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Voltaic/Galvanic Cells02:47

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Copper oxide-based cathode for direct NADPH regeneration.

J T Kadowaki1, T H Jones1, A Sengupta2

  • 1Applied Physics Laboratory, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, USA.

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|January 9, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel nanostructured cathode for efficient electrochemical regeneration of nicotinamide adenine dinucleotide phosphate (NADPH). This breakthrough achieves high product purity and low energy consumption, advancing biofuel and artificial photosynthesis technologies.

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Area of Science:

  • Biochemistry
  • Electrochemistry
  • Materials Science

Background:

  • Oxidoreductases are crucial enzymes for cellular metabolism, with many reactions relying on nicotinamide adenine dinucleotide (NADH) and its phosphorylated form (NADPH).
  • Efficient regeneration of NADPH is vital for chemoenzymatic synthesis, but existing methods often suffer from poor product purity.

Purpose of the Study:

  • To develop a highly efficient and selective method for the direct electrochemical regeneration of NADPH from NADP+.
  • To investigate the role of nanostructured materials in improving catalyst performance for NADPH regeneration.

Main Methods:

  • Fabrication of a nanostructured heterolayer Ni-Cu2O-Cu cathode using a photoelectrochemical process.
  • Electrochemical characterization of the cathode for NADPH regeneration efficiency and selectivity.

Main Results:

  • Achieved efficient electrochemical regeneration of NADP+ to NADPH with two-thirds conversion.
  • Demonstrated high product selectivity, with no measurable production of the inactive (NADP)2 dimer.
  • Observed the lowest reported overpotential for NADPH regeneration (-0.75 V vs. Ag/AgCl).
  • Identified the critical role of nickel sputtering in creating a unique surface morphology for enhanced selectivity.

Conclusions:

  • The developed Ni-Cu2O-Cu cathode offers an efficient and selective solution for electrochemical NADPH regeneration.
  • This heterogeneous catalyst is promising for integrated electrolyzer platforms in biofuel production, solar energy conversion, and artificial photosynthesis.