Chromium ions–doped titanium nitride/nitrogen-doped carbon composites as oxygen electrocatalyst for high-performance Zn–Air battery
Ionics, ISSN: 1862-0760, Vol: 29, Issue: 10, Page: 4077-4086
2023
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Most Recent News
New Chemicals and Chemistry Findings Has Been Reported by Investigators at Kunming University (Chromium Ions-doped Titanium Nitride/nitrogen-doped Carbon Composites As Oxygen Electrocatalyst for High-performance Zn-air Battery)
2023 SEP 22 (NewsRx) -- By a News Reporter-Staff News Editor at Chemicals & Chemistry Daily Daily -- Current study results on Chemicals and Chemistry
Article Description
Recently, transition metal nitrides (TMNs) are a suitable candidate for electrode materials due to their high conductivity, large surface area, electronic structure, and interesting mechanical properties. However, the activity of oxygen reduction reaction (ORR) is too poor to meet the performance and cost requirements in zinc–air batteries. Doping with the other foreign atoms can optimize the structure and performance of TMNs. In this paper, the d-band center of titanium nitride (TiN) was regulated by introducing Cr ions into the lattice, which can lower the energy barrier of the rate determination step (RDS). Moreover, the degree of graphitization of carbon materials and the surface area can be optimized directly by doping amount of chromium into the lattice of TiN. Benefiting from that, the TiCrN/NC/C exhibited an onset potential as high as 0.854 V, an ultimate current density of 4.1 mA·cm, remarkable stability and durability. The zinc–air battery based with TiCrN/NC/C has 1.25 V open-circuit voltage, a 760.26 mAh·g specific capacity, and excellent long-time discharge performance. This work provides a reliable way to develop stable and efficient binary transition metal nitride electrocatalysts. Graphical abstract: [Figure not available: see fulltext.]
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Springer Science and Business Media LLC
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