A free-standing biomass-derived RuO2/N-doped porous carbon cathode towards highly performance lithium-oxygen batteries
| Autor: | Chunmei Liu, Youcai Lu, Zhongjun Li, Xiaodan Zhu, Qingchao Liu, Yuan Shang |
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| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Carbonization Energy Engineering and Power Technology Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Catalysis chemistry Chemical engineering law Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Mesoporous material |
| Zdroj: | Journal of Power Sources. 471:228444 |
| ISSN: | 0378-7753 |
| Popis: | The development of efficient cathode is critical to achieving high-performance lithium-oxide (Li–O2) batteries. Herein, N-doped hierarchical mesoporous activated carbon (N-HMACs) are synthesized from commercially available apples via pyrolysis and carbonization strategy, on this basis, a free-standing cathode of RuO2 nanoparticles (RuO2 NPs) anchored on as-prepared N-HMACs is obtained via subsequent solvothermal process (N-HMACs-RuO2), which avoids the parasitic reaction caused by binder and facilitates electron transport. The porous structure of the cathode provides sufficient transfer channels for reactants and affords space for product accommodation. While the anchored RuO2 NPs not only serve as catalytic sites to accelerate O2 reduction/evolution kinetics but also optimize the reaction process, making it more susceptible to form sheet-like Li2O2 by the surface-adsorption pathway, which is further confirmed by density functional theory (DFT) calculations. As a result, the assembled Li–O2 battery with N-HMACs-RuO2 cathode displays enhanced electrochemical performances, including high capacity, low over-potential, and outstanding cycling stability. |
| Databáze: | OpenAIRE |
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