Catalytic properties of Pd nanoparticles supported on Cu2O microspheres for hydrogen peroxide electroreduction

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53320-53325 ◽  
Author(s):  
Limei Sun ◽  
Shuaishuai Zhang ◽  
Wuyunga Bao ◽  
Wurigamula He
Keyword(s):  
Hydrogen Peroxide ◽  
Copper Oxide ◽  
Cuprous Oxide ◽  
Catalytic Properties ◽  
Catalyst Activity ◽  
Pd Nanoparticles ◽  
Chemical Approach ◽  
Wet Chemical ◽  
Hydrogen Peroxide Electroreduction

Cu2O was synthesized by a wet-chemical approach, and Pd electrocatalysts supported on cuprous oxide (Pd/Cu2O) and Vulcan XC-72 (Pd/C) were synthesized. The Pd/Cu2O catalyst comprised copper oxide and metallic Cu, improving the catalyst activity for H2O2 electroreduction.

CATALYSIS OF CUPROUS OXIDE TOWARD HYDROGEN PEROXIDE ELECTROREDUCTION

2012 ◽  
Vol 11 (06) ◽  
pp. 1240027 ◽  
Author(s):  
LIMEI SUN ◽  
JING CHEN
Keyword(s):  
Cuprous Oxide ◽  
Chemical Method ◽  
Average Diameter ◽  
Sem Analysis ◽  
Cubic Phase ◽  
Oxide Nanoparticles ◽  
Wet Chemical Method ◽  
Composition And Structure ◽  
Wet Chemical ◽  
Hydrogen Peroxide Electroreduction

The cuprous oxide nanoparticles were prepared with glucose as reducing agent by a wet-chemical method. The composition and structure of the catalysts were characterized with XRD and SEM analysis. The catalytic activity and stability of the catalyst for the H2O2 reduction were studied using the curves of cyclic voltammetry and chronoamperometry. The results showed that the crystal structure of the synthesized Cu2O was the pure cubic phase and the crystallite size was about 19.5 nm. The Cu2O powder was spherical and the average diameter of the spheres is about 1.0 μm. The Cu2O nanoparticles were active for H2O2 electroreduction and the current density was about 30 mA cm-2 at E = -0.4 V .

Kinetics of hydrogen peroxide electroreduction on Pd nanoparticles in acidic medium

2008 ◽  
Vol 621 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Dianxue Cao ◽  
Limei Sun ◽  
Guiling Wang ◽  
Yanzhuo Lv ◽  
Milin Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Acidic Medium ◽  
Pd Nanoparticles ◽  
Kinetics Of ◽  
Hydrogen Peroxide Electroreduction

Decomposition of hydrogen peroxide on a two-component NiO-CdO catalyst and the effect of ionizing radiation on its catalytic properties

1979 ◽  
Vol 44 (4) ◽  
pp. 1015-1022 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Nickel Oxide ◽  
Catalytic Properties ◽  
Cadmium Oxide ◽  
Chemisorb Oxygen ◽  
Composition Region ◽  
Chemisorbed Oxygen ◽  
Two Component

The catalytic properties of two-component catalyst nickel oxide-cadmium oxide with the proportions of the components covering the whole composition region 0-100% were examined by studying the decomposition of hydrogen peroxide in aqueous solution on it. In the range 0-25 mol.% CdO, cadmium oxide is found to affect infavourably the ability of nickel oxide to chemisorb oxygen. The amount of the chemisorbed oxygen increases several times on gamma irradiation of the samples. The effect of cadmium oxide on the catalytic activity of the system shows up in fresh samples only indirectly via the changed amount of the oxygen chemisorbed. In older samples the initial catalytic activity of the system is changed, which can be explained based on the concept of bivalent catalytic centres in terms of the co-action of the catalytic centres of the two oxides, which are in equilibrium. The irradiation of the system under study speeds up the processes leading to the establishing of this equilibrium which is thermally very stable, and results in a substantial increase of the catalytic activity of the samples investigated.

Hydrogen peroxide decomposition on a two-component CuO-Cr2O3 catalyst

1988 ◽  
Vol 53 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Viliam Múčka ◽  
Kamil Lang
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Extreme Values ◽  
Catalytic Properties ◽  
Active Components ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Peroxide Decomposition ◽  
Two Component ◽  
Catalytically Active

Some physical and catalytic properties of the two-component copper(II)oxide-chromium(III)oxide catalyst with different content of both components were studied using the decomposition of the aqueous solution of hydrogen peroxide as a testing reaction. It has been found that along to both basic components, the system under study contains also the spinel structure CuCr2O4, chromate washable by water and hexavalent ions of chromium unwashable by water. The soluble chromate is catalytically active. During the first period of the reaction the equilibrium is being established in both homogeneous and heterogeneous catalytic systems. The catalytic activity as well as the specific surface area of the washed solid is a non-monotonous function of its composition. It seems highly probable that the extreme values of both these quantities are not connected with the detected admixtures in the catalytic system. The system under study is very insensitive with regard to the applied doses of gamma radiation. Its catalytic properties are changed rather significantly after the thermal treatment and particularly after the partial reduction to low degree by hydrogen. The observed changes of the catalytic activity of the system under study are very probably in connection with the changes of the valence state of the catalytically active components of the catalyst.

Decomposition of hydrogen peroxide on cerium dioxide-nickel oxide two-component catalysts and the effect of ionizing radiation on them

1984 ◽  
Vol 49 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Heat Treatment ◽  
Hydrogen Peroxide ◽  
Ionizing Radiation ◽  
Nickel Oxide ◽  
Cerium Dioxide ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Ion Pairs ◽  
Composition Region ◽  
Two Component

Some physical and catalytic properties of cerium dioxide-nickel oxide two-component catalysts have been studied over the entire composition region, employing the decomposition of hydrogen peroxide in aqueous solution as a model catalytic process. The two oxides have been found to affect each other, particularly for NiO contents of 9.1 and 96.7 mol%; the mutual influencing, the nature of which in the conditions applied remains unaffected by heat treatment of the sample or by its exposition to ionizing radiation, is manifested by the nonmonotonic dependences of the oxidation power and of the specific activity of the catalysts on their composition. This can be interpreted in terms of the concept of bivalent catalytic centres, assuming that for nickel oxide the centres consist of Ni2+-Ni3+ ion pairs, for cerium dioxide they consist of Ce3+-Ce4+ ion pairs, and that in the region of the mutual influencing , Ni2+-Ce4+ ion pairs play a major role. Within the scope of this concept, the increase in the oxidation power of all the catalysts in question and a simultaneously decrease in the specific activity of the pure nickeloxide exposed to ionizing radiation can be explained in terms of the ionization effect.

Optimization of Superhydrophobicity at the Surface of Iron Sulfide Thin Films by a Wet Chemical Approach

2021 ◽  
pp. 111476
Author(s):  
Ghulam Murtaza ◽  
Usama Zulfiqar ◽  
Ben F. Spencer ◽  
Sai P. Venkateswaran ◽  
Firoz Alam ◽  
...  
Keyword(s):  
Thin Films ◽  
Iron Sulfide ◽  
Chemical Approach ◽  
Wet Chemical
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