Branched nanosheets-interlaced structure of high performance Ni(OH)2 derived from the isostructural Ni3(NO3)2(OH)4 to clarify the role of structure self-supporting in cycling stability
The battery-type electrode materials such as Ni(OH)2 applied in Faraday supercapacitors could present low cycling stability due to the microstructure damage of materials originating from their cyclic volume swelling and shrinking. It is well established that the structural stability of materials is crucial for their cycling stability. However, the lack of knowledge about the structural relevance of materials to the cycling stability somehow results in the chaotic understanding on the materials design. In this work, we try to reveal the structural relevance by comparing the orderly built nanostructure with the randomly packed nanostructure using Ni(OH)2 as target material. It is found that the branched nanosheets-interlaced nanostructure of Ni(OH)2 has the self-supportive function in favor of its structural stability, which thus promotes its cycling stability. Also, the orderly nanostructured Ni(OH)2 presents high electrochemical performance due to the reduced interfacial charge-transfer resistance and Warburg resistance.