resumo
This work explores the possibilities for the processing of Ni- and Ti3C2Tx (T = OH, O) MXene-containing composite electrodes, by co-pressing and plastic deformation or by etching of the electrodes prepared directly by self-propagation high-temperature synthesis (SHS). Various material design approaches were also explored. In order to tune the Ti3C2 interlayer distance in Ti3C2Al MAX phase, an introduction of additional Al to form Ti3C2Alz materials with z > 1 was attempted. Self-propagation high-temperature synthesis of powder mixtures with extra Ni and Al content (e.g. Ni:Ti:Al:C = 1:2:3:1) resulted in SHS products containing Ti3C2Alz z > 1 material and Ni-Al alloys. Further etching of these products in 10M NaOH allowed the direct formation of electrodes with active surface containing Ti3C2Tx (T = OH, O) MXene- and Raney nickel-containing composites. The electrochemical studies were focused on hydrogen evolution and showed the potential for boosting the electrochemical reaction in Ni and MXene-containing composite electrodes, especially at high current densities. The guidelines for the processing of such electrodes under fluorine-free conditions are proposed and discussed. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
categoria
Chemistry, Physical; Electrochemistry; Energy & Fuels
autores
Sergiienko, SA; Lopes, DV; Constantinescu, G; Ferro, MC; Shchaerban, ND; Tursunov, OB; Shkepu, VI; Pazniak, H; Tabachkova, NY; Castellon, ER; Frade, JR; Kovalevsky, AV
nossos autores
Andrei Kavaleuski
Investigador principal
Daniela Vanessa Rosendo Lopes
Investigador Júnior
Gabriel Constantinescu
Investigador
Jorge Ribeiro Frade
Professor(a) Jubilado(a)
Marta Ascenção Carmona Ferro
Técnico de Laboratório
Sergii Sergiienko
Investigador JúniorProjectos
SusPhotoSolutions - Soluções Fotovoltaicas Sustentáveis (SUSPHOTOSOLUTIONS)
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
agradecimentos
The authors acknowledge the support within the projects SusPhotoSolutions - Solucoes Fotovoltaicas Sustentaveis (CENTRO-01-0145-FEDER-000005) and CICECO-Aveiro Institute of Materials (ref. UIDB/50011/2020 & UIDP/50011/2020), financed by COMPETE 2020 Program and National Funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. The support of the European Commission project SIDERWIN (SIDERWINDLV-768788-Horizon 2020/SPIRE10) is also acknowledged. E.R.C. thanks to project RTI2018-099668-BC22 of Ministerio de Ciencia, Innovacion y Universidades and FEDER.