Journal
SMALL
Volume 18, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202107268
Keywords
active species; density functional theory; doping engineering; electrocatalysts; oxygen vacancy; surface reconstruction
Categories
Funding
- Natural Science Foundation of China [52172218]
- Open Project Program of Wuhan National Laboratory for Optoelectronics
- Beijing national laboratory for molecular sciences [BNLMS201911]
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Several vacancy-dependent CoZnxMn2-xO4 catalysts were prepared by tailoring the concentration of Zn ions. The superior electrocatalytic performance can be attributed to the formations of active species and oxygen vacancies. These catalysts exhibit comparable performance to noble metal catalysts IrO2 and Pt/C.
It is an effective strategy to develop novel electrocatalysts with controllable defects to enhance their electrocatalytic activity and stability. However, how to precisely design these catalysts on the atom scale remains very difficult. Herein, several vacancy-dependent CoZnxMn2-xO4 catalysts are prepared through tailoring the concentration of Zn ions. The in situ activation of the obtained products accelerates the surface reconstruction. The superior electrocatalytic performance can be ascribed to the formations of MOOH (Mn, Co) active species and abundant oxygen vacancies, which are comparable to noble IrO2 and Pt/C catalysts. Zn-CoMn2O4-1.5 catalyst delivers a cell voltage of 1.63 V and long durability. Density functional theory calculations demonstrate that the appropriate Zn ion doping can improve the density states of p electron on the surface of catalysts significantly and benefit the d-band center closing to Fermi level, suggesting their high charge carrier density and low adsorption energy.
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