Heterogeneous interface-induced electrocatalytic efficiency boosting of bimetallic Cu/Zn selenides for stable water oxidation and oxygen reduction reactions

Velpandian, Muthuraja and Ummethala, Govind and Malladi, Sai Rama Krishna and Meduri, Praveen (2022) Heterogeneous interface-induced electrocatalytic efficiency boosting of bimetallic Cu/Zn selenides for stable water oxidation and oxygen reduction reactions. Catalysis Science & Technology. pp. 1-13. ISSN 2044-4753

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Abstract

An increased emphasis on alternative energy technologies paves the way for the design and development of highly active, cost-effective electrocatalysts for application in water splitting and fuel cells. In lieu of this, we evaluated heterostructured copper selenide and zinc selenide enwrapped in carbon nanofibers (CZSe@C-450) as bifunctional electrocatalysts synthesized by electrospinning and selenization. CZSe@C-450 demonstrated superior electrochemical performance with a low overpotential of 260 mV at 10 mA cm(-2), high stability (1.2% loss in 12 hours and 9.9% loss in 50 hours) for oxygen evolution reaction, a half-wave potential (E-1/2) of 0.88 V, and high stability (14.35% loss in 50 hours) for oxygen reduction reaction. The enhanced performance is attributed to the formation of a heterogeneous phase boundary between copper selenide and zinc selenide, which increases both the built-in potential and local atomic disorder. The lattice mismatch/disorder reduces the surface energy and leads to the creation of an ample number of active sites that participate in both oxygen evolution and reduction reactions.

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IITH Creators:

IITH Creators	ORCiD
Malladi, Sai Rama Krishna	https://orcid.org/0000-0002-0322-8137
Meduri, Praveen	https://orcid.org/0000-0002-2100-4209

Item Type:

Article

Additional Information:

We would like to thank the Indian Institute of Technology, Hyderabad for the financial support (under grant no. INTDEC/20-21/F148/ID-06) in conducting this research. Sairam K. Malladi would like to acknowledge the financial support of DST-SERB, India (under grant no. ECR/2017/002628) and DST-FIST program (under grant no. SR/FST/ETI421/2016). We would also like to thank the XRD and Raman facilities in the institute for their help.

Uncontrolled Keywords:

HYDROTHERMAL SYNTHESIS COPPER SELENI DEHYDROGEN NANO SHEETS EVOLUTION NIFEOXY HYDROXIDE NANO TUBE SELECT RODE CATALYST

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Chemical Engineering

Divisions:

Department of Chemical Engineering
Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

04 Aug 2022 15:01

Last Modified:

04 Aug 2022 15:01