The Relative Electrocatalytic Activity of Noble Metals in the Oxidation of Ethylene

1964 ◽  
Vol 111 (6) ◽  
pp. 728 ◽  
Author(s):  
Harald Dahms ◽  
John O'M. Bockris
Keyword(s):  
Electrocatalytic Activity ◽  
Noble Metals

Morphology controlled surface sulfurized CoMn2O4 microspikes electrocatalyst for water splitting with excellent OER rate for binder-free electrocatalytic oxygen evolution

2021 ◽  
Author(s):  
Ali Bahadur ◽  
Waseem Hussain ◽  
Shahid Iqbal ◽  
Farman Ullah ◽  
Muhammad Shoaib ◽  
...  
Keyword(s):  
Transition Metal ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Binder Free ◽  
Synthesis Routes

Transition metal mixed oxides have drawn extensive interest as oxygen evolution electrocatalysts alternatives to noble metals-based material but generally involve prolonged synthesis routes and limited electrocatalytic activity and stability. Herein...

Tuning the Fe-N4 sites by introducing Bi-O bond in Fe-N-C system for promoting oxygen reduction reaction

2021 ◽  
Author(s):  
Huihui Jin ◽  
Jiawei Zhu ◽  
Ruohan Yu ◽  
Wenqiang Li ◽  
Pengxia Ji ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Perovskite Oxides ◽  
Reduction Reaction ◽  
Reduction Activity

Elemental Bi is effective in optimizing the electrocatalytic activity of perovskite oxides and noble metals, but has never been used to adjust the oxygen reduction activity of Fe/N-C catalysts. Here,...

scholarly journals Electrocatalytic Activity of Galvanostatically Deposited Ni thin Films for Methanol Electrooxidation

2019 ◽  
Author(s):  
Maria Paula Salinas-Quezada ◽  
D. Alfonso Crespo-Yapur ◽  
Abraham Cano-Marquez ◽  
Marcelo Videa
Keyword(s):  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Supporting Electrolyte ◽  
Surface Concentration ◽  
Thin Layers ◽  
Synthetic Methods ◽  
Constant Current ◽  
Direct Alcohol Fuel Cells ◽  
Oxidation Of Methanol ◽  
Polycrystalline Gold

Nickel and nickel-based nanomaterials are an attractive choice to replace noble metals as electrocatalyst in alkaline direct alcohol fuel cells (DAFCs) owing to their lower cost and suitable electrocatalytic activity. Among the different synthetic methods available for the production of nanostructured materials, galvanostatic electrodeposition offers a fast and simple means of fabricating active electrodes. Therefore, thin-layers of nickel were electrodeposited onto polycrystalline gold electrodes using constant current pulses from an electrolyte containing 50 mM NiSO4. The electrocatalytic properties of the nickel nanostructures in alkaline medium, in which the catalytic species NiOOH is formed, were evaluated through cyclic voltammetry in 0.5 M methanol + 1 M KOH. The effects of current density pulse and the presence of sulfate or chloride anions in the supporting electrolyte on the electrocatalytic activity of the deposits were studied using Ni(OH)2 surface concentration, Gamma, and electrocatalytic intensity, EI, as performance parameters. It was found that highest electrolcatalytic activities were obtained when using current densities pulses close to 4.0 mA/cm2 in the presence of sulfates. It was found that the presence of sulfates leads to a strong correlation between the electrocatalytic activity for the oxidation of methanol and the surface concentration of Ni(OH)2.

Unconventional molybdenum carbide phases with high electrocatalytic activity for hydrogen evolution reaction

2019 ◽  
Vol 7 (30) ◽  
pp. 18030-18038 ◽  
Author(s):  
Chaoyun Tang ◽  
Hui Zhang ◽  
Kuofeng Xu ◽  
Qianling