Role of Trap Optimization in a Heterostructure Carbon Nitride as a Methodology to Enhance Photocatalytic Hydrogen Production

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(42), P. 10651 - 10660

Published: Oct. 16, 2024

Carbon-based catalysts hold significant promise for photocatalytic hydrogen evolution. A critical challenge lies in optimizing the balance between electron longevity and its accumulation to avoid bottlenecks efficiency. In this study, we introduce an innovative efficient strategy rapid extraction (<100 fs) of photoinduced free electrons from a carbon-based catalyst without forming additional metal-based heterojunction hybrids. This method effectively prevents excessive carriers within catalyst. The rapidly extracted are then utilized production, resulting 10-fold increase activity compared pristine catalyst, with platinum (3 wt%) used as cocatalyst. Our significantly enhances performance state-of-the-art offering clean cost-effective producing energy. work demonstrates how fundamental understanding molecular-level phenomena their optimization can pave way delivering affordable energy society.

Language: Английский

Zn_0.5Cd_0.5Se Embedded CuS 0D/2D S-Scheme Heterojunction for Surface-Plasmon-Resonance Enhanced Photocatalytic H₂O₂ Production and para-Nitrophenol Reduction

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 8(1), P. 388 - 402

Published: Dec. 25, 2024

Artificial photosynthesis has ignited the spark for significant hydrogen peroxide (H2O2) formation owing to its environmental sustainability and cost-effectiveness; however, limited light absorption potential sluggish charge separation/migration hinder overall photocatalytic efficiency. To overcome this, a heterostructure of point-to-face S-scheme heterojunction integrated with surface plasmon resonance (SPR) effect is demonstrated exhibit high performance. Herein, we synthesized zero-dimensional Zn0.5Cd0.5Se (ZCSe) QDs decorated on CuS (CS) nanosheets through two-step pathway. The optimized composite CZ2 exhibited H2O2 production (PHPP) rate 3.73 mmol g–1 h–1 in presence ethanol under visible light, which was higher than that shown by their pristine components, 0.14% solar chemical conversion efficiency surpassed majority sulfide/selenide-based photocatalysts. Moreover, optimum exposed para-nitrophenol reduction (PNP) obtained highest 81% PNP within 120 min. photoluminescence, Mott–Schottky analysis, XPS, EPR, quenching experiments led better understanding mechanistic detail activity construction preserved carriers strong redox capacity both ZCSe CS. SPR Cu further boosted performances. Furthermore, loading QD CS nanosheet improved affinity H+ more negative zeta potential, promoted oxygen reaction PHPP, occurred single electron pathway facile stability up five cycles. This piece work sheds development multifunctional photocatalysts high-value chemicals.

Language: Английский