“…One can see that heterogeneous electrocatalysis can be divided into three mutually linked up groups as electricity generation (fuel cells), research and chemicals. As it is seen, to the first mentioned group belong technologies being already in use or in advanced preliminary phase of application as: (i) polymer electrolyte membrane fuel cells (PEMFCs) which find applications mainly in a sector of road transportation [11], stationary power generation [12], and other energy sectors [13][14][15], (ii) solid oxide fuel cells (SOFCs) [16], (iii) molten carbonate fuel cells (MCFCs) [17], (iv) phosphoric acid fuel cells (PAFCs) which are commercially available [18], and (v) alkaline fuel cells (AFCs) [19]. The catalyst required for the electrodes in AFCs can be any of a number of different chemicals that are much more cheaper in comparison with those required for other types of fuel cells.…”