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A sequential doping strategy for architecturally controlled BiVO4 photoanodes with synergistic co-doping enabled by

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Researchers developed a new doping method for bismuth vanadate (BiVO4) photoanodes, significantly boosting solar fuel production efficiency. This breakthrough enhances charge transport in BiVO4, paving the way for advanced solar energy conversion devices.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Nanoporous bismuth vanadate (BiVO4) photoanodes fabricated via bismuth oxyiodide (BiOI) templating offer high-quality films.
  • Conventional doping is incompatible with BiOI-templated BiVO4, leading to poor charge transport and limited performance in pristine BiVO4.

Purpose of the Study:

  • To introduce a novel doping strategy for BiVO4 photoanodes.
  • To overcome the limitations of bulk charge transport in BiOI-templated BiVO4.
  • To enhance the performance of BiVO4 photoanodes for solar fuel generation.

Main Methods:

  • Developed a controlled, quantitative, precursor-state, sequential doping strategy.
  • Co-doped BiVO4 with barium (Ba) and niobium (Nb).
  • Decorated the optimized Nb/Ba co-doped BiVO4 photoanode with a nickel iron oxide (NiFeO_x) co-catalyst.

Main Results:

  • Achieved over 95% charge separation efficiency.
  • The optimized Nb/Ba co-doped BiVO4 photoanode demonstrated a photocurrent density of 6.2 mA cm^-2 at 1.23 V vs. RHE.
  • A 4-fold increase in photocurrent density compared to the undoped counterpart was observed.

Conclusions:

  • The novel doping strategy effectively resolves bulk electronic limitations in BiOI-templated BiVO4.
  • The synergetic co-doping of Nb and Ba significantly enhances photoanode performance.
  • This work sets a new standard for designing high-performance solar fuel devices using rational design principles.