scholarly journals Confined Electrochemical Behaviors of Single Platinum Nanoparticles Revealing Ultrahigh Density of Gas Molecules inside a Nanobubble

2021 ◽  
Author(s):  
Wei Ma ◽  
Ze-Hui Sun ◽  
Zhihao Gu
Keyword(s):  
Platinum Nanoparticles ◽  
Catalytic Decomposition ◽  
Active Surface ◽  
Electrochemical Measurement ◽  
Stochastic Motion ◽  
Proton Reduction ◽  
Electrochemical Behaviors ◽  
Gas Molecules ◽  
Ultrahigh Density ◽  
Single Oxygen

Abstract Understanding the basic physicochemical properties of gas molecules confined within nanobubbles is of fundamental importance for chemical and biological process. Here we successfully monitored the nanobubble-confined electrochemical behaviors of single platinum nanoparticles (PtNPs) at a carbon fiber ultramicroelectrode in HClO4 and H2O2 solution. Owing to the catalytic decomposition of H2O2, a single oxygen nanobubble formed on individual PtNPs to block the active surface of particle for proton reduction and suppress their stochastic motion, resulting in significantly distinguished current traces. Furthermore, the combination of theoretical calculation and high-resolution electrochemical measurement allowed the size of nanobubble and the oxygen gas density inside a single nanobubble to be quantified. And the ultrahigh oxygen density inside (9286 kg/m3) was revealed, indicating gas molecules in a nanosized space existed with a high state of aggregation. Our approach sheds light on gas aggregation behaviors of nanoscale bubbles using single-entity electrochemical measurement.

Characterization of electrocatalytic proton reduction and surface adsorption of platinum nanoparticles supported by a polymeric stabilizer on an ITO electrode

2022 ◽  
Author(s):  
Yuta Tsubonouchi ◽  
Masashi Kajita ◽  
Taichi Hayasaka ◽  
Hamada S. A. Mandour ◽  
Mohamed R Berber ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Platinum Nanoparticles ◽  
Colloidal Solution ◽  
Surface Adsorption ◽  
Chemical Adsorption ◽  
Proton Reduction ◽  
Ito Electrode ◽  
Polymeric Stabilizer

Platinum nanoparticles (PAA-Pt) stabilized by polyacrylic acid (PAA) of a polymeric stabilizer were adsorbed on an indium tin oxide (ITO) surface from their colloidal solution due to the chemical adsorption...

scholarly journals Glucose Biosensor Based on Disposable Activated Carbon Electrodes Modified with Platinum Nanoparticles Electrodeposited on Poly(Azure A)

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4489 ◽  
Author(s):  
Francisco Jiménez-Fiérrez ◽  
María Isabel González-Sánchez ◽  
Rebeca Jiménez-Pérez ◽  
Jesús Iniesta ◽  
Edelmira Valero
Keyword(s):  
Platinum Nanoparticles ◽  
High Performance ◽  
Electrochemical Biosensor ◽  
Limit Of Detection ◽  
Electrochemical Measurement ◽  
Glucose Biosensor ◽  
Carbon Electrodes ◽  
Real Samples ◽  
Glucose Determination ◽  
Azure A

Herein, a novel electrochemical glucose biosensor based on glucose oxidase (GOx) immobilized on a surface containing platinum nanoparticles (PtNPs) electrodeposited on poly(Azure A) (PAA) previously electropolymerized on activated screen-printed carbon electrodes (GOx-PtNPs-PAA-aSPCEs) is reported. The resulting electrochemical biosensor was validated towards glucose oxidation in real samples and further electrochemical measurement associated with the generated H2O2. The electrochemical biosensor showed an excellent sensitivity (42.7 μA mM−1 cm−2), limit of detection (7.6 μM), linear range (20 μM–2.3 mM), and good selectivity towards glucose determination. Furthermore, and most importantly, the detection of glucose was performed at a low potential (0.2 V vs. Ag). The high performance of the electrochemical biosensor was explained through surface exploration using field emission SEM, XPS, and impedance measurements. The electrochemical biosensor was successfully applied to glucose quantification in several real samples (commercial juices and a plant cell culture medium), exhibiting a high accuracy when compared with a classical spectrophotometric method. This electrochemical biosensor can be easily prepared and opens up a good alternative in the development of new sensitive glucose sensors.

