The association between lithium vacancies and electron holes is critical to the low-temperature electrical properties of cubic Li₇La₃Zr₂O₁₂.

A novel Pb/C interlayer is introduced on Na ₃ Zr ₂ Si ₂ PO ₁₂ solid electrolyte, which offers perfect Na wettability, negates interfacial resistance, and allows in situ fabrication of “Na-less” anodes for stable solid-state Na-metal batteries.

The implementation of low-cost transition-metal complexes in CO₂ reduction reaction (CO₂RR) is hampered by poor mechanistic understanding. Herein, a carbon-supported copper bis-(terpyridine) complex enabling facile kilogram-scale production of the catalyst is developed. We directly observe an intriguing baton-relay-like mechanism of active sites transfer by employing a widely accessible operando Raman/Fourier-transform infrared spectroscopy analysis coupled with density functional theory computations. Our analyses reveal that the first protonation step involves Cu-N bond breakage before the *COOH intermediate forms exclusively at the central N site, followed by an N-to-Cu active site transfer. This unique active site transfer features energetically favorable *CO formation on Cu sites, low-barrier CO desorption and reversible catalyst regeneration, endowing the catalyst with a CO selectively of 99.5 %, 80 h stability, and a turn-over efficiency of 9.4 s⁻¹ at −0.6 V vs. the reversible hydrogen electrode in an H-type cell configuration. We expect that the approach and findings presented here may accelerate future mechanistic studies of next-generation CO₂RR electrocatalysts.