Conductive bimetal organic framework nanorods decorated with highly dispersed Co3O4 nanoparticles as bi-functional electrocatalyst. (12th January 2022)

• Record Type: Journal Article
• Authors: Duan, Yaxin; Liu, Haitao; Zhang, Huabing; Ke, Shaojie; Wang, Shuaize; Dou, Meiling; Wang, Feng
• Is Part Of: Nanotechnology. Volume 33:Number 14(2022)
• Publication Date: 2022-01-12
• Subjects: oxygen reduction reaction -- non-precious metal electrocatalyst -- Ni and Co bimetal organic framework -- high electrical conductivity -- Co3O4 nanoparticles; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac3d66
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 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 π – d conjugated Ni and Co bimetal organic framework (MOF)—NiCo-(2, 3, 6, 7, 10, 11-hexaiminotriphenylene) (NiCo-HITP) nanorods decorated with highly dispersed Co3 O4 nanoparticles (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 -Ni3 HITP2 crystals using cobalt ions. The triggered electrocatalytic activity of the resulting MOF-based materials was achieved by increasing the electrical conductivity (7.23 S cm −1 ) originated from Ni3 HITP2 substrate and also by creating the cooperative catalysis sites of Co–N x and Co3 O4 NPs. 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 Ni3 HITP2 in 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 −2 )—even comparable to a commercial Pt/C-RuO2 -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.