Electrochemical Generation of ROS in Ionic Liquid for the Degradation of Lignin Model Compound

Wang, Lei; Liu, Shuangyan; Jiang, Haomin; Chen, Yueying; Wang, Linan; Duan, Guo‐Yi; Sun, Yanzhi; Chen, Yongmei; Wan, Pingyu

doi:10.1149/2.0801811jes

Cited by 25 publications

(16 citation statements)

References 35 publications

(33 reference statements)

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“…Volmer et al (Table , entry 7) studied the lignin ECOD with reticulated vitreous carbon foam electrodes and using two different ILs, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([emim][OTf]) and triethylammonium methanesulfonate (TMS). They demonstrated the participation of electrogenerated H 2 O 2 or hydroxyl radicals (from the oxidation of intentionally added H 2 O) as both auxiliary oxidant and radical scavenger (as also observed in other works − ), which inhibits the repolymerization of monomers under oxidative pathways. TMS and [emim][OTf] showed maximum lignin decomposition rates of 22–31 and 19–23 wt%, respectively.…”

Section: Demonstrated Electrochemical Routes For Conversion Of Interm...supporting

confidence: 70%

Electrochemical Routes for the Valorization of Biomass-Derived Feedstocks: From Chemistry to Application

et al. 2021

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The drive to reduce consumption of fossil resources, coupled with expanding capacity for renewable electricity, invites the exploration of new routes to utilize this energy for the sustainable production of fuels, chemicals, and materials. Biomass represents a possible source of platform precursors for such commodities due to its inherent ability to fix CO 2 in the form of multi-carbon organic molecules. Electrochemical methods for the valorization of biomass are thus intriguing, but there is a need to objectively evaluate this field and define the opportunity space by identifying pathways suited to electrochemistry. In this contribution we offer a comprehensive, critical review of recent advances in lowtemperature (liquid phase), electrochemical reduction and oxidation of biomass-derived intermediates (polyols, furans, carboxylic acids, amino acids, and lignin), with emphasis on identifying the state-of-the-art for each documented reaction. Progress in computational modeling is also reviewed. We further suggest a number of possible reactions that have not yet been explored but which are expected to proceed based on established routes to transform specific functional groups. We conclude with a critical discussion of technological challenges for scale-up, fundamental research needs, process intensification opportunities (e.g., by pairing compatible oxidations and reductions), and new benchmarking standards that will be necessary to accelerate progress toward application in this still-nascent field.

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Section: Demonstrated Electrochemical Routes For Conversion Of Interm...supporting

confidence: 70%

Electrochemical Routes for the Valorization of Biomass-Derived Feedstocks: From Chemistry to Application

et al. 2021

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“…In other ionic liquids, including [BMIM]BF 4 [135] and [HNEt 3 ] [HSO 4 ], [136] superoxide radical * O 2 À ) was generated from oxygen by one-electron reduction. The generated * O 2 À radical was further transformed into hydroperoxyl radical ( * OOH) with protons donated by the lignin model compound (PBP).…”

Section: Electrical-chemical Combination Reactions For Lignin Conversionmentioning

confidence: 99%

“…In other ionic liquids, including [BMIM]BF 4 and [HNEt 3 ][HSO 4 ], superoxide radical . O 2 − ) was generated from oxygen by one‐electron reduction.…”

Section: Electrooxidation Of Lignin Conversionmentioning

confidence: 99%

Electrochemical Lignin Conversion

Zhang

Sullivan

et al. 2020

ChemSusChem

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Lignin is the largest source of renewable aromatic compounds, making the recovery of aromatic compounds from this material a significant scientific goal. Recently, many studies have reported on lignin depolymerization and upgrading strategies. Electrochemical approaches are considered to be low cost, reagent free, and environmentally friendly, and can be carried out under mild reaction conditions. In this Review, different electrochemical lignin conversion strategies, including electrooxidation, electroreduction, hybrid electro‐oxidation and reduction, and combinations of electrochemical and other processes (e. g., biological, solar) for lignin depolymerization and upgrading are discussed in detail. In addition to lignin conversion, electrochemical lignin fractionation from biomass and black liquor is also briefly discussed. Finally, the outlook and challenges for electrochemical lignin conversion are presented.

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“…PBP as the lignin model compound was electrolyzed using an ORR cathode in [BMIM]BF 4 (an aprotic IL), and the highest conversion rate of 83.6% for 4 h at a current density of 0.4 mA/cm 2 was observed (as shown in Figure 5A) [72]. The ORR process in [BMIM]BF 4 was studied and the number of the transferring electrons was estimated to be 1.…”

Section: Degradation Of Lignin and Lignin Model Compounds By Ros Genementioning

confidence: 99%

Electrochemical Degradation of Lignin by ROS

Jiang

Xue

Wang

et al. 2020

Sustainable Chemistry

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Lignin is a unique renewable aromatic resource in nature. In the past decades, researchers have attempted to breakdown the linkage bonds in lignin to provide aromatic platform chemicals that used to come from the petrochemical industry. In recent years, electrochemical lignin degradation under mild conditions has drawn much attention from the scientific community owing to its potential to scale up and its environmental friendliness. Sustainable electrochemical degradation of lignin consumes less energy and usually requires mild conditions, but low degradation efficiency and insufficient product selectivity are still significant challenges. The method for lignin degradation by reactive oxygen species (ROS) generated through the water oxidation reaction (WOR) at the anode and oxygen reduction reaction (ORR) at the cathode are more attractive for sustainable electrochemical degradation. The present contribution aims to review advancements in electrochemical degradation of lignin in aqueous or non-aqueous supporting electrolytes, focusing on the regulation of ROS in situ generated on the electrode.

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Electrochemical Generation of ROS in Ionic Liquid for the Degradation of Lignin Model Compound

Cited by 25 publications

References 35 publications

Electrochemical Routes for the Valorization of Biomass-Derived Feedstocks: From Chemistry to Application

Electrochemical Routes for the Valorization of Biomass-Derived Feedstocks: From Chemistry to Application

Electrochemical Lignin Conversion

Electrochemical Degradation of Lignin by ROS

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