Trimetallic Nanoalloy of NiFeCo Embedded in Phosphidated Nitrogen Doped Carbon Catalyst for Efficient Electro-Oxidation of Kraft Lignin

Recently, electro-oxidation of kraft lignin has been reported as a prominent electrochemical reaction to generate hydrogen at lower overpotential in alkaline water electrolysis. However, this reaction is highly limited by the low performance of existing electrocatalysts. Herein, we report a novel ye...

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Bibliographic Details
Published in:Polymers 2022-09, Vol.14 (18), p.3781
Main Authors: Honorato, Ana Maria Borges, Khalid, Mohmmad, Curvelo, Antonio Aprigio da Silva, Varela, Hamilton, Shahgaldi, Samaneh
Format: Article
Language:English
Subjects:
Ammonia
Carbon
Catalysts
Chemical synthesis
Electrocatalysts
Electrolysis
Hydrogen
Hydrogen as fuel
Hydrogen production
Lignin
Methanol
Nanoalloys
Nitrogen
Oxidation
Oxidation-reduction reaction
Oxygen evolution reactions
Production processes
Spectrum analysis
Voltammetry
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Summary:Recently, electro-oxidation of kraft lignin has been reported as a prominent electrochemical reaction to generate hydrogen at lower overpotential in alkaline water electrolysis. However, this reaction is highly limited by the low performance of existing electrocatalysts. Herein, we report a novel yet effective catalyst that comprises nonprecious trimetallic (Ni, Fe, and Co) nanoalloy as a core in a phosphidated nitrogen-doped carbon shell (referred to as sample P-NiFeCo/NC) for efficient electro-oxidation of kraft lignin at different temperatures in alkaline medium. The as-synthesized catalyst electro-oxidizes lignin only at 0.2 V versus Hg/HgO, which is almost three times less positive potential than in the conventional oxygen evolution reaction (0.59 V versus Hg/HgO) at 6.4 mA/cm2 in 1 M KOH. The catalyst demonstrates a turnover frequency (TOF) three to five times greater in lignin containing 1 M KOH than that of pure 1 M KOH. More importantly, the catalyst P-NiFeCo/NC shows theoretical hydrogen production of about 0.37 μmoles/min in the presence of lignin, much higher than that in pure 1 M KOH (0.0078 μ moles/min). Thus, this work verifies the benefit of the NiFeCo nanoalloy incorporated in carbon matrix, providing the way to realize a highly active catalyst for the electro-oxidation of kraft lignin.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14183781