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- Lellala, KashinathLuleå tekniska universitet,Materialvetenskap,Centre for Materials Science and Technology, University of Mysore, Mysore, India (author)
Ceria Boosting on In Situ Nitrogen-Doped Graphene Oxide for Efficient Bifunctional ORR/OER Activity
- Article/chapterEnglish2022
Publisher, publication year, extent ...
- 2022-06-24
- Frontiers Media S.A.2022
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:ltu-92081
- https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-92081URI
- https://doi.org/10.3389/fchem.2022.889579DOI
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- Language:English
- Summary in:English
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- Validerad;2022;Nivå 2;2022-07-06 (sofila)
- In the present work, a highly efficient and excellent electrocatalyst material for bifunctional oxygen reduction/evolution reaction (ORR/OER) was synthesized using the microwave-assisted hydrothermal method. In brief, ultrafine hexagonal cerium oxide (CeO2) nanoparticles were tailored on the layered surface of in situ nitrogen-doped graphene oxide (NGO) sheets. The nanocomposites exhibited a high anodic onset potential of 0.925 V vs. RHE for ORR activity and 1.2 V for OER activity with a very high current density in 0.5 M KOH. The influence of oxygen cluster on Ce3+/Ce4+ ion decoration on outward/inward in situ nitrogen-coupled GO enhanced the physicochemical properties of composites and in turn increased electron transferability. The microwave-assisted hydrothermal coupling technique provides a higher density, active sites on CeO2@NGO composites, and oxygen deficiency structures in ultrafine Ce-O particles and boosts higher charge transferability in the composites. It is believed that the physical states of Ce-N- C, Ce-C=O, and a higher amount of oxygen participation with ceria increase the density of composites that in turn increases the efficiency. N-doped graphene oxide promotes high current conduction and rapid electron transferability while reducing the external transport resistance in oxygen electrocatalysis by sufficient mass transfer through in-built channels. This study may provide insights into the knowledge of Ce-enabled bifunctional activity to guide the design of a robust catalyst for electrochemical performance.
Subject headings and genre
- NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
- OER
- ORR (oxygen reduction reaction)
- electrocatalyst
- heterostructures
- microwave
- Experimentell fysik
- Experimental Physics
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- Byrappa, K.Centre for Materials Science and Technology, University of Mysore, Mysore, India; Adichunchanagiri University, Mandya, India (author)
- Luleå tekniska universitetMaterialvetenskap (creator_code:org_t)
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- In:Frontiers in Chemistry: Frontiers Media S.A.102296-2646
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