A new preparation of a bifunctional crystalline heterogeneous copper electrocatalyst by electrodeposition using a Robson-type macrocyclic dinuclear copper complex for efficient hydrogen and oxygen evolution from water
| Autor: | A.M. Abdel Haleem, Samit Majumder, Perumandla Nagaraju, Yoshinori Naruta |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Inorganic chemistry Oxygen evolution 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Heterogeneous catalysis 01 natural sciences 0104 chemical sciences Catalysis Inorganic Chemistry chemistry.chemical_compound Water splitting 0210 nano-technology Bifunctional Hydrogen production |
| Zdroj: | Dalton transactions (Cambridge, England : 2003). 46(28) |
| ISSN: | 1477-9234 |
| Popis: | The development of low-cost, stable bifunctional electrocatalysts, which operate in the same electrolyte with a low overpotential for water splitting, including the oxygen evolution reaction and the hydrogen evolution reaction, remains an attractive prospect and a great challenge. In this study, a water soluble Robson-type macrocyclic dicopper(II) complex has been used for the first time as a catalyst precursor for the generation of a copper-based bifunctional heterogeneous catalyst film, which can be used for both HER and OER at a near neutral pH. In sodium borate buffer at pH 9.20, this complex decomposed to give a Cu(OH)2/Cu2O-based thin film on FTO that catalyzes both hydrogen production and water oxidation. The morphology, nature and composition of the thin film were fully characterized by scanning electron microscopy, powder X-ray diffraction, X-ray photoelectron, and energy dispersive X-ray spectroscopies. The catalyst film showed high stability during the course of electrolysis in either the cathodic or the anodic direction for more than 4 h. Faradaic efficiencies of ∼92% for HER and ∼96% for OER were achieved. The switch between the two half-reactions of catalytic water splitting was fully reversible in nature. |
| Databáze: | OpenAIRE |
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