Fabrication of Nano-porous Co by Dealloying for Supercapacitor and Azo-dye Degradation

doi:10.11901/1005.3093.2020.443

Chinese Journal of Materials Research

2020, Vol. 34

Issue (12): 905-914 DOI: 10.11901/1005.3093.2020.443

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Fabrication of Nano-porous Co by Dealloying for Supercapacitor and Azo-dye Degradation

CHEN Feng, ZHOU Yang, CHEN Yannan, LIN Zongling, QIN Fengxiang(

)

School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

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CHEN Feng, ZHOU Yang, CHEN Yannan, LIN Zongling, QIN Fengxiang. Fabrication of Nano-porous Co by Dealloying for Supercapacitor and Azo-dye Degradation. Chinese Journal of Materials Research, 2020, 34(12): 905-914.

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Abstract

Nano-porous Co was prepared by electrochemically dealloying of Zr₅₆Al₁₆Co₂₈ amorphous alloy in 0.5%(mass fraction) NH₄F and 1 mol/L (NH₄)₂SO₄ mixed solution. Nano-porous Co has the bicontinuous porous structure with large specific surface area and fast charge transfer ability. The prepared nano-porous Co exhibits good performance in many aspects: firstly, it delivers a high specific capacitance of 318 F/g at 2 A/g, suggesting its good performance as supercapacitor electrode; secondly, it exhibits degradation efficiencies under square wave potential as high as 96% for Direct Blue 6 and Acid Orange II respectively. The degradation ability of nano-porous Co electrode per unit mass is 3.5 times higher than that of Zr₅₆Al₁₆Co₂₈ amorphous alloy electrode.

Key words: metallic materials nanoporous Co dealloying supercapacitor degradation

Received: 23 October 2020

ZTFLH:

TG430.40

Fund: National Natural Science Foundation of China(51671106);Natural Science Foundation of Jiangsu Province(BK20171424)

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	Feng CHEN
	Yang ZHOU
	Yannan CHEN
	Zongling LIN
	Fengxiang QIN

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.443 OR https://www.cjmr.org/EN/Y2020/V34/I12/905

Fig.1 XRD pattern (a) andpolarization curve of Zr₅₆Al₁₆Co₂₈ amorphous alloy in 0.5% NH₄F+1 mol/L (NH₄)₂SO₄ solution (b)

Fig.2 SEM image of the Zr₅₆Al₁₆Co₂₈ amorphous alloy after dealloying. Inset: pore size distribution diagram (a) and corresponding EDS spectra (b)

Fig.3 TEM image (a) and SAED (b) of nanoporous Co

Fig.4 XPS spectra ofZr 3d (a), Al 2p(b), Co 2p (c) and O 1s (d) for nanoporous Co

Fig.5 CV curves of nanoporous Co at different scan rate (a), GCD curves of nanoporous in different current density (b), Corresponding specific capacitance in different current density (c) and Nyquist plots of EIS (d). Inset: magnified high frequency regions of Nyquist plots

Fig.6 UV-Vis spectra of DB6 (a) and AOII (b) solutions after degradation by nanoporous Co at different square wave potential, corresponding degradation efficiency (c)

Fig.7 UV-Vis spectra of DB6 (a) and AOII (b) solutions after degradation by nanoporous Co by different cycles, corresponding degradation efficiency (c)

Fig.8 Square wave potential diagrams ofnanoporous Co (a, b) andZr₅₆Al₁₆Co₂₈ amorphous alloy (c, d) in DB6 and AOII solution; Fading effect diagrams of DB6 (e) and AOII (f): (i) original solution; (ii) solution degraded by nanoporous Co; (iii) solution degraded by Zr₅₆Al₁₆Co₂₈ amorphous alloy

Fig.9 UV-Vis spectra of DB6 (a) and AOII solutions (b) after degradation by nanoporous Co and Zr₅₆Al₁₆Co₂₈ amorphous alloy

Fig.10 XPS spectra of degradation products in (i) DB6 and (ii) AOII solutions (a) Zr 3d, (b) Al 2p, (c) Co 2p, (d) Na 1s, (e) S 2p and (f) O 1s spectrum

Table 1 The degradation efficiency (η) and degradation factor (D_f) of nanoporous Co and Zr₅₆Al₁₆Co₂₈ amorphous alloy electrodes for DB6 and AOII solutions

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