Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation

Soumadri Samanta; Sunil Kumar; V. R. Battula; Arpna Jaryal; Neha Sardana; Kamalakannan Kailasam

doi:10.1039/d0ra03773g

Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation

Soumadri Samanta, Sunil Kumar, V. R. Battula, Arpna Jaryal, Neha Sardana, Kamalakannan Kailasam

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Metal-free organic polymer photocatalysts have attracted dramatic attention in the field of visible light-induced hydrogen evolution reaction (HER). Herein, we showed a polymeric O-linked heptazine polymer (OLHP) decorated with S, N co-doped graphene quantum dots (S,N-GQDs) as a photosensitizer to generate hydrogen upon quantum dot sensitization. Both of these heptazine-based systems show effective photosensitization with strong π-π interactions and enhanced photocatalytic H2 generation (24 times) as metal-free systems. Electrochemical impedance and optical measurements show effective charge transfer kinetics with decreased charge recombination, which is responsible for the enhanced photocatalytic activity. As a result, a significant high apparent quantum yield (AQY) with highest value of 10.2% was obtained for our photocatalyst OLHP/S,N-GQD10.

Original language	English
Pages (from-to)	29633-29641
Number of pages	9
Journal	RSC Advances
Volume	10
Issue number	50
DOIs	https://doi.org/10.1039/d0ra03773g
State	Published - 11 Aug 2020
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/d0ra03773g

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title = "Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation",

abstract = "Metal-free organic polymer photocatalysts have attracted dramatic attention in the field of visible light-induced hydrogen evolution reaction (HER). Herein, we showed a polymeric O-linked heptazine polymer (OLHP) decorated with S, N co-doped graphene quantum dots (S,N-GQDs) as a photosensitizer to generate hydrogen upon quantum dot sensitization. Both of these heptazine-based systems show effective photosensitization with strong π-π interactions and enhanced photocatalytic H2 generation (24 times) as metal-free systems. Electrochemical impedance and optical measurements show effective charge transfer kinetics with decreased charge recombination, which is responsible for the enhanced photocatalytic activity. As a result, a significant high apparent quantum yield (AQY) with highest value of 10.2% was obtained for our photocatalyst OLHP/S,N-GQD10.",

author = "Soumadri Samanta and Sunil Kumar and Battula, {V. R.} and Arpna Jaryal and Neha Sardana and Kamalakannan Kailasam",

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AU - Samanta, Soumadri

AU - Kumar, Sunil

AU - Battula, V. R.

AU - Jaryal, Arpna

AU - Sardana, Neha

AU - Kailasam, Kamalakannan

PY - 2020/8/11

Y1 - 2020/8/11

N2 - Metal-free organic polymer photocatalysts have attracted dramatic attention in the field of visible light-induced hydrogen evolution reaction (HER). Herein, we showed a polymeric O-linked heptazine polymer (OLHP) decorated with S, N co-doped graphene quantum dots (S,N-GQDs) as a photosensitizer to generate hydrogen upon quantum dot sensitization. Both of these heptazine-based systems show effective photosensitization with strong π-π interactions and enhanced photocatalytic H2 generation (24 times) as metal-free systems. Electrochemical impedance and optical measurements show effective charge transfer kinetics with decreased charge recombination, which is responsible for the enhanced photocatalytic activity. As a result, a significant high apparent quantum yield (AQY) with highest value of 10.2% was obtained for our photocatalyst OLHP/S,N-GQD10.

AB - Metal-free organic polymer photocatalysts have attracted dramatic attention in the field of visible light-induced hydrogen evolution reaction (HER). Herein, we showed a polymeric O-linked heptazine polymer (OLHP) decorated with S, N co-doped graphene quantum dots (S,N-GQDs) as a photosensitizer to generate hydrogen upon quantum dot sensitization. Both of these heptazine-based systems show effective photosensitization with strong π-π interactions and enhanced photocatalytic H2 generation (24 times) as metal-free systems. Electrochemical impedance and optical measurements show effective charge transfer kinetics with decreased charge recombination, which is responsible for the enhanced photocatalytic activity. As a result, a significant high apparent quantum yield (AQY) with highest value of 10.2% was obtained for our photocatalyst OLHP/S,N-GQD10.

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Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation

Abstract

ASJC Scopus subject areas

UN SDGs

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