Fig. 6From: A Highly Nanoporous Nitrogen-Doped Carbon Microfiber Derived from Bioresource as a New Kind of ORR Electrocatalysta CV and b LSV curves of Me-CFZ-700, Me-CFZ-800, Me-CFZ-900, and Me-CFZ-1000 in O2-saturated 0.1 mol l−1 KOH solution. c Disk and ring currents obtained with LSVs on RRDE for Me-CFZ-700, Me-CFZ-800, Me-CFZ-900, and Me-CFZ-1000 in O2-saturated 0.1 mol l−1 KOH solution. d The corresponding electron transfer number and H2O2 yield from cBack to article page