Study On The Preparation And Application Of Anode Catalyst Consisting Of A Ni-Fe Alloy Functionalized By Conducting Polymer

In this paper, we mainly aim at the hydrazine fuel cell anode catalyst study. Firstly, we prepare a novelty composite material as a supporting, choosing two kinds of typical conducting polymers (PANi and PEI) to functionalize MoS2sheets. Then, the nickel-iron alloy is high-efficiency loaded on the support by direct current plating method. The electro-catalyst is successful prepared. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirm the successful functionalization of MoS2with PEI. The empty orbitals of Ni2+and Fe2+(Ni and Fe precursors) coordinated with the donated lone pairs of nitrogen atoms in PEI-mediated MoS2and then the Ni2+and Fe2+were in situ reduced at a negative potential. By changing the mass ratio of nickel and iron composition series experiments, we find the Ni85Fe15is the best combination of loading on the PEI-MoS2sheets, possessing superior electrocatalytic activity for hydrazine electrooxidation. Equally, the Ni90Fe10/PANi-MoS2catalyst presents high activity towards the hydrazine oxidation reaction. Transmission electron microscope images and X-ray diffraction reveal that Ni85Fe15nanoparticles with an average size of2.25run are uniformly dispersed on the PEI-MoS2sheets. The introduction of PEI to MoS2enhanced the interaction between Ni1-xFex alloy and MoS2, so as to improve the stability of the catalyst. More importantly, PEI-functionalized MoS2provided more homogeneous active sites to attach Ni1-xFex NPs. Finally, by electrochemical testing, the Ni85Fe15/PEI-MoS2catalyst for hydrazine oxidation exhibits unexpected, surprisingly pronounced electrocatalytical activity in alkaline solutions, comparable to Ni90Fe10/PANi-MoS2and Ni85Fe15/MoS2catalyst but far exceeding in durability. At the same time, as for the reason of high-performance electrocatalyst Ni85Fe15/PEI-MoS2, we also make an explanation in this paper.By the above experiment, we realize that PEI is a kind of excellent conducting polymer. Thus, we choose PEI decorated GO to be a support, partial GO can be reduced to reduced graphene oxide (rGO) in the presence of amine-containing molecules, which is favourable to enhance the electrical conductivity of supporting materials. Meanwhile, PEI is utilized to uniformly anchor Ni-Fe NPs on PEI-rGO. Transmission electron microscope images reveal that the Ni1-xFex NPs with an average size of8nm are homogeneously dispersed on PEI-rGO10:1sheet. The electrochemical measurements indicate that the Ni1-xFex/PEI-rGO10:1hybrid with a Ni:Fe mass ratio of80:20exhibits the highest electrocatalytic activity toward hydrazine oxidation, while the PEI-rGO10:1supporting material plays an excellent role in the synergistic catalytic effect. Under the same conditions, the electrocatalytic activity of NigoFe2o NPs on PEI-rGO10:1for hydrazine is2times higher than that of the Ni8oFe2o NPs directly deposited on GO. In addition, the i-t measurement and the Tafel behavior of the Ni85Fe15alloy indicates that Ni85Fe15has excellent life and well resistance, preserving in air for a long time. Therefore, we prove that the conducting polymer PEI play an important role in the process of preparation of high performance fuel cell catalysts.