Tian Guofu, Ran Xuan, Wang Qiufan, Zhang Daohong
Key laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central University for Nationalities, Wuhan 430074, China.
Dalton Trans. 2022 Jan 17;51(3):1032-1040. doi: 10.1039/d1dt03346h.
Hollow/porous nanomaterials are widely applicable in various fields. The last few years have witnessed increasing interest in the nanoscale Kirkendall effect as a versatile route to fabricate hollow/porous nanostructures. The transformation of Cu-Co Prussian blue analogue (CuCo-PBA) and FeFe-PBA nanocubes into CuO/CoO and FeO nanoframes is based on two types of nanoscale Kirkendall effect, which are related to solid-solid interfacial oxidation and solid-gas interfacial reaction, respectively. Both CuO/CoO and FeO nanoframe electrodes exhibit high reversible discharge capacity, good rate performance and long cycling stability. Moreover, an asymmetric supercapacitor (ASC) is assembled by using CuO/CoO as a cathode and FeO as an anode, respectively. The ASC can be operated in a wide potential range of 1.4 V with a large specific capacity of 181.8 F g, a high energy density of 48.77 W h kg (at 751.2 W kg), an outstanding power density of 3657.8 W kg (at 32.9 W h kg) and a good capacity retention (73.68%) after 6000 galvanostatic charge-discharge cycles, together with excellent flexibility. The ASC in series can power a LED and work stably under water conditions, delivering excellent practicability.
中空/多孔纳米材料在各个领域都有广泛的应用。在过去几年中，人们对纳米级柯肯达尔效应作为制备中空/多孔纳米结构的通用途径越来越感兴趣。将铜钴普鲁士蓝类似物（CuCo-PBA）和铁铁普鲁士蓝类似物（FeFe-PBA）纳米立方体转变为CuO/CoO和FeO纳米框架是基于两种类型的纳米级柯肯达尔效应，它们分别与固-固界面氧化和固-气界面反应有关。CuO/CoO和FeO纳米框架电极都表现出高可逆放电容量、良好的倍率性能和长循环稳定性。此外，通过分别使用CuO/CoO作为阴极和FeO作为阳极组装了一种不对称超级电容器（ASC）。该ASC可以在1.4 V的宽电位范围内工作，具有181.8 F g的大比容量、48.77 W h kg的高能量密度（在751.2 W kg时）、3657.8 W kg的出色功率密度（在32.9 W h kg时）以及在6000次恒流充放电循环后良好的容量保持率（73.68%），同时具有出色的柔韧性。串联的ASC可以为一个发光二极管供电，并在水下条件下稳定工作，具有出色的实用性。
