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SEM images of three typical composite electrodes. (a) Carbon electrode coated with PVA/SSA polymer solution, copyright Elsvier, 2010; (b) composite carbon electrode coated with resin powder, copyright Elsvier, 2012; (c) Sulfonated graphite (SG) carbon nanofibre composite. Reproduced with permission from [27,28,35], copyright John Wiley and Sons, 2015.
