title: Highly Active Carbon Supported Pd-Ag Nanofacets Catalysts for Hydrogen Production from HCOOH.
abstract: Hydrogen is regarded as a future sustainable and clean energy carrier. Formic acid is a safe and sustainable hydrogen storage medium with many advantages, including high hydrogen content, nontoxicity, and low cost. In this work, a series of highly active catalysts for hydrogen production from formic acid are successfully synthesized by controllably depositing Pd onto Ag nanoplates with different Ag nanofacets, such as Ag{111}, Ag{100}, and the nanofacet on hexagonal close packing Ag crystal (Ag{hcp}). Then, the Pd-Ag nanoplate catalysts are supported on Vulcan XC-72 carbon black to prevent the aggregation of the catalysts. The research reveals that the high activity is attributed to the formation of Pd-Ag alloy nanofacets, such as Pd-Ag{111}, Pd-Ag{100}, and Pd-Ag{hcp}. The activity order of these Pd-decorated Ag nanofacets is Pd-Ag{hcp} > Pd-Ag{111} > Pd-Ag{100}. Particularly, the activity of Pd-Ag{hcp} is up to an extremely high value, i.e., TOF{hcp} = 19 000 ± 1630 h(-1) at 90 °C (lower limit value), which is more than 800 times higher than our previous quasi-spherical Pd-Ag alloy nanocatalyst. The initial activity of Pd-Ag{hcp} even reaches (3.13 ± 0.19) × 10(6) h(-1) at 90 °C. This research not only presents highly active catalysts for hydrogen generation but also shows that the facet on the hcp Ag crystal can act as a potentially highly active catalyst.
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.|Department of Chemistry, College of Sciences, Shanghai University , 99 Shangda Road, Shanghai 200444, China.
authors.forename: Wenhui
authors.initials: W
authors.lastname: Wang
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.|Department of Chemistry, College of Sciences, Shanghai University , 99 Shangda Road, Shanghai 200444, China.
authors.forename: Ting
authors.initials: T
authors.lastname: He
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.
authors.forename: Xuehua
authors.initials: X
authors.lastname: Liu
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.
authors.forename: Weina
authors.initials: W
authors.lastname: He
authors.affiliation: College of Chemistry and Molecular Science, Wuhan University , Wuhan 430072, China.
authors.forename: Hengjiang
authors.initials: H
authors.lastname: Cong
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.
authors.forename: Yangbin
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Department of Chemistry, College of Sciences, Shanghai University , 99 Shangda Road, Shanghai 200444, China.
authors.forename: Liuming
authors.initials: L
authors.lastname: Yan
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.
authors.forename: Xuetong
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.
authors.forename: Jinping
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.|Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences , Suzhou 215125, China.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Zhou
keywords: Pd; formic acid; hexagonal close packing; hydrogen production; nanofacet