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Related Experiment Video

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Surface Assistant Charge Separation in PEC Cu2S-Ni/Cu2O Cathode.

Wan Zhang1, Ruotian Chen2, Zhiguang Yin1

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , Shaanxi , China.

ACS Applied Materials & Interfaces
|August 24, 2019
PubMed
Summary
This summary is machine-generated.

A novel Cu₂S-Ni/Cu₂O photocathode was fabricated for enhanced photoelectrocatalysis (PEC). This Ni-modified electrode significantly boosts hydrogen evolution reaction efficiency and charge separation, achieving double the photocurrent of pristine Cu₂O.

Keywords:
H evolutioncharge dynamicscuprous oxidephotoelectrocatalysissurface charge separation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photocatalysis

Background:

  • Developing high-efficiency photocathodes is crucial for advancing photoelectrocatalysis (PEC).
  • Existing photocathode materials often face limitations in charge separation and catalytic activity.

Purpose of the Study:

  • To construct and characterize a novel Cu₂S-Ni/Cu₂O photocathode for improved PEC performance.
  • To investigate the role of Nickel (Ni) incorporation on the photocathode's morphology, charge dynamics, and catalytic activity.

Main Methods:

  • Fabrication of Cu₂S-Ni/Cu₂O photocathode using electrodeposition, direct-current magnetron sputtering (DCMS), and ion exchange.
  • Material characterization using X-ray Photoelectron Spectroscopy (XPS).
  • Electrochemical and photophysical analysis including Electrochemical Impedance Spectroscopy (EIS), Tafel slopes, Photoluminescence (PL) spectra, and Surface Photovoltage Microscopy (SPVM).

Main Results:

  • The Ni inner-layer enhanced the formation rate and morphology of the outer Cu₂S layer; Ni was present as NiO.
  • The Cu₂S-Ni/Cu₂O photocathode exhibited a photocurrent density twice that of the pristine Cu₂O.
  • Ni promoted the hydrogen evolution reaction via the Heyrovsky mechanism, while Cu₂S improved surface charge separation.

Conclusions:

  • The integrated Cu₂S-Ni/Cu₂O structure effectively enhances photoelectrocatalytic hydrogen evolution.
  • Ni incorporation plays a key role in promoting catalytic activity and facilitating charge transfer.
  • SPVM provided direct evidence of the charge transport pathway, elucidating the function of each component.