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  In Situ Modification of a Delafossite-Type PdCoO2 Bulk Single Crystal for Reversible Hydrogen Sorption and Fast Hydrogen Evolution

Li, G., Khim, S., Chang, C. S., Fu, C., Nandi, N., Li, F., et al. (2019). In Situ Modification of a Delafossite-Type PdCoO2 Bulk Single Crystal for Reversible Hydrogen Sorption and Fast Hydrogen Evolution. ACS Energy Letters, 2185-2191. doi:10.1021/acsenergylett.9b01527.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-BDD3-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BDD9-3
Genre: Journal Article

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 Creators:
Li, Guowei1, Author              
Khim, Seunghyun2, Author              
Chang, Celesta S.3, Author
Fu, Chenguang1, Author              
Nandi, Nabhanila2, Author              
Li, Fan3, Author
Yang, Qun1, Author              
Blake, Graeme R.3, Author
Parkin, Stuart3, Author
Auffermann, Gudrun4, Author              
Sun, Yan1, Author              
Muller, David A.3, Author
Mackenzie, Andrew P.5, Author              
Felser, Claudia6, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3External Organizations, ou_persistent22              
4Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              
5Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              
6Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Chromium compounds; Copper compounds; Crystal structure; Electrocatalysts; Electron transitions; Hydrogen; Nanoclusters; Palladium; Single crystals; Surface structure, Bulk single crystals; Electrochemical activation; Electron transfer process; Heterogeneous reactions; High-speed channels; Hydrogen evolution reactions; Long term stability; Reversible hydrogen sorptions, Palladium compounds
 Abstract: The observation of extraordinarily high conductivity in delafossite-type PdCoO2 is of great current interest, and there is some evidence that electrons behave like a fluid when flowing in bulk crystals of PdCoO2. Thus, this material is an ideal platform for the study of the electron transfer processes in heterogeneous reactions. Here, we report the use of bulk single-crystal PdCoO2 as a promising electrocatalyst for hydrogen evolution reactions (HERs). An overpotential of only 31 mV results in a current density of 10 mA cm-2, accompanied by high long-term stability. We have precisely determined that the crystal surface structure is modified after electrochemical activation with the formation of strained Pd nanoclusters in the surface layer. These nanoclusters exhibit reversible hydrogen sorption and desorption, creating more active sites for hydrogen access. The bulk PdCoO2 single crystal with ultrahigh conductivity, which acts as a natural substrate for the Pd nanoclusters, provides a high-speed channel for electron transfer. © 2019 American Chemical Society.

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Language(s): eng - English
 Dates: 2019-08-152019-08-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1021/acsenergylett.9b01527
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Title: ACS Energy Letters
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 2185 - 2191 Identifier: ISSN: 2380-8195
CoNE: https://pure.mpg.de/cone/journals/resource/2380-8195