Free-Standing Three-Dimensional CuCo₂S₄ Nanosheet Array with High Catalytic Activity as an Efficient Oxygen Electrode for Lithium–Oxygen Batteries

Abstract

In this work, a novel free-standing CuCo 2 S 4 nanosheet cathode (CuCo 2 S 4 @Ni) with high catalytic activity is fabricated for aprotic lithium−oxygen (Li−O 2 ) battery. This deliberately designed oxygen electrode is found to yield lower overpotential (0.82 V), improved specific capacity (9673 mA h g −1 at 100 mA g −1 ), and enhanced cycle life (164 cycles) as compared to the traditional carbonaceous electrode. The improved performance can be ascribed to the superb spinel structure of CuCo 2 S 4 , in which both Cu and Co exhibit more abundant redox properties, improving oxygen reduction reaction and oxygen evolution reaction kinetics effectively and boosting the electrochemical reactions. Furthermore, the welldesigned architecture also plays a critical role in the improved performance. Encouraged by the excellent catalytic activity of this free-standing cathode, large-scale pouch-type Li−O 2 cell based on CuCo 2 S 4 @Ni cathode is fabricated and can work under different bending and twisting conditions. This free-standing electrode provides a new strategy for developing Li−O 2 batteries with excellent performance and flexible wearable devices.

Metal chalcogenides for potassium storage

“…Kim's group employed NiS 2 nanosheets as cathode electrocatalysts, yielding a Li‐O 2 battery with a lifetime of more than 300 cycles . Other metal chalcogenide species have also proven to be beneficial for Li‐O 2 batteries, such as ZnCo 2 S 4 , CoNi 2 S 4 , and CuCo 2 S 4 …”

One‐Pot Synthesis of CuCo2S4 Sub‐Microspheres for High‐Performance Lithium‐/Sodium‐Ion Batteries

“…[12] Yu's group employed a facile in-situ template removal process to receive NiCo 2 S 4 @C hollow nanospheres consisted of ultrathin nanosheets, which achieved a high capacity of 1137 mA h g À 1 for LIBs. [14][15][16][17][18][19][20] Additionally, the merits of high specific capacity, excellent electronic conductivity, rich redox action sites also endowed CuCo 2 S 4 with a promising prospective in application of energy-storage batteries. [14][15][16][17][18][19][20] Additionally, the merits of high specific capacity, excellent electronic conductivity, rich redox action sites also endowed CuCo 2 S 4 with a promising prospective in application of energy-storage batteries.…”

“…[13] Among numerous TMS, copper cobalt sulfide (CuCo 2 S 4 ) had wide applications in supercapacitors, water oxidation electrocatalysis and photothermal therapy because of its unique physical and chemical properties. [14][15][16][17][18][19][20] Additionally, the merits of high specific capacity, excellent electronic conductivity, rich redox action sites also endowed CuCo 2 S 4 with a promising prospective in application of energy-storage batteries. Up to now, a few attempts have been devoted to developing CuCo 2 S 4 and its nanocomposites with various morphologies and structures as LIBs/SIBs electrode materials.…”

Porous Titanium Oxide Microspheres as Promising Catalyst for Lithium–Oxygen Batteries

“…The practical applications of Li–O 2 batteries have been restricted by many problems, including poor cycle stability, high overpotential during charging, and low charge/discharge rate . Therefore, it is essential to develop a highly efficient catalyst for promoting the rapid formation and oxidative decomposition of lithium peroxide (Li 2 O 2 ) …”