title: Structural Evolution of Co-Based Metal Organic Frameworks in Pyrolysis for Synthesis of Core-Shells on Nanosheets: Co@CoOx@Carbon-rGO Composites for Enhanced Hydrogen Generation Activity.
abstract: In this article, Co-based metal organic frameworks (MOFs) with two shapes were used as pyrolysis precursor to synthesize multilayer core-shells composites loaded on reduced graphene oxide (rGO) sheets. The core-shell structures were obtained by the formation of cores from metal ions and carbon shells from carbonization of ligands. Controllable oxidation of Co cores to CoOx shells generated multilayer core-shell structures anchored onto the surface of rGO sheets. The N-doped composites were obtained by adding poly vinylpyrrolidone. The multilayer core-shells composites exhibited superior catalytic activity toward hydrogen generation compared to their single layer counterparts. By using the N-doped multilayer composites, high hydrogen generation specific rate of 5560 mL min(-1) gCo(-1) was achieved at room temperature. The rGO sheets in composites improved their structure stability. These catalysts exhibited high stability after used five cycling. This synergistic strategy proposes simple, efficient, and versatile blue-prints for the fabrication of rGO composites from MOFs-based precursors.
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.
authors.forename: Congcong
authors.initials: C
authors.lastname: Xing
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Henan Center for Disease Control and Prevention, 105 Nongyenan Road, Zhengzhou 450016, P. R. China.
authors.forename: Yongheng
authors.initials: Y
authors.lastname: Su
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.
authors.forename: Yinghao
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.
authors.forename: Shuo
authors.initials: S
authors.lastname: Hao
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.
authors.forename: Xianli
authors.initials: X
authors.lastname: Wu
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Tsinghua University , 1 Tsinghua Park, Beijing 100084, P. R. China.
authors.forename: Huaqiang
authors.initials: H
authors.lastname: Cao
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Science Road, Zhengzhou 450001, P. R. China.|Department of Chemistry, Tsinghua University , 1 Tsinghua Park, Beijing 100084, P. R. China.
authors.forename: Baojun
authors.initials: B
authors.lastname: Li
keywords: hydrogen generation; metal organic frameworks (MOFs); multilayer core−shells; pyrolysis; reduced graphene oxide (rGO)