Journal
ADVANCED ENERGY MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202302039
Keywords
highly-oriented pyrolytic graphite; manganese oxide; n-EC-STM; noble metal-free electrocatalysts; oxygen evolution reaction; photosystem II
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This study successfully mimics the water oxidation reaction of Photosystem II by developing manganese oxide nanosheets as affordable and abundant electrocatalysts. Detailed investigation reveals that the detected activity at the nanosheet edges is crucial for the enhanced performance of the catalyst.
Photosystem II is nature's solution for driving the oxygen evolution reaction to oxidize water. A manganese-oxide cluster is this protein's active center for water splitting, while the most efficient man-made catalysts are costly noble metal-based oxides. Facing the climate change, research on affordable and abundant electrocatalysts is crucial. To mimic the biological solution, manganese oxide nanosheets are synthesized and deposited on highly-oriented pyrolytic graphite. This electrocatalyst is then examined with spectroscopic and electrochemical measurements, electrochemical noise scanning tunneling microscopy, and density functional theory calculations. The detailed investigation assigns the origin of its enhanced water-splitting performance to detected activity at the nanosheet edges which the proposed mechanism explains further. Therefore, the results provide a blueprint for how to design efficient electrocatalysts for water oxidation with abundant materials.
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