Fig. 7: 2D HSQC NMR and GPC characterization of the birch lignin before and after oxidation and electroreduction.
From: Modulating product selectivity in lignin electroreduction with a robust metallic glass catalyst
a–c Oxygenated regions and d–f aromatic regions of the 2D HSQC NMR spectra. The left column: extracted lignin, the middle column: oxidized lignin, and the right column: degraded lignin. g GPC curves for extracted, oxidized, and degraded birch lignin. Reaction conditions: H-cell, −1.00 VRHE, 12 h, a three-electrode system with a Pd30Ni50P20 MG cathode as the working electrode, a RuO2-IrO2/Ti mesh anode, and an Ag/AgCl reference electrode, with all potentials converted to the RHE scale. Catholytes: 2 g L−1 oxidized birch lignin in 14.25 mL [Emim][BF4]-MeOH-H2O (1:1:1. v/v/v), anolytes: 0.5 M Na2SO4 (pH = 7.00), with a pH error of ±0.05. The potential values are not iR-corrected. Source data for Fig. 7 g are provided as a Source Data file.
