An FexNi4−xPy/N, P co-doped carbon nanotube composite as a bifunctional electrocatalyst for oxygen and hydrogen electrode reactions

2021 ◽  
Author(s):  
Tao Wei ◽  
Xiaoli Jiang ◽  
Qing Qin ◽  
Xien Liu
Keyword(s):  
Electrical Conductivity ◽  
Active Sites ◽  
Catalytic Performance ◽  
High Electrical Conductivity ◽  
Hydrogen Electrode ◽  
Bifunctional Electrocatalyst ◽  
Anchoring Effect ◽  
Electrode Reactions ◽  
Carbon Nanotube Composite ◽  
Co Doped

The FexNi4−xPy/N, P-CNT complex exhibits excellent bifunctional catalytic performance towards HER and OER due to the synergy of high electrical conductivity, multicomponent active sites, and anchoring effect of carbon nanotubes.

scholarly journals Vertical Bi2Se3 flake array as a Pt-free counter electrode for dye-sensitized solar cells

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 51958-51964 ◽  
Author(s):  
Manshu Han ◽  
Shuang Lu ◽  
Jiangang Ma ◽  
Haiyang Xu ◽  
Yinglin Wang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Solar Cells ◽  
Active Sites ◽  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
High Electrical Conductivity ◽  
Dye Sensitized ◽  
Catalytic Active Sites ◽  
Sensitized Solar Cells

Vertical Bi2Se3 flake arrays work as counter-electrode in DSSCs due to its high electrical conductivity and abundance of catalytic active sites.

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.

Synthesis of Cytochrome-like Copper/Sulfur/Graphite Hybrid as a Cathode Catalyst for Oxygen Reduction with High Selective Four-electron Pathway in Alkaline Medium

2020 ◽  
Vol 42 (4) ◽  
pp. 612-612
Author(s):  
Zhaleh Ashtari Zhaleh Ashtari ◽  
Behnam Seyyedi Behnam Seyyedi ◽  
Baharak Sehatnia Baharak Sehatnia
Keyword(s):  
Oxygen Reduction ◽  
Alkaline Medium ◽  
Active Sites ◽  
Copper Phthalocyanine ◽  
Linear Sweep Voltammetry ◽  
Rotating Disk ◽  
Catalytic Performance ◽  
Rotating Disk Electrode ◽  
Hydrogen Electrode ◽  
Wide Range

The cytochrome-like Copper/Sulfur/Graphite electrocatalyst (Cu-S-G) was successfully produced via a facile low temperature process with an impressive performance for oxygen reduction reaction (ORR). The incorporation of trace amounts of copper atoms (andlt; 4%) in the form of copper phthalocyanine (CuPc) noticeably enhanced activity of Sulfur/Graphite (S-G) composite for ORR. The catalytic performance was evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) methods on a rotating-disk electrode (RDE) in alkaline medium (ΔE = 0.00 to 1.20V vs. Reversible Hydrogen Electrode: RHE). The novel copper-based catalyst was shown superior efficiency compared to platinum base electrocatalyst (Pt0.2/C0.8). The number of electrons consumed (n) per O2 in Cu-S-G was found to vary between 3.87 and 3.90 at a wide range of low overpotentials, which indicates an efficient four-electron pathway from O2 to H2O. Also, the estimated Tafel slopes demonstrate insignificant amount of copper oxide in the surface of electrocatalyst. The Cu-S-G exhibits superior electroactivity durability (ΔE1/2 = -21 mV after 10,000 cycles). We believe that the rather high ORR activity (n ≈ 4 and EOnset=1.06 V vs. RHE) is governed by a unique bio-inspired structure and novel active sites formed upon the anchoring of copper atoms onto the S-G structure.

scholarly journals Effects of Sr and Mn co-doping on microstructural evolution and electrical properties of LaAlO3

2019 ◽  
Vol 13 (4) ◽  
pp. 333-341
Author(s):  
Lúcia Villas-Boas ◽  
Celso Goulart ◽  
de Ferreira
Keyword(s):  
Electrical Conductivity ◽  
Catalytic Activity ◽  
Electrical Properties ◽  
Perovskite Structure ◽  
Dopant Concentration ◽  
Microstructural Development ◽  
Co Doping ◽  
Total Electrical Conductivity ◽  
Electrode Reactions ◽  
Co Doped

In this work, we investigate the effects of Sr and Mn co-doping on the microstructural development and electrical properties of LaAlO3 synthesised by solid state reaction and sintered at 1500 and 1600?C. The addition of Sr and Mn contributed to the crystallization and stabilization of the perovskite structure. However, the addition of Sr alone lead to the formation of heterogeneous microstructure, while the combined effect of Sr and Mn improved Al and La homogeneity in the perovskite structure. Total electrical conductivity is enhanced by three orders of magnitude with Sr addition (La0.8Sr0.2AlO3-?: 5.74 ? 10?4 S/cm at 600?C) and five orders of magnitude with Mn co-doping (La0.8Sr0.2Al0.8Mn0.2O3-?: 3.6 ? 10?2 S/cm at 600?C) compared to the undoped LaAlO3 (2.96 ? 10?6 S/cm at 600?C). The Sr and Mn co-doped LaAlO3 present favourable catalytic activity for electrode reactions even with a low dopant concentration (20mol%).

