AI Article Synopsis
- The research focuses on creating hollow and porous Co@CoO nanoparticles embedded in nitrogen-doped carbon nanotubes (N-CNTs) to enhance lithium-ion battery performance and hydrogen evolution reaction (HER).
- Utilizing a two-step calcination process, the study explores the formation mechanism and how oxygen vacancies affect the electrochemical performance of these electrodes.
- The Co@CoO@N-CNTs demonstrate exceptional catalytic activity for HER with a lower onset overpotential (296 mV) and show impressive discharge capacity after 600 cycles, highlighting their potential for high-rate and stable energy storage systems.
Article Abstract
The design and synthesis of hollow and porous nanostructured electrode materials is an effective strategy to improve the electrochemical performance of lithium-ion batteries and the hydrogen evolution reaction (HER). Herein, we synthesize hollow and porous Co@CoO nanoparticles embedded in N-doped CNTs (N-CNTs) with rich surface defects through a two-step calcination strategy. The formation mechanism is explored. The influence of oxygen vacancies regulated by the nanoscale Kirkendall effect on the electrochemical performance of the electrode is elucidated. The Co@CoO@N-CNTs exhibit remarkable activity for catalyzing the HER with a low onset overpotential of 296 mV (a low Tafel slope of 116.2 mV dec), much better than CoO@N-CNTs (315 mV for overpotential and 124.2 mV dec for Tafel slope). Significantly, the Co@CoO@N-CNTs deliver a high discharge capacity of 990 mA h g after 600 cycles at 0.1 A g. Our nanostructure strategy can provide new insights into the strategy for high-rate and highly stable energy storage systems.
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| http://dx.doi.org/10.1021/acs.inorgchem.2c03492 | DOI Listing |
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