Thin-film material libraries in the ternary and quaternary metal oxide systems Fe–V–O, Cu–V–O, and Cu–Fe–V–O were synthesized using combinatorial reactive co-sputtering with subsequent annealing in air. Their compositional, structural, and functional properties were assessed using high-throughput characterization methods. Prior to the investigation of the quaternary system Cu–Fe–V–O, the compositions (Fe61V39)Ox and (Cu52V48)Ox with promising photoactivity were identified from their ternary subsystems Fe–V–O and Cu–V–O, respectively. Two Cu–Fe–V–O material libraries with (Cu29-72Fe4-27V22-57)Ox and (Cu11-55Fe27-73V12-34)Ox composition spread were investigated. Seven mixed ternary and quaternary phase regions were identified: I (α-Cu3FeV6O26/FeVO4), II (Cu5V2O10/FeVO4/α-Cu3Fe4V6O26), III (Cu5V2O10), IV (Cu5V2O10/FeVO4, V (FeVO4/γ-Cu2V2O7/α-Cu3Fe4V6O26), VI (β-Cu2V2O7/α-Cu3Fe4V6O26/FeVO4), and VII (β-Cu3Fe4V6O26/FeVO4). In the investigated composition range, two photoactive regions, (Cu53Fe7V40)Ox and (Cu45Fe21V34)Ox, were identified, exhibiting 103 μA/cm2 and 108 μA/cm2 photocurrent density for the oxygen evolution reaction at 1.63 V vs reversible hydrogen electrode, respectively. The highest photoactive region (Cu45Fe21V34)Ox comprises the dominant α-Cu3Fe4V6O24 phase and minor FeVO4 phase. This photoactive region corresponds to having an indirect bandgap of 1.87 eV and a direct bandgap of 2.58 eV with an incident photon-to-current efficiency of 30% at a wavelength of 310 nm.
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7 July 2020
Research Article|
July 07 2020
Structural and photoelectrochemical properties in the thin film system Cu–Fe–V–O and its ternary subsystems Fe–V–O and Cu–V–O
Special Collection:
Photocatalysis and Photoelectrochemistry
Swati Kumari
;
Swati Kumari
1
Materials Discovery and Interfaces (MDI), Institute for Materials, Faculty of Mechanical Engineering, Ruhr University Bochum
, D-44801 Bochum, Germany
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João R. C. Junqueira
;
João R. C. Junqueira
2
Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum
, D-44801 Bochum, Germany
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Suchismita Sarker;
Suchismita Sarker
3
Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
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Apurva Mehta
;
Apurva Mehta
3
Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
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Wolfgang Schuhmann
;
Wolfgang Schuhmann
2
Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum
, D-44801 Bochum, Germany
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Alfred Ludwig
Alfred Ludwig
a)
1
Materials Discovery and Interfaces (MDI), Institute for Materials, Faculty of Mechanical Engineering, Ruhr University Bochum
, D-44801 Bochum, Germany
a)Author to whom correspondence should be addressed: alfred.ludwig@rub.de
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a)Author to whom correspondence should be addressed: alfred.ludwig@rub.de
Note: This paper is part of the JCP Special Topic on Photocatalysis and Photoelectrochemistry.
J. Chem. Phys. 153, 014707 (2020)
Article history
Received:
April 01 2020
Accepted:
June 09 2020
Citation
Swati Kumari, João R. C. Junqueira, Suchismita Sarker, Apurva Mehta, Wolfgang Schuhmann, Alfred Ludwig; Structural and photoelectrochemical properties in the thin film system Cu–Fe–V–O and its ternary subsystems Fe–V–O and Cu–V–O. J. Chem. Phys. 7 July 2020; 153 (1): 014707. https://doi.org/10.1063/5.0009512
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