Hierarchical metal–semiconductor–graphene ternary heteronanostructures for plasmon-enhanced wide-range visible-light photocatalysis

Jung, Ha Yoon; Song, J. J.; Lee, Seung‐Hoon; Lee, Young-Wook; Wi, Dae Han; Goo, Bon Seung; Han, Sang Woo

doi:10.1039/c9ta03934a

Cited by 27 publications

(25 citation statements)

References 73 publications

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“…Two symmetrical peaks corresponding to Ti 2p 3/2 (458.6 eV) and Ti 2p 1/2 (464.3 eV) are observed, validating the presence of Ti 4+ in all of the samples. 34 The O 1s XPS patterns (Figure 5b) display two peaks at 529.9 and 531.3 eV, which are ascribed to lattice O (Ti−O) and hydroxyl O (−OH), respectively. 35,36 The binding energies of Ti 2p and O 1s for CVDG-TiO 2 are similar to that of the RGO-TiO 2 composite, suggesting the same electronic interactions between TiO 2 and graphene (CVDG and RGO).…”

Section: Resultsmentioning

confidence: 99%

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO₂ Composites

Huang

Wang

et al. 2021

ACS Appl. Energy Mater.

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Construction of graphene-based composites has been a popular theme in solar energy harvesting and conversion, yet the understanding of the real efficacy of graphene for enhancing photocatalytic efficiency is hampered by the gap of physicochemical properties between the defined graphene and the graphene used in research laboratories. Here, we purposely synthesize a high-quality chemical vapor deposition graphene (CVDG) as a model material to integrate with TiO 2 , which demonstrates that photocatalytic performance can be greatly improved by controlling the quality of graphene. Under the same reaction conditions, the as-prepared CVDG-TiO 2 displays a 26.2-times and 10-times higher photocatalytic hydrogen evolution activity than bare TiO 2 and its counterpart, reduced graphene oxide (RGO)-TiO 2 , respectively. Experimental characterization reveals that the few-layer CVDG with a low defect density is able to better unleash the excellent electrical conductivity potential of graphene, by which the separation and lifetime of photoexcited charge carriers of graphene-TiO 2 could be improved more efficiently. The research highlights the significant effect of the quality of graphene for the construction of more efficient semiconductor-graphene composites, which is anticipated to inform ongoing efforts on exploiting high-quality graphene to advance solar energy harvesting and conversion.

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Section: Resultsmentioning

confidence: 99%

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO₂ Composites

Huang

Wang

et al. 2021

ACS Appl. Energy Mater.

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“…However, excessive RGO sheets beyond 50% caused the decrease in the J st , as a less amount of Na 2 Ti 3 O 7 was involved in the photoanode. Compared with similar photoelectrocatalytic systems (summarized in Table S1), − the RGO/Na 2 Ti 3 O 7 have enhanced photoelectrochemical performance.…”

Section: Resultsmentioning

confidence: 99%

Graphene-Based Modulation on the Growth of Urchin-like Na₂Ti₃O₇ Microspheres for Photothermally Enhanced H₂ Generation from Ammonia Borane

Sun

et al. 2020

ACS Appl. Nano Mater.

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Structural optimization and surface engineering of photocatalysts are considered as promising approaches to improve their performances effectively. The precise control of morphology and compositions during synthesis of photocatalysts is important but yet challenging. In this work, without any aid of surfactant, urchin-like reduced graphene oxide/sodium titanate (RGO/ Na 2 Ti 3 O 7 ) microspheres were fabricated by a facile, one-pot hydrothermal reaction with good reproducibility. Both microsized and nanosized graphene oxide sheets can serve as catalysts of manipulating the growth kinetics of urchin-like Na 2 Ti 3 O 7 microspheres by accelerating nucleation while inhibiting Ostwald ripening. The coupling of hierarchical Na 2 Ti 3 O 7 with RGO significantly enhanced photoelectrochemical and photocatalytic performances under visible-light irradiation. The steady-state photocurrent density of RGO/Na 2 Ti 3 O 7 -based photoanode was 13.6 times higher than those based on pristine Na 2 Ti 3 O 7 , thanks to the narrowed bandgap, enhanced light harvesting, and effective electron transfer. The surfactant-free RGO/Na 2 Ti 3 O 7 microspheres were further demonstrated as photocatalysts endowed with photothermal effect enhanced photocatalytic activity. Toward H 2 generation by hydrolysis of ammonia borane, the maximum hydrogen production rate of RGO/Na 2 Ti 3 O 7 reached 2.73 times higher than that of Na 2 Ti 3 O 7 , mainly due to the excellent photothermal efficiency up to 67.2% (higher than that of noble metal, e.g., Au dumbbell-like structure). It is believed that our understanding and reliable strategy could be extendable to construct new photocatalysts and systems toward effective solar energy harvesting and utilizations.

