TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fuel is hydrogen or methanol. The oxidant is oxygen. WIDER DISCLOSURE - Also disclosed:    (1) ionomer comprising reaction product of (I), (II) and (III) in an azeotropic solvent mixed with an inert aprotic polar solvent;    (2) ionomer comprising (I) with an ionomer-contributing monomer;    (3) preparation of sulfonated poly(phthalazinone ether ketone) and sulfonated poly(phthalazinone ether sulfone);    (4) generating electricity; and    (5) polymer comprising the ionomer.    EXAMPLE - A commercial gas diffusion electrode containing unsupported Pt RuOx (4 mg/cm2) and 10% PTFE in catalyst layer, was applied on non-wetproof carbon paper gas diffusion medium to obtain anode. A commercial gas diffusion electrode containing Pt black (4 mg/cm2) and 20% PTFE in catalyst layer was applied onto a single sided ELAT gas diffusion medium to obtain cathode. The electrodes were die-cut. The anode was impregnated with Nafion (RTM) solution (1100 EW) (0.7 mg dry ionomer/cm2). The cathode was impregnated with Nafion(RTM) solution (1100 EW) (0.3 mg dry ionomer/cm2). 4-4-(Hydroxyphenyl)phthalazinone (20 mmol), mixture (20 mmol) of 5,5'-carbonylbis(2-fluorobenzene sulfonate) and 4,4'-difluorobenzophenone and alkali were added into a mixture of DMSO (40 ml) and toluene (45 ml). The mixture was refluxed for 3 hours at 150 degrees C and excess toluene was distilled off. The mixture was heated at 175 degrees C for 20 hours. The reaction mixture was cooled to room temperature and poured into water to precipitate the copolymer. The crude product was worked up to give sulfonated poly(phthalazinone ether ketone) (sPPEK).    The electrodes were impregnated with the sPPEK by standard hot pressing at 12 tons load, 200 degrees F for 3 minutes to obtain MEA (inventive). The electrodes were impregnated with NAFION 117 (RTM; perfluorosulfonic acid solid polymer electrolytes) by standard hot pressing at 12 tons load, 320 degrees F for 3 minutes to obtain MEA (comparative). The inventive and comparative MEAs were used to prepare inventive and comparative fuel cells, respectively. The cells were analyzed. Results of fuel utilization efficiency (%), and system efficiency (%) in saturated air at 65 degrees C and 100 ml/minute for inventive/comparative cells were 67/31 and 30/13, respectively.