Ostervold Lars, Perez Bakovic Sergio I, Hestekin Jamie, Greenlee Lauren F
Department of Chemical Engineering, Pennsylvania State University University Park PA USA
Ralph E. Martin Department of Chemical Engineering Fayetteville AR USA
RSC Adv. 2021 Sep 22;11(50):31208-31218. doi: 10.1039/d1ra06737k. eCollection 2021 Sep 21.
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 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 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 Cu species is proposed as evidenced by similar product distributions in electrocatalytic and thermocatalytic systems.
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一种可能的解决方案。本研究通过电化学驱动的葡萄糖降解来探究绿色生物质升级生产乳酸的可能性。在此，我们报道了一种电氧化铜（II）电极，其葡萄糖转化的周转频率为5.04 s⁻¹。在不同电位、碱度和电极制备条件下进行的计时电流法实验，在室温及大气开放条件下反应时，乳酸的最大产率为23.3±1.2%，选择性为31.1±1.9%（相对于可逆氢电极1.46 V，1.0 M NaOH）。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忽略不计。反应后的循环伏安法研究表明，铜（II）电极在30小时反应后反应活性没有损失。最后，提出了一种依赖于溶剂化铜物种的机理，这在电催化和热催化系统中相似的产物分布中得到了证明。
