Wang B et al. (2019), Synthesis of Sea Urchin-Like NiCo2O4 via Charge...

ECB-ART-46867

Nanoscale Res Lett 2019 Jan 07;141:6. doi: 10.1186/s11671-018-2819-4.

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Synthesis of Sea Urchin-Like NiCo2O4 via Charge-Driven Self-Assembly Strategy for High-Performance Lithium-Ion Batteries.

Wang B , Tsang CW , Li KH , Tang Y , Mao Y , Lu XY .

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In this study, hydrothermal synthesis of sea urchin-like NiCo2O4 was successfully demonstrated by a versatile charge-driven self-assembly strategy using positively charged poly(diallydimethylammonium chloride) (PDDA) molecules. Physical characterizations implied that sea urchin-like microspheres of ~ 2.5 μm in size were formed by self-assembly of numerous nanoneedles with a typical dimension of ~ 100 nm in diameter. Electrochemical performance study confirmed that sea urchin-like NiCo2O4 exhibited high reversible capacity of 663 mAh g-1 after 100 cycles at current density of 100 mA g-1. Rate capability indicated that average capacities of 1085, 1048, 926, 642, 261, and 86 mAh g-1 could be achieved at 100, 200, 500, 1000, 2000, and 3000 mA g-1, respectively. The excellent electrochemical performances were ascribed to the unique micro/nanostructure of sea urchin-like NiCo2O4, tailored by positively charged PDDA molecules. The proposed strategy has great potentials in the development of binary transition metal oxides with micro/nanostructures for electrochemical energy storage applications.

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Genes referenced: LOC100887844

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References [+] :

Chen, Design and synthesis of hollow NiCo2O4 nanoboxes as anodes for lithium-ion and sodium-ion batteries. 2016, Pubmed

	Fig. 1. a XRD patterns of the as-prepared precursor and NiCo2O4 product before and after heat treatment at 450 °C. b TGA analysis of precursor under oxygen atmosphere with a heating rate of 10 °C min−1
	Fig. 2. a, b Typical FE-SEM images of the sea urchin-like precursor and NiCo2O4 synthesized with 5 g PDDA solution
	Fig. 3. Typical FE-SEM images of the as-prepared precursor synthesized with different amounts of PDDA solution a, b 2.5 g; c, d 10 g
	Fig. 4. a, b TEM images of the sea urchin-like NiCo2O4 synthesized with 5 g PDDA solution
	Fig. 5. a Nitrogen adsorption and desorption isotherms and b pore size distribution of sea urchin-like NiCo2O4 synthesized with 5 g PDDA solution
	Fig. 6. a Survey spectrum of sea urchin-like NiCo2O4. b, c High-resolution XPS spectra of Co2p and Ni2p
	Fig. 7. Cyclic voltammetry (CV) analysis of sea urchin-like NiCo2O4 anodes in the voltage range of 0.005–3.0 V with a scanning rate of 0.01 mV s−1
	Fig. 8. a Cycling performance of NiCo2O4 tested at a current density of 100 mA g−1. b Typical charge-discharge curves of NiCo2O4 tested at 100 mA g−1 for the 1st, 10th, 50th, and 100th cycle c rate capability performance. d Typical charge-discharge curves of NiCo2O4 tested at different current densities ranging from 100 to 3000 mA g−1
	Fig. 9. EIS spectra of sea urchin-like NiCo2O4 anodes after different cycling tests in a coin cell