Hollow nickel nanocorn arrays as three-dimensional and conductive support for metal oxides to boost supercapacitive performance

Abstract

A novel three-dimensional (3D) metal/metal oxide core/branch array electrode has been fabricated as a supercapacitor electrode. Hollow Ni nanocorn arrays are constructed on Ni foams and act as a highly conductive and stable support to Co3O4 nanoflakes. Enhanced pseudocapacitive performance compared to bare Co3O4 nanosheets is demonstrated with high rate capability and excellent cycling stability.

A Novel Exfoliation Strategy to Significantly Boost the Energy Storage Capability of Commercial Carbon Cloth

“…Significantly, the EACC‐10 electrode achieved a high areal capacitance of 756 mF cm −2 at a current density of 6 mA cm −2 , which is 2220 and 10.5 times higher than that of untreated CC (0.34 mF cm −2 ) and chemically activated CC (72 mF cm −2 ) in our previous work . Furthermore, this present areal capacitance obtained at such a high discharge current density is also substantially higher than the values of recently reported carbon‐based materials and some metal oxides anodes, such as CNT film (113 mF cm −2 at 5 mA cm −2 ), Fe 2 O 3 nanotube (145 mF cm −2 at 5 mA cm −2 ), WO 3‐ x /MoO 3‐ x (303 mF cm −2 at 5 mA cm −2 ), V 2 O 5 ‐PANI (421.5 mF cm −2 at 5 mA cm −2 ), Ni/Co 3 O 4 (410 mF cm −2 at 5.6 mA cm −2 ) and it is even comparable to the NiCo 2 O 4 electrode (858.3 mF cm −2 at 6.7 mA cm −2 ) . In addition, the EACC‐10 possessed a prominent rate capability with more than 65.2% retention of its initial capacitance as the current density increased from 6 to 20 mA cm −2 .…”

Engineering Ultrathin Co(OH)2 Nanosheets on Dandelion–like CuCo2O4 Microspheres for Binder‐Free Supercapacitors

“…Numerous inter‐spaces of the Co(OH) 2 nanoflakes facilitated the ion transport. Nevertheless, the gaps between the nanoflakes are almost filled with redundant Co(OH) 2 nanosheets with the sequentially increasing of the deposition time, leading to the degradation of the electrochemical properties . Furthermore, the detailed comparison data of the electrochemical performance for the CuCo 2 O 4 @Co(OH) 2 electrodes prepared with different deposition time is summarized in Table .…”

Hierarchical polypyrrole based composites for high performance asymmetric supercapacitors

“…[26][27] In our previous work, we demonstrated novel 3D-Ni@MnO 2 , [28] 3D-Ni@Ni(OH) 2 [29] and 3D-Ni@PPy [30] composites for supercapacitors with high C sp and remarkable cycling stability. In this work, the composites of 3D chuzzle-like Ni@PPy@MnO 2 and 3D cochleate-like Ni@MnO 2 @PPy based on 3D Ni metal framework were prepared by simply changing the order of electrodeposition.…”