In Situ Precipitation‐Induced Growth of Leaf‐like CuO Nanostructures on Cu–Ni Alloys for Binder‐Free Anodes in Li‐Ion Batteries

Abstract

CuC2O4⋅x H2O was facilely prepared on a Cu–Ni alloy substrate by in situ precipitation‐induced growth by using a mixture of sodium persulfate, hydrogen peroxide, and oxalic acid. Thermal annealing allowed the conversion of CuC2O4⋅x H2O to leaf‐like CuO nanostructures with a thickness of a few tens of micrometers of sub‐sized nanoparticles, which were applied for fabricating binder‐free anodes for lithium‐ion batteries. Ni was a nucleation site for CuC2O4⋅x H2O, which was uniformly formed on the entire substrate. The concentration of each component in the mixture solution caused significant morphological changes because of the different elution of copper ions. CuO nanostructures annealed at 550 °C showed large areal and gravimetric capacity with excellent capacity retention of 95.5 % after 200 cycles at a high current density because of their appropriate structural morphology, which not only allowed the formation of a stable solid electrolyte interphase layer but also enabled a reversible reaction during the charge/discharge process.

Ni0.67Fe0.33 Hydroxide Incorporated with Oxalate for Highly Efficient Oxygen Evolution Reaction

“…When metals have a more negative standard reduction potential than hydrogen, their cations are readily released into the solution through a redox reaction with hydrogen ions to form metal oxalates by simultaneous dissolution and precipitation, called in situ precipitation-induced growth in aqueous or organic-based oxalic acid solutions. ,− As shown in Figure S1, because the standard reduction potential of Ni 2+ /Ni [−0.26 V vs standard hydrogen electrode (SHE)] has a more negative potential than that of hydrogen, Ni 2+ is gradually released from the Ni foam substrate to form the Ni oxalate nanosheets on the Ni foam surface through the simple integration of Ni 2+ and C 2 O 4 2– at room temperature (eqs and ) . The diffraction peaks of the Ni oxalate can be indexed to orthorhombic NiC 2 O 4 ·2H 2 O (JCPDS 25-0581). …”

Three-dimensional clusters of peony-shaped CuO nanosheets as a high-rate anode for Li-ion batteries

“…4e). 18,[21][22][23][28][29][30][31][32][33] This is attributed to: (i) the distinctive structure of this three-dimensional peony-shape nanosheets facilitates the inltration of liquid electrolyte and provide more available interfaces for electrochemical reactions, thus accelerating electron/ion transfer; and (ii) the unique peony-like structure can also alleviate the severe volume expansion during charge/discharge process. The cycling durability of the TCP-CuO electrode was tested by rst discharging/charging at 0.1 A g À1 for 7 cycles and then 1 A g À1 for 100 cycles.…”

“…(d) Rate performance of the TCP-CuO electrode at various discharge rates. (e) Comparison of high rate property of the TCP-CuO electrode with other CuO-based electrodes, such as hollow CuO@C microsphere, 21 CuO leaf-like nanostructure, 25 Cu 2 O/CuO/rGO nanosheets, 26 CuO/Cu 2 O/C composites,27 CuO nanofibers,28 CuO nanowire arrays,18 CuO porous nanosheets,29 CuO nanochains, 22 yucca fern shaped CuO nanowires,30 and hollow urchinlike CuO microspheres 23. (f) Cycling performance of the TCP-CuO electrode as well as coulombic efficiency at 1 A g À1 .…”

“…CuO leaf-like nanostructure,25 Cu 2 O/CuO/rGO nanosheets,26 CuO/Cu 2 O/C composites,27 CuO nanofibers,28 CuO nanowire arrays,18 CuO porous nanosheets,29 CuO nanochains,22 yucca fern shaped CuO nanowires,30 and hollow urchinlike CuO microspheres 23. (f) Cycling performance of the TCP-CuO electrode as well as coulombic efficiency at 1 A g À1 .…”

Simple synthesis of novel Lanthanum doped Copper oxide nanoparticles for wastewater treatment: A comparison between Experiment and COMSOL simulation

“…Copper is one of the most inexpensive metal and has a diverse range of applications, including gas sensors (Mikami, Kido, Akaishi, Quitain, & Kida, 2019), lithium-ion batteries (Ha, Kim, & Choi, 2020;Lin et al, 2017), eld emission devices (Banerjee & Joo, 2011), antibacterial agents (Mary, Ansari, & Subramanian, 2019), dye-sensitized solar cells (Cao et al, 2017) Copper-based semiconductors do seem to have a small band gap that can be precisely tuned by using different methods to harvest wide range of natural/synthetic radiation (Salavati-Niasari & Davar, 2009).…”