Anchoring a cobalt complex onto a doped conductive diamond electrode through azide-alkyne cycloaddition demonstrates another elegant way to employ an organometallic complex-modified electrode with good stability and activity in CO2 reduction. The photochemical grafting method created an sp 3 -sp 3 C-C linkage between the electrode surface and attached the cobalt complex via a "click" reaction (Figure ). The onset of catalytic current was observed at -1.93 V vs. Fc/Fc + and remained unchanged after 1000 cycles. The same immobilization strategy can be applied to other metal complexes. For example, [Fe4N(CO)12] -was immobilized on a glassy carbon electrode via a "click" reaction which exhibited reactivity at -1.2 V vs. SCE for the production of formate in an aqueous solution. The iron complex modified electrode survived three days of testing, showing a significantly improved electrocatalyst stability.