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

• Main Authors: Mai Li, Zheyi Meng, Ruichao Feng, Kailan Zhu, Fengfeng Zhao, Chunrui Wang, Jiale Wang, Lianwei Wang, Paul K. Chu
• Format: Article
• Language: English
• Published: MDPI AG 2021-09-01
• Series: Sustainability
• Subjects: power buffer; silicon micromachining; bimetallic oxide; ordered macropore structure; electrochemical; supercapacitor
• Online Access: https://www.mdpi.com/2071-1050/13/17/9896

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.