期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 9, 页码 9151-9157出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01533
关键词
Mn2O3; alkaline oxygen reduction; EQCM; LICT; RDE; electrocatalysis
资金
- Science and Engineering Research Board (SERB) [CRC/2018/004478]
- Alexander-von-Humboldt Foundation, Germany
Electrochemical transformation of Mn4+ into Mn3+ in the Mn2O3 bixbyite structure is believed to activate this oxygen reduction catalyst for O-2 electrosorption. The actual mechanism, however, still remains to be revealed and elucidated. This earth-abundant Mn-based material, viz., Mn2O3-rod catalyst, was found to have similar activity to Pt/C (20%) in alkaline media. Intrigued by this observation, an in-depth analysis was performed by combining different electrochemical techniques, including the laser-induced current transient technique. Deeper insights into the structure of the electrical double layer and its properties were obtained by probing the electrode surface with a laser beam to record laser-induced current transients to estimate the potential of zero charge. The synthesized Mn2O3 was further found to be an efficient electrocatalyst alternative to Pt/C (20%), an expensive and limited noble-metal catalyst.
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