FeP3 monolayer as a high-efficiency catalyst for hydrogen evolution reaction

2019 ◽  
Vol 7 (44) ◽  
pp. 25665-25671 ◽  
Author(s):  
Shuang Zheng ◽  
Tong Yu ◽  
Jianyan Lin ◽  
Huan Lou ◽  
Haiyang Xu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
High Efficiency ◽  
Low Cost ◽  
High Electrical Conductivity

An urgent and key problem in hydrogen evolution reaction (HER) is to prepare low-cost catalysts with activity comparable to that of platinum (Pt), an intrinsic large number of active sites, and high electrical conductivity.

Metallic 1T-LixMoS2 co-catalyst enhanced photocatalytic hydrogen evolution over ZnIn2S4 floriated microspheres under visible light irradiation

2018 ◽  
Vol 8 (5) ◽  
pp. 1375-1382 ◽  
Author(s):  
Junying Liu ◽  
Wenjian Fang ◽  
Zhidong Wei ◽  
Zhen Qin ◽  
Zhi Jiang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
Light Irradiation ◽  
High Electrical Conductivity ◽  
Co Catalyst ◽  
Photocatalytic Hydrogen Evolution

Metallic 1T-LixMoS2 is an effective co-catalyst for photocatalytic hydrogen evolution over ZnIn2S4 because of its high electrical conductivity and high densities of active sites.

scholarly journals Development of Paper Actuators Based on Carbon-Nanotube-Composite Paper

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1463
Author(s):  
Takahiro Ampo ◽  
Takahide Oya
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Carbon Powder ◽  
High Electrical Conductivity ◽  
Soft Actuator ◽  
Highly Efficient ◽  
Semiconducting Properties ◽  
Carbon Nanotube Composite ◽  
Composite Paper

We propose a unique soft actuator—a paper actuator—based on carbon-nanotube-composite paper (CNT-composite paper), which is a composite of carbon nanotubes (CNTs) and paper. CNT-composite paper has highly efficient properties because of the contained CNTs, such as high electrical conductivity and semiconducting properties. We are considering using CNT-composite paper for various devices. In this study, we successfully developed a paper actuator. We determined the structure of the paper actuator by referencing that of bucky-gel actuators. The actuator operates using the force generated by the movement of ions. In addition to making the paper actuator, we also attempted to improve its performance, using pressure as an index and an electronic scale to measure the pressure. We investigated the optimal dispersant for use in paper actuators, expecting the residual dispersant on the CNT-composite paper to affect the performance differently depending on the type of dispersant. Referring to research on bucky-gel actuators, we also found that the addition of carbon powder to the electrode layers is effective in improving the pressure for paper actuators. We believe that the paper actuator could be used in various situations due to its ease of processing.

scholarly journals Peroxymonosulfate Activation by Co-Doped Magnetic Mn3O4 for Degradation of Oxytetracycline in Water

2021 ◽  
Author(s):  
Liyan He ◽  
Hui Li ◽  
Jianzhi Wang ◽  
Qifei Gao ◽  
Xiaoli Li
Keyword(s):  
Active Sites ◽  
High Efficiency ◽  
Degradation Process ◽  
Catalytic Performance ◽  
Main Role ◽  
Synergistic Interactions ◽  
Catalytic Sites ◽  
Good Potential ◽  
Ph Range ◽  
Co Doped

Abstract Co-doped magnetic Mn3O4 was synthesized by the solvothermal method and adopted as an effective catalyst for the degradation of oxytetracycline (OTC) in water. Synergistic interactions between Co-Mn3O4 and Fe3O4 not only resulted in the enhanced catalytic activity through the activation of peroxymonosulfate (PMS) to degrade OTC, but also made Fe3O4/Co-Mn3O4 easy to be separated and recovered from aqueous solution. 94.2% of OTC could be degraded within 60 min at an initial OTC concentration of 10 mg/L, catalyst dosage of 0.2 g/L and PMS concentration of 10 mM, the high efficiency of which was achieved in a wider pH range of 3.0-10.0. The free radical quenching experiments showed that O2•- radicals and 1O2 played the main role in the degradation process. Co3+, Co2+, Fe2+, Fe3+, Mn4+, Mn3+ and Mn2+ on Fe3O4/Co-Mn3O4 were identified as catalytic sites based on XPS analysis. Eventually, the intermediates of OTC degradation were examined and the possible decomposition pathways were proposed. The excellent catalytic performance of Fe3O4/Co-Mn3O4 not only came from the fact that the large specific surface area could provide abundant active sites for the activation of PMS, but also the charged redistribution among atoms to accelerate the reduction of metal ions. The high degradation efficiency of OTC in actual water samples indicated that Fe3O4/Co-Mn3O4 had good potential for practical application.

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