Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties

Abstract Efficient solar to hydrogen conversion using photoelectrochemical (PEC) process requires semiconducting photoelectrodes with advanced functionalities, while exhibiting high optical absorption and charge transport properties. Herein, we demonstrate magneto-tunable photocurrent in CoFe2O4 nan...

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Main Authors:	Simrjit Singh, Neeraj Khare
Format:	article
Language:	EN
Published:	Nature Portfolio 2018
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/6ae1291d293746d88826d66a9f11b7f4
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spelling	oai:doaj.org-article:6ae1291d293746d88826d66a9f11b7f42021-12-02T11:41:14ZLow field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties10.1038/s41598-018-24947-22045-2322https://doaj.org/article/6ae1291d293746d88826d66a9f11b7f42018-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-24947-2https://doaj.org/toc/2045-2322Abstract Efficient solar to hydrogen conversion using photoelectrochemical (PEC) process requires semiconducting photoelectrodes with advanced functionalities, while exhibiting high optical absorption and charge transport properties. Herein, we demonstrate magneto-tunable photocurrent in CoFe2O4 nanostructure film under low applied magnetic fields for efficient PEC properties. Photocurrent is enhanced from ~1.55 mA/cm2 to ~3.47 mA/cm2 upon the application of external magnetic field of 600 Oe leading to ~123% enhancement. This enhancement in the photocurrent is attributed to the reduction of optical bandgap and increase in the depletion width at CoFe2O4/electrolyte interface resulting in an enhanced generation and separation of the photoexcited charge carriers. The reduction of optical bandgap in the presence of magnetic field is correlated to the shifting of Co2+ ions from octahedral to tetrahedral sites which is supported by the Raman spectroscopy results. Electrochemical impedance spectroscopy results confirm a decrease in the charge transfer resistance at the CoFe2O4/electrolyte interface in the presence of magnetic field. This work evidences a coupling of photoexcitation properties with magnetic properties of a ferromagnetic-semiconductor and the effect can be termed as magnetophototronic effect.Simrjit SinghNeeraj KhareNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Simrjit Singh Neeraj Khare Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties
description	Abstract Efficient solar to hydrogen conversion using photoelectrochemical (PEC) process requires semiconducting photoelectrodes with advanced functionalities, while exhibiting high optical absorption and charge transport properties. Herein, we demonstrate magneto-tunable photocurrent in CoFe2O4 nanostructure film under low applied magnetic fields for efficient PEC properties. Photocurrent is enhanced from ~1.55 mA/cm2 to ~3.47 mA/cm2 upon the application of external magnetic field of 600 Oe leading to ~123% enhancement. This enhancement in the photocurrent is attributed to the reduction of optical bandgap and increase in the depletion width at CoFe2O4/electrolyte interface resulting in an enhanced generation and separation of the photoexcited charge carriers. The reduction of optical bandgap in the presence of magnetic field is correlated to the shifting of Co2+ ions from octahedral to tetrahedral sites which is supported by the Raman spectroscopy results. Electrochemical impedance spectroscopy results confirm a decrease in the charge transfer resistance at the CoFe2O4/electrolyte interface in the presence of magnetic field. This work evidences a coupling of photoexcitation properties with magnetic properties of a ferromagnetic-semiconductor and the effect can be termed as magnetophototronic effect.
format	article
author	Simrjit Singh Neeraj Khare
author_facet	Simrjit Singh Neeraj Khare
author_sort	Simrjit Singh
title	Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties
title_short	Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties
title_full	Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties
title_fullStr	Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties
title_full_unstemmed	Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties
title_sort	low field magneto-tunable photocurrent in cofe2o4 nanostructure films for enhanced photoelectrochemical properties
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/6ae1291d293746d88826d66a9f11b7f4
work_keys_str_mv	AT simrjitsingh lowfieldmagnetotunablephotocurrentincofe2o4nanostructurefilmsforenhancedphotoelectrochemicalproperties AT neerajkhare lowfieldmagnetotunablephotocurrentincofe2o4nanostructurefilmsforenhancedphotoelectrochemicalproperties
_version_	1718395402734010368

Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties

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