State Key Laboratory of Chemical Resource Engineering, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China.
J Colloid Interface Sci. 2019 May 15;544:112-120. doi: 10.1016/j.jcis.2019.02.084. Epub 2019 Feb 26.
Metal-organic frameworks (MOFs) derived materials have been used as promising eletrocatalysts. However, the aggregation and poor conductivity are still obstacles for those eletrocatalysts. Herein, an effective method has been developed to overcome this problem by in-situ growth of ZIF-67 nanocrystals on the PAN fibers (ZIF-67/PAN) followed by the pyrolysis of ZIF-67/PAN fiber in 800 °C (ZIF-67/PAN-800). The obtained nanocomposite fibers showed that the isolated metal particles were anchored and linked up by carbon fibers, leading to elevated conductivity, preventing metal particles migration, and increasing stability. Such network structure provides facile pathways for efficient mass transport and shortens the electronic transmission path. As evidences, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic tests in this study both showed that ZIF-67/PAN-800 had an excellent bifunctional electrocatalytic activity in alkaline electrolyte. This strategy may give on a new way to synthesis electrocatalytic nanocomposite fibers.
金属-有机骨架（MOFs）衍生材料已被用作有前途的电催化剂。然而，聚集和导电性差仍然是这些电催化剂的障碍。本文通过在 PAN 纤维上原位生长 ZIF-67 纳米晶体（ZIF-67/PAN），然后在 800°C 下热解 ZIF-67/PAN 纤维（ZIF-67/PAN-800），开发了一种克服该问题的有效方法。所得纳米复合纤维表明，孤立的金属颗粒被碳纤维锚定和连接，从而提高了导电性，防止了金属颗粒的迁移，并提高了稳定性。这种网络结构为有效传质提供了便捷途径，并缩短了电子传输路径。有证据表明，本研究中的氧还原反应（ORR）和析氧反应（OER）催化测试均表明，ZIF-67/PAN-800 在碱性电解质中具有优异的双功能电催化活性。该策略可能为电催化纳米复合纤维的合成提供一种新途径。
