Zhang En, Fulik Natalia, Hao Guang-Ping, Zhang Han-Yue, Kaneko Katsumi, Borchardt Lars, Brunner Eike, Kaskel Stefan
Inorganic Chemistry I, Technische Universität Dresden, Bergstrasse 66, 01069, Dresden, Germany.
Bioanalytical Chemistry, Technische Universität Dresden, Bergstrasse 66, 01069, Dresden, Germany.
Angew Chem Int Ed Engl. 2019 Sep 9;58(37):13060-13065. doi: 10.1002/anie.201904888. Epub 2019 Aug 5.
A new asymmetric capacitor concept is proposed providing high energy storage capacity for only one charging direction. Size-selective microporous carbons (w<0.9 nm) with narrow pore size distribution are demonstrated to exclusively electrosorb small anions (BF ) but size-exclude larger cations (TBA or TPA ), while the counter electrode, an ordered mesoporous carbon (w>2 nm), gives access to both ions. This architecture exclusively charges in one direction with high rectification ratios (RR=12), representing a novel capacitive analogue of semiconductor-based diodes ("CAPode"). By precise pore size control of microporous carbons (0.6 nm, 0.8 nm and 1.0 nm) combined with an ordered mesoporous counter electrode (CMK-3, 4.8 nm) electrolyte cation sieving and unidirectional charging is demonstrated by analyzing the device charge-discharge response and monitoring individual electrodes of the device via in situ NMR spectroscopy.
提出了一种新的不对称电容器概念，该概念仅在一个充电方向上提供高能量存储容量。具有窄孔径分布的尺寸选择性微孔碳（w<0.9 nm）被证明仅能电吸附小阴离子（BF ），但能排除较大的阳离子（TBA或TPA ），而对电极是有序介孔碳（w>2 nm），两种离子都能进入。这种结构仅在一个方向上以高整流比（RR=12）充电，代表了一种基于半导体二极管的新型电容类似物（“CAPode”）。通过对微孔碳（0.6 nm、0.8 nm和1.0 nm）进行精确的孔径控制，并结合有序介孔对电极（CMK-3，4.8 nm），通过分析器件的充放电响应并通过原位核磁共振光谱监测器件的各个电极，证明了电解质阳离子筛分和单向充电。
