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11. Upgraded charge transport in g-C3N4nanosheets by boron doping and their heterojunction with 3D CdIn2S4for efficient photodegradation of azo dye

Author

Nagappagari, Lakshmana Reddy, Patil, Santosh S., Lee, Jaewon, Park, Eunoak, Yu, Yeon-Tae, and Lee, Kiyoung

Abstract

The facilitation of charge transport toward the targeted chemical reaction is a challenging task for two-dimensional (2D) nanomaterials. We demonstrate the effectiveness of two different strategies, non-metal doping and heterojunction formation, to adjust the electronic and molecular structures of g-C3N4nanosheets (CN), which could widen the visible-light response and improve the photo-induced electron–hole separation. The g-C3N4nanosheets containing impurity levels (boron doping (BCN)) were prepared by a high-temperature solid-state reaction. Additionally, by anchoring the 3D dichalcogenide structures (CdIn2S4) elicited by a wet chemical route, hybrid BCN/CdIn2S4nanostructures were obtained. The resulting BCN/CdIn2S4(BCN–CIS3) nanostructures exhibited an excellent degradation efficiency (95%) for methyl orange (MO) compared to pristine g-C3N4nanosheets (CN) (28%) and boron-doped g-C3N4(BCN) (35%). All the optimized photocatalysts were thoroughly characterized using various techniques and investigated for comparative structural, optical, morphological, and catalytic properties. Our results reveal that introducing boron atoms into the lattice of g-C3N4nanosheets leads to reduction in the band-gap energy and rapid electron transfer. The formation of heterojunctions with the 3D CdIn2S4further assists in improving the degradation efficiency by minimizing the undesired electron–hole recombination, as confirmed by time-resolved photoluminescence (TRPL) analysis. This work proposes feasible strategies and their synergy to develop innovative materials for sustainable energy conversion and environmental remediation applications.

Published
2022
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12. Photoelectrochemical H 2 evolution on WO 3 /BiVO 4 enabled by single-crystalline TiO 2 overlayer modulations.

Author

Park E, Patil SS, Lee H, Kumbhar VS, and Lee K

Abstract

Tungsten oxide/bismuth vanadate (WO 3 /BiVO 4 ) has emerged as a promising photoanode material for photoelectrochemical (PEC) water splitting owing to its facilitated charge separation state differing significantly from single phase materials. Practical implementation of WO 3 /BiVO 4 is often limited by poor stability arising from the leaching of V 5+ from BiVO 4 during PEC operations. Herein, we demonstrate that the synthesis of a tungsten oxide/bismuth vanadate/titanium oxide (WO 3 /BiVO 4 /TiO 2 ) heterostructure onto a fluorine-doped tin oxide-coated glass substrate through a combined simple hydrothermal-spin coating strategy will advance PEC performance while slowing water oxidation kinetics and improving photostability. We show that surface postmodification with a nanometer-thick layer of (1 0 1) monofacet-selective single-crystalline TiO 2 provides stable photocurrent density, up to 1.04 mA cm -2 at 1.23 V (compared to a reversible hydrogen electrode in 0.5 M Na 2 SO 4 ), with excellent quantum efficiency (45% at 460 nm) and long-term photostability (24 h). Interestingly, crystalline TiO 2 activation layers behave differently from previous TiO 2 amorphous layers, blocking surface defects while improving corrosion resistance, photostability, and the electron transfer process. These results indicate a ≈2.5 times enhancement in photoelectrocatalytic activity related to referenced WO 3 /BiVO 4 photoanodes, encouraging the use of single-crystalline TiO 2 modulations to develop a range of materials for PEC/photocatalytic applications.

Published
2021
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