Room‐Temperature Synthesis of Amorphous Fe‐Doped Nickel Phosphate for High‐Efficiency Alkaline Seawater Oxidation
D. Xu, Chenxi Zhang, Yun Liu, Qing Ye, Jinjun Lü, Zhao Yanxia, Jiani Ma, Yongliang Cheng
Abstract
Abstract The construction of an efficient and durable oxygen evolution reaction (OER) electrocatalyst through a simple synthesis strategy is crucial for the hydrogen produced from seawater splitting. However, achieving this goal remains a great challenge. Herein, the synthesis of amorphous Fe‐doped nickel phosphate (Fe‐Ni x PO 4 ) as a high‐performance OER electrocatalysts for alkaline freshwater/seawater splitting is presented using a straightforward co‐precipitation method at room‐temperature. Experimental results reveal the structural reconstruction of Fe‐Ni x PO 4 into Fe‐doped NiOOH decorated with PO 4 3− . The collaborative interplay between Ni 2+ and Fe 3+ , along with the decoration of PO 4 3− , can effectively modulate the electronic environment of the electrocatalyst. Consequently, the optimized Fe‐Ni x PO 4 exhibits exceptional OER activity, requiring overpotentials of 359 and 422 mV to generate 1000 mA cm −2 in alkaline freshwater and alkaline seawater, respectively. Moreover, Fe‐Ni x PO 4 also displays outstanding stability for 100 h at 100 mA cm −2 in alkaline seawater. This research presents a viable approach for fabricating OER electrocatalysts with exceptional efficiency for seawater electrolysis.