Science· 2014Q1
Nanoporous BiVO <sub>4</sub> Photoanodes with Dual-Layer Oxygen Evolution Catalysts for Solar Water Splitting
- 3,126citations
- Q1SCImago
- 2014year
Short summary
A nanoporous BiVO4 photoanode with a dual-layer catalyst (FeOOH/NiOOH) achieved a photocurrent density of 2.73 mA/cm² at 0.6 V vs. RHE for solar water splitting.
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Key points
- Nanoporous BiVO4 morphology (31.8 m²/g) improved electron-hole separation yield to 0.90 at 1.23 V vs. RHE.
- Dual-layer oxygen evolution catalyst (FeOOH/NiOOH) was serially applied to the BiVO4 photoanode.
- The BiVO4/FeOOH/NiOOH photoanode achieved a photocurrent density of 2.73 mA/cm² at 0.6 V vs. RHE.
AI-generated from the title and abstract; the full text is not read.
Abstract
Bismuth vanadate (BiVO4) has a band structure that is well-suited for potential use as a photoanode in solar water splitting, but it suffers from poor electron-hole separation. Here, we demonstrate that a nanoporous morphology (specific surface area of 31.8 square meters per gram) effectively suppresses bulk carrier recombination without additional doping, manifesting an electron-hole separation yield of 0.90 at 1.23 volts (V) versus the reversible hydrogen electrode (RHE). We enhanced the propensity for surface-reaching holes to instigate water-splitting chemistry by serially applying two different oxygen evolution catalyst (OEC) layers, FeOOH and NiOOH, which reduces interface recombination at the BiVO4/OEC junction while creating a more favorable Helmholtz layer potential drop at the OEC/electrolyte junction. The resulting BiVO4/FeOOH/NiOOH photoanode achieves a photocurrent density of 2.73 milliamps per square centimenter at a potential as low as 0.6 V versus RHE.
The authors' abstract, as published at the source. Science, 2014 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy