Grain-Boundary-Rich Noble Metal Nanoparticle Assemblies : Synthesis, Characterization, and Reactivity

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xin Geng
  • Shuwei Li
  • Jaeyoung Heo
  • Yi Peng
  • Wenhui Hu
  • Yanchao Liu
  • Jier Huang
  • Dongsheng Li
  • Liang Zhang
  • Long Luo

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2204169
Journal / PublicationAdvanced Functional Materials
Publication statusOnline published - 15 Jun 2022

Abstract

Here, a comprehensive study on the synthesis, characterization, and reactivity of grain-boundary (GB)-rich noble metal nanoparticle (NP) assemblies is presented. A facile and scalable synthesis of Pt, Pd, Au, Ag, and Rh NP assemblies is developed, in which NPs are predominantly connected via sigma 3 (111) twin GBs, forming a network. Driven by water electrolysis, the random collisions and oriented attachment of colloidal NPs in solution lead to the formation of sigma 3 (111) twin boundaries and some highly mismatched GBs. This synthetic method also provides convenient control over the GB density without altering the crystallite size or GB type by varying the NP collision frequency. The structural characterization reveals the presence of localized tensile strain at the GB sites. The ultrahigh activity of GB-rich Pt NP assembly toward catalytic hydrogen oxidation in air is demonstrated, enabling room-temperature catalytic hydrogen sensing for the first time. Finally, density functional theory calculations reveal that the strained sigma 3(111) twin boundary facilitates oxygen dissociation, drastically enhancing the hydrogen oxidation rate via the dissociative pathway. This reported large-scale synthesis of the sigma 3 (111) twin GB-rich structures enables the development of a broad range of high-performance GB-rich catalysts.

Research Area(s)

  • catalyses, electrosyntheses, grain boundaries, hydrogen sensors, nanoparticle assemblies, noble metals, HYDROGEN SENSORS, ORIENTED ATTACHMENT, SCHERRER EQUATION, ELECTROREDUCTION, WATER

Citation Format(s)

Grain-Boundary-Rich Noble Metal Nanoparticle Assemblies : Synthesis, Characterization, and Reactivity. / Geng, Xin; Li, Shuwei; Heo, Jaeyoung; Peng, Yi; Hu, Wenhui; Liu, Yanchao; Huang, Jier; Ren, Yang; Li, Dongsheng; Zhang, Liang; Luo, Long.

In: Advanced Functional Materials, 15.06.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review