Functionalizing Lignin-Based Nanofiber Electrodes with Gold Using Electrochemically Assisted Aqueous Reduction

Reima Herrala; Linfan Cui; Bianca Ligt; Bruno Dufau Mattos; Kirsi Yliniemi; Marta Costa Figueiredo; Mari Lundström; Jaana Vapaavuori

doi:10.1002/admi.202400748

Functionalizing Lignin-Based Nanofiber Electrodes with Gold Using Electrochemically Assisted Aqueous Reduction

Reima Herrala, Linfan Cui, Bianca Ligt, Bruno Dufau Mattos, Kirsi Yliniemi, Marta Costa Figueiredo, Mari Lundström, Jaana Vapaavuori (Corresponding author)

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Abstract

This work demonstrates how the electrochemically assisted aqueous reduction (EAR) method can be employed with lignin to prepare functional surfaces from underutilized resources. First, electrospun lignin nanofiber mats are carbonized at 700, 900, and 1100 °C to prepare electrodes with conductivities between 1.1 and 12 S cm⁻¹. The films are then functionalized with EAR, which allows for gold (5 mg L⁻¹) to be selectively deposited as nanoparticles from acidic chloride solutions containing much larger concentrations of copper (20 g L⁻¹), mimicking hydrometallurgical process conditions. The successful functionalization by gold nanoparticles is confirmed by the electrochemical oxidation of ethanol and reduction of carbon dioxide, thus highlighting the use of secondary raw materials in a high added-value application.

Original language	English
Article number	2400748
Number of pages	9
Journal	Advanced Materials Interfaces
Volume	12
Issue number	10
Early online date	29 Apr 2025
DOIs	https://doi.org/10.1002/admi.202400748
Publication status	Published - 19 May 2025

Funding

This work was supported by the Research Council of Finland project EARMetal (project numbers R.H., L.C., K.Y., M.L.: 339979 and R.H., L.C., K.Y., J.V.: 342080) and RawMatTERS Finland Infrastructure and Bioeconomy at Aalto University funded by the Research Council of Finland. The authors acknowledge the funding provided by the Dutch Research Council (NWO) as part of the Reversible Large-scale Energy Storage (RELEASE) consortium (project number 17621). They are grateful to Jani Sainio for the XPS measurements. This work was supported by the Research Council of Finland project EARMetal (project numbers R.H., L.C., K.Y., M.L.: 339979 and R.H., L.C., K.Y., J.V.: 342080) and RawMatTERS Finland Infrastructure and Bioeconomy at Aalto University funded by the Research Council of Finland. The authors acknowledge the funding provided by the Dutch Research Council (NWO) as part of the Reversible Large\u2010scale Energy Storage (RELEASE) consortium (project number 17621). They are grateful to Jani Sainio for the XPS measurements.

Keywords

electrodeposition
gold nanoparticles
lignin
nanofibers
selective recovery

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abstract = "This work demonstrates how the electrochemically assisted aqueous reduction (EAR) method can be employed with lignin to prepare functional surfaces from underutilized resources. First, electrospun lignin nanofiber mats are carbonized at 700, 900, and 1100 °C to prepare electrodes with conductivities between 1.1 and 12 S cm−1. The films are then functionalized with EAR, which allows for gold (5 mg L−1) to be selectively deposited as nanoparticles from acidic chloride solutions containing much larger concentrations of copper (20 g L−1), mimicking hydrometallurgical process conditions. The successful functionalization by gold nanoparticles is confirmed by the electrochemical oxidation of ethanol and reduction of carbon dioxide, thus highlighting the use of secondary raw materials in a high added-value application.",

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AU - Herrala, Reima

AU - Cui, Linfan

AU - Ligt, Bianca

AU - Mattos, Bruno Dufau

AU - Yliniemi, Kirsi

AU - Costa Figueiredo, Marta

AU - Lundström, Mari

AU - Vapaavuori, Jaana

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AB - This work demonstrates how the electrochemically assisted aqueous reduction (EAR) method can be employed with lignin to prepare functional surfaces from underutilized resources. First, electrospun lignin nanofiber mats are carbonized at 700, 900, and 1100 °C to prepare electrodes with conductivities between 1.1 and 12 S cm−1. The films are then functionalized with EAR, which allows for gold (5 mg L−1) to be selectively deposited as nanoparticles from acidic chloride solutions containing much larger concentrations of copper (20 g L−1), mimicking hydrometallurgical process conditions. The successful functionalization by gold nanoparticles is confirmed by the electrochemical oxidation of ethanol and reduction of carbon dioxide, thus highlighting the use of secondary raw materials in a high added-value application.

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Functionalizing Lignin-Based Nanofiber Electrodes with Gold Using Electrochemically Assisted Aqueous Reduction

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