Minghong Fan,Zhiyu Gong,Jiayu Zheng,Lu Zhou,Beibei Qi,Tianzuo Liu,Zhengfei Yang
Unique nanostructures of bimetallic materials derived from zeolitic imidazolate frameworks (ZIFs) are promising candidates for electrochemical sensor applications. In this study, different bimetallic bar-shaped ZIFs (B-ZIFs) were synthesized by replacing some cobalt ions with different metals ions (Ni 2+ , Ce 2+ , Cu 2+ , Mn 2+ , or Fe 3+ ). Then their derivatives were prepared via carbonization, respectively. Upon conducting thorough material characterizations and assessment of the electrochemical properties, the most suitable candidate for electrode modification was identified as bar-shaped Co/Cu-based carbon materials (B-Co/Cu/Cs). This choice facilitated the construction of an innovative electrochemical sensor tailored for the determination of H 2 O 2 . The furnished B-Co/Cu/Cs-based sensor showed good linearity for H 2 O 2 analysis within concentrations ranged from 0.5-4000 μM and 4000–11000 μM, with a detection limit of 0.44 μM. All these results suggested that the prepared material would be a competitive candidate for the non-enzymatic H 2 O 2 sensing.
Jiaming Shen,Yang Li,Chaohai Wang,Rui Luo,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang
Desalination performance of capacitive deionization (CDI), a promising deionization technology, depends significantly upon the compositions and internal structures of electrode materials . Herein, hollow ZIFs-derived nanoporous carbons (HZCs) were prepared via chemical etching method and subsequent pyrolysis . Particularly, the tannic acid as an etching agent was employed to tailor hollow structure. The resultant HZCs possess high surface area, wide pore size distribution , obvious hollow cavity and high nitrogen content. Moreover, HZCs electrodes exhibited a significantly improved CDI performance over the solid ZIFs-derived nanoporous carbons (SZCs) electrodes. The improved electrosorption rate and capacity (15.31 mg g -1 at 1.2 V) of HZCs electrode imply that hollow structure facilitates the transportation for both ions and mass on CDI process. Besides, the further cycle experiment exhibits a great regeneration stability of HZCs electrode over 20 adsorption-desorption cycles. All these results indicate that HZCs should be a promising candidate for CDI application.
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