TY - JOUR
T1 - Unraveling amazing structural features of a highly efficient “oxo-Co/phosphate” catalyst for water oxidation
AU - Hernández-Contreras, Xochitl Andrea
AU - Zumeta-Dubé, Inti
AU - Rodríguez Gattorno, Geonel
AU - Cayetano Castro, Nicolás
AU - Casas Espínola, José Luis
AU - Reguera, Edilso
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3
Y1 - 2021/3
N2 - The oxo-Co/phosphate based material (CoPi) developed by Kanan and Nocera in 2008 is among the most outstanding catalysts for water oxidation at neutral pH. The remarkable performance and striking properties of CoPi reside on its intriguing and unique structure. In the present contribution, TEM, SAED, UV-vis-NIR absorption and Raman spectroscopy were performed at 77 K, complemented by room temperature experiments, to unprecedentedly reveal that CoPi is composed by short-range ordered β-NaCoPO4 (a solid ionic conductor) and expanded-lattice Co3O4 clusters with electronic structures, vibrational responses and catalytic properties quite deviated from those of their bulk counterparts. Internal morphological features of CoPi are also disclosed. Consequently, some aspects of the previously proposed structure and operating mechanisms are revised. This study derived in a deposition route which yields CoPi layers that outperforms, as water oxidation catalyst, the traditionally electrodeposited CoPi.
AB - The oxo-Co/phosphate based material (CoPi) developed by Kanan and Nocera in 2008 is among the most outstanding catalysts for water oxidation at neutral pH. The remarkable performance and striking properties of CoPi reside on its intriguing and unique structure. In the present contribution, TEM, SAED, UV-vis-NIR absorption and Raman spectroscopy were performed at 77 K, complemented by room temperature experiments, to unprecedentedly reveal that CoPi is composed by short-range ordered β-NaCoPO4 (a solid ionic conductor) and expanded-lattice Co3O4 clusters with electronic structures, vibrational responses and catalytic properties quite deviated from those of their bulk counterparts. Internal morphological features of CoPi are also disclosed. Consequently, some aspects of the previously proposed structure and operating mechanisms are revised. This study derived in a deposition route which yields CoPi layers that outperforms, as water oxidation catalyst, the traditionally electrodeposited CoPi.
KW - TEM-SAED analysis
KW - Water oxidation catalyst
KW - catalyst
KW - nanostructured catalyst
KW - oxo-Cobalt/phosphate (CoPi)
KW - water splitting
UR - http://www.scopus.com/inward/record.url?scp=85091763949&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2020.119549
DO - 10.1016/j.apcatb.2020.119549
M3 - Artículo
AN - SCOPUS:85091763949
SN - 0926-3373
VL - 282
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 119549
ER -
