Flexible Bimetallic Nanoporous Cu-Ag Synthesized by Electrochemical Dealloying for Battery-Type Electrodes with High Electrochemical Performance

In Situ Engineering of the Core–Shell Ag@Cu Structure on Porous Nanowire Arrays for High Energy and Stable Aqueous Ag–Bi Batteries

“…The Cu 2p orbital linear mainly split into Cu 2p 3/2 (∼932.5 eV) and Cu 2p 1/2 (∼952.4 eV) peaks accompanied by two satellite bands, indicating the signal of metallic Cu. 22 The peaks of Ag 3d 3/2 and 3d 5/2 are located at 374.4 and 368.3 eV, respectively, confirming the presence of metallic Ag in the Ag@Cu NWAs. 29 Hence, combing with the SEM and TEM measurement result, it can be confirmed that the expected porous core−shell Ag@Cu NWA electrode material has been fabricated successfully.…”

“…The high resolution XPS spectrum reveals the Cu 2p and Ag 3d core level spectra in Figure c,d. The Cu 2p orbital linear mainly split into Cu 2p 3/2 (∼932.5 eV) and Cu 2p 1/2 (∼952.4 eV) peaks accompanied by two satellite bands, indicating the signal of metallic Cu . The peaks of Ag 3d 3/2 and 3d 5/2 are located at 374.4 and 368.3 eV, respectively, confirming the presence of metallic Ag in the Ag@Cu NWAs .…”

“…Subsequently, the high resolution TEM (HRTEM) measurement further characterized the interior fine structure of the above nanoparticle (the red circle area of Figure 2f). Figure 2g displays clearly the core−shell layers and the interplanar distance from adjacent fringes is 0.236 and 0.208 nm, indexed to the (111) planes of fcc Ag and fcc Cu 22,26 respectively, which illustrates the definite hierarchical core−shell Ag@Cu architecture and about ∼7 nm thickness of the Ag shell layer. In agreement with HRTEM result, the selected area electron diffraction (SAED) pattern reveals two kinds different characteristic single crystalline diffraction stripe (Figure 2h), which can be index to the (220) plane of fcc Ag and the (200) plane of fcc Cu, respectively.…”

“…The recently developed nanomaterials and nanotechnology have enabled the revisitation of traditional metallic materials . Generally, nanostructured metallic materials of an intrinsically large specific surface area and extraordinary electrical conductivity are superior candidates as substrates for loading the capacitive or battery-type electrode materials with relatively high resistance such as metal oxides . Nanoscale copper materials (Cu) with a reasonable architecture has attracted considerable attention as the support of active materials because of high electrical conductivity, superior mechanical flexibility, and minimal environment impact.…”

“…21 Generally, nanostructured metallic materials of an intrinsically large specific surface area and extraordinary electrical conductivity are superior candidates as substrates for loading the capacitive or battery-type electrode materials with relatively high resistance such as metal oxides. 22 Nanoscale copper materials (Cu) with a reasonable architecture has attracted considerable attention as the support of active materials because of high electrical conductivity, superior mechanical flexibility, and minimal environment impact. In addition, Ag nanomaterials, which present higher surface activity and utilization of Ag active materials compared to bulk Ag, have bathed in the limelight as a decent electrode for Ag−Zn batteries and supercapacitors.…”