Co₃O₄ Exsolved Defective Layered Perovskite Oxide for Energy Storage Systems

Abstract

We report a Co 3 O 4 exsolved perovskite oxide PrBaMn 1.7 Co 0.3 O 5+δ (Co 3 O 4 −PBMCO) that utilizes the Faradaic transfer of metal oxide and favorable OH − adsorption for an energy storage mechanism, as an active material for hybrid supercapacitors. It demonstrated electrochemical performances supported by both fast oxygen anion intercalation in the interior and Faradaic redox reaction on the surface of the active material, Co 3 O 4 −PBMCO. The flexible hybrid supercapacitor, Co 3 O 4 −PBMCO, coated onto the three-dimensional nickel wire (3D-Ni), exhibited outstanding capacitance (capacity) of 1571 F g −1 (218.54 mAh g −1 ), good rate capability, and cycle stability.With these performances, the hybrid device exhibited a high energy density of 215.80 Wh kg −1 and a power density of 1.48 kW kg −1 , which are significantly higher than those of previously reported perovskite oxide-based electrodes. These results verified that our unique metal oxide exsolved layered perovskite oxide is a promising candidate as an active material for hybrid devices that can be widely applied for smart wearable and implantable devices.

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

“…Reproduced with permission. [ 289 ] Copyright 2020, American Chemical Society. g) CV curves of TNO x G, graphene, and TNOG electrodes at 5 mV s −1 .…”

“…Perovskite oxides with abundant vacancies possess favorable thermal/electrochemical stability and high O 2− diffusion. As shown in Figure 11d, Jang's group [ 289 ] fabricated Co 3 O 4 exsolved perovskite oxide PrBaMn 1.7 Co 0.3 O 5+ δ (Co 3 O 4 –PBMCO) electrode, which possessed a large number of vacancies owing to Co segregation. The existence of vacancies lowered the activation energy for oxygen anion diffusion into the bulk electrode.…”

High-Performance-Based Perovskite-Supported Nanocomposite for the Development of Green Energy Device Applications: An Overview

“…Herein, Li 3 x − y La 1− x Ti x O 3 type perovskite-based solid electrolytes have been used as the base materials for Li-ion conductivity (4.53 10 −4 S cm −1 ), with discharge capacity value of 107.6 mA hg −1 [ 163 ]. Kang et al [ 164 ] developed the 3D-layered structured PrBaMn 1.7 Co 0.3 O 5+δ (Co 3 O 4 -PBMCO) composite as a promising reference active material. It had vacancy-accelerated properties with outstanding specific capacity (1571 F g −1 ), and good cyclic stability ( Figure 13 ).…”

“… ( a ) Schematic of energy storage mechanism for PBM and Co 3 O 4 −PBMCO; ( b ) SEM image of PBM; ( c ) HR-TEM images of Co 3 O 4 -PBMCO; ( d ) digital-camera image of a green LED powered by two wire-type hybrid devices connected in series; and ( e ) cycling performance of the hybrid device for 20,000 cycles. Copyright 2020 by the American Chemical Society [ 164 ]. …”

Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites

“…Tailoring the functionality of perovskite oxides (ABO3) by decorating the surface with catalytically active particles plays an important role in energy-related applications such as fuel cells, electrolysis cells, metal-air batteries, and supercapacitors [1][2][3][4][5][6] . The catalyst particles are typically prepared by deposition techniques (e.g.…”