Fabrication of 3D microporous Ni foam for growing CoMoO4 nanosheet arrays as high-performance pseudocapacitive electrode

• Published in: Materials letters Vol. 324; p. 132613
• Main Authors: Sun, Haitao, Xiao, Yaru, Zhang, Yi, Liu, Xiangqing, Zhao, Shan, Zhang, Shaofei, Li, Tiantian, Sun, Jinfeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-10-2022
• Subjects: CoMoO4 nanosheet; Energy storage and conversion; Microstructure; Rapid electron/ion transportation; Microstructure; Rapid electron/ion transportation; CoMoO4 nanosheet; Energy storage and conversion
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2022.132613

A 3D porous Ni foam with pore size in the range of several micrometers can accommodate more CoMoO4 nanosheet arrays in a limited area with merit of high-efficient electron/ion transportation, thus leading to a high areal performance as pseudocapacitive electrode.
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•A novel 3D porous Ni foam current collector is fabricated by a scale-up method.•The interconnected pores can be controlled to accommodate electroactive materials with different mass loading values.•The 3DNF@CMO enables a shortened and homogeneous electron/ion transfer pathway.
A 3D porous Ni foam (3DNF) with pore and ligament size in the ranging of several micrometers is fabricated via a method of combining nonsolvent induced phase separation (NIPs) and solid-state sintering. Benefiting from the interconnected pores, the pseudocapacitive CoMoO4 nanosheet arrays can grow on the unique 3DNF (3DNF@CMO) with loading mass of 3.2 mg cm−2. The 3DNF can act as a connection between internal and external circuit, ensuring rapid and stable electron/ion transfer. Because of these merits, the 3DNF@CMO-8 electrode shows a high area capacitance of 1.53F cm−2 at 3 mA cm−2 and long lifespans surpassing 8000 cycles. These results highlight the importance of rational design of 3D current collectors and reveal a promise for developing idea electrodes for energy storage systems.