scholarly journals Capacitance of MnO2 Micro-Flowers Decorated CNFs in Alkaline Electrolyte and Its Bi-Functional Electrocatalytic Activity toward Hydrazine Oxidation

2017 ◽  
pp. 2583-2592
Author(s):  
Seong-Min Ji ◽  
Keyword(s):  
Electrocatalytic Activity ◽  
Alkaline Electrolyte ◽  
Hydrazine Oxidation

Conductive bimetal organic framework nanorods decorated with highly dispersed Co3O4 nanoparticles as bi-functional electrocatalyst

2021 ◽  
Author(s):  
Yaxin Duan ◽  
Haitao Liu ◽  
Huabing Zhang ◽  
Shaojie Ke ◽  
Shuaize Wang ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Electronic Conductivity ◽  
Reduction Reaction ◽  
Alkaline Electrolyte ◽  
Co3o4 Nanoparticles ◽  
Cobalt Ions ◽  
Design And Synthesis ◽  
Half Wave ◽  
Highly Dispersed ◽  
Organic Framework

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 Co3O4 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(HITP)2 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(HITP)2 substrate and also by creating the cooperative catalysis sites of Co-Nx and Co3O4 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(HITP)2 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.

Enhanced electrocatalytic activity of gold nanoparticles on hydroxyapatite nanorods for sensitive hydrazine sensors

2016 ◽  
Vol 4 (17) ◽  
pp. 6385-6394 ◽  
Author(s):  
G. Bharath ◽  
Alberto Naldoni ◽  
K. Hasini Ramsait ◽  
Ahmed Abdel-Wahab ◽  
Rajesh Madhu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electrocatalytic Activity ◽  
Au Nanoparticles ◽  
Hydrazine Oxidation ◽  
Catalytic Sites

With the synthesized Au/hydroxyapatite (HAp) nanocomposites, the HAp nanorods favored adsorption of hydrazine, thus bringing hydrazine closer to the catalytic sites of Au nanoparticles and increasing the efficiency of hydrazine oxidation.

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