Benchmark Electrocatalysis Activity of 3D-Ni-Co-TiO 2 Nanocomposites for Hydrogen Fuel Production Via Alkaline Electroly
- PDF / 1,905,348 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 103 Downloads / 137 Views
JMEPEG https://doi.org/10.1007/s11665-020-05180-3
Benchmark Electrocatalysis Activity of 3D-Ni-Co-TiO2 Nanocomposites for Hydrogen Fuel Production Via Alkaline Electrolytes Mosaad Negem and H. Nady (Submitted January 30, 2020; in revised form July 14, 2020) The invention of sustainable electrocatalysts for electrochemical hydrogen evolution reaction (HER) as inexpensive and efficient contenders is very necessary to energy future of the day life replacing determinate conventional fuel. Ni based electrocatalysts are the most promising non-noble transition metals as an alternative to precious metals. Here, we electroplated new 3D-Ni-Co-TiO2 nanocomposites as the benchmark electrocatalyst for HER in alkaline electrolytes. Electrodeposited Nickel–cobalt-titania nanocomposites of various matrices compositions were obtained via a gluconate plating bath containing colloidal TiO2 particles. The surface morphology, chemical composition and crystal structure of the various 3D-NiCo-TiO2 nanocomposites were characterized by SEM, TEM, EDX, XPS and XRD analysis. Mixing of ultrasonication and mechanical stirring guarantees the homogenous dispersion of TiO2 inside Ni-Co matrices which confirmed by the TEM image. 3D-Ni-Co-TiO2 nanocrystalline composites exposed the electrocatalytic activity greater than the most active metal Pt. Ni-47.6Co-4.01TiO2 nanocrystalline composite attained the highest current density for HER of 900 mA cm22 while Pt showed 630 mA cm22 at 2 2 V potential in 1.0 M KOH. The nanocrystalline Ni-Co-TiO2 composites possess the superior electrocatalytic properties toward the HER in 1.0 M KOH which are remarkably active than the most known electrocatalyst Pt by 1.5 times. The electrocatalytic properties of 3D-Ni-Co-TiO2 composites toward the HER were studied utilizing potentiodynamic polarization and electrochemical impedance spectroscopy methods. Keywords
3D-Ni-Co-TiO2, electroplating, EIS, generation, nanocomposite, ultrasound
hydrogen
1. Introduction Heterogeneous electrocatalysts have great interests because of their mixing metal/metal oxides to produce composites leading to novel properties which can significantly improve the performance by tuning electrochemical reaction routes than different alloys (Ref 1-7). The interfacial interaction among metal/alloys matrices and metal-nonmetal compounds can adjust the electronic distribution, harmonize the adsorption of the intermediate and enhance their stability. The electrochemical conversion of renewable energy is recently the most active research area due to the sustainability, effectiveness and simplicity of fuel generation specifically hydrogen. Hydrogen is considered the future fuel without impact side product like fossil fuel emitted CO2 causing global warming problem. The electrochemical HER on earth-copious transition metals is necessary for the economical design of the renewable energy Mosaad Negem, Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt; and School of Engineering and Advanced Materials, Newcastle University, Newcastle upon
Data Loading...
