Cu-based materials as high-performance electrodes toward electrochemical energy storage

Abstract

Cu-based materials, including metal Cu and semiconductors of Cu 2 O and CuO, are promising and important candidates toward practical electrochemical energy storage devices due to their abundant, low cost, easy synthesis and environmentally friendly merits. This review presents an overview of the applications of Cu-based materials in the state-of-art electrochemical energy storage, including both lithium-ion batteries and supercapacitors. The synthesis chemistry, structures and the corresponding electrochemical performances of these materials are summarized and compared. During chemical synthesis and electroactive performance measurement of Cu-based materials, we found that Cu-Cu 2 O-CuO sequence governs all related transformations. Novel water-soluble CuCl 2 supercapacitors with ultrahigh capacitance were also reviewed which can advance the understanding of intrinsic mechanism of inorganic pseudocapacitors. The major goal of this review is to highlight some recent progresses in using Cu-based materials for electrochemical energy storage.

Commercial Dacron cloth supported Cu(OH)2 nanobelt arrays for wearable supercapacitors

“…have attracted much attention as pseudocapacitor electrode materials because they are chemically stable, of low cost, and environmentally friendly. [24][25][26][27][28][29] Particularly, using Cu(OH) 2 , Gurav et al have synthesized Cu(OH) 2 lms on glass and stainless steel substrates, 27 and Xu et al have fabricated Cu(OH) 2 nanowire arrays on copper foil. 28 However, it is obvious that these substrates are not suitable for constructing wearable devices.…”

Dealloying of Cu-Based Metallic Glasses in Acidic Solutions: Products and Energy Storage Applications

“…Xue et al [ 81 ] found that Cu 2 O, the initially formed product of Cu oxidation in air or oxygen atmosphere, can spontaneously grow at the surface of Cu foil in Cl − solutions at room temperature. By adjusting concentrations of Cl − ions, Cu 2 O crystals with various shapes including octahedra, rhombic dodecahedra and spheres are produced and can be tailored on the surface of Cu foil.…”

Flexible and ultralong-life cuprous oxide microsphere-nanosheets with superior pseudocapacitive properties

“…35,36 Xiang et al 37 fabricated core-shell Cu 2 O/Cu composites towards Li-ion batteries application by a special reduction process of CuSO 4 . 35,36 Xiang et al 37 fabricated core-shell Cu 2 O/Cu composites towards Li-ion batteries application by a special reduction process of CuSO 4 .…”