title: Surface modification of hydroxyapatite for hydrogen generation.
abstract: Hydrogen provides a safe and clean alternative to carbon-based fuels. Having the proper catalytic support for production of hydrogen is a valuable technology. We report on the surface modification of hydroxyapatite as a novel catalytic support material for hydrogen generation. Aside from being inexpensive and durable, we reveal that Ru ion exchange on the HAP surface provides a highly active support for sodium borohydride hydrolysis, exemplifying a high total turnover number on the order of 24,000 mol H(2)/mol Ru. Moreover, we observe that the RuHAP support exhibits a long catalytic lifetime of approximately 1month upon repeated exposure to NaBH(4) solutions. We identified the ability of complex surface morphology to enhance hydrolysis by the catalytic transition metal covered surface. Particularly, we found that the complex morphology of polycrystalline RuHAP catalytic supports exhibits shorter induction times for hydrogen generation as well as improved reaction rates as compared with single crystal supports possessing the same Ru content. By decreasing induction time and enhancing catalytic activity, we find it feasible to further explore this catalyst support in the construction of a practical hydrogen generation system.
authors.affiliation: Department of Chemistry and RINS, Gyeongsang National University, Jinju, 660-701, South Korea.
authors.forename: Justyn Wayne
authors.initials: JW
authors.lastname: Jaworski
authors.forename: Daehyun
authors.initials: D
authors.lastname: Kim
authors.forename: Kyeongmun
authors.initials: K
authors.lastname: Jung
authors.forename: Sohue
authors.initials: S
authors.lastname: Kim
authors.forename: Jong Hwa
authors.initials: JH
authors.lastname: Jung
authors.forename: Jong Ok
authors.initials: JO
authors.lastname: Jeong
authors.forename: Hyo Sang
authors.initials: HS
authors.lastname: Jeon
authors.forename: Byoung Koun
authors.initials: BK
authors.lastname: Min
authors.forename: Ki-Young
authors.initials: KY
authors.lastname: Kwon