普鲁士蓝
电催化剂
化学计量学
过氧化氢
镍
化学
选择性
电化学
无机化学
化学工程
材料科学
催化作用
电极
有机化学
物理化学
工程类
作者
Yamin Xi,Yitong Xiang,Chaoqi Zhang,Tong Bao,Yingying Zou,Jin Zou,Guangfeng Wei,Lei Wang,Hongyi Xu,Chengzhong Yu,Chao Liu
标识
DOI:10.1002/ange.202413866
摘要
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 (H2O2) 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 H2O2 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 H2O 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 H2O2 yield of 5.7 mol g‐1 h‐1, superior to the reported MOF‐based electrocatalysts and most other electrocatalysts.
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