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Ni-Based Composites from Chitosan Biopolymer a One-Step Synthesis for Oxygen Evolution Reaction

AuthorsAghabarari, Behzad; Luque-Centeno, José Manuel; Capel-Sánchez, Maricarmen; Lázaro Elorri, Maria Jesús ; Martínez-Huerta, Maria Victoria
Issue Date21-May-2019
PublisherMultidisciplinary Digital Publishing Institute
CitationCatalysts 9 (5): 471 (2019)
AbstractCost-efficient and sustainable electrocatalysts for oxygen evolution reaction (OER) is highly desired in the search for clean and renewable energy sources. In this study, we develop a new one-step synthesis strategy of novel composites based on Ni and molybdenum carbide embedded in N- and P-dual doped carbon matrices using mainly chitosan biopolymer as the carbon and nitrogen source, and molybdophosphoric acid (HMoP) as the P and Mo precursor. Two composites have been investigated through annealing a mixture of Ni/chitosan and HMoP with two unlike carbon matrices, melamine and graphene oxide, at a high temperature. Both composites exhibit similar multi-active sites with high electrocatalytic activity for OER in an alkaline medium, which is comparable to the IrO<sub>2</sub> catalyst. For this study, an accurate measurement of the onset potential for O<sub>2</sub> evolution has been used by means of a rotating ring-disk electrode (RRDE). The use of this method allows confirming a better stability in the chitosan/graphene composite. This work serves as a promising approach for the conversion of feedstock and renewable chitosan into desired OER catalysts.
Identifiersdoi: 10.3390/catal9050471
Appears in Collections:Colección MDPI
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