Abstract
Splitting of water to produce hydrogen and oxygen is a green and effective method to produce clean energy. Finding an efficient water decomposition catalyst is the key step to realize water decomposition. In this work, by choosing from the literature, six polynuclear manganese (Mn) containing polyoxometalates (Mn-POMs) with different Mn-O clusters and oxidation states of Mn, [MnIIMnIIISiW10O37(OH)(H2O)]6− (Mn2-POM), [MnII3MnIII(H2O)2(PW9O34)2]9− (Mn4-POM), [MnII4MnIII2Ge3W24O94(H2O)2]18− (Mn6-POM-1), [MnIII2MnII4(μ3-O)2(H2O)4(B-β-SiW8O31)(B-β-SiW9O34)(γ-SiW10O36)]18− (Mn6-POM-4), [{MnIII3MnIV4O4(OH)2(OH2)}2(W6O22)(H2W8O32)2(H4W13O46)2]26− (Mn14-POM), [MnII19 (OH)12(SiW10O37)6]34− (Mn19-POM) were prepared. First, the catalytic performance towards the water oxidation of six Mn-POMs was investigated in solution for the first time. Second, six Mn-POMs were fabricated on the surface of ITO electrode using layer-by-layer self-assembly (LBL) to form the composite films, which were characterized by UV-vis spectroscopy and cyclic voltammetry, and then the catalytic water oxidation performance of the composite films was studied and compared with that in solution via a series of controlled experiments, the results indicate that the Mn-POMs with three-dimensional structures, which contain variable valence Mn-O cluster similar to the structure of photocatalytic active center (PSII) exhibit better catalytic performance.
Highlights
In recent years, global warming has led to the continuous deterioration of the human living environment
That the MnAs xPOMs were synthesized according to the literature, infraredInspectra shown in Figure 6, we can observe the main chartheir infrared spectra were measured
Six Mn-containing POMs, with different structures, composition, Mn-O clusters and oxidation state of Mn, were prepared and their electrocatalytic water oxidation performance was investigated under the same experiment conditions in solution and composite film
Summary
Global warming has led to the continuous deterioration of the human living environment. COVID-19 has impacted global trade, exacerbating the impact of the energy crisis on social life. The attention and demand of the international community for clean energy are increasing. Hydrogen energy is recognized as a clean energy source, and its combustion product is water. Hydrogen production by cracking fossil fuels is widely used, which causes secondary emissions of greenhouse gases and a decrease in the quantity of fossil fuels. If water (the largest potential hydrogen energy provider) can be split to produce hydrogen, a green and recyclable clean energy system will be established. There are some problems to be solved, such as high energy consumption and high operation cost. It is very necessary to develop fast, economical and reliable catalysts
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
