Controllable Modulation of Defects for Layered Double Hydroxide Nanosheets by Altering Intercalation Anions for Efficient Electrooxidation Catalysis

Abstract Hydrazine (N 2 H 4 ) is considered as one of the most potential energy storage materials in liquid fuel cells, as it contains high energy and power density, and the high‐efficiency oxidation of N 2 H 4 in fuel cells has drawn great attention. However, the most used catalysts are expensive noble metal catalysts, thus the development of highly efficient non‐noble metal catalysts is crucial to reduce the cost of hydrazine oxidation in practical industry. Herein, we synthesized a series of CoFe‐layered double hydroxides (CoFe‐LDHs) intercalated with different anions via a simple one‐step co‐precipitation method for the electrooxidation of hydrazine. Through altering the intercalated anions of CoFe‐LDHs, the defects and the electronic structure can be well controlled, and the catalytic performance for the electrooxidation of hydrazine were well promoted by using NO 3 − intercalated into CoFe‐LDH compared with other anions (like Cl − , BO 3 3− , CO 3 2− ). This work developed a series of hydrazine electrooxidation catalysts and established the relationship between the intercalated anions, the fine structure of the catalyst and the electrocatalytic performance.