FeNi(OH)x Thin Films Prepared by Electrospray Ionization for Electrocatalytic Water Oxidation †

doi:10.7503/cjcu20190525

Abstract

Abstract:

Electrospray ionization technology is an efficient method for the synthesis of high purity thin film materials. Uniform amorphous Fe-Ni bimetallic hydroxide films were prepared on FTO substrate by electrospray ionization deposition. Compared with the films prepared by immersion method, the films prepared by electrospray deposition exhibit higher purity and larger specific surface area. The Fe-Ni bimetallic hydroxide films performs high electrocatalytic water oxidation property, the overpotential at 10 mA/cm ² is 290 mV. Meanwhile, the film shows excellent stability in the catalytic reaction. This study provides a new method for the controllable synthesis of transition metal hydroxide films with high catalytic activity.

Key words: Electrospray ionization, Bimetallic hydroxides, Electrocatalytic water oxidation

CLC Number:

O611.4

TrendMD:

YANG Xiaotian,GENG Zhibin,KUANG Siliang,FENG Shouhua. FeNi(OH)_x Thin Films Prepared by Electrospray Ionization for Electrocatalytic Water Oxidation ^†[J]. Chem. J. Chinese Universities, 2020, 41(1): 56.

Figures/Tables 5

Fig.1 XRD patterns of FeNi(OH)x-soaking(a) and FeNi(OH)x-electrospray(b)(A) and EDS spectrum of as-prepared film(B)

Fig.2 SEM images of film samples (A) FTO substrate; (B) precursor films treated by electrospray deposition of ferric nitrate and nickel nitrate; (C) FeNi(OH)x-soaking; (D) FeNi(OH)x-electrospray.

Fig.3 Fe2p(A) and Ni2p(B) XPS spectra of FeNi(OH)x-soaking(a) and FeNi(OH)x-electrospray(b), O1s XPS spectra of FeNi(OH)x-soaking(C) and FeNi(OH)x-electrospray(D)

Fig.4 OER performance of FeNi(OH)x films (A) LSV curves of FeNi(OH)x-soaking and FeNi(OH)x-electrospray; (B) LSV curves of FeNi(OH)x films with different Fe/Ni ratios; (C) stability test of FeNi(OH)x-electrospray.

Fig.5 Cyclic voltammogram curves of FeNi(OH)x-soaking(A) and FeNi(OH)x-electrospray(B), capacitive current densities of FeNi(OH)x-soaking(C) and FeNi(OH)x-electrospray(D) vs. scan rate

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