Abstract
Recently, it has been great efforts to synthesize an efficient water-oxidizing catalyst. However, to find the true catalyst in the harsh conditions of the water-oxidation reaction is an open area in science. Herein, we showed that corrosion of some simple manganese salts, MnCO3, MnWO4, Mn3(PO4)2 · 3H2O, and Mn(VO3)2 · xH2O, under the water-electrolysis conditions at pH = 6.3, gives an amorphous manganese oxide. This conversion was studied with X-ray absorption spectroscopy (XAS), as well as, scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDXS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), spectroelectrochemistry and electrochemistry methods. When using as a water-oxidizing catalyst, such results are important to display that long-term water oxidation can change the nature of the manganese salts.
Highlights
Electrochemical water splitting to hydrogen and oxygen is a promising way to generate hydrogen fuel[1]
A half-cell consisted of a platinum plate as an electrode in a 1 M KCl solution that was used as a reference half-cell
We studied the conversion of a series of non-oxide Mn-based salts in the electrochemical water oxidation condition, and we observed that all investigated salts were converted to an amorphous manganese oxide phase
Summary
Sima Heidari[1], Jitendra Pal Singh 2, Hadi Feizi[3], Robabeh Bagheri[4], Keun Hwa Chae 2, Zhenlun Song[4], Maasoumeh Khatamian1 & Mohammad Mahdi Najafpour[3,5,6]. We showed that corrosion of some simple manganese salts, MnCO3, MnWO4, Mn3(PO4)2 · 3H2O, and Mn(VO3)2 · xH2O, under the water-electrolysis conditions at pH = 6.3, gives an amorphous manganese oxide. The conversion of manganese complexes to oxide phases and surface amorphization of crystalline calcium manganese oxides or manganese oxides in the chemical or electrochemical water oxidation reaction has been reported[29,30,31]. These converted materials showed exceed catalytic activity[29,30,31]. Reorganization of the material to an active amorphous phase under catalytic condition was responsible for water-oxidizing activity of CoP precatalysts[37]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
