Abstract
Exploring the relationship between A-site atoms and the ruthenium pyrochlore oxides (A2Ru2O7) structure is crucial for designing efficient electrocatalysts for acidic water oxidation. Here, we manipulate A-site atoms by introducing lanthanide elements (Nd, Sm, Eu, and Ho) in a rational manner. It was shown that different A-site atoms have little effect on the electronic valence of the Ru and O ions, but they do impact the structure of A2Ru2O7. The catalyst activity and stability increased gradually as the A-site ion radius decreased. Ho2Ru2O7 with the lowest Ru content displayed the lowest overpotential (280 mV) at 10 mA/cm2, showing the longest stability (>20,000 s) compared to the other samples. This study suggests that regulating non-active sites can enhance the performance of acidic water splitting.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