Catalytic decomposition of hydrazine in weakly alkaline solutions on platinum nanoparticles

2004 ◽  
Vol 46 (6) ◽  
pp. 578-582 ◽  
Author(s):  
A. V. Anan?ev ◽  
M. Yu. Boltoeva ◽  
N. L. Sukhov ◽  
G. L. Bykov ◽  
B. G. Ershov
Keyword(s):  
Platinum Nanoparticles ◽  
Catalytic Decomposition ◽  
Alkaline Solutions ◽  
Weakly Alkaline

Ultrahigh Density of Gas Molecules Confined in Surface Nanobubbles in Ambient Water

2020 ◽  
Vol 142 (12) ◽  
pp. 5583-5593 ◽  
Author(s):  
Limin Zhou ◽  
Xingya Wang ◽  
Hyun-Joon Shin ◽  
Jian Wang ◽  
Renzhong Tai ◽  
...  
Keyword(s):  
Ambient Water ◽  
Gas Molecules ◽  
Ultrahigh Density

Catalytic Decomposition of Ammonia on Coatings Consisting of Organoboron and Platinum Nanoparticles

2018 ◽  
Vol 12 (5) ◽  
pp. 937-939
Author(s):  
M. V. Grishin ◽  
A. K. Gatin ◽  
V. G. Slutsky ◽  
V. A. Kharitonov ◽  
B. R. Shub
Keyword(s):  
Platinum Nanoparticles ◽  
Catalytic Decomposition

scholarly journals Reaction Model Taking into Account the Catalyst Morphology and Its Active Specific Surface in the Process of Catalytic Ammonia Decomposition

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7229
Author(s):  
Walerian Arabczyk ◽  
Rafał Pelka ◽  
Izabella Jasińska ◽  
Zofia Lendzion-Bieluń
Keyword(s):  
Specific Surface ◽  
Chemical Potential ◽  
Critical Concentration ◽  
Catalytic Decomposition ◽  
Active Surface ◽  
Reaction Model ◽  
Distribution Functions ◽  
Recrystallization Temperature ◽  
Nitrogen Diffusion ◽  
Entire Volume

Iron catalysts for ammonia synthesis/nanocrystalline iron promoted with oxides of potassium, aluminum and calcium were characterized by studying the nitriding process with ammonia in kinetic area of the reaction at temperature of 475 °C. Using the equations proposed by Crank, it was found that the process rate is limited by diffusion through the interface, and the estimated value of the nitrogen diffusion coefficient through the boundary layer is 0.1 nm2/s. The reaction rate can be described by Fick’s first equation. It was confirmed that nanocrystallites undergo a phase transformation in their entire volume after reaching the critical concentration, depending on the active specific surface of the nanocrystallite. Nanocrystallites transform from the α-Fe(N) phase to γ’-Fe4N when the total chemical potential of nitrogen compensates for the transformation potential of the iron crystal lattice from α to γ; thus, the nanocrystallites are transformed from the smallest to the largest in reverse order to their active specific surface area. Based on the results of measurements of the nitriding rate obtained for the samples after overheating in hydrogen in the temperature range of 500–700 °C, the probabilities of the density of distributions of the specific active surfaces of iron nanocrystallites of the tested samples were determined. The determined distributions are bimodal and can be described by the sum of two Gaussian distribution functions, where the largest nanocrystallite does not change in the overheating process, and the size of the smallest nanocrystallites increases with increasing recrystallization temperature. Parallel to the nitriding reaction, catalytic decomposition of ammonia takes place in direct proportion to the active surface of the iron nanocrystallite. Based on the ratio of the active iron surface to the specific surface, the degree of coverage of the catalyst surface with the promoters was determined.

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