scholarly journals PT-BI Co-Deposit Shell on AU Nanoparticle Core: High Performance and Long Durability for Formic Acid Oxidation

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1049
Author(s):  
Young Jun Kim ◽  
Hyein Lee ◽  
Hee-Suk Chung ◽  
Youngku Sohn ◽  
Choong Kyun Rhee
Keyword(s):  
Formic Acid ◽  
High Performance ◽  
Hydrogen Adsorption ◽  
Precursor Solution ◽  
Formic Acid Oxidation ◽  
Au Nanoparticle ◽  
Acid Oxidation ◽  
Irreversible Adsorption ◽  
Adsorption Method ◽  
Au Nps

This work presents the catalysts of Pt-Bi shells on Au nanoparticle cores and Pt overlayers on the Pt-Bi shells toward formic acid oxidation (FAO). Pt and Bi were co-deposited on Au nanoparticles (Au NP) via the irreversible adsorption method using a mixed precursor solution of Pt and Bi ions, and the amount of the co-deposits was controlled with the repetition of the deposition cycle. Rinsing of the co-adsorbed ionic layers of Pt and Bi with a H2SO4 solution selectively removed the Bi ions to leave Pt-rich and Bi-lean (<0.4 atomic %) co-deposits on Au NP (Pt-Bi/Au NP), conceptually similar to de-alloying. Additional Pt was deposited over Pt-Bi/Au NPs (Pt/Pt-Bi/Au NPs) to manipulate further the physicochemical properties of Pt-Bi/Au NPs. Transmission electron microscopy revealed the core–shell structures of Pt-Bi/Au NPs and Pt/Pt-Bi/Au NPs, whose shell thickness ranged from roughly four to six atomic layers. Moreover, the low crystallinity of the Pt-containing shells was confirmed with X-ray diffraction. Electrochemical studies showed that the surfaces of Pt-Bi/Au NPs were characterized by low hydrogen adsorption abilities, which increased after the deposition of additional Pt. Durability tests were carried out with 1000 voltammetric cycles between −0.26 and 0.4 V (versus Ag/AgCl) in a solution of 1.0 M HCOOH + 0.1 M H2SO4. The initial averaged FAO performance on Pt-Bi/Au NPs and Pt/Pt-Bi/Au NPs (0.11 ± 0.01 A/mg, normalized to the catalyst weight) was higher than that of a commercial Pt nanoparticle catalyst (Pt NP, 0.023 A/mg) by a factor of ~5, mainly due to enhancement of dehydrogenation and suppression of dehydration. The catalytic activity of Pt/Pt-Bi/Au NP (0.04 ± 0.01 A/mg) in the 1000th cycle was greater than that of Pt-Bi/Au NP (0.026 ± 0.003 A/mg) and that of Pt NP (0.006 A/mg). The reason for the higher durability was suggested to be the low mobility of surface Pt atoms on the investigated catalysts.

scholarly journals Formic Acid Oxidation on Pd Thin Film Coated Au Nanocrystals

Surfaces ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 372-386 ◽  
Author(s):  
Yongan Tang ◽  
Shouzhong Zou
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Formic Acid ◽  
Single Crystals ◽  
High Performance ◽  
Formic Acid Oxidation ◽  
Oxidation Potential ◽  
Acid Oxidation ◽  
Band Theory ◽  
Gold Nanocrystals

Cubic, octahedral, and rhombic dodecahedral gold nanocrystals enclosed by {100}, {111}, and {110} facets, respectively, were prepared by a seed-mediated growth method at the room temperature. Palladium thin films were coated on these Au nanocrystals by a redox replacement approach to explore their catalytic activities. It is revealed that formic acid and carbon monoxide oxidation in 0.1 M HClO4 on Au nanocrystals coated with one monolayer (ML) of Pd are facet-dependent and resemble those obtained from corresponding Pd single crystals and Pd films deposited on bulk Au single crystals, suggesting epitaxial growth of Pd overlayers on the Au nanocrystal surfaces. As the Pd film thickness increased, formic acid oxidation current density decreased and the CO oxidation potential moved to more negative. The catalytic activity remained largely unchanged after 3–5 MLs of Pd deposition. The specific adsorption of (bi)sulfate was shown to hinder the formic acid oxidation and the effect decreased with the increasing Pd film thickness. These observations were explained in the framework of the d-band theory. This study highlights the feasibility of engineering high-performance catalysts through deposition of catalytically active metal thin films on facet-controlled inert nanocrystals.

Ultrathin AgPt alloy nanowires as a high-performance electrocatalyst for formic acid oxidation

Nano Research ◽  
2017 ◽  
Vol 11 (1) ◽  
pp. 499-510 ◽  
Author(s):  
Xian Jiang ◽  
Gengtao Fu ◽  
Xia Wu ◽  
Yang Liu ◽  
Mingyi Zhang ◽  
...  
Keyword(s):  
Formic Acid ◽  
High Performance ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Alloy Nanowires

Modification of Pt nanoelectrodes dispersed on carbon support using irreversible adsorption of Bi to enhance formic acid oxidation

2008 ◽  
Vol 53 (26) ◽  
pp. 7744-7750 ◽  
Author(s):  
Byung-Jun Kim ◽  
Kihyun Kwon ◽  
Choong Kyun Rhee ◽  
Jonghee Han ◽  
Tae-Hoon Lim
Keyword(s):  
Formic Acid ◽  
Carbon Support ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Irreversible Adsorption

scholarly journals Electrochemical Deposition of Platinum and Palladium on Gold Nanoparticles Loaded Carbon Nanotube Support for Oxidation Reactions in Fuel Cell

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Surin Saipanya ◽  
Somchai Lapanantnoppakhun ◽  
Thapanee Sarakonsri
Keyword(s):  
Carbon Nanotube ◽  
Formic Acid ◽  
Hydrogen Adsorption ◽  
Active Surface ◽  
Formic Acid Oxidation ◽  
Hydrogen Desorption ◽  
Acid Oxidation ◽  
Active Surface Area ◽  
Cyclic Voltammograms ◽  
Oxidation Reactions

Pt and Pd sequentially electrodeposited Au nanoparticles loaded carbon nanotube (Au-CNT) was prepared for the electrocatalytic study of methanol, ethanol, and formic acid oxidations. All electrochemical measurements were carried out in a three-electrode cell. A platinum wire and Ag/AgCl were used as auxiliary and reference electrodes, respectively. Suspension of the Au-CNT, phosphate buffer, isopropanol, and Nafion was mixed and dropped on glassy carbon as a working electrode. By sequential deposition method, PdPtPt/Au-CNT, PtPdPd/Au-CNT, and PtPdPt/Au-CNT catalysts were prepared. Cyclic voltammograms (CVs) of those catalysts in 1 M H2SO4solution showed hydrogen adsorption and hydrogen desorption reactions. CV responses for those three catalysts in methanol, ethanol, and formic acid electrooxidations studied in 2 M CH3OH, CH3CH2OH, and HCOOH in 1 M H2SO4show characteristic oxidation peaks. The oxidation peaks at anodic scan contribute to those organic substance oxidations while the peaks at cathodic scan are related with the reoxidation of the adsorbed carbonaceous species. Comparing all those three catalysts, it can be found that the PdPtPt/Au-CNT catalyst is good at methanol oxidation; the PtPdPt/Au-CNT effectively enhances ethanol oxidation while the PtPdPd/Au-CNT exceptionally catalyzes formic acid oxidation. Therefore, a different stoichiometry affects the electrochemical active surface area of the catalysts to achieve the catalytic oxidation reactions.

A High-Performance Bimetallic Pd-Cu Nanoparticles Membrane on Glassy Carbon Electrode for Formic Acid Oxidation

2013 ◽  
Vol 704 ◽  
pp. 264-269 ◽  
Author(s):  
Wei Wei ◽  
Yi Liu ◽  
Qi Jin Wan ◽  
Nian Jun Yang
Keyword(s):  
Formic Acid ◽  
Modified Electrode ◽  
High Performance ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Carbon Electrode ◽  
Mixed Solution ◽  
Glass Carbon Electrode ◽  
Cu Content ◽  
Glass Carbon

The Palladium-copper nanoparticles (PdCu NPs) have been prepared by potentiostatic electrodeposition from a mixture electrolyte of H2PdCl4 and CuSO4,then placed the electrode in sulfuric acid using cyclic voltammetry sweep a few laps to fabricate the PdCu NPs/glass carbon electrode (Pd-Cu/GCE). The modified electrode electrochemical properties of a preliminary study found that this modified electrode has good stability and electrochemical activity, experiments show that formic aicd has good voltammetric response of the electrode. The electrical activity of the formic acid in the Pd/GCE is lower than that in the Pd-Cu/GCE, this is due to the synergistic effect of the bimetal. When the Cu content is increased gradually in H2PdCl4 and CuSO4 a mixed solution, the formic acid oxidation peak currentlower, because Cu has no electrocatalytic activity for formic acid oxidation.

Size-controllable synthesis and high-performance formic acid oxidation of polycrystalline Pd nanoparticles

Rare Metals ◽  
2017 ◽  
Vol 38 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Hui-Hui Wang ◽  
Jin-Feng Zhang ◽  
Ze-Lin Chen ◽  
Meng-Meng Zhang ◽  
Xiao-Peng Han ◽  
...  
Keyword(s):  
Formic Acid ◽  
High Performance ◽  
Pd Nanoparticles ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Controllable Synthesis
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