Zr-MOF@Polyaniline as an efficient platform for nickel deposition: Application to methanol electro-oxidation

In this work, a new electrocatalyst is introduced for methanol oxidation reaction (MOR) in alkaline solutions. Polyaniline (PANI) was formed around synthesized UiO-66-NH2 (Zr-MOF). The prepared composite (Zr-MOF@PANI) was used as a substrate for nickel deposition. After drop-casting of Zr-MOF@PANI/N...

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Bibliographic Details
Published in:Fuel (Guildford) 2021-07, Vol.296, p.120677, Article 120677
Main Authors: Sheikhi, Sara, Jalali, Fahimeh
Format: Article
Language:English
Subjects:
Catalysts
Chemical reduction
Core-shell structure
Direct methanol fuel cells
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Fuel cells
Fuel technology
Glassy carbon
Metal organic framework
Metal-organic frameworks
Methanol
Methanol electro-oxidation
Nanocomposites
Nanoparticles
Nickel
Oxidation
Platinum
Polyaniline
Polyanilines
Sodium hydroxide
Spectroscopy
X-ray diffraction
Zirconium
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Summary:In this work, a new electrocatalyst is introduced for methanol oxidation reaction (MOR) in alkaline solutions. Polyaniline (PANI) was formed around synthesized UiO-66-NH2 (Zr-MOF). The prepared composite (Zr-MOF@PANI) was used as a substrate for nickel deposition. After drop-casting of Zr-MOF@PANI/Ni-NPs on a glassy carbon electrode (GCE), it was used in MOR. The results of different electrochemical methods confirmed the efficiency of the proposed electrocatalyst. [Display omitted] •Polyaniline was used in a core–shell structure with Zr-MOF (Zr-MOF@PANI).•Ni nanoparticles were deposited on Zr-MOF@PANI by a chemical reduction method.•The prepared composite had excellent catalytic properties towards methanol oxidation.•Zr-MOF@PANI/Ni showed high poisoning-resistance and excellent current densities.•Zr-MOF@PANI/Ni is a promising alternative to Pt-based anodic catalysts in DMFCs. Polyaniline (PANI) was formed around a Zr-metal–organic framework (Zr-MOF) to improve its conductivity and electrochemical properties. Then, nickel nanoparticles was deposited by using a chemical reduction method to form Zr-MOF@PANI/Ni-NPs. The prepared nanocomposite was studied by different methods, such as, scanning and transmission electron microscopies (SEM and TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopies (EDX) and FT-IR. A core–shell structure was distinguished for Zr-MOF@PANI, which was decorated by Ni nanoparticles. The nanocomposite was drop cast on glassy carbon electrode (GCE). Highly improved electrochemistry of Ni was observed on Zr-MOF@PANI-Ni-NPs/GCE by cyclic voltammetry and electrochemical impedance spectroscopy. Then, electrocatalytic behavior of the modified electrode towards methanol oxidation reaction in alkaline solution (1.0 M NaOH) was studied. In comparison with stepwise-modified electodes, the oxidation current of methanol was highly increased on Zr-MOF@PANI-Ni-NPs/GCE, and exhibited stability after 200 potential cycles between 0.0 and +0.8 V (87% of the initial current maintained). Chronoamperometry showed the highest current density for Zr-MOF@PANI/Ni-NPs/GCE (110 mA cm−2) compared to stepwise modified electrodes. The excellent electrochemical performance toward oxidation of methanol (291.8 mAcm−2) was attributed to the good synergy between Zr-MOF, PANI, and Ni nanoparticles. The results of the present study shows that the nanocomposite may be considered as an alternative to Pt and Pt-based catalysts for alkaline direct methanol f
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.120677