MAX Phase (Nb4AlC3) For Electrocatalysis Applications

Author:

Gandara Meriene1ORCID,Mladenović Dušan2,Oliveira Martins Marta de Jesus3ORCID,Rakocevic Lazar34ORCID,Kruszynski de Assis João Marcos5ORCID,Šljukić Biljana23ORCID,Sarmento Gonçalves Emerson15ORCID

Affiliation:

1. Technological Institute of Aviation Space Science and Technology Graduate Program Praça Marechal Eduardo Gomes São José dos Campos 50 e 12228–615 Brazil

2. University of Belgrade Faculty of Physical Chemistry Studentski trg 12–16 Belgrade 11158 Serbia

3. Center of Physics and Engineering of Advanced Materials Laboratory for Physics of Materials and Emerging Technologies Chemical Engineering Department Instituto Superior Técnico Universidade de Lisboa Lisbon 1049‐001 Portugal

4. Vinča Institute of Nuclear Sciences Department of Atomic Physics 12–14 Mike Petrovića Street Belgrade 11351 Serbia

5. Institute of Aeronautics and Space Materials Division Praça Marechal Eduardo Gomes São José dos Campos 50 e 12228–904 Brazil

Abstract

AbstractIn search for novel materials to replace noble metal‐based electrocatalysts in electrochemical energy conversion and storage devices, special attention is given to a distinct class of materials, MAX phase that combines advantages of ceramic and metallic properties. Herein, Nb4AlC3 MAX phase is prepared by a solid‐state mixing reaction and characterized morphologically and structurally by transmission and scanning electron microscopy with energy‐dispersive X‐ray spectroscopy, nitrogen‐sorption, X‐ray diffraction analysis, X‐ray photoelectron and Raman spectroscopy. Electrochemical performance of Nb4AlC3 in terms of capacitance as well as for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is evaluated in different electrolytes. The specific capacitance Cs of 66.4, 55.0, and 46.0 F g−1 at 5 mV s−1 is determined for acidic, neutral and alkaline medium, respectively. Continuous cycling reveals high capacitance retention in three electrolyte media; moreover, increase of capacitance is observed in acidic and neutral media. The electrochemical impedance spectroscopy showed a low charge transfer resistance of 64.76 Ω cm2 that resulted in better performance for HER in acidic medium (Tafel slope of 60 mV dec−1). In alkaline media, the charge storage value in the double layer is 360 mF cm−2 (0.7 V versus reversible hydrogen electrode) and the best ORR performance of the Nb4AlC3 is achieved in this medium (Tafel slope of 126 mV dec−1).

Funder

Fundação para a Ciência e a Tecnologia

Financiadora de Estudos e Projetos

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Fundação de Amparo à Pesquisa do Estado de São Paulo

Publisher

Wiley

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