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Electrochemical biomass upgrading: degradation of glucose to lactic acid on a copper(II) electrode
RSC Advances ( IF 3.9 ) Pub Date : 2021-09-22 , DOI: 10.1039/d1ra06737k
Lars Ostervold 1, 2 , Sergio I Perez Bakovic 2 , Jamie Hestekin 2 , Lauren F Greenlee 1, 2
Affiliation  

Biomass upgrading – the conversion of biomass waste into value-added products – provides a possible solution to reduce global dependency on nonrenewable resources. This study investigates the possibility of green biomass upgrading for lactic acid production by electrochemically-driven degradation of glucose. Herein we report an electrooxidized copper(II) electrode which exhibits a turnover frequency of 5.04 s−1 for glucose conversion. Chronoamperometry experiments under varied potentials, alkalinity, and electrode preparation achieved a maximum lactic acid yield of 23.3 ± 1.2% and selectivity of 31.1 ± 1.9% (1.46 V vs. RHE, 1.0 M NaOH) for a room temperature and open-to-atmosphere reaction. Comparison between reaction conditions revealed lactic acid yield depends on alkalinity and applied potential, while pre-oxidation of the copper had a negligible effect on yield. Post-reaction cyclic voltammetry studies indicated no loss in reactivity for copper(II) electrodes after a 30 hour reaction. Finally, a mechanism dependent on solvated Cu2+ species is proposed as evidenced by similar product distributions in electrocatalytic and thermocatalytic systems.

中文翻译:

电化学生物质升级:在铜 (II) 电极上将葡萄糖降解为乳酸

生物质升级——将生物质废物转化为增值产品——为减少全球对不可再生资源的依赖提供了可能的解决方案。本研究探讨了通过电化学驱动的葡萄糖降解对乳酸生产进行绿色生物质升级的可能性。在此,我们报告了一种电氧化铜( II ) 电极,其葡萄糖转化的周转频率为5.04 s -1。在不同电位、碱度和电极制备下的计时电流法实验实现了 23.3 ± 1.2% 的最大乳酸产率和 31.1 ± 1.9% 的选择性(1.46 V vs.RHE, 1.0 M NaOH) 用于室温和大气开放反应。反应条件之间的比较表明乳酸产率取决于碱度和施加的电位,而铜的预氧化对产率的影响可以忽略不计。反应后循环伏安法研究表明,铜 ( II ) 电极在反应 30 小时后没有反应性损失。最后,提出了一种依赖于溶剂化Cu 2+物质的机制,这一点由电催化和热催化系统中类似的产物分布证明。
更新日期:2021-09-22
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