Journal
ELECTROCHIMICA ACTA
Volume 344, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136052
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Funding
- CNPq [303351/2018-7, 405742/2018-5]
- Fundect -MS [59/300.184/2016]
- CAPES -PRINT [88881.311799/2018-01]
- PNPD -CAPES
- CAPES [88881.131904/2016-01]
- Sao Paulo Research Foundation (FAPESP) [2017/10118-0, 2019/04421-7]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior e Brazil (CAPES) [001]
- Estonian Research Council [PRG723]
- EU through the European Regional Development Fund [TK141]
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Oxygen reduction reaction (ORR) is greatly affected by the morphology as well as the elemental composition of the nitrogen-doped carbon-based electrocatalysts. Thus, this work focuses on: (i) nitrogen doping of different graphene-based materials (two-dimensional materials: chemically converted graphene, graphene oxide, and commercially available graphene, and one-dimensional material: graphene nanoribbons) that differ from each other by morphology as well as elemental composition and (ii) studying the ORR performance of these N-doped carbonaceous catalysts in alkaline medium. The nitrogen doping is achieved by low-cost synthetic method based on hydrothermal treatment at mild conditions. The results indicate that: (i) nitrogen doping is dependent on the carbonaceous substrate used and (ii) these N-doped graphene-based catalysts vary drastically by the electrocatalytic activity for ORR as well as the selectivity for HO2- and OH- production in alkaline medium. Roughly, predominantly was produced on two-dimensional graphene-based catalysts enriched with low nitrogen content (0.9-1.4 at.%) and mostly OH- was formed on graphene nanoribbons as one-dimensional catalyst containing low amount of nitrogen (2.1 at.%). This work is valuable for giving further insights to the ORR performance on N-doped graphene-based nanocarbons.
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