Defect-Rich 2D Material Networks for Advanced Oxygen Evolution Catalysts

A versatile and straightforward room-temperature strategy is demonstrated to synthesize boundary defect-rich ultrathin transition metal hydroxide nanosheet networks by in situ etching of a cobalt metal organic framework (Co-MOF, ZIF-L-Co). The resultant defect-rich ultrathin Co(OH)(2) (D-U-Co(OH)(2)) nanoarray is one of the most active monometal-based oxygen evolution catalysts to date. Its activity is 3-4 times higher than that of the commercial RuO2 and superior to that of the reported exfoliated bimetallic catalysts. Co-MOF can also be grown on various substrates, and the chemical composition of the defect-rich 2D materials is tunable by changing the metal ions in the etchants. Owing to these merits of the unique synthesis route, our work provides an opportunity for synthesizing advanced nanomaterials that are difficult to get access to by conventional methods.

一种通用且简便的室温策略被用于通过原位蚀刻钴金属有机框架（Co - MOF，ZIF - L - Co）来合成富含边界缺陷的超薄过渡金属氢氧化物纳米片网络。所得富含缺陷的超薄Co(OH)₂（D - U - Co(OH)₂）纳米阵列是迄今为止最具活性的单金属基析氧催化剂之一。其活性比商业RuO₂高3 - 4倍，且优于已报道的剥离双金属催化剂。Co - MOF还可在各种基底上生长，并且通过改变蚀刻剂中的金属离子，富含缺陷的二维材料的化学成分是可调节的。由于这种独特合成路线的这些优点，我们的工作为合成用常规方法难以获得的先进纳米材料提供了机会。