Duan Yaxin, Liu Haitao, Zhang Huabing, Ke Shaojie, Wang Shuaize, Dou Meiling, Wang Feng
State Key Laboratory of Chemical Resource Engineering, Laboratory of Electrochemical Process and Technology for materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.
School of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, People's Republic of China.
Nanotechnology. 2022 Jan 12;33(14). doi: 10.1088/1361-6528/ac3d66.
The poor electronic conductivity and low intrinsic electrocatalytic activity of metal organic frameworks (MOFs) greatly limit their direct application in electrocatalytic reactions. Herein, we report a conductive two-dimensional-conjugated Ni and Co bimetal organic framework (MOF)-NiCo-(2,3,6,7,10,11-hexaiminotriphenylene) (NiCo-HITP) nanorods decorated with highly dispersed CoOnanoparticles (NPs) as a promising bi-functional electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) through an effective and facile strategy by modifying the rod-shaped -NiHITPcrystals using cobalt ions. The triggered electrocatalytic activity of the resulting MOF-based materials was achieved by increasing the electrical conductivity (7.23 S cm) originated from NiHITPsubstrate and also by creating the cooperative catalysis sites of Co-Nand CoONPs. Optimized syntheses show a promising ORR activity with a high half-wave potential (0.77 V) and also a significantly improved OER activity compared with pure NiHITPin alkaline electrolyte. Furthermore, a rechargeable Zn-air battery using the as-prepared material as air-cathode also shows a high power density (143.1 mW cm)-even comparable to a commercial Pt/C-RuO-based battery. This methodology offers a new prospect in the design and synthesis of non-carbonized MOF bi-functional electrocatalysts for efficient catalysis towards ORR and OER.
金属有机框架材料（MOFs）较差的电子导电性和较低的本征电催化活性极大地限制了它们在电催化反应中的直接应用。在此，我们报道了一种导电的二维共轭镍钴双金属有机框架（MOF）——镍钴-（2,3,6,7,10,11-六亚氨基三亚苯）（NiCo-HITP）纳米棒，其表面装饰有高度分散的氧化钴纳米颗粒（NPs），通过一种有效且简便的策略，即利用钴离子修饰棒状的-NiHITP晶体，使其成为一种有前景的双功能电催化剂，用于氧还原反应（ORR）和析氧反应（OER）。通过提高源自NiHITP基底的电导率（7.23 S cm）以及创建Co-N和CoO NPs的协同催化位点，实现了所得基于MOF的材料的触发电催化活性。优化合成显示，在碱性电解质中，该材料具有较高的半波电位（0.77 V），展现出良好的ORR活性，并且与纯NiHITP相比，OER活性也有显著提高。此外，使用所制备材料作为空气阴极的可充电锌空气电池也显示出高功率密度（143.1 mW cm）——甚至可与基于商业Pt/C-RuO的电池相媲美。这种方法为设计和合成用于高效催化ORR和OER的非碳化MOF双功能电催化剂提供了新的前景。
