Abstract
In this article, a novel Co3O4@TiO2 composite is synthesized by applying two-step methods. ZIF-67 is synthesized and used as a template for the synthesis of the composite. The composite is designed by using the effective photocatalytic properties of Co3O4 and TiO2. The resulting synthesized composite is supposed to offer superior properties compared to their counterparts. The synthesized Co3O4@TiO2 composite is characterized by powder X-ray diffraction (PXRD), Brunauer–Emmet–Teller (BET), atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical water splitting, including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) studies on the Co3O4@TiO2 composite, is evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) analysis in a 2M aqueous KOH electrolyte. The current generation stability of these samples is deliberated by chronoamperometric measurements. It is observed, from LSV results at a 1 mV/s scan rate, that metal oxides incorporated on other metal oxides have a higher current density and lower onset potential as compared to pure metal oxides. From the obtained results, it has become evident that synthesized studies on the Co3O4@TiO2 composite possess significant potential for electrochemical water splitting with the lowest onset potential, highest current density, better OER, and HER activity.
Highlights
The whole world is facing serious energy and global warming crises
This means a higher production of carbon dioxide, which is the main contributor to global warming
The Co3O4, TiO2, and Co3O4@TiO2 composites were all tested for hydrogen evolution reaction (HER) activity and the composite demonstrated the lowest onset potential. These and the Co3O4@TiO2 composite demonstrated the lowest onset potential (Figure 3a). These results show that the combination of in a binary composite demonstrated results show that the combination of Co3O4 and TiO2 in a binary composite demonstrated better HER
Summary
The whole world is facing serious energy and global warming crises. Both these issues are inter-related and closely associated with the consumption of fossil fuels. A high consumption of fossil fuels means its resources are in fast decline [1] This means a higher production of carbon dioxide, which is the main contributor to global warming. The use of fossil fuels is a huge burden on the economy of lower-income countries Considering these problems, researchers are working on alternative sources of energy [3]. Metal oxide composites are commonly used as sensors [33], separation science [34], supercapacitors [35], optoelectronic devices [36], and in Li-ion batteries [37] Metal oxides such as Co3 O4 , Fe2 O3 , MnO2 , NiO, and CuO are commonly used in water splitting as well. The Co3 O4 @TiO2 composite shows promising efficiency for electrochemical catalysis for hydrogen production
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