Ultrathin Co₃O₄ Layers with Large Contact Area on Carbon Fibers as High‐Performance Electrode for Flexible Zinc–Air Battery Integrated with Flexible Display

Abstract

A facile and binder-free method is developed for the in-situ and horizontal growth of ultrathin mesoporous Co 3 O 4 layers on the surface of carbon fibers in the carbon cloth (ultrathin Co 3 O 4 /CC) as high-performance air electrode for the flexible Zn-air battery. In particular, the ultrathin Co 3 O 4 layers have a maximum contact area on the conductive support, facilitating the rapid electron transport and preventing the aggregation of ultrathin layers. The ultrathin feature of Co 3 O 4 layers is characterized by the transmission electron microscopy, Raman spectra and X-ray absorption fine structure spectroscopy. Benefiting from the high utilization degree of active materials and rapid charge transport, the mass activity for oxygen reduction and evolution reactions of the ultrathin Co 3 O 4 /CC electrode is more than 10 times higher than that of the carbon cloth loaded with commercial Co 3 O 4 nanoparticles. Compared to the commercial Co 3 O 4 /CC electrode, the flexible Znair battery using ultrathin Co 3 O 4 /CC electrode exhibits excellent rechargeable performance and high mechanical stability. Furthermore, the flexible Zn-air battery was integrated with a flexible display This article is protected by copyright. All rights reserved.3unit. The whole integrated device can operate without obvious performance degradation under serious deformation and even during the cutting process, which makes it highly promising for wearable and roll-up optoelectronics.

CuCo2S4 Nanosheets@N‐Doped Carbon Nanofibers by Sulfurization at Room Temperature as Bifunctional Electrocatalysts in Flexible Quasi‐Solid‐State Zn–Air Batteries

“…This interfacial interplay could manifestly promote the charge transport in CuCo 2 S 4 NSs, and effect synergistically with the superior electrical conductivity N-CNFs to further enhance the air cathode's ORR/OER performances. The dominant peaks at around 1.82 Å can be attributed to the CoS bond, while the peak around 1.58 Å is related to the CoO bond, [7] confirming the successful sulfurization to CuCo 2 S 4 NSs from CuCo 2 O 4 NPs, which has also been confirmed by the EXAFS spectrum at Cu K-edge in R-space (Figure 4d). This also well explains why the CuCo 2 S 4 NSs@N-CNFs film cathode shows a lower charge transfer resistance (R ct ) than the CuCo 2 S 4 NSs powder-based cathode in Figure S15 (Supporting Information).…”

“…[1][2][3][4][5][6][7][8] In principle, the advancement of flexible ZABs is critically dependent on the availability of desired air electrodes with excellent bifunctional electrocatalysis for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), together with robust flexibility and mechanical strength. [1][2][3][4][5][6][7][8] In principle, the advancement of flexible ZABs is critically dependent on the availability of desired air electrodes with excellent bifunctional electrocatalysis for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), together with robust flexibility and mechanical strength.…”

Rapid Thermal Treatment of Reactive Sputtering Grown Nanocrystalline Co3 O4 for Enhanced All-Oxide Photovoltaics

“…Ab initio studies suggest there are challenges associated with fabricating a quality p‐type Co 3 O 4 material with fewer defects and high mobility, and these properties are essential to enhancing the performance of the all‐oxide photovoltaic . The spinel‐type Co 3 O 4 nanocrystals are also a potential alternative for the renewable‐energy technologies such as fuel cell and energy storage …”

Advances in the development of power supplies for the Internet of Everything

“…With the ever‐growing demand for flexible and wearable electronics, power supplies based on semi‐solid/solid electrolytes have received extensive attention . Based on different battery systems, the utilization of semi‐solid/solid electrolytes poses great challenges on battery lifetimes, such as the electrolyte loss in the half‐opened metal‐air batteries, “polysulfide shuttle” problems in lithium‐sulfur batteries and kinetic degradation problems of almost all kinds of batteries under mechanical deformation conditions . The development of power supply units for IoE devices requires the rational design of both high‐performance materials and overall battery structures as well as the development of new power sources or power mechanisms to realize sustainable, maintenance‐free, and continuous operation.…”