Fabrication of Bimetallic Oxides (MCo2O4: M=Cu, Mn) on Ordered Microchannel Electro-Conductive Plate for High-Performance Hybrid Supercapacitors

Mai Li,Zheyi Meng,Lianwei Wang,Kailan Zhu,Chunrui Wang,Jiale Wang,Fengfeng Zhao,Paul K Chu,Ruichao Feng

doi:10.3390/su13179896

Abstract

AB2O4-type binary-transition metal oxides (BTMOs) of CuCo2O4 and MnCo2O4 were successfully prepared on ordered macroporous electrode plates (OMEP) for supercapacitors. Under the current density of 5 mA cm−2, the CuCo2O4/OMEP electrode achieved a specific capacitance of 1199 F g−1. The asymmetric supercapacitor device prepared using CuCo2O4/OMEP as the positive electrode and carbon-based materials as the negative electrode (CuCo2O4/OMEP//AC) achieved the power density of 14.58 kW kg−1 under the energy density of 11.7 Wh kg−1. After 10,000 GCD cycles, the loss capacitance of CuCo2O4/OMEP//AC is only 7.5% (the retention is 92.5%). The MnCo2O4/OMEP electrode shows the specific and area capacitance of 843 F g−1 and 5.39 F cm−2 at 5 mA cm−2. The MnCo2O4/OMEP-based supercapacitor device (MnCo2O4/OMEP//AC) has a power density of 8.33 kW kg−1 under the energy density of 11.6 Wh kg−1 and the cycle stability was 90.2% after 10,000 cycles. The excellent power density and cycle stability prove that the prepared hybrid supercapacitor fabricated under silicon process has a good prospect as the power buffer device for solar cells.

Highlights

The nanoscale CuCo2 O4 is uniformly deposited on the surface of ordered macroporous electrode plates (OMEP), and the micropores of OMEP are retained, which is conducive to the transport of electrolytes inside the electrode
The results show that the cyclic voltammetry (CV) area of the CuCo2 O4 /OMEP electrode is slightly smaller than that of the MnCo2 O4 /OMEP electrode at low scanning speed (Figure 5a, 5 mV s−1 )
The results show that with the increase in scanning rate and current density, the surface capacity of the MnCo2 O4 /OMEP electrode decreases sharply

Summary

Introduction

With the continuous expansion of energy demand, as an important device to stabilize energy input and output, the research on energy storage components has become more and more the focus of future sustainable development [1]. After the solar cell generates electric energy, storing this energy through the energy storage system integrated with microelectronic technology to fulfill the stable and safe utilization of energy remains a challenge for the efficient application of solar energy [2,3]. The complex environment of solar cell power generation and storage is pursuing the characteristics of high-power density, long lifecycle and low cost, which are consistent with the research concept of electrode materials for supercapacitors [4]. Binary transition metal oxides (BTMOS) are Sustainability 2021, 13, 9896.

Methods

Results

Conclusion