3D MXene anchored carbon nanotube as bifunctional and durable oxygen catalysts for Zn–air batteries

Challenges for large scale applications of rechargeable Zn–air batteries

“…134 A lot of research about MXene-based cathodes has been done. [150][151][152] Zhang et al 153 prepared a two-dimensional MXene (Fe/Co-Fig. 11 Schematic diagram of the preparation and structure of "woody carbon nanolayers".…”

“…134 A lot of research about MXene-based cathodes has been done. 150–152 Zhang et al 153 prepared a two-dimensional MXene (Fe/Co-CNT@MXene-T) anchored CoFe nano-alloy modified carbon nanotube (CNT) 3D structure dual-function catalyst. Using the active site of CoFe nanoparticles, the strong sheath and fast charge transfer provided by carbon nanotubes and MXene, the Zn–air battery with this air electrode shows a capacity density of 759 mA h g −1 at 10 mA cm −2 , and a power density of 138 mW cm −2 at 250 mA cm −2 .…”

Material design and surface chemistry for advanced rechargeable zinc–air batteries

“…Recently, various nanostructured materials such as MOFs, COFs, and MXene have been used to achieve cost-effective and metal-free electrocatalysts and transition metal-based electrocatalysts. 96,97 MOFs are composed of metal nodes and organic ligands in 3D porous networks that can be extended from micropores to mesopores. This porous structure can be synthesized without the addition of surfactants to create metalorganic compositions with high surface areas.…”

Oxygen-Terminated Nb2CO2 MXene with Interfacial Self-Assembled COF as a Bifunctional Catalyst for Durable Zinc–Air Batteries

“…Since Yury first discovered a two-dimensional (2D) transition-metal carbide and named it MXene in 2011, MXenes family has received more and more enthusiastic research over the past 10 years. − MXenes not only have high specific surface area and high electrical conductivity but also have hydrophilicity and variable catalytic performance due to the adjustability of surface functional groups. MXenes have been widely studied in energy conversions, such as lithium–sulfur batteries, , Li–O 2 batteries, − and Zn–air batteries. , Recent research shows that the transition-metallic niobium in Nb 2 CT x (T = F, O, OH, etc.) has more unsaturated valence electrons and stronger metallicity than the widely studied Ti 3 C 2 T x .…”

“…MXenes have been widely studied in energy conversions, such as lithium−sulfur batteries, 12,13 Li−O 2 batteries, 14−16 and Zn−air batteries. 17,18 Recent research shows that the transition-metallic niobium in Nb 2 CT x (T = F, O, OH, etc.) has more unsaturated valence electrons and stronger metallicity than the widely studied Ti 3 C 2 T x .…”