A study of the discharge process of manganese oxide in borate solution using in situ techniques

✍ Scribed by B.A. Lopez De Mishima; Toshiaki Ohtsuka; Norio Sato

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 686 KB
• Volume: 38
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(93)85149-s

✦ Synopsis

The change of electrodeposited manganese oxide on gold during the reduction process was investigated in borate solution at pH 9.2, using in situ optical techniques. Raman spectroscopy (RS) showed five bands of manganese dioxide at 414 480,520,580 and 64Ocm-I, which decreased and disappeared during the cathodic discharge process. These changes occurred reversibly during the reductionoxidation cycle. The band at 58Ocm-' can be assigned to the Mn-0 stretching because of the correlation found between the XPS analyses and the Raman spectroscopy. In situ Raman spectra of thermal manganese oxide were also performed, and showed the same five Raman bands at 415,485,515, 585 and 635cm-'. Electrochemically modulated infrared spectroscopy (EMIRS) is associated with the appearance of a O-H stretching band. The changes of RS, EMIRS and XPS reveal the proton+lectron injection for the reduction reaction of electrolytic MnO, .