Biocoal: A renewable and massively producible fuel from ...
the oxygencontaining groups were taken off. The asprepared biocoal was a blocky solid with glossy black surface, which is similar to commercialized coal in color. The scanning electron microscopy (SEM) images show that biocoal was an amorphous and imporous bulk (Fig. 1, B and C). More images of the biocoal are provided in fig. S1.