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Copper-based electrocatalyst for hydrogen evolution in water.

Abdullah M Abudayyeh1,2, Michael S Bennington1,2, Johan Hamonnet3,2

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Summary
This summary is machine-generated.

A copper complex ([CuIILEt]BF4) forms a stable electrocatalyst for hydrogen evolution reactions (HER) through controlled potential electrolysis (CPE). This deposited material demonstrates long-lived catalytic activity, proving effective for HER.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • The hydrogen evolution reaction (HER) is crucial for sustainable energy technologies.
  • Developing efficient and stable electrocatalysts is key to advancing HER.
  • Copper complexes offer potential as cost-effective HER catalysts.

Purpose of the Study:

  • To investigate the electrocatalytic properties of a specific copper complex, [CuIILEt]BF4, for the hydrogen evolution reaction (HER).
  • To characterize the electrodeposited material formed from the copper complex during controlled potential electrolysis (CPE).
  • To evaluate the stability and long-term performance of the electrodeposited HER electrocatalyst.

Main Methods:

  • Controlled potential electrolysis (CPE) of [CuIILEt]BF4 at -1.10 V vs. Ag|AgCl in aqueous pH 7 phosphate buffer.
  • Electrochemical characterization and performance testing of the electrodeposited material.
  • Analysis of the deposit composition using Energy-Dispersive X-ray Spectroscopy (EDS), Powder X-ray Diffraction (PXRD), and Scanning Electron Microscopy (SEM).

Main Results:

  • CPE of [CuIILEt]BF4 resulted in a stable, heterogeneous deposit on the glassy carbon working electrode (GCWE).
  • The electrodeposited material exhibited significant and ongoing catalytic activity for the hydrogen evolution reaction (HER), with high turnover numbers (TON) and Faradaic efficiency (FE).
  • Analysis indicated the deposit primarily consisted of copper and copper(I) oxide, with superior catalytic activity compared to deposits from simple copper salts.

Conclusions:

  • The literature square planar copper complex, [CuIILEt]BF4, serves as a precursor for a highly effective and stable HER electrocatalyst upon controlled potential electrolysis.
  • The electrodeposited copper and copper(I) oxide material demonstrates robust catalytic performance and long-term stability, making it a promising candidate for HER applications.
  • The formation of a robustly attached deposit is crucial for the observed long-lived catalytic activity in HER.