Science· 2015Q1
Metal-free efficient photocatalyst for stable visible water splitting via a two-electron pathway
- 4,436citations
- Q1SCImago
- 2015year
Short summary
Researchers developed a metal-free carbon nanodot-carbon nitride (C3N4) nanocomposite that efficiently splits water using visible light, achieving a 2.0% solar energy conversion efficiency.
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Key points
- Developed a metal-free carbon nanodot-carbon nitride (C3N4) nanocomposite for photocatalytic water splitting.
- Achieved quantum efficiencies of 16% (420 nm), 6.29% (580 nm), and 4.42% (600 nm).
- Demonstrated an overall solar energy conversion efficiency of 2.0%.
- Catalyst is stable, low-cost, and made from Earth-abundant, environmentally friendly materials.
AI-generated from the title and abstract; the full text is not read.
Abstract
The use of solar energy to produce molecular hydrogen and oxygen (H2 and O2) from overall water splitting is a promising means of renewable energy storage. In the past 40 years, various inorganic and organic systems have been developed as photocatalysts for water splitting driven by visible light. These photocatalysts, however, still suffer from low quantum efficiency and/or poor stability. We report the design and fabrication of a metal-free carbon nanodot-carbon nitride (C3N4) nanocomposite and demonstrate its impressive performance for photocatalytic solar water splitting. We measured quantum efficiencies of 16% for wavelength λ = 420 ± 20 nanometers, 6.29% for λ = 580 ± 15 nanometers, and 4.42% for λ = 600 ± 10 nanometers, and determined an overall solar energy conversion efficiency of 2.0%. The catalyst comprises low-cost, Earth-abundant, environmentally friendly materials and shows excellent stability.
The authors' abstract, as published at the source. Science, 2015 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy