Free-Standing Copper Oxide Films with In Situ Tailorable Nanostructures toward Detection of Hydrogen Peroxide

2019 ◽  
Vol 166 (10) ◽  
pp. B859-B865 ◽  
Author(s):  
Peng Gao ◽  
Yuxuan Gong
Keyword(s):  
Hydrogen Peroxide ◽  
Copper Oxide ◽  
Oxide Films ◽  
Free Standing

Sculpturing metal foams toward bifunctional 3D copper oxide nanowire arrays for pseudo-capacitance and enzyme-free hydrogen peroxide detection

2015 ◽  
Vol 3 (16) ◽  
pp. 8734-8741 ◽  
Author(s):  
Jianfei Huang ◽  
Huailong Li ◽  
Yihua Zhu ◽  
Qilin Cheng ◽  
Xiaoling Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Energy Storage ◽  
Copper Oxide ◽  
Metal Foams ◽  
Nanowire Arrays ◽  
Free Standing ◽  
Cuo Nanowires ◽  
Hydrogen Peroxide Detection ◽  
Copper Foam ◽  
Free Hydrogen

Nanoengineered copper foam with 3D free-standing CuO nanowires is used for enhanced pseudocapacitance energy storage and electroanalysis of H2O2.

Enhancing oxidation resistance of Cu during repeated melting by the in-situ formation of protective oxide films

2021 ◽  
Vol 286 ◽  
pp. 129234
Author(s):  
Yongli Guo ◽  
Hui Cai ◽  
Zhe Wang ◽  
Xin Wang ◽  
Peng Cao ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Oxide Films ◽  
Protective Oxide ◽  
In Situ Formation

scholarly journals Au Modified F-TiO2 for Efficient Photocatalytic Synthesis of Hydrogen Peroxide

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3844
Author(s):  
Lijuan Li ◽  
Bingdong Li ◽  
Liwei Feng ◽  
Xiaoqiu Zhang ◽  
Yuqian Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction System ◽  
Reaction Medium ◽  
Pure Tio2 ◽  
H2o2 Production ◽  
Tio2 Photocatalyst ◽  
H2o2 Decomposition ◽  
Spin Resonance ◽  
Photocatalytic Synthesis

In this work, Au-modified F-TiO2 is developed as a simple and efficient photocatalyst for H2O2 production under ultraviolet light. The Au/F-TiO2 photocatalyst avoids the necessity of adding fluoride into the reaction medium for enhancing H2O2 synthesis, as in a pure TiO2 reaction system. The F− modification inhibits the H2O2 decomposition through the formation of the ≡Ti–F complex. Au is an active cocatalyst for photocatalytic H2O2 production. We compared the activity of TiO2 with F− modification and without F− modification in the presence of Au, and found that the H2O2 production rate over Au/F-TiO2 reaches four times that of Au/TiO2. In situ electron spin resonance studies have shown that H2O2 is produced by stepwise single-electron oxygen reduction on the Au/F-TiO2 photocatalyst.

Effects of hydrogen peroxide and hypochlorite on membrane potential of mitochondria in situ in rat heart cells

1991 ◽  
Vol 69 (11) ◽  
pp. 1705-1712 ◽  
Author(s):  
Noburu Konno ◽  
K. J. Kako
Keyword(s):  
Hydrogen Peroxide ◽  
Membrane Potential ◽  
Mitochondrial Membrane Potential ◽  
Rat Heart ◽  
Mitochondrial Membrane ◽  
Isolated Rat Heart ◽  
Heart Mitochondria ◽  
High Concentrations ◽  
Isolated Rat

Hydrogen peroxide (H2O2) and hypochlorite (HOCl) cause a variety of cellular dysfunctions. In this study we examined the effects of these agents on the electrical potential gradient across the inner membrane of mitochondria in situ in isolated rat heart myocytes. Myocytes were prepared by collagenase digestion and incubated in the presence of H2O2 or HOCl. Transmembrane electrical gradients were measured by distribution of [3H]triphenylmethylphosphonium+, a lipophilic cation. The particulate fraction was separated from the cytosolic compartment first by permeabilization using digitonin, followed by rapid centrifugal sedimentation through a bromododecane layer. We found that the mitochondrial membrane potential (161 ± 7 mV, negative inside) was relatively well maintained under oxidant stress, i.e., the potential was decreased only at high concentrations of HOCl and H2O2 and gradually with time. The membrane potential of isolated rat heart mitochondria was affected similarly by H2O2 and HOCl in a concentration- and time-dependent manner. High concentrations of oxidants also reduced the cellular ATP level but did not significantly change the matrix volume. When the extra-mitochondrial free calcium concentration was increased in permeabilized myocytes, the transmembrane potential was decreased proportionally, and this decrease was potentiated further by H2O2. These results support the view that heart mitochondria are equipped with well-developed defense mechanisms against oxidants, but the action of H2O2 on the transmembrane electrical gradient is exacerbated by an increase in cytosolic calcium. Keywords: ATP, calcium, cardiomyocyte, cell defense, mitochondrial membrane potential, oxidant, triphenylmethylphosphonium.

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