Biswajit Nayak, Smruti Vardhan Purohit, Bishnupad Mohanty, Bibek Dash, Parasmani Rajput, Asim Bhaumik, Bikash Kumar Jena
Nitrogen-rich 3d-transition metal coordination frameworks are promising noble-metal-free ORR electrocatalysts. We report a tetrazole-based Cu-N complex (Cu-ATz) exhibiting efficient four-electron oxygen reduction, excellent durability, and methanol tolerance. The dynamic evolution of copper coordination lowers the *OOH formation barrier, revealing the structure-activity relationship and guiding the rational design of high-performance M-N electrocatalysts.