“…Moreover, as seen from the Co K ‐edge FT‐EXAFS curves in Figure 5 b, an emerging peak located at around 2.35 Å, assigned to the contributions of Co‐Co/Cu bonds, is clearly observed for CoCu‐MOF NBs after the OER operation, compared with the initial one [26, 40] . Interestingly, both the Co K ‐edge k 2 χ( k ) oscillation and FT‐EXAFS curves of CoCu‐MOF NBs after the OER closely resemble to those of the γ‐CoOOH reference (Figure 5 a,b), indicating the formation of Co‐based oxyhydroxide analogue during the OER [40, 41] . More importantly, the Cu K ‐edge k 2 χ( k ) oscillation and FT‐EXAFS curves of CoCu‐MOF NBs after OER look very similar to that at Co K ‐edge (Figure S22, Supporting Information), which infers resembled structural configurations of Co and Cu sites in CoCu‐MOF NBs after OER.…”