Gd active sites modulating the intermediate adsorption and activation in exfoliated gadolinium telluride for oxygen evolution and reduction reactions

Show simple item record

dc.contributor.author Nazir, Roshan
dc.contributor.author Kumbhakar, Partha
dc.contributor.author Agarwal, Sakshi
dc.contributor.author Parui, Arko
dc.contributor.author Roy, Soumyabrata
dc.contributor.author Ajayan, Pulickel M.
dc.contributor.author Singh, Abhishek K.
dc.contributor.author Sharma, Sudhanshu
dc.contributor.author Tiwary, Chandra Sekhar
dc.coverage.spatial United States of America
dc.date.accessioned 2024-08-23T10:25:16Z
dc.date.available 2024-08-23T10:25:16Z
dc.date.issued 2024-08
dc.identifier.citation Nazir, Roshan; Kumbhakar, Partha; Agarwal, Sakshi; Parui, Arko; Roy, Soumyabrata; Ajayan, Pulickel M.; Singh, Abhishek K.; Sharma, Sudhanshu and Tiwary, Chandra Sekhar, "Gd active sites modulating the intermediate adsorption and activation in exfoliated gadolinium telluride for oxygen evolution and reduction reactions", ACS Applied Engineering Materials, DOI: 10.1021/acsaenm.4c00415, Aug. 2024.
dc.identifier.issn 2771-9545
dc.identifier.uri https://doi.org/10.1021/acsaenm.4c00415
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/10361
dc.description.abstract This study reveals the synthesis of gadolinium telluride (Gd2Te3), a non-noble metal alloy with a two-dimensional (2D) morphology, for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). 2D Gd2Te3 exhibits promising electrocatalytic activity for OER with an onset potential of 1.335 V vs RHE (η = 105 mV) and an overpotential of 1.459 V vs RHE (η = 229 mV) at 10 mA/cm2, rivalling benchmark catalysts such as IrO2 and RuO2. Gd2Te3 exhibited a large turnover frequency of 3.7 s–1 (at η = 420 mV) and a mass activity of 18.69 Ag1– (at η = 470 mV). The chronoamperometric durability studies revealed a consistent current density (>20 mA cm–2) for 8 h at 1.65 V, reflecting good electrocatalytic stability of the material. The competitive OER activity of 2D Gd2Te3 can be attributed to better valence and conduction band edge alignment with water oxidation–reduction levels that is also corroborated by density functional theory (DFT) studies. 2D Gd2Te3 also exhibited good ORR performance exhibiting an onset potential of 0.72 V vs RHE at 0.1 mA cm–2. The number of electron transfers, calculated from H2O2 percentages between 0.30 and 0.50 V vs RHE, revealed that Gd2Te3 follows the 4e– ORR pathway with OH– as the major intermediate product. Using DFT calculations, we further elucidate the role and importance of Gd in stabilizing and destabilizing the intermediates that reduce the overpotentials for both the OER and ORR.
dc.description.statementofresponsibility by Roshan Nazir, Partha Kumbhakar, Sakshi Agarwal, Arko Parui, Soumyabrata Roy, Pulickel M. Ajayan, Abhishek K. Singh, Sudhanshu Sharma and Chandra Sekhar Tiwary
dc.language.iso en_US
dc.publisher American Chemical Society
dc.subject Gadolinium telluride
dc.subject 2D material
dc.subject Non-noble metal alloy
dc.subject Oxygen evolution reaction
dc.subject Oxygen reduction reaction
dc.subject 4e-ORR pathway
dc.subject Density functional theory
dc.title Gd active sites modulating the intermediate adsorption and activation in exfoliated gadolinium telluride for oxygen evolution and reduction reactions
dc.type Article
dc.relation.journal ACS Applied Engineering Materials


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Digital Repository


Browse

My Account