A cobalt metal–organic framework (Co-MOF): a bi-functional electro active material for the oxygen evolution and reduction reaction

2019 ◽  
Vol 48 (28) ◽  
pp. 10557-10564 ◽  
Author(s):  
Rajat K. Tripathy ◽  
Aneeya K. Samantara ◽  
J. N. Behera
Keyword(s):  
Oxygen Evolution ◽  
Current Density ◽  
Metal Organic Framework ◽  
Active Material ◽  
Reduction Reaction ◽  
Cobalt Metal ◽  
Onset Potential ◽  
Metal Organic ◽  
Electron Reduction ◽  
State Of Art

Co-MOF catalyzes the ORR efficiently with a lower onset potential (0.85 V vs. RHE) by a four electron reduction path with better durability. It needs only 280 mV overpotential to deliver the state-of-art current density of 10 mA cm−2.

ZIF-67 Derived Cu-Doped Electrocatalyst for Oxygen Reduction Reaction

2020 ◽  
Vol 18 (2) ◽  
Author(s):  
M. Daarain Haider ◽  
Naseem Iqbal ◽  
Syed Aun M. Rizvi ◽  
Tayyaba Noor ◽  
Saadia Hanif ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Metal Organic Framework ◽  
Reduction Reaction ◽  
Electrode System ◽  
Alkaline Media ◽  
Hydrogen Electrode ◽  
Onset Potential

Abstract In the present study, the catalytic activity of copper-loaded cobalt-based metal–organic framework (ZIF-67) composites was studied for their electrochemical oxygen reduction reaction (ORR). The Cu-ZIF-67 composite was prepared by the solvothermal method. After pyrolysis under argon atmosphere at 700 °C, the composite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). The electrochemical activity of the composites was tested for ORR in 0.1 M alkaline media using the three-electrode system by cyclic voltammetry (CV), Tafel plots, and electrochemical impedance spectroscopy (EIS). The composites showed variable activity with a current density of 1.32 mA cm−2 at 0.71 V (versus reversible hydrogen electrode (RHE)) onset potential for 70 wt% Cu-ZIF-67, 7.5 mA cm−2 at 0.82 V (versus RHE) onset potential for 50 wt% Cu-ZIF-67, and 11.85 mA cm−2 at 0.85 V (versus RHE) for 30% Cu-ZIF-67. The increasing ratio of the ZIF-67 effect can be attributed to the increased activity of ZIF-67 with the synergistic effect of Cu toward increased current density.

scholarly journals Cobalt Metal–Organic Framework Based on Two Dinuclear Secondary Building Units for Electrocatalytic Oxygen Evolution

2019 ◽  
Vol 11 (50) ◽  
pp. 46658-46665 ◽  
Author(s):  
Silvia Gutiérrez-Tarriño ◽  
José Luis Olloqui-Sariego ◽  
Juan José Calvente ◽  
Miguel Palomino ◽  
Guillermo Mínguez Espallargas ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Metal Organic Framework ◽  
Cobalt Metal ◽  
Secondary Building Units ◽  
Metal Organic ◽  
Organic Framework

Cu3P/C Nanocomposites for Efficient Electrocatalytic CO2 Reduction and Zn–CO2 Battery

2019 ◽  
Vol 19 (6) ◽  
pp. 3232-3236 ◽  
Author(s):  
Mingyue Peng ◽  
Suqin Ci ◽  
Ping Shao ◽  
Pingwei Cai ◽  
Zhenhai Wen
Keyword(s):  
Metal Organic Framework ◽  
Electrochemical Characterizations ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Open Circuit ◽  
Hydrogen Electrode ◽  
Onset Potential ◽  
Electrochemical Conversion ◽  
Metal Organic ◽  
Global Carbon

Exploiting effective electrocatalysts toward electrochemical conversion of CO2 into valued-added chemicals is highly desirable for achieving the global carbon cycle. In this work, we report the synthesis of Cu3P/C nanocomposites by phosphatizing the copper-based metal organic framework precursor. Systematic electrochemical characterizations demonstrate the Cu3P/C nanocomposites hold high activity and favorable selectivity towards CO2 reduction reaction (CO2RR) into CO, as manifested by an onset potential is about −0.25 V versus reversible hydrogen electrode (RHE) and a faradic efficiency (FE) of 47% for CO production at a relatively low potential (−0.3 V). The attractive catalytic properties might be attributed to the synergistic effect of cooper and phosphorus elements, as well as the unique structure of Cu3P. Furthermore, we propose an asymmetrical-electrolyte Zn–CO2 battery with the Cu3P/C as cathode catalyst, demonstrating a decent performance with an open-circuit voltage of 1.5 V and a power density of 2.6 mW cm−2 (at 10 mA cm−2).

Stable Iron Hydroxide Nanosheets@Cobalt‐Metal–Organic–Framework Heterostructure for Efficient Electrocatalytic Oxygen Evolution

ChemSusChem ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 4623-4628 ◽  
Author(s):  
Zhi Gao ◽  
Zhi Wu Yu ◽  
Feng Qing Liu ◽  
Chuo Yang ◽  
Ya Hong Yuan ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Metal Organic Framework ◽  
Iron Hydroxide ◽  
Cobalt Metal ◽  
Metal Organic ◽  
Organic Framework
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