Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions

Since the reaction rate and cost for cathodic catalyst in polymer electrolyte membrane fuel cells are obstacles for commercialization, the high-performance catalyst for oxygen reduction reaction is necessary. The Ni encapsulated with N-doped graphitic carbon (Ni@NGC) prepared with ethylenediamine and carbon black is employed as an efficient support for the oxygen reduction reaction. Characterizations show that the Ni@NGC has a large surface area and mesoporous structure that is suitable to the support for the Pt catalyst. The catalyst structure is identified and the size of Pt nanoparticles distributed in the narrow range of 2–3 nm. Four different nitrogen species are doped properly into graphitic carbon structure. The Pt/Ni@NGC shows higher performance than the commercial Pt/C catalyst in an acidic electrolyte. The mass activity of the Pt/Ni@NGC in fuel cell tests exhibits over 1.5 times higher than that of commercial Pt/C catalyst. The Pt/Ni@NGC catalyst at low Pt loading exhibits 47% higher maximum power density than the Pt/C catalyst under H2-air atmosphere. These results indicate that the Ni@NGC as a support is significantly beneficial to improving activity.

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Hybrid Structure of TiO2-Graphitic Carbon as a Support of Pt Nanoparticles for Catalyzing Oxygen Reduction Reaction

Catalysts ◽

10.3390/catal11101196 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1196

Author(s):

Su-Jin Jang ◽

Yun Chan Kang ◽

Jin-Su Hyun ◽

Tae Ho Shin ◽

Young Wook Lee ◽

...

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Pt Nanoparticles ◽

Hybrid Structure ◽

Reduction Reaction ◽

Graphitic Carbon ◽

Pt Catalyst ◽

Metal Support Interaction ◽

Activity Loss ◽

Supported Pt Catalyst

The durability of catalysts in fuel cells is a longstanding issue that needs to be resolved. Catalyst stability of the fuel cell has always been a problem, studies are underway to address them. Herein, to address this issue, we synthesize a hybrid structure consisting of SP carbon (SP) as the graphitic carbon and TiO2 as the metal oxide using a microwave method for use as a support for Pt nanoparticles. Anatase TiO2 and Pt nanoparticles with sizes of ~5 and 3.5 ± 1.4 nm, respectively, are uniformly dispersed on a modified graphitic SP carbon support (Pt-TiO2-SP). This supported Pt catalyst exhibits significantly improves durability in the oxygen reduction reaction (ORR). Furthermore, the Pt-TiO2-SP carbon hybrid catalyst manifests superior electrocatalytic stability and higher onset potential in ORR than those exhibited by Pt-SP carbon without TiO2. Pt-TiO2-SP exhibits an activity loss of less than 68 mV after 5000 electrochemical cycles, whereas an activity loss of ~100 mV is observed for Pt-SP carbon in a stability test. These results suggest that the strong metal–support interaction in TiO2-supported Pt catalyst significantly enhances the activity of Pt nanocatalyst.

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A rational synthesis of single-atom iron–nitrogen electrocatalysts for highly efficient oxygen reduction reaction

Journal of Materials Chemistry A ◽

10.1039/d0ta04798h ◽

2020 ◽

Vol 8 (32) ◽

pp. 16271-16282 ◽

Cited By ~ 4

Author(s):

Juanjuan Huo ◽

Li Lu ◽

Ziyan Shen ◽

Yan Liu ◽

Jiaojiao Guo ◽

...

Keyword(s):

Catalytic Activity ◽

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Alkaline Solution ◽

Porous Carbon ◽

High Stability ◽

Reduction Reaction ◽

Single Atom ◽

Methanol Tolerance ◽

Highly Efficient

A feasible strategy was explored to achieve atomically dispersed Fe–Nx sites anchoring on porous carbon hybrid (Fe-SA/PC). The catalyst possessed excellent catalytic activity, high stability and methanol-tolerance toward ORR in alkaline solution.

