Water Oxidation Electrocatalysis with a Cobalt-Borate-Based Hybrid System under Neutral Conditions
| Autor: | Ufuk Şahin, Emine Ülker, Yavuz Dede, Emine A. Turhan, Ferdi Karadas, Satya Vijaya Kumar Nune |
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| Přispěvatelé: | Turhan, Emine A., Nune, Satya Vijaya Kumar, Karadaş, Ferdi |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Water oxidation
Chemistry Organic Chemistry chemistry.chemical_element Cobalt 02 engineering and technology General Chemistry Crystal structure Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Electrochemistry 01 natural sciences Catalysis 0104 chemical sciences Density functional calculations Chemical engineering Water splitting Electrocatalysis 0210 nano-technology Boron Borate |
| Zdroj: | Chemistry: A European Journal |
| Popis: | The development of new water oxidation electrocatalysts that are both stable and efficient, particularly in neutral conditions, holds great promise for overall water splitting. In this study, the electrocatalytic water oxidation performance of a new cobalt-based catalyst, Co3(BO3)2, with a Kotoite-type crystal structure is investigated under neutral conditions. The catalyst is also hybridized with CNTs to enhance its electrocatalytic properties. A remarkable increase in catalytic current along with a significant shift in the onset overpotential is observed in Co3(BO3)2@CNT. Additionally, CNT addition also greatly influences the surface concentration of the catalyst: 12.7 nmol cm−2 for Co3(BO3)2@CNT compared with 3.9 nmol cm−2 for Co3(BO3)2. Co3(BO3)2@CNT demands overpotentials of 303 and 487 mV to attain current densities of 1 and 10 mA cm−2, respectively, at pH 7. Electrochemical and characterization studies performed over varying pH conditions reveal that the catalyst retains its stability over a pH range of 3-14. Multi-reference quantum chemical calculations are performed to study the nature of the active cobalt sites and the effect of boron atoms on the activity of the cobalt ions. The authors thank the Science and Technology Council of Turkey, TUBITAK (Project No: 214Z095) for financial support. E.U. thanks TUBITAK for support (Project No: 1929B011500059). Y.D. thanks BAGEP and TÜBA-GEBİP for young investigator awards and ECOSTBio (CM 1305) for support. TUBITAK TRGRID infrastructure is gratefully acknowledged for HPC resources. |
| Databáze: | OpenAIRE |
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