Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 828, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154435
Keywords
Fe catalyst; Oxygen reduction; N-doped carbon nanotubes; Zn-air battery
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Funding
- National Natural Science Foundation of China [21506086, 21776119, 21606033, 21606115]
- Postgraduate Research and Practice Innovation Program of Jiangsu Province
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Developing low-cost nonprecious metal catalysts with excellent activity and high durability for oxygen reduction reaction (ORR) is greatly imperative but challenging. Here, a high-performance ORR catalyst is designed based on in-situ grown bamboo-like N-doped carbon nanotubes with encapsulated Fe-based nanoparticles (Fe@B-NCNTs). The architecture of the 1D hierarchical porous nanotubes, large surface area with abundant defects and active sites, and strong coupling interactions between the enclosed metal-cluster core and the N-doped graphitic carbon shell synergistically enhance the electrocatalytic activity. As a result, Fe@B-NCNTs exhibit a more positive half-wave potential (0.898 V vs. the reversible hydrogen electrode, RHE), higher electrochemical stability and more superior resistance to methanol crossover than those of Pt/C in an alkaline electrolyte. Interestingly, when acting as a cathode electrocatalyst for a primary Zn-air battery (ZAB), Fe@B-NCNTs display a peak power density of similar to 147 mW cm(-2) and a first-class specific energy density of similar to 921 Wh kg(Zn)(-1) at a discharge current density of 20 mA cm-2. Moreover, a proof-of-concept solid-state ZAB with bendable ability demonstrates the application potential in portable and wearable electronic devices. (C) 2020 Elsevier B.V. All rights reserved.
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