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Davi M, Mann M, Ma Z, Schrader F, Drichel A, Budnyk S, Rokicinska A, Kustrowski P, Dronskowski R, Slabon A. An MnNCN-Derived Electrocatalyst for CuWO 4 Photoanodes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3845-3852. [PMID: 29554428 DOI: 10.1021/acs.langmuir.8b00149] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
CuWO4 is a photoanode candidate in neutral pH, and manganese-based oxygen evolution reaction electrocatalysts are of high interest due to their low price and low toxicity. Considering the unexplored chemistry of transition-metal carbodiimides/cyanamides for the PEC water oxidation, we investigated MnNCN as an electrocatalyst for CuWO4 under AM 1.5G illumination in potassium phosphate electrolyte (pH 7). Surface functionalization of CuWO4 photoanodes with MnNCN increased the photocurrent from 22 to 30 μA cm-2 at 1.23 V vs RHE. Complementary structural analysis by means of XRD and XPS revealed that MnNCN forms a core-shell structure MnNCN@MnPO x in phosphate electrolyte and mimics a manganese phosphate electrocatalyst. As such, the surface chemistry of MnNCN significantly differs from previous studies on the cobalt analogue (CoNCN). A separately prepared MnNCN electrode developed a small but detectable photocurrent due to photogenerated holes inside the semiconducting carbodiimide core of the MnNCN@MnPO x structure.
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Affiliation(s)
- Martin Davi
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
| | - Markus Mann
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
| | - Zili Ma
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
| | - Felix Schrader
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
| | - Andreas Drichel
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
| | - Serhiy Budnyk
- AC2T Research GmbH, Viktor-Kaplan-Straße 2 C , AT-2700 Wiener Neustadt , Austria
| | - Anna Rokicinska
- Faculty of Chemistry , Jagiellonian University , Gronostajowa 2 , 30-387 Krakow , Poland
| | - Piotr Kustrowski
- Faculty of Chemistry , Jagiellonian University , Gronostajowa 2 , 30-387 Krakow , Poland
| | - Richard Dronskowski
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
| | - Adam Slabon
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 , D-52056 Aachen , Germany
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Davi M, Ogutu G, Schrader F, Rokicinska A, Kustrowski P, Slabon A. Enhancing Photoelectrochemical Water Oxidation Efficiency of WO3
/α-Fe2
O3
Heterojunction Photoanodes by Surface Functionalization with CoPd Nanocrystals. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700952] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Martin Davi
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - George Ogutu
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Felix Schrader
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Anna Rokicinska
- Faculty of Chemistry; Jagiellonian University; Gronostajowa 2 30-387 Krakow Poland
| | - Piotr Kustrowski
- Faculty of Chemistry; Jagiellonian University; Gronostajowa 2 30-387 Krakow Poland
| | - Adam Slabon
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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Gold nanocrystal arrays as electrocatalysts for the oxidation of methanol and ethanol. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/znb-2016-0032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Abstract
A general difficulty in the comparison of catalysts regarding their electrochemical activities is the significant dependency on the electrode preparation method. In addition to single-crystal, thin-film, and polycrystalline electrodes, most electrocatalysts contain a physical mixture of catalytically active nanocrystals (NCs), conductive carbon support, and binding agent. This type of preparation makes the agglomeration of NCs to larger entities inevitable and simultaneously decreases the catalytically active surface area. In this work, electocatalysts based on two-dimensional arrays of self-assembled monodisperse Au NCs with a particle size of 8 nm have been fabricated. Their electrocatalytic performance in the electrochemical oxidation reaction of methanol and ethanol was investigated for different pH values. The self-assembly of Au NCs into two-dimensional arrays enables to fabricate electrocatalysts with a high mass activity in alkaline electrolytes for alcohol oxidation reactions.
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