Nature-inspired Cu2O@CoO tree-like architecture for robust storage of sodium

doi:10.1016/j.jmst.2020.02.077

Abstract

Abstract:

We report a nature-inspired design of tree-like architecture of cuprous oxide (Cu₂O) stem and cobalt oxides (CoO) branch serving as an efficient anode for sodium-ion batteries. The construction of stem-branch architectures involves the growth of Cu₂O nanorods and the subsequent deposition of CoO nanowires. Due to abundant active sites and full exposure to electrolyte, such a Cu₂O@CoO stem-branch architecture demonstrates a robust storage toward Na⁺ ions, affording a capacity retention of ~100% over 300 continuous cycles and a remarkable rate capability of 296 mAh g^-1 at 1 A g^-1. This result clearly shows the potential of nature-inspired materials engineering may find extensive applications in the design of high-performance electrodes for rechargeable batteries.

Key words: Nature-inspired design, Architecture, Cuprous oxide, Sodium-ion battery

Zhenzhu Wang, Menglei Sun, Jiangfeng Ni, Liang Li. Nature-inspired Cu₂O@CoO tree-like architecture for robust storage of sodium[J]. J. Mater. Sci. Technol., 2020, 53: 126-131.

Figures/Tables 6

Fig. 1. Schematic of the synthesis of tree-like Cu2O@CoO architecture. CBD denotes chemical bath deposition.

Fig. 2. Morphological characterization of Cu2O@CoO: SEM images of (a) top view and (b) side view. (c) TEM image showing a single Cu2O nanorod attached with numerous CoO nanowires; (d) EDS elemental mapping of O, Co, and Cu; (e-g) High-resolution TEM images of showing the lattice fringes of (f) CoO and (g) Cu2O.

Fig. 3. Structural characterization: (a) XRD patterns of Cu2O@CoO, Cu2O nanorod and CoO nanowire; Core-level XPS spectra of (b) O 1s, (c) Cu 2p3/2, and (d) Co 2p for Cu2O@CoO.

Fig. 4. Electrochemical sodium storage in Cu2O@CoO: (a) Galvanostatic curves of Cu2O@CoO, Cu2O and CoO upon initial cycles. (b) CV curves of Cu2O@CoO at a rate of 0.5 mV s-1 upon initial cycles. (c) CV curves of Cu2O@CoO at various scanning rates. (d) Comparison of rate cycling performance of Cu2O@CoO, Cu2O, and CoO. (e) Cycling performance of Cu2O@CoO at a fixed rate of 1 C.

Table 1 Electrochemical sodium storage of Cu2O@CoO in comparison with those of recently reported CoO and Cu2O anodes. 1 C is arbitrarily designated as 500 mA g-1.

Anode	Potential range (V)	Rate capability	Capacity retention
CoO microflower [35]	0.01-3	20 mAh g^-1 at 0.6 C	278 mAh g^-1/100 cycles
Co/CoO/N-C [34]	0.01-3	218 mAh g^-1 at 1 C	219 mAh g^-1/100 cycles
Ti-CoO@C [36]	0.01-3	236 mAh g^-1 at 1 C	285 mAh g^-1/100 cycles
CoO-NCNTs [37]	0.01-3	470 mAh g^-1 at 1 C	373 mAh g^-1/300 cycles
CuO@Cu₂O [32]	0.005-3	274 mAh g^-1 at 1 C	415 mAh g^-1/50 cycles
Cu₂O/Cu₂S-RGO [38]	0.01-3	258 mAh g^-1 at 0.6 C	200 mAh g^-1/200 cycles
This work	0.01-3	356 mAh g^-1 at 1 C	306 mAh g^-1/300 cycles

Fig. 5. Mechanism understanding of Cu2O@CoO upon electrochemical Na+ storage by ex situ XRD. (a) Galvanostatic curve. The letters denote the stage where XRD data were collected. (b) XRD patterns.

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Nature-inspired Cu₂O@CoO tree-like architecture for robust storage of sodium

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