Structurally tailored 3D porous Co current collector with surface growth of CoOx nanosheet arrays for supercapacitor and OER application
The full exploitation of free-standing, three-dimensional (3D) current collectors is pivotal for enhancing the mass loading of active materials and improving electronic conductivity in high-performance electrochemical energy storage and conversion applications, yet it remains a considerable challeng...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Next Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S294982282500259X |
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| Summary: | The full exploitation of free-standing, three-dimensional (3D) current collectors is pivotal for enhancing the mass loading of active materials and improving electronic conductivity in high-performance electrochemical energy storage and conversion applications, yet it remains a considerable challenge. This study introduces a micron-sized porous cobalt film (3DPCo) with in-situ grown CoOx nanosheets (3DPCo@CoOx), serving as bifunctional electrodes for both supercapacitor and water oxidation. The active CoOx loading on the 3DPCo (∼400 μm) reaches 16.9 mg cm−2, which is 2.35 times higher than that of a commercial Co foam-supported CoOx electrode (∼7.2 mg cm−2 with a thickness of 1.5 mm). Additionally, the 3D electrode boasts a bi-continuous architecture, offering void spaces between the Co core and CoOx nanosheet shell, facilitating rapid ion/electron transport, fast redox reaction kinetics, and ample active sites. The optimized 3DPCo@CoOx-2 electrode exhibits a high areal capacitance of 703.8 mF cm−2 at 5 mA cm−2, with outstanding stability over 10,000 cycles. When employed in an asymmetric 3DPCo@CoOx-2//AC hybrid supercapacitor, it achieves a high energy density of 693 μWh cm−2 at a power density of 0.33 W cm−2. As an OER electrocatalyst for water splitting, it demonstrates an overpotential of 256 mV at 10 mA cm−2 and a Tafel slope of 94.5 mV dec−1. |
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| ISSN: | 2949-8228 |