fig6
Figure 6. Conversion of HMF and yield of products over (A) Co SAs/NPs@N-CNTs, (B) Co SAs@N-CNTs, (C) Co NPs@N-CNTs and (D) N-CNTs in different reaction times. HMF: 5-hydroxymethylfurfural; SAs: single atoms; NPs: nanoparticles; CNTs: carbon nanotubes.