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Micropore-facilitated surface-dominated pseudocapacitive storage in MOF-derived hollow nano-cuboids enabled by in-situ Zn-sacrificed strategy
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2023-06-01 , DOI: 10.1016/j.cej.2023.143852
Gengyi Wang , Aimei Gao , Tingting Zhao , Tao Meng , Fenyun Yi , Cong Liu , Jingzhou Ling , Chun He , Dong Shu

Herein, we report a novel metal–organic frameworks (MOF)-derived nanomaterial, this is hollow nano-cuboids composed of NiCoP particles and nanocarbon, which is enriched in appropriate micropores induced by in-situ Zn-sacrificed strategy (NiCoP@C(Zn)). Such abundant micropores (∼0.5 nm, larger than the radius of OH) can supply more ion shuttle channels at multi-directions, greatly-reducing the longitudinal migration time in the hollow structure, resulting in a rather high ion diffusion coefficient (∼10−8 cm2 s−1). This combined with hollow topology show the marked electrolyte-accessibility recognized by experimental and density functional theory (DFT) results, which can adequately-expose the electrochemically active sites, thus birthing a surface-dominated pseudocapacitive behaviors towards high-rate response and high-capacity storage. Due to the robust structural merits and pore character as well as their synergy, the NiCoP@C(Zn) electrode can realize a rather stable cyclability (over 10,000 cycles). Further, we construct the pouch-type supercapacitor based on NiCoP@C(Zn) cathode, which delivers a relatively-good energy output (35.2 Wh kg−1), superior to those of some previously-reported asymmetric supercapacitors. Remarkably, such pouch device can exhibit the triple-high properties, including high mechanical reliability, high safety and high availability in real-word application. This work successfully-discloses the influence of well-matched micropores on pseudocapacitive charge storage, and opens new horizons of developing a high-performance electrode nanomaterial.



中文翻译:

通过原位锌牺牲策略实现 MOF 衍生的空心纳米长方体中微孔促进的表面主导赝电容存储

在此,我们报道了一种新型金属有机框架(MOF)衍生的纳米材料,这是由 NiCoP 颗粒和纳米碳组成的中空纳米长方体,其富含原位锌牺牲策略诱导的适当微孔(NiCoP@C(锌))。如此丰富的微孔(~0.5 nm,大于OH -的半径)可以在多方向提供更多的离子穿梭通道,大大减少中空结构中的纵向迁移时间,从而导致相当高的离子扩散系数(~10 −8厘米2−1). 这与空心拓扑结构相结合,显示出实验和密度泛函理论 (DFT) 结果所认可的显着电解质可及性,可以充分暴露电化学活性位点,从而产生表面主导的赝电容行为,实现高速率响应和高容量贮存。由于稳健的结构优点和孔隙特性以及它们的协同作用,NiCoP@C(Zn) 电极可以实现相当稳定的循环性能(超过 10,000 次循环)。此外,我们构建了基于 NiCoP@C(Zn) 正极的袋型超级电容器,它提供了相对较好的能量输出(35.2 Wh kg -1),优于之前报道的一些非对称超级电容器。值得注意的是,这种袋装设备可以在实际应用中展现出三重特性,包括高机械可靠性、高安全性和高可用性。这项工作成功地揭示了良好匹配的微孔对赝电容电荷存储的影响,并为开发高性能电极纳米材料开辟了新视野。

更新日期:2023-06-06
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