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Surface Plasmon Resonance Enhanced Hydrogen Evolution from Water with Graphitic Carbon Nitride Photocatalyst.
- Source :
- Catalysis Letters; Aug2023, Vol. 153 Issue 8, p2296-2307, 12p
- Publication Year :
- 2023
-
Abstract
- Solar energy can generate hydrogen via water splitting, which could decrease the environmental pollutions. During the photocatalytic hydrogen generation, some semiconductors can improve efficiencies. Recently, graphitic carbon nitride (g-C<subscript>3</subscript>N<subscript>4</subscript>) attracts interests due to visible light response. However, pristine g-C<subscript>3</subscript>N<subscript>4</subscript> exhibits low photocatalytic activity. In this work, Au nanorods (Au NRs) were prepared via the colloidal seed-mediated approach, which assembled different structures by L-Cysteine (L-Cys). Meanwhile, the g-C<subscript>3</subscript>N<subscript>4</subscript> was synthesized by means of thermal condensation of melamine. Based on this, we reports some photocatalysts by combining different Au NRs structures (random, aligned and aggregated) with g-C<subscript>3</subscript>N<subscript>4</subscript>. The hydrogen generation rates of different Au NR/g-C<subscript>3</subscript>N<subscript>4</subscript> composites are 30.1 μmol h<superscript>−1</superscript> g<superscript>−1</superscript> (aligned), 44.5 μmol h<superscript>−1</superscript> g<superscript>−1</superscript> (random) and 46.9 μmol h<superscript>−1</superscript> g<superscript>−1</superscript> (aggregated), respectively. Interestingly, the hydrogen evolution rates are proportional to the surface plasmon resonance (SPR) enhancements of different Au NRs structures. The random and aggregated structures with some vertical Au NRs in contact with g-C<subscript>3</subscript>N<subscript>4</subscript>, can provide a better circuit for continuous flow of hot charge carriers. Nevertheless, horizontally aligned Au NRs reduce the Schottky barrier between Au NRs and g-C<subscript>3</subscript>N<subscript>4</subscript>, which enhances the back electrons and thus slow down the hydrogen generation. Our work reveals the effective Au/semiconductor photocatalysts to fabricate the vertically oriented Au NR layer contact with the semiconductor surface. This represents one of the future directions in this field. The preparation of different photocatalysts based on pristine g-C<subscript>3</subscript>N<subscript>4</subscript> and aligned Au NR structures with g-C<subscript>3</subscript>N<subscript>4</subscript>. Our present work reveals the effective Au/semiconductor photocatalysts are to fabricate a highly vertically oriented Au NR layer with the ends of the Au NRs in direct contact with the semiconductor surface. This represents one of the future directions in this field. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1011372X
- Volume :
- 153
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Catalysis Letters
- Publication Type :
- Academic Journal
- Accession number :
- 165048403
- Full Text :
- https://doi.org/10.1007/s10562-022-04168-z