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Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters

Science ◽

10.1126/science.1134569 ◽

2007 ◽

Vol 315 (5809) ◽

pp. 220-222 ◽

Cited By ~ 1410

Author(s):

J. Zhang ◽

K. Sasaki ◽

E. Sutter ◽

R. R. Adzic

Keyword(s):

Oxygen Reduction ◽

Pt Nanoparticles ◽

Reduction Reaction ◽

Oxidation Potential ◽

Gold Clusters ◽

Pt Catalyst ◽

Potential Cycling ◽

Au Clusters ◽

X Ray Absorption

We demonstrated that platinum (Pt) oxygen-reduction fuel-cell electrocatalysts can be stabilized against dissolution under potential cycling regimes (a continuing problem in vehicle applications) by modifying Pt nanoparticles with gold (Au) clusters. This behavior was observed under the oxidizing conditions of the O2 reduction reaction and potential cycling between 0.6 and 1.1 volts in over 30,000 cycles. There were insignificant changes in the activity and surface area of Au-modified Pt over the course of cycling, in contrast to sizable losses observed with the pure Pt catalyst under the same conditions. In situ x-ray absorption near-edge spectroscopy and voltammetry data suggest that the Au clusters confer stability by raising the Pt oxidation potential.

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Chemical deposition of hard composite coatings Ni–Cu–P–Cr2O3

10.36652/1813-1336-2020-16-4-179-181 ◽

2020 ◽

pp. 179-181

Author(s):

A.A. Abrashov A.A. ◽

E.G. Vinokurov ◽

M.A. Egupova ◽

V.D. Skopintsev

Keyword(s):

Chromium Oxide ◽

Alkaline Solution ◽

Composite Coatings ◽

Chemical Deposition ◽

Alkaline Solutions ◽

Functional Surface ◽

Heat Treated ◽

Weakly Acid Solution ◽

Coating Composition ◽

Weakly Acidic Solution

The technological (deposition rate, coating composition) and functional (surface roughness, microhardness) characteristics of chemical composite coatings Ni—Cu—P—Cr2O3 obtained from weakly acidic and slightly alkaline solutions are compared. It is shown that coatings deposited from slightly alkaline solution contain slightly less phosphorus and chromium oxide than coatings deposited from weakly acid solution (2...3 % wt. phosphorus and up to 3.4 % wt. chromium oxide), formed at higher rate (24...25 microns per 1 hour of deposition at temperature of 80 °C), are characte rized by lower roughness and increased microhardness. The Vickers microhardness at 0.05 N load of composite coatings obtained from slightly alkaline solution and heat-treated at 400 °C for 1 hour is 13.5...15.2 GPa, which is higher than values for coatings deposited made of weakly acidic solution. The maximum microhardness of coatings is achieved at concentration 20 g/l of Cr2O3 particles. The technology of chemical deposition of Ni—Cu—P—Cr2O3 coatings formed in slightly alkaline solution is promising for obtaining of materials with increased hardness and wear resistance.

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Pt Distribution- Controlled Ni-Pt Nanocrystals via Alcohol Reduction Technique for Oxygen Reduction Reaction

New Journal of Chemistry ◽

10.1039/d1nj01360b ◽

2021 ◽

Author(s):

Kaneyuki Taniguchi ◽

Jhon Lehman Cuya Huaman ◽

Dausuke Iwata ◽

Shun Yokoyama ◽

Takatoshi Matsumoto ◽

...

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Pt Nanoparticles ◽

Cost Benefit ◽

Reduction Reaction ◽

Reduction Technique ◽

Co Poisoning ◽

Transition Elements ◽

Poisoning Effect ◽

Alcohol Reduction

Alloying Pt with transition elements as electrodes in fuel cells has been proposed to solve the CO poisoning effect besides cost-benefit. Consequently, the use of Ni-Pt nanoparticles (NPs) has been...

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