Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 27, Pages 13994-14002Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02215h
Keywords
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Funding
- National Natural Science Foundation of China [21403280, 21401083]
- SKL of Xiamen University of China [201509]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2017R1A2B3006941]
- National Research Foundation of Korea [2017R1A2B3006941] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, we demonstrate a three birds one stone strategy for preparing 1D N-doped porous carbon nanotubes embedded with core-shell Co@CoOx nanoparticles (Co@CoOx/NCNTs) from bimetallic ZnO@Zn/Co-ZIF nanowires. The ZnO nanowires played three roles: (i) ZnO acted as a template for 1D metal-organic framework (MOF) growth, (ii) in situ evaporation of Zn during pyrolysis prevented the aggregation of the carbon framework and benefited the formation of hierarchical pores, and (iii) the excess Oxygen species released from ZnO in situ reacted with metallic cobalt nanoparticles during pyrolysis, leading to the configuration of a Co@CoOx core-shell structure. The as-prepared 1D Co@CoOx/NCNTs exhibited excellent oxygen reduction reaction performance, including a high kinetic current (4.6 times better compared to 20 wt% Pt/C at 0.7 V), a low Tafel slope of 80 mV dec(-1), outstanding stability, and strong tolerance to CH3OH crossover. The assembled Zn-air batteries with Co@CoOx/NCNTs yielded high open-circuit voltage (1.52 V), superior stability (over 100 h of operation), and unprecedented rate performance that ranged from 1 to 500 mA cm(-2), while existing batteries have never achieved a galvanostatic discharge current density larger than 300 mA cm(-2). Such exceptional rate capability was ascribed to the formation of a uniform interconnected nanotube network, facilitated electron transport, and an enlarged electrochemically accessible surface area in the unique 1D porous tubular structure.
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