Co2P@N,P-Codoped Carbon Nanofiber as a Free-Standing Air Electrode for Zn–Air Batteries: Synergy Effects of CoNx Satellite Shells
| Autor: | Mingzhen Hou, Lijun Zhou, Da Zhan, Jinming Wang, Xiaoyi Cai, Linfei Lai, Jingchang Gao |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Carbon nanofiber Phosphide Oxygen evolution chemistry.chemical_element 02 engineering and technology Overpotential Nitride 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electrospinning 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Nanofiber General Materials Science 0210 nano-technology Cobalt |
| Zdroj: | ACS Applied Materials & Interfaces. 11:10364-10372 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b20003 |
| Popis: | Here, a free-standing electrode composed of cobalt phosphides (Co2P) supported by cobalt nitride moieties (CoNx) and an N,P-codoped porous carbon nanofiber (CNF) in one-step electrospinning of environmentally friendly benign phosphorous precursors is reported. Physiochemical characterization revealed the symbiotic relationship between a Co2P crystal and surrounding nanometer-sized CoNx moieties embedded in an N,P-codoped porous carbon matrix. Co2P@CNF shows high oxygen reduction reaction and oxygen evolution reaction performance owing to the synergistic effect of Co2P nanocrystals and the neighboring CoNx moieties, which have the optimum binding strength of reactants and facilitate the mass transfer. The free-standing Co2P@CNF air-cathode-based Zn-air batteries deliver a power density of 121 mW cm-2 at a voltage of 0.76 V. The overall overpotential of Co2P@CNF-based Zn-air batteries can be significantly reduced, with low discharge-charge voltage gap (0.81 V at 10 mA cm-2) and high cycling stability, which outperform the benchmark Pt/C-based Zn-air batteries. The one-step electrospinning method can serve as a universal platform to develop other high-performance transition-metal phosphide catalysts benefitting from the synergy effect of transition nitride satellite shells. The free-standing and flexible properties of Co2P@CNF make it a potential candidate for wearable electronic devices. |
| Databáze: | OpenAIRE |
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