Electrodepositing Ru on carbon cloth supported Co(OH)2 nanosheet array for active overall water electrolysis
| Autor: | Xiaoming Fan, Jinxue Guo, Yanfang Sun, Linzheng Ma, Xiao Zhang, Qingyun Liu, Jikang Sun, Lin Tang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Electrolysis of water General Chemical Engineering Inorganic chemistry Oxygen evolution Exchange current density 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Water splitting 0210 nano-technology Bifunctional Nanosheet |
| Zdroj: | Journal of the Taiwan Institute of Chemical Engineers. 109:71-78 |
| ISSN: | 1876-1070 |
| DOI: | 10.1016/j.jtice.2020.02.006 |
| Popis: | Exploring bifunctional electrocatalysts with high activity for practical overall water splitting is urgent but challenging. Boosting low-cost catalysts with trace amount of noble metals supplies a promising scheme. Herein, Ru nanoparticles decorated Co(OH)2 nanosheet array on carbon cloth substrate (Ru-Co(OH)2/CC) is prepared via a two-step electrodeposition strategy. Trace Ru in the sample activates the bifunctionality of Co(OH)2 in alkaline media. For oxygen evolution, the synergism between Ru and Co(OH)2 can generate abundant oxygen vacancies for much improved catalysis activity, achieving low overpotential of 203 mV at 10 mA cm−2. For hydrogen evolution, Ru endows Co(OH)2 with Pt-like catalysis activity, for instance, the exchange current density of 1.32 mA cm−2 for Ru-Co(OH)2/CC that is comparable to that of Pt/C (1.44 mA cm−2), as well as low overpotential of 55 mV at 10 mA cm−2 that is close to that of Pt/C (35 mV). The excellent bifunctionality is demonstrated in a Ru-Co(OH)2/CC constructed two-electrode configuration. The robust catalytic activity (cell voltage of 1.54 V at 10 mA cm−2) with high durability of 60 h is obtained for overall water splitting. Moreover, a single AAA battery can drive the sustainable overall water splitting in such a cell. |
| Databáze: | OpenAIRE |
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