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Main Title: Amorphous outperforms crystalline nanomaterials: surface modifications of molecularly derived CoP electro(pre)catalysts for efficient water-splitting
Author(s): Beltrán-Suito, Rodrigo
Menezes, Prashanth W.
Drieß, Matthias
Type: Article
Language Code: en
Abstract: The single source precursor (SSP) approach was used to prepare highly active CoP bifunctional electro(pre)catalysts for the oxygen evolution reaction (OER), hydrogen evolution reaction (HER) and overall water splitting (OWS) reaction starting from a molecular β-diketiminato Co(I) cyclo-P4 complex. Crystalline or amorphous CoP particles were attained depending on the preparation route. Notably, the amorphous CoP displayed higher activity compared to the crystalline CoP on nickel foam (NF) and fluorinated tin oxide (FTO) substrates due to its unique electronic properties and surface characteristics. During the OER, severe oxidation to Co-oxy(hydroxides)/oxides by the loss of P was found to be crucial to increase the concentration of CoOx active sites. Interestingly, complete leaching of surface P from CoP and surface Co enrichment occurred during the HER. Finally, an OWS device was fabricated where the amorphous CoP outperformed the crystalline CoP with respect to low OWS cell voltage (with a difference of 130 mV) and enhanced stability for 5 days.
Issue Date: 4-Jun-2019
Date Available: 9-Jul-2019
DDC Class: 540 Chemie und zugeordnete Wissenschaften
530 Physik
Subject(s): CoP
oxygen evolution reaction
single source precursor
hydrogen evolution reaction
overall water splitting
Sponsor/Funder: DFG, 390540038, EXC 2008: UniSysCat
Journal Title: Journal of Materials Chemistry A
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 7
Publisher DOI: 10.1039/C9TA04583J
Page Start: 15749
Page End: 15756
EISSN: 2050-7496
ISSN: 2050-7488
Appears in Collections:FG Metallorganische Chemie und Anorganische Materialien » Publications

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