Hydrangea flower‐like nanostructure of dysprosium‐doped Fe‐MOF for highly efficient oxygen evolution reaction
Yan Ma, Guomei Mu, Yujie Miao, Dunmin Lin, Chenggang Xu, Fengyu Xie, Wen Zeng
Abstract
Developing catalysts with high intrinsic activity toward oxygen evolution reaction (OER) has paramount importance to meet the ever‐increasing quest for sustainability demands for green energy solutions but challenging. Herein, a one‐step synthesized hydrangea flower‐like metal‐organic framework (MOF) by dysprosium (Dy)‐doped Fe‐MOF is reported (Dy 0.05 Fe‐MOF/NF). Impressively, the obtained electrocatalyst possesses optimal OER intrinsic activity, showing a low overpotential of 258 mV at 100 mA·cm −2 , superior to the capability of the noble metal RuO 2 . In addition, an overpotential of 318 mV is needed for Dy 0.05 Fe‐MOF/NF to drive 500 mA·cm −2 . The remarkable performance of Dy 0.05 Fe‐MOF/NF can be explained by the surface‐active electron density modulation of Fe sites, because the doping of Dy with a lower electronegativity than doping of Fe could donate electrons to the neighboring Fe atoms, resulting in profoundly improved OER performance. Beyond that, this work not only offers a perspective to understand the OER mechanism of rare earth doping, but also guides us to design more ideal electrocatalyst and beyond.