Controllable structure reconstruction of nickel-iron compounds toward highly efficient oxygen evolution.

Nickel-iron (Ni-Fe) compounds have received ever-increasing interest because of their high performance for the oxygen evolution reaction (OER). However, the structure and composition of the active phase of Ni-Fe compounds are not yet understood. Rational design of Ni-Fe compounds with proper composition and exposed active sites is highly desirable to further improve their performance. Here we reported the synthesis of different Ni-Fe compounds by incorporating Fe into the Ni(OH)