Oxidative depolymerisation of kraft lignin

  • The production of green hydrogen may be greatly aided by the use of an alternative anode reaction replacing oxygen evolution to increase energy efficiency and concomitantly generate value-added products. Lignin, a major component of plant matter, is accumulated in large amounts in the pulp and paper industry as waste. It has excellent potential as a source of aromatic compounds and can be transformed into the much more valuable aroma chemical vanillin by electrochemical depolymerisation. We used a flow-through model electrolyser to evaluate electrocatalyst-modified Ni foam electrodes prepared by a scalable spray-polymer preparation method for oxidative lignin depolymerisation. We demonstrate how pulsing, i. e. continuously cycling between a lower and a higher applied current, increases the amount of formed vanillin while improving the energy efficiency. Further, we present a scanning droplet cell-assisted high-throughput screening approach to discover suitable catalyst materials for lignin electrooxidation considering that a suitable electrocatalyst should exhibit high activity for lignin depolymerization and simultaneously a low activity for vanillin oxidation and oxygen evolution. Combining electrosynthesis and electrocatalysis can aid in developing new customised materials for electrochemical processes of potential industrial interest.

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Author:Ann Cathrin BrixORCiDGND, Olga A. KrysiakORCiDGND, Ieva A. CechanaviciutèGND, Gal BjelovučićGND, Lars BankoORCiDGND, Alfred LudwigORCiDGND, Wolfgang SchuhmannORCiDGND
Parent Title (English):ChemElectroChem
Subtitle (English):From fabrication of multi-metal-modified electrodes for vanillin electrogeneration via pulse electrolysis to high-throughput screening of multi-metal composites
Place of publication:Hoboken, New Jersey
Document Type:Article
Date of Publication (online):2024/04/12
Date of first Publication:2023/12/19
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:Open Access Fonds
electrocatalytic lignin oxidation; flow-through cell; non-noble active anodes; performance screening; pulse electrolysis
Issue:3, Artikel e202300483
First Page:e202300483-1
Last Page:e202300483-9
Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum.
Institutes/Facilities:Lehrstuhl für Analytische Chemie und Zentrum für Elektrochemie
Dewey Decimal Classification:Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie
open_access (DINI-Set):open_access
faculties:Fakultät für Chemie und Biochemie
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International