Plasmonic Hollow Nanoparticles: Understanding the Role of the Speciation of Metal Ion Precursors

Richard‐Daniel

Boudreau

2020

ChemNanoMat

View full text Add to dashboard Cite

Hollow nanostructures offer great potential for plasmonic applications due to their strong and highly tunable localized surface plasmon resonance. The relationship between the plasmonic properties and geometry of hollow nanoparticles, such as core‐shell size ratio, concentricity of the cavity and porosity of the wall, is well documented. Nanoscale galvanic replacement provides a simple, versatile and powerful route for the preparation of such hollow structures. Here we demonstrate how the efficiency of reductant‐assisted galvanic replacement processes can be enhanced by controlling the degree of hydration and hydrolysis of the metal ion precursor using pH and pL as key control parameters (by analogy to pH, the letter p in the expression pL is used to indicate the decimal cologarithm associated with the concentration of the ligand L). Adjusting precursor speciation prior to the sacrificial template's hollowing process offers a new strategy to tune the morphology and optical properties of plasmonic hollow nanostructures.

show abstract

“…It is likely that in addition to ED of Pt, galvanic displacement (GD) of Co 0 by Pt also occurred. For GD to occur, there must be a favorable redox potential for the oxidation of the primary metal from the base catalyst (Co 0 , in this case) and the reduction of the secondary metal ion from the precursor (Pt 4+ ) [33][34][35][36]. Calculation of the cell potential for the oxidation of Co 0 to form Co 2+ and the reduction of PtCl 6 2´t o form Pt 0 + 6Cl´, shown in Equation (1), gives a net potential of 2.038 V [37].…”

Section: Bimetallic Pt-co/c Catalysts From Electroless Deposition Expmentioning

confidence: 99%

Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation

et al. 2016

View full text Add to dashboard Cite

Carbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modified charge enhanced dry impregnation. X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM) characterization of the base catalyst showed highly dispersed particles. A basic ED bath containing PtCl 6 2´a s the Pt precursor, dimethylamine borane as reducing agent, and ethylenediamine as stabilizing agent successfully targeted deposition of Pt on Co particles. Simultaneous action of galvanic displacement and ED resulted in Pt-Co alloy formation observed in XRD and energy dispersive X-ray spectroscopy (XEDS) mapping. In addition, fast deposition kinetics resulted in hollow shell Pt-Co alloy particles while particles with Pt-rich shell and Co-rich cores formed with controlled Pt deposition. Electrochemical evaluation of the Pt-Co/C catalysts showed lower active surface but much higher mass and surface activities for oxygen reduction reaction compared to a commercial Pt/C fuel cell catalyst.

show abstract

Ag−Pt Nanoplates: Galvanic Displacement Preparation and Their Applications As Electrocatalysts

Cited by 64 publications

References 17 publications

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

Enhancing Galvanic Replacement in Plasmonic Hollow Nanoparticles: Understanding the Role of the Speciation of Metal Ion Precursors

Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation

Contact Info

Product

Resources

About

Ag−Pt Nanoplates: Galvanic Displacement Preparation and Their Applications As Electrocatalysts

Cited by 64 publications

References 17 publications

AgPd Alloy Nanoparticles Decorated MoS2 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

AgPd Alloy Nanoparticles Decorated MoS2 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

Enhancing Galvanic Replacement in Plasmonic Hollow Nanoparticles: Understanding the Role of the Speciation of Metal Ion Precursors

Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation

Contact Info

Product

Resources

About

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition