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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nickel pyrophosphate combined with graphene nanoribbon used as efficient catalyst for OER

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Author(s):
Souza, Alan S. [1] ; Bezerra, Leticia S. [1] ; Cardoso, Eduardo S. F. [1] ; Fortunato, Guilherme V. [2, 1] ; Maia, Gilberto [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Mato Grosso do Sul, Inst Chem, Ave Senador Filinto Muller 1555, BR-79074460 Campo Grande, MS - Brazil
[2] Univ Sao Paulo, Inst Chem Sao Carlos, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF MATERIALS CHEMISTRY A; v. 9, n. 18, p. 11255-11267, MAY 14 2021.
Web of Science Citations: 0
Abstract

Although noble-metal based materials (IrO2 and RuO2) are regarded state-of-the-art catalysts for oxygen evolution reaction (OER), their high price, long-term instability, and scarcity have fueled the search for alternative materials that are relatively cheaper and highly abundant in nature and which can be used for the development of electrolyzers that are suitable for hydrogen production. The present work reports the development and application of a new hybrid catalyst derived from the thermal treatment of a mixture of graphene nanoribbons (GNR) and nickel pyrophosphate (beta-Ni2P2O7); the proposed hybrid material was found to present remarkably improved properties which include easy charge transfer, high electroactive surface area, high activity, and effective resistance to corrosion in OER in alkaline medium. The combination of highly dispersed beta-Ni2P2O7-30 wt% in direct contact with GNR-70 wt%, coupled with the application of thermal treatment - which ensured some enrichment of Ni in the GNiPy350N catalyst, contributed toward the production of an efficient material with excellent and stable OER activity in alkaline conditions. Compared to the state-of-the-art IrO2 (300 mV), the GNiPy350N catalyst required an overpotential of approximately 320 mV to reach the current density of 10 mA cm(-2) when immobilized on carbon paper electrode. (AU)

FAPESP's process: 19/04421-7 - Production and characterization of metal-graphene or graphene oxide nanocomposites for the electrocatalytic production of hydrogen peroxide: Application to the degradation of endocrine disrupting chemicals by electrochemical advanced oxidation processes
Grantee:Guilherme Vilalba Fortunato
Support Opportunities: Scholarships in Brazil - Post-Doctoral