Patent ID: 7842199

Claim:
A proton conducting titanate comprising: titanate of the formula H 2 Ti 3 O 7 ; and a sulfonic acid group-containing moiety having proton conductivity introduced into the surface of the titanate, wherein the sulfonic acid group-containing moiety is directly bound to the titanate via an ether bond (—O—) and wherein the sulfonic acid group-containing moiety is —O—AR 1 SO 3 H wherein R 1 is a substituted or unsubstituted C1-C12 alkylene group or a substituted or unsubstituted C1-C12 alkenylene group, A is —C(R′)(R″)— or —C═O—, and R′ and R″ are each independently hydrogen or a C1-C10 alkyl group, or R′ and R″ together form a ring represented by the following formula: wherein * represents the position where R′ and R″ are attached to carbon; or —O—C(R 2 )(X)C(Y 1 )(Y 2 )SO 3 H wherein R 2 is —F, —Cl, —SF 5 , ═SF 4 , —SF 4 Cl, —CF 3 , —CF 2 CF 3 , —H(CF 2 ) 4 , a C1-C12 alkyl group, a C1-C12 halogenated alkyl group, a C1-C12 alkenyl group, a C1-C12 halogenated alkenyl group, —CF 2 OSO 2 F, —(CF 2 ) 4 CHFSO 2 F, —CF 2 CF 2 CHFSO 2 F, —CF 2 CHFSO 2 F, —CF 2 OCF(CF 3 )CF 3 , —CF 2 C(═CF 2 )F, —CF 2 OCF 3 , —CF 2 C(F)(Cl)CF 2 CCl 2 F, —CH 2 CH(Cl)CH 2 Cl, or a group represented by the following formula: wherein X is —F, —H, —Cl or —CF 3 , and Y 1 and Y 2 are each independently F or Cl.