Perfect Is Perfect: Nickel Prussian Blue Analogue as A High‐Efficiency Electrocatalyst for Hydrogen Peroxide Production
Yamin Xi, Yitong Xiang, Chaoqi Zhang, Tong Bao, Yingying Zou, Jin Zou, Guangfeng Wei, Guangfeng Wei, Lei Wang, Hongyi Xu, Chengzhong Yu, Chengzhong Yu, Chao Liu
Abstract
Abstract Prussian blue analogues (PBA) are a large family of functional materials with diverse applications such as in electrochemical fields. However, their use in the emerging two‐electron oxygen reduction reaction for clean production of hydrogen peroxide (H 2 O 2 ) is lagging. Herein, a general solvent exchange induced reconstruction strategy is demonstrated, through which an abnormal NiNi‐PBA superstructure is synthesized as a high‐performance electrocatalyst for H 2 O 2 generation. The resultant NiNi‐PBA superstructure has a stoichiometric composition with saturated lattice water, and a leaf‐like morphology composed of interconnected small‐size nanosheets with identical orientation and predominate {210} side surface exposure. Our studies show that the Ni−N centers on {210} facets are the active sites, and the saturated lattice H 2 O favors a six‐coordinated environment that results in high selectivity. The “perfect” structure including stoichiometric composition and ideal facet exposure leads to a high selectivity of ~100 % and H 2 O 2 yield of 5.7 mol g −1 h −1 , superior to the reported MOF‐based electrocatalysts and most other electrocatalysts.