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“…It has been reported that the plasmon‐induced resonant energy transfer and the radiative relaxation of LSPR are possible mechanisms for the plasmon energy transfer 6,9,10 . The hot electron transfer mechanism, which has been known as the dominant pathway of plasmon energy transfer in plasmonic metal–semiconductor heteronanostructures, 11–13 is ineffective in the case of YSNs due to the absence of intimate contact between the semiconductor and the metal. To facilitate the above processes, the spectral overlap between the LSPR of the plasmonic metal and the band gap absorption of the semiconductor is essential 10 .…”

Section: Figurementioning

confidence: 99%

Ag‐CdS Yolk–Shell Heteronanostructures for Plasmon‐Enhanced Photocatalysis

Jung

Whang

Han

2021

Bulletin Korean Chem Soc

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The combination of a semiconductor and a plasmonic metal holds great promise for developing advanced photocatalysts. However, the realization of a heteronanostructure that accommodates both materials in an effective way has been a great challenge. Herein, we report a synthesis of a photocatalyst with a yolkshell heteronanostructure, which contains a plasmonic Ag yolk inside a CdS shell. The sulfidation of Ag nanospheres followed by a controlled cation exchange reaction successfully generated the Ag-CdS yolkshell nanostructures. The as-prepared heteronanostructures exhibited a prominent enhancement of photocatalytic activity toward hydrogen evolution reaction under visible-light irradiation compared to CdS hollow nanoparticles without the Ag yolk. This improvement can be attributed to the plasmon energy transfer from the Ag yolk to the CdS shell and the yolk-shell structure that enables the multiple reflections of the incident light.

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Hierarchical metal–semiconductor–graphene ternary heteronanostructures for plasmon-enhanced wide-range visible-light photocatalysis

Abstract: A high-performance wide-range visible-light photocatalysis platform was constructed from the intimate coupling of morphology-controlled plasmonic metal nanocrystals, a semiconductor, and graphene in a controlled manner.

Cited by 27 publications

References 73 publications

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO₂ Composites

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO₂ Composites

Graphene-Based Modulation on the Growth of Urchin-like Na₂Ti₃O₇ Microspheres for Photothermally Enhanced H₂ Generation from Ammonia Borane

Ag‐CdS Yolk–Shell Heteronanostructures for Plasmon‐Enhanced Photocatalysis

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Hierarchical metal–semiconductor–graphene ternary heteronanostructures for plasmon-enhanced wide-range visible-light photocatalysis

Abstract: A high-performance wide-range visible-light photocatalysis platform was constructed from the intimate coupling of morphology-controlled plasmonic metal nanocrystals, a semiconductor, and graphene in a controlled manner.

Cited by 27 publications

References 73 publications

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO2 Composites

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO2 Composites

Graphene-Based Modulation on the Growth of Urchin-like Na2Ti3O7 Microspheres for Photothermally Enhanced H2 Generation from Ammonia Borane

Ag‐CdS Yolk–Shell Heteronanostructures for Plasmon‐Enhanced Photocatalysis

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Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO₂ Composites

Insight into the Real Efficacy of Graphene for Enhancing Photocatalytic Efficiency: A Case Study on CVD Graphene-TiO₂ Composites

Graphene-Based Modulation on the Growth of Urchin-like Na₂Ti₃O₇ Microspheres for Photothermally Enhanced H₂ Generation from Ammonia Borane