Preparation and Electro-catalytic Property of Self-supported Nickel Nanowire Array Electrode†

doi:10.7503/cjcu20180405

Abstract

Abstract:

A self-supporting nickel nanowire array(NNA) electrode was prepared by using the low-melting point alloy and porous polycarbonate template, and its catalytic performance toward hydrazine electro-oxidation was studied. SEM, XRD and TEM results show that the NNA electrode consists of a nickel plate and nickel nanowire arrays supported on it. The cotton-like surface of nickel nanowires provides the NNA electrode with the additional specific surface area. Cyclic voltammograms and chronopotential measurements show that when the concentration of hydrazine is 24.6 mmol/L, the onset oxidation potential of the electrode is as low as -0.25 V, and the oxidation current density is as high as 163 mA/cm². When the concentration of hydrazine is relatively low, the hydrazine electro-oxidation reaction and the Ni(OH)₂/NiOOH conversion reaction of the electrode coexist. When the concentration of hydrazine reaches a relatively high level, only hydrazine electro-oxidation occurs. The reaction order of hydrazine species approximately equals to 1, and the reaction activation energy is 16.13—21.24 kJ/mol. The integrated, open structure makes the NNA electrode show significantly better electrocatalytic performance than commercial nickel piece and nickel foam, and exhibit excellent stability.

Key words: Low-melting point alloy, Porous template, Nanowire array, Nickel, Hydrazine electro-oxidation

CLC Number:

O646

TrendMD:

DU Mengmeng,SUN Haijun,GAO Shan,YE Xiaoli,QIAO Lei,GUO Fen. Preparation and Electro-catalytic Property of Self-supported Nickel Nanowire Array Electrode^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2739.

Figures/Tables 7

Fig.1 Preparation process of nickel nanowire array electrode and physical photos of relevant materials

Fig.2 SEM lateral view of Ni plate-template-Ni nanowires composite(A) and SEM vertical view of Ni nanowire arrays at different magnifications(B—D)

Fig.3 TEM(A—C) and high resolution TEM(D) images of Ni nanowiresInset of (C) is the TEM image of Ni nanowire prepared utilizing dichloromethane as the solvent.

Fig.4 XRD patterns of Ni plate(a), template with Ni nanowires imbedding in it(b) and the bare template(c)

Fig.5 CV curves of self-supported Ni nanowire arrays, commercial Ni piece and Ni foam in 1.0 mol/L KOH(A) and 1.0 mol/L KOH + 24.6 mmol/L N2H4(D) solutions(scan rate: 10 mV/s), fast CV scans of Ni nanowire arrays in 1.0 mol/L KOH(B), plots of j derived from the current density at -0.3 V(B) versus scan rate(C), chronopotential curves of nickel nanowire arrays at diffe-rent current densities(E) and results for aging experiments recorded in 1.0 mol/L KOH + 24.6 mmol/L N2H4(F)

Fig.6 CV curves in 1.0 mol/L KOH+x mmol/L N2H4 solutions(x=0, 4.1, 8.2 and 12.3, scan rate: 10 mV/s)(A) and plots of lnjversus lncN2H4 at -0.15, 0.05 and 0.1 V(B)

Fig.7 CV curves at different temperatures in 1.0 mol/L KOH+ 24.6 mmol/L N2H4(scan rate: 10 mV/s)(A) and plots of lnj versus 1/T at -0.1—0.3 V(B)

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