Electrosynthesis of palladium nanocatalysts using single droplet reactors and catalytic activity for formic acid oxidation

Thu Ha T. Nguyen, Myoung Won Lee, Seungwoo Hong, Hyun S. Ahn, Byung Kwon Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The synthesis of nanosized palladium (Pd) catalyst from a Pd2+ emulsion is performed using the emulsion nanodroplet-mediated electrodeposition method. In this method, aqueous emulsion droplets act as tiny reactors for the inner precursor (e.g., Pd2+) to reduce and generate the corresponding metal products while they are discretely colliding on the working ultramicroelectrode surface, which is biased at a suitable constant potential. The utilized volume of each reactor (with a given concentration of the Pd2+ precursor) and the monitored total number of deposition (i.e., droplet collision) events, being the critical factors, can facilitate the controllable (or quantifiable) synthesis of Pd nanocatalysts where the amount of Pd per deposition event and the generated product amount are determinable. In this research, individual Pd nanocatalysts nucleate from droplet collisions and become uniformly distributed on the substrate surface. The electrocatalytic activities of the synthesized Pd nanocatalysts for formic acid electrooxidation are higher than ca. 10 A mg(Pd)−1.

Original languageEnglish
Article number139446
JournalElectrochimica Acta
Volume401
DOIs
StatePublished - 1 Jan 2022

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea , which is funded by the Ministry of Science and ICT ( NRF-2021R1A2C4002069 , NRF-2020R1C1C1007409 , NRF-2020R1A4A1017737 , NRF-2020R1C1C1008886 , and NRF2019M3E6A1064707 ). This work was supported by Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education ( 2020R1A6C101B194 ). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2021R1A6A1A10039823 ).

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Emulsion droplet stochastic collision
  • Emulsion nanodroplet-mediated electrodeposition
  • Formic acid oxidation
  • Palladium nanocatalyst
  • Single entity electrochemistry

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