CuO/CuBi2O4 heterojunction photocathode: High stability and current densities for solar water splitting

Pulipaka, Supriya and Boni, Nikhila and Ummethala, Govind and Meduri, Praveen (2020) CuO/CuBi2O4 heterojunction photocathode: High stability and current densities for solar water splitting. Journal of Catalysis, 387. pp. 17-27. ISSN 00219517

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Abstract

Global energy crisis escalates the emphasis on ways to find green and sustainable solutions. Photoelectrochemical (PEC) conversion is one of the key technologies to fulfill the energy demand by converting solar energy into chemical fuels. Binary copper oxides suffer from severe photocorrosion and ternary copper oxides such as copper bismuth oxide (CuBi2O4) exhibit poor charge separation and transfer. In this work, a composite consisting of CuO annealed at 450 °C and CBO electrodeposited for 5 min on top of it (CuO-450/CBO-5) showed the best performance with a positive shift of 0.2 V in onset potential, a high current density of −0.9 mA cm−2 at 0.1 V vs RHE and high stability over pure CuO. The systematic deposition of CBO on CuO leads to intimate contact between the two semiconductors wherein, CuO acts as a hole carrier and CBO accommodates the hydrogen evolution reaction (HER).

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IITH Creators:

IITH Creators	ORCiD
Pulipaka, Supriya	UNSPECIFIED
Boni, Nikhila	UNSPECIFIED
Ummethala, Govind	UNSPECIFIED
Meduri, Praveen	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Charge separations; High current densities; Key technologies; Onset potential; Photoelectrochemicals; Positive shift; Solar water splitting; Sustainable solution;Bismuth compounds; Energy policy; Heterojunctions; Photoelectrochemical cells; Solar energy

Subjects:

Chemical Engineering

Divisions:

Department of Chemical Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

07 Aug 2021 04:52

Last Modified:

07 Aug 2021 04:52

URI:

http://raiithold.iith.ac.in/id/eprint/8720