Volume 20, Issue 35 2400012
Research Article

Aluminium, Nitrogen-Dual-Doped Reduced Graphene Oxide Co-Existing with Cobalt-Encapsulated Graphitic Carbon Nanotube as an Activity Modulated Electrocatalyst for Oxygen Electrocatalyst for Oxygen Electrochemistry Applications

Geeta Pandurang Kharabe

Geeta Pandurang Kharabe

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

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Sidharth Barik

Sidharth Barik

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

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Sudheesh Kumar Veeranmaril

Sudheesh Kumar Veeranmaril

Physical Sciences and Engineering Division (PSE), KAUST Catalysis Centre (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955 Saudi Arabia

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Aathira Nair

Aathira Nair

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

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Rajith Illathvalappil

Rajith Illathvalappil

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

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Athira Yoyakki

Athira Yoyakki

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

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Kavita Joshi

Corresponding Author

Kavita Joshi

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

E-mail: [email protected]; [email protected]; [email protected]

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Chathakudath Prabhakaran Vinod

Corresponding Author

Chathakudath Prabhakaran Vinod

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

Catalysis and Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

E-mail: [email protected]; [email protected]; [email protected]

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Sreekumar Kurungot

Corresponding Author

Sreekumar Kurungot

Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

E-mail: [email protected]; [email protected]; [email protected]

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First published: 23 April 2024
Citations: 7

Abstract

There is a rising need to create high-performing, affordable electrocatalysts in the new field of oxygen electrochemistry. Here, a cost-effective, activity-modulated electrocatalyst with the capacity to trigger both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in an alkaline environment is presented. The catalyst (Al, Co/N-rGCNT) is made up of aluminium, nitrogen-dual-doped reduced graphene oxide sheets co-existing with cobalt-encapsulated carbon nanotube units. Based on X-ray Absorption Spectroscopy (XAS) studies, it is established that the superior reaction kinetics in Al, Co/N-rGCNT over their bulk counterparts can be attributed to their electronic regulation. The Al, Co/N-rGCNT performs as a versatile bifunctional electrocatalyst for zinc-air battery (ZAB), delivering an open circuit potential ≈1.35 V and peak power density of 106.3 mW cm−2, which are comparable to the system based on Pt/C. The Al, Co/N-rGCNT-based system showed a specific capacity of 737 mAh gZn−1 compared to 696 mAh gZn−1 delivered by the system based on Pt/C. The DFT calculations indicate that the adsorption of Co in the presence of Al doping in NGr improves the electronic properties favoring ORR. Thus, the Al, Co/N-rGCNT-based rechargeable ZAB (RZAB) emerges as a highly viable and affordable option for the development of RZAB for practical applications.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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