NiO mesoporous nanowalls grown on RGO coated nickel foam as high performance electrodes for supercapacitors and biosensors

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• 作者：Bo Zhao^a ; ^b ; Tao Wang^a ; Li Jiang^a ; Kai Zhang^c ; Matthew M.F. Yuen^c ; Jian-Bin Xu^d ; Xian-Zhu Fu^a ; ^{xz.fu@siat.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Rong Sun^a ; ^{rong.sun@siat.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Ching-Ping Wong^d ; ^e
• 关键词：Nickel oxide mesoporous nanowalls ; RGO coated nickel foam ; Three dimensional ; Supercapacitors ; Glucose sensor
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 February 2016
• 年：2016
• 卷：192
• 期：Complete
• 页码：205-215
• 全文大小：4734 K

文摘

Uniform NiO mesoporous nanowalls are easily fabricated on reduced graphene oxide (RGO) nanosheets coated three dimensional nickel foams (3D NF-G) through a simple aqueous deposition with successive annealing. The structure and morphology of the resulting NiO nanowalls supported on 3D NF-G composites (3D NF-G-NiO) are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). The 3D NF-G-NiO composites are directly used as binder-free electrodes for supercapacitors and biosensors. For supercapacitor, the electrode delivers high specific capacitance of about 950 F g⁻¹ at a current density of 5 A g⁻¹ with excellent cycling stability. As glucose sensor, the 3D NF-G-NiO electrode can detect glucose with an ultrahigh sensitivity of 3.23 mAmM⁻¹ cm⁻² and a superior selectivity with a remarkable lower detection limit towards 10 μM.