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).

Atomic regulation of metal-organic framework derived carbon-based single-atom catalysts for electrochemical CO2 reduction reaction

2021 ◽  
Author(s):  
Danni Zhou ◽  
Xinyuan Li ◽  
Huishan Shang ◽  
Fengjuan Qin ◽  
Wenxing Chen
Keyword(s):  
Active Sites ◽  
Metal Organic Framework ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
Reduction Reaction ◽  
Single Atom ◽  
Electrochemical Co2 Reduction ◽  
Metal Organic ◽  
Co2 Reduction Reaction ◽  
Organic Framework

Metal-organic framework (MOF) derived single-atom catalysts (SACs), featured unique active sites and adjustable topological structures, exhibit high electrocatalytic performance on carbon dioxide reduction reactions (CO2RR). By modulating elements and atomic...

scholarly journals Photoelectrochemical Reduction of CO2 to Syngas by Reduced Ag Catalysts on Si Photocathodes

2020 ◽  
Vol 10 (10) ◽  
pp. 3487 ◽  
Author(s):  
Changyeon Kim ◽  
Seokhoon Choi ◽  
Min-Ju Choi ◽  
Sol A Lee ◽  
Sang Hyun Ahn ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Onset Potential ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction ◽  
Ag Catalysts

The photoelectrochemical reduction of CO2 to syngas that is used for many practical applications has been emerging as a promising technique to relieve the increase of CO2 in the atmosphere. Si has been considered to be one of the most promising materials for photoelectrodes, but the integration of electrocatalysts is essential for the photoelectrochemical reduction of CO2 using Si. We report an enhancement of catalytic activity for CO2 reduction reaction by Ag catalysts of tuned morphology, active sites, and electronic structure through reducing anodic treatment. Our proposed photocathode structure, a SiO2 patterned p-Si photocathode with these reduced Ag catalysts, that was fabricated using electron-beam deposition and electrodeposition methods, provides a low onset-potential of −0.16 V vs. the reversible hydrogen electrode (RHE), a large saturated photocurrent density of −9 mA/cm2 at −1.23 V vs. RHE, and faradaic efficiency for CO of 47% at −0.6 V vs. RHE. This photocathode can produce syngas in the ratio from 1:1 to 1:3, which is an appropriate proportion for practical application. This work presents a new approach for designing photocathodes with a balanced catalytic activity and light absorption to improve the photoelectrochemical application for not only CO2 reduction reaction, but also water splitting or N2 reduction reaction.

scholarly journals Encapsulating metal organic framework into hollow mesoporous carbon sphere as efficient oxygen bifunctional electrocatalyst

2019 ◽  
Vol 7 (3) ◽  
pp. 609-619 ◽  
Author(s):  
Wanfeng Xiong ◽  
Hongfang Li ◽  
Hanhui You ◽  
Minna Cao ◽  
Rong Cao
Keyword(s):  
Electrical Conductivity ◽  
Hybrid Material ◽  
Mesoporous Carbon ◽  
Metal Organic Framework ◽  
Reduction Reaction ◽  
Carbon Sphere ◽  
Hydrogen Electrode ◽  
Zeolitic Imidazolate Framework ◽  
Bifunctional Electrocatalyst ◽  
Metal Organic

Abstract Applying metal organic frameworks (MOFs) in electrochemical systems is a currently emerging field owing to the rich metal nodes and highly specific surface area of MOFs. However, the problems for MOFs that need to be solved urgently are poor electrical conductivity and low ion transport. Here we present a facile in situ growth method for the rational synthesis of MOFs@hollow mesoporous carbon spheres (HMCS) yolk–shell-structured hybrid material for the first time. The size of the encapsulated Zeolitic Imidazolate Framework-67 (ZIF-67) is well controlled to 100 nm due to the spatial confinement effect of HMCS, and the electrical conductivity of ZIF-67 is also increased significantly. The ZIF@HMCS-25% hybrid material obtained exhibits a highly efficient oxygen reduction reaction activity with 0.823 V (vs. reversible hydrogen electrode) half-wave potential and an even higher kinetic current density (JK = 13.8 mA cm−2) than commercial Pt/C. ZIF@HMCS-25% also displays excellent oxygen evolution reaction performance and the overpotential of ZIF@HMCS-25% at 10 mA cm−2 is 407 mV. In addition, ZIF@HMCS-25% is further employed as an air electrode for a rechargeable Zn–air battery, exhibiting a high power density (120.2 mW cm−2 at 171.4 mA cm−2) and long-term charge/discharge stability (80 h at 5 mA cm−2). This MOFs@HMCS yolk–shell design provides a versatile method for the application of MOFs as electrocatalysts directly.

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.

Enhancing Selectivity through Decrypting the Uncoordinated Zirconium Sites in MOF Electrocatalysts

2021 ◽  
Author(s):  
Xiang-Da Zhang ◽  
Ling-Rui Huang ◽  
Jian-Xiang Wu ◽  
Zhi-Yuan Gu
Keyword(s):  
Metal Organic Framework ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Metal Organic ◽  
Co2 Reduction Reaction ◽  
Organic Framework

Zirconium (Zr)-based porphyrinic metal-organic framework (PCN-223-M) were employed as the electrocatalysts to explore the effect of uncoordinated Zr sites on the performance of CO2 reduction reaction (CO2RR). PCN-223-AA with the...

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.

Metal–organic framework (MOF) composite materials for photocatalytic CO2 reduction under visible light

2021 ◽  
Author(s):  
Zhen Han ◽  
Yaomei Fu ◽  
Yingchao Zhang ◽  
Xiao Zhang ◽  
Xing Meng ◽  
...  
Keyword(s):  
Composite Materials ◽  
Visible Light ◽  
Metal Organic Framework ◽  
Co2 Reduction ◽  
Metal Organic ◽  
Organic Framework

We designed and synthesized TVPT-MOFs, combined with g-C3N4, and the yield of CO2 reduction could reach 56 μmol·g−1·h−1.

scholarly journals Host‐Guest Interactions in Metal‐Organic Framework Isoreticular Series for Molecular Photocatalytic CO2 Reduction

2021 ◽  
Author(s):  
Philip M. Stanley ◽  
Johanna Haimerl ◽  
Christopher Thomas ◽  
Alexander Urstoeger ◽  
Michael Schuster ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Co2 Reduction ◽  
Metal Organic ◽  
Organic Framework

scholarly journals Highly CO Selective Trimetallic Metal-Organic Framework Electrocatalyst for the Electrochemical Reduction of CO2

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 537
Author(s):  
Tran-Van Phuc ◽  
Jin-Suk Chung ◽  
Seung-Hyun Hur
Keyword(s):  
High Current Density ◽  
Metal Organic Framework ◽  
Faradaic Efficiency ◽  
Onset Potential ◽  
Long Term Stability ◽  
Metal Organic ◽  
Reduction Of Co2 ◽  
Electrocatalytic Reduction Of Co2 ◽  
Organic Framework

Pd, Cu, and Zn trimetallic metal-organic framework electrocatalysts (PCZs) based on benzene-1,3,5-tricarboxylic were synthesized using a simple solvothermal synthesis. The as-synthesized PCZ catalysts exhibited as much as 95% faradaic efficiency towards CO, with a high current density, low onset potential, and excellent long-term stability during the electrocatalytic reduction of CO2.

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