Table 2.

The significant properties of Gr-based materials for fuel cell applications.

Gr	GO	Heteroatom Doped Gr	3D Gr
large surface area	strong hydrophilicity	tunable charge and spin density distribution	large surface area
high charge mobility	high proton conductivity	abundant active sites	high intrinsic electrical conductivity
high chemical stability	moderated electrical conductivity	high electrocatalytic activity	well-organized pore structure
strong mechanical strength	tunable electrochemical behavior	fast heterogeneous electron transfer rate	mechanical flexibility