In situ addition of graphitic carbon into a NiCo2O4/CoO composite: enhanced catalysis toward the oxygen evolution reaction
| Autor: | Craig E. Banks, Jack P. Hughes, Ashoka S, N. Srinivasa, Prashanth Shivappa Adarakatti, L. Shreenivasa, Samuel J. Rowley-Neale |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Composite number Inorganic chemistry Oxygen evolution 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Water splitting Graphite 0210 nano-technology Hydrogen production |
| Zdroj: | RSC Advances. 9:24995-25002 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c9ra05195c |
| Popis: | © The Royal Society of Chemistry 2019. We present a rapid, environmentally benign one-pot synthesis technique for the production of a NiCo2O4/CoO and graphite composite that demonstrates efficient electrocatalysis towards the Oxygen Evolution Reaction (OER), in 1.0 M KOH. The NiCo2O4/CoO/graphitic carbon composite that displayed optimal OER catalysis was synthesized by nitrate decomposition in the presence of citric acid (synthesized glycine and sucrose variants displayed inferior electro kinetics towards the OER). Screen-printed electrodes modified with ca. 530 μg cm-2 of the citric acid NiCo2O4/CoO/graphite variant displayed remarkable OER catalysis with an overpotential (η) of +323 mV (vs. RHE) (recorded at 10 mA cm-2), which is superior to that of IrO2 (340 mV) and RuO2 (350 mV). The composite also exhibited a large achievable current density of 77 mA cm-2 (at +1.5 V (vs. RHE)), a high O2 turnover frequency of 1.53 × 10-2 s-1 and good stability over the course of 500 repeat cycles. Clearly, the NiCo2O4/CoO composite has the potential to replace precious metal based catalysts as the anodic material within electrolysers, thereby providing a reduction in the associated costs of hydrogen production via water splitting. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|