Ramesh, Chodipilli and Tyagi, Prashant and Aggarwal, Vishnu and Pal, Samanta and Dhua, Swati and Singh, Manjari and Pal, Prabir and Roy, Somnath C and Singh, Surinder P and Muthusamy, Senthil Kumar and Kushvaha, Sunil Singh (2023) Hybrid Reduced Graphene Oxide/GaN Nanocolumns on Flexible Niobium Foils for Efficient Photoelectrochemical Water Splitting. ACS Applied Nano Materials, 6 (3). pp. 1898-1909. ISSN 2574-0970

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Abstract

We present the photoelectrochemical (PEC) water-splitting properties of pristine and reduced graphene oxide (rGO)-coated GaN nanocolumns (NCs) on flexible niobium (Nb) metal foils. The structural, optical, and electronic structure analyses of rGO-coated GaN-NCs on Nb foils revealed the formation of a rGO/GaN-NCs hybrid structure. Further, the valence-band studies of pure GaN-NCs shows valence-band maxima at similar to 3.0 eV below the Fermi level, which decreased to similar to 2.8 eV for rGO/GaN-NCs. The PEC measurement performed on pristine GaN-NCs under standard (1 Sun) conditions shows an effective photocatalytic nature with a photocurrent density of similar to 60 mu A/cm2 at 0.8 V (vs Ag/AgCl) in a 1 M oxalic acid electrolyte, which increases to similar to 110 mu A/cm2 for rGO/ GaN-NCs. The efficient PEC characteristics of rGO/GaN-NCs are attributed to the effective charge separation/transport of photogenerated carriers. Furthermore, transient photocurrent measurement reveals that hybrid and pristine GaN-NCs on flexible metal foil have a fast and stable photoresponse in an aqueous solution. The development of a hybrid nitride nanostructure-based PEC device on flexible metal foils paves the way toward developing scalable PEC devices for hydrogen production applications.

Item Type:	Article
Subjects:	Electronics
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	29 Sep 2023 10:54
Last Modified:	29 Sep 2023 10:54
URI:	http://cgcri.csircentral.net/id/eprint/5557

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