The low electrical conductivity of metal organic frameworks (MOFs) is currently the major hurdle for their electrochemical applications. Herein, we render an MOF with a 9-order magnitude higher electrical conductivity by threading a conductive polymer in the MOF cavities at molecular scale. Such electrically conductive MOF–protonated emeraldine polyaniline (PANI) threaded in MIL-101(Cr), PANI∼MIL-101, demonstrates superb electrical conductivity of 0.01 S cm^–1 with the ultrahigh surface area retained (2065 m² g^–1) because of the full penetration of PANI and its uniform distribution within MIL-101 cavities. Effective electron transport is established in the PANI∼MIL-101 structure via π–π stacking among polyaniline chains and n → π* and π–π interactions between polyaniline and MIL-101. We demonstrate PANI∼MIL-101 is an effective electrode in Fe-ion sensors and all-Fe redox flow batteries. One coating of this conductive MOF can serve as alternate for a microelectrode array. This work now opens up a new class of conductive MOFs with high surface area and nanoporosity, which are promising for electrochemical applications.

中文翻译：

---

质子化翡翠聚苯胺螺纹 MIL-101 作为导电高表面积纳米孔电极

金属有机骨架（MOF）的低电导率是目前其电化学应用的主要障碍。在这里，我们通过在分子尺度上将导电聚合物穿入 MOF 腔中，使 MOF 的电导率提高了 9 个数量级。这种在 MIL-101(Cr)、PANI∼MIL-101 中穿入的导电 MOF 质子化翠绿聚苯胺 (PANI) 表现出 0.01 S cm ^{–1 的}出色导电性，并保留了超高表面积 (2065 m ² g ^–1 )由于 PANI 的完全渗透及其在 MIL-101 腔内的均匀分布。有效电子传输是建立在PANI~MIL-101结构通过聚苯胺链之间的 π-π 堆积以及聚苯胺和 MIL-101 之间的 n → π* 和 π-π 相互作用。我们证明了 PANI∼MIL-101 是铁离子传感器和全铁氧化还原液流电池中的有效电极。这种导电 MOF 的一层涂层可以作为微电极阵列的替代品。这项工作现在开辟了一类具有高表面积和纳米孔隙率的新型导电 MOF，有望用于电化学应用。