title: Pd Nanoparticles and MOFs Synergistically Hybridized Halloysite Nanotubes for Hydrogen Storage.
abstract: Natural halloysite nanotubes (HNTs) were hybridized with metal-organic frameworks (MOFs) to prepare novel composites. MOFs were transformed into carbon by carbonization calcination, and palladium (Pd) nanoparticles were introduced to build an emerging ternary compound system for hydrogen adsorption. The hydrogen adsorption capacities of HNT-MOF composites were 0.23 and 0.24 wt%, while those of carbonized products were 0.24 and 0.27 wt% at 25 °C and 2.65 MPa, respectively. Al-based samples showed higher hydrogen adsorption capacities than Zn-based samples on account of different selectivity between metal and hydrogen and approximate porous characteristics. More pore structures are generated by the carbonization reaction from metal-organic frameworks into carbon; high specific surface area, uniform pore size, and large pore volume benefited the hydrogen adsorption ability of composites. Moreover, it was also possible to promote hydrogen adsorption capacity by incorporating Pd. The hydrogen adsorption capacity of ternary compound, Pd-C-H3-MOFs(Al), reached 0.32 wt% at 25 °C and 2.65 MPa. Dissociation was assumed to take place on the Pd particles, then atomic and molecule hydrogen spilled over to the structure of carboxylated HNTs, MOFs, and the carbon products for enhancing the hydrogen adsorption capacity.
authors.affiliation: Centre for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.|Hunan Key Lab of Mineral Materials and Application, Central South University, Changsha, 410083, China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Jin
authors.affiliation: Centre for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.|Hunan Key Lab of Mineral Materials and Application, Central South University, Changsha, 410083, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Ouyang
authors.affiliation: Centre for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China. hmyang@csu.edu.cn.|Hunan Key Lab of Mineral Materials and Application, Central South University, Changsha, 410083, China. hmyang@csu.edu.cn.|State Key Lab of Powder Metallurgy, Central South University, Changsha, 410083, China. hmyang@csu.edu.cn.
authors.forename: Huaming
authors.initials: H
authors.lastname: Yang
keywords: Halloysite nanotubes; Hybrid; Hydrogen storage; Metal–organic frameworks (MOFs); Pd nanoparticles