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Standard Electrode Potentials03:02

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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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Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation.

Peng-Fei Liu1, Chongwu Wang1, Yun Wang2

  • 1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.

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|January 19, 2023
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Summary
This summary is machine-generated.

Researchers engineered hematite (α-Fe2O3) photoanodes by shrinking the crystal lattice. This significantly lowered the water-splitting onset potential, achieving a record low for pristine hematite without surface modification.

Keywords:
Energy bandHematiteOnset potentialPhotoelectrochemical water oxidationSpin states

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Photoelectrochemical (PEC) water splitting is crucial for converting solar energy into chemical fuels.
  • Hematite (α-Fe2O3) is a promising photoanode material due to its abundance, stability, and light absorption.
  • Current hematite photoanodes require additional bias for overall water splitting due to deep electron affinity.

Purpose of the Study:

  • To engineer the energy bands of hematite by shrinking its crystal lattice.
  • To reduce the water-splitting onset potential of hematite photoanodes.
  • To investigate the underlying mechanisms for the reduced onset potential.

Main Methods:

  • Energy band engineering of hematite via crystal lattice shrinking.
  • Measurement of water-splitting onset potential.
  • X-ray absorption spectroscopy and magnetic property analysis.
  • Density functional theory (DFT) calculations.

Main Results:

  • Reduced water-splitting onset potential from 1.14 V to 0.61 V vs. the reversible hydrogen electrode.
  • Achieved the lowest reported onset potential for a pristine hematite photoanode.
  • Observed redistribution of 3d electrons in the grey hematite electrode.
  • DFT studies confirmed raised energy bands in smaller-lattice-constant hematite.

Conclusions:

  • Shrinking the crystal lattice of hematite effectively engineers its energy bands.
  • This band engineering significantly lowers the onset potential for water splitting.
  • The findings offer a new strategy for developing efficient pristine hematite photoanodes for solar fuel production.