Banda Harish, Dou Jin-Hu, Chen Tianyang, Zhang Yugang, Dincă Mircea
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
Center for Functional Nanomaterials, Brookhaven National Laboratories, 735 Brookhaven Avenue, Upton, NY, 11973, USA.
Angew Chem Int Ed Engl. 2021 Dec 20;60(52):27119-27125. doi: 10.1002/anie.202112811. Epub 2021 Nov 18.
Intercalation is a promising ion-sorption mechanism for enhancing the energy density of electrochemical capacitors (ECs) because it offers enhanced access to the electrochemical surface area. It requires a rapid transport of ions in and out of a host material, and it must occur without phase transformations. Materials that fulfil these requirements are rare; those that do intercalate almost exclusively cations. Herein, we show that Ni (benzenehexathiol) (Ni BHT), a non-porous two-dimensional (2D) layered coordination polymer (CP), intercalates both cations and anions with a variety of charges. Whereas cation intercalation is pseudocapacitive, anions intercalate in a purely capacitive fashion. The excellent EC performance of Ni BHT provides a general basis for investigating similar dual-ion intercalation mechanisms in the large family of non-porous 2D CPs.
嵌入是一种很有前景的离子吸附机制，可用于提高电化学电容器（EC）的能量密度，因为它能增加对电化学表面积的利用。这需要离子在主体材料中快速进出，并且必须在无相变的情况下发生。满足这些要求的材料很少见；那些能够嵌入的材料几乎只嵌入阳离子。在此，我们表明，镍（苯六硫醇）（Ni BHT），一种无孔二维（2D）层状配位聚合物（CP），能够嵌入各种电荷的阳离子和阴离子。阳离子嵌入是赝电容性的，而阴离子则以纯电容方式嵌入。Ni BHT优异的EC性能为研究无孔二维CP大家族中类似的双离子嵌入机制提供了一个通用基础。
