Anion exchange polymer electrolytes
View Patent ↗Anion exchange polymer electrolytes that include guanidinium functionalized polymers may be used as membranes and binders for electrocatalysts in preparation of anodes for electrochemical cells such as solid alkaline fuel cells.
1. A composition having the formula
wherein X is S or O;
wherein Y is
wherein Z is SO 2 or S,
wherein n is from 1 to 1000, and
wherein G comprises guanidine or guanidinium, said guanidine having the formula
said guanidinium having the formula
wherein R 1 , R 2 , R 3 , and R 4 are each independently selected from —H, —CH 3 , —NH 2 , —N(═O), —NO 2 , —CN, —(CH) m CH 3 wherein m=1-6, HC(═O)—, CH 3 C(═O)—, NH 2 C(═O)—, —(CH 2 ) m COOH where m=1-6, —(CH 2 ) m CH(NH 2 )—COOH where m=1-6, —CH—(COOH)—CH 2 —COOH, —CH 2 —CH(O—CH 2 CH 3 ) 2 , —(C═S)—NH 2 , —(C═NH)—N((CH 2 ) n1 (CH 3 )((CH 2)n2 (CH 3 )) where n 1 =0-6 and n 2 =0-6, —NH—(C═S)—SH, —CH 2 —C(═O)—O—C(CH 3 ) 3 , —O—(CH 2 ) m —CH(NH 2 )—COOH, where m=1-6, —(CH 2 ) m —CH═CH 2 wherein m=1-6, —(CH 2 ) m —CH 2 —CN where m=1-6, an aromatic group, a halide, or halide-substituted methyl group,
wherein R 5 =alkyl, and
wherein A − is a counterion.
2. The composition of claim 1 , wherein R 5 is methyl or ethyl.
3. The composition of claim 1 , wherein the counterion A- is selected from hydroxide, carbonate, bicarbonate, fluoride, chloride, bromide, iodide, IO 3 − , SO 4 −2 , HSO 3 − , H 2 PO 4 − , NO 3 − , and CH 3 OSO 3 − .
4. The composition of claim 1 ,
wherein X=O,
wherein
wherein Z=SO 2 ,
wherein
wherein R 1 =R 2 =R 3 =R 4 =—CH 3 .
5. The composition of claim 1 ,
wherein X=O,
wherein
wherein Z=SO 2 ,
wherein
wherein R 1 =R 2 =R 3 =R 4 =R 5 =—CH 3 , and
wherein A − is CH 3 OSO 3 − or OH − .
6. The composition of claim 1 , wherein n is at least 5.
7. The composition of claim 1 , wherein n is from about 10 to about 100.
8. The composition of claim 1 , wherein n is about 50.