A strategy for fabricating three-dimensional porous architecture comprising metal oxides/CNT as highly active and durable bifunctional oxygen electrocatalysts and their application in rechargeable Zn-air batteries
Autor: | Ju Hyeong Kim, Gi Dae Park, Yun Chan Kang, Jung-Kul Lee, Jun Yeob Lee, Jeong Hoo Hong |
---|---|
Rok vydání: | 2021 |
Předmět: |
Nanotube
Materials science General Chemical Engineering Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Chemical engineering Environmental Chemistry Nanorod 0210 nano-technology Bifunctional Polarization (electrochemistry) Carbon |
Zdroj: | Chemical Engineering Journal. 414:128815 |
ISSN: | 1385-8947 |
Popis: | Approaches to structural and compositional modifications of non-noble metal oxygen reduction reaction and oxygen evolution reaction electrocatalysts are essential for advanced rechargeable Zn-air batteries (ZABs). In this work, three-dimensional (3D) porous carbon nanotube (CNT) microsphere prepared by spray pyrolysis are used as conductive carbon framework. MnO2 and Fe2O3 nanorods are uniformly deposited on rationally designed CNT microsphere via a two-step bottom-up processing; through the formation of 3D porous architecture, electron transfer and mass transport can be facilitated. Due to the synergetic effect of uniformly deposited MnO2 and Fe2O3 nanorods and 3D porous architecture of CNT framework, MnO2-Fe2O3/CNT exhibited superior oxygen reduction/evolution catalytic activities under alkaline media comparing to Pt/C-RuO2. Moreover, as a bifunctional electrocatalyst for ZABs, MnO2-Fe2O3/CNT delivered high power density of 253 mW cm−2, specific capacity of 802 mA h g−1, and low polarization potential difference, as well as long-term cycling stability up to 3600 min. |
Databáze: | OpenAIRE |
Externí odkaz: |