Reduced Co₃O₄ nanowires with abundant oxygen vacancies as an efficient free-standing cathode for Li–O₂ batteries

Abstract

The reduced Co3O4 cathode with abundant oxygen vacancies significantly improves the battery's cycling stability.

Tunable Cationic Vacancies of Cobalt Oxides for Efficient Electrocatalysis in Li–O2 Batteries

“…[ 2 ] The spectrum of O 1s (Figure 2f) can be deconvoluted into three peaks at around 529, 531, and 532 eV, which are associated with the lattice oxygen, surface absorbed oxygens, and water molecules, respectively. [ 44,45 ]…”

“…[2] The spectrum of O 1s (Figure 2f) can be deconvoluted into three peaks at around 529, 531, and 532 eV, which are associated with the lattice oxygen, surface absorbed oxygens, and water molecules, respectively. [44,45] To examine the electrocatalytic performance, the Co-300, Co-400, Co-500, Co-600, and Co-700 were used as cathode catalysts to fabricate Li-O 2 batteries. Figure 3a; and Figure S10a (Supporting Information) show the initial galvanostatic .…”

Recent Development of Flexible and Stretchable Supercapacitors Using Transition Metal Compounds as Electrode Materials

“…Co 3 O 4 faces challenges from its poor rate performance and cycling stability, attributed to the sluggish electron transfer kinetics and sluggish ion‐diffusion rate. Enormous efforts have been made to alleviate these issues, including creating oxygen vacancy, [ 165–169 ] element doping, [ 31,170–172 ] forming composites with conductive polymers, [ 113,115,144 ] and designing nanostructure. [ 173–178 ] Doping Co 3 O 4 with heteroatoms can tailor its surface electronic structure and thereby enhance its electrochemical activity.…”

Embedded Growth of Li2O2 Achieved by a Rational Designed Three‐Dimensional Fe2O3@CNS‐CNTs Sandwich Structure for Improving the Performance of Li–O2 Batteries

“…Highly expected to address the aforementioned problems is designing an ideal catalytic cathode architecture to enhance the oxygen redox kinetics and improve the electrochemical performances. [ 15,16 ] In this regard, constructing hierarchical porous structure with suitable catalyst components holds promising potential. For example, Wang and co‐workers constructed a 3D hierarchical NiCo 2 S 4 @NiO heterostructure with dendritic array network for charge diffusion pathways and sufficient spaces for Li 2 O 2 storage, the cathode based on which could yield much improved overpotential, discharge capacity, rate capability, and cycle stability for Li–O 2 battery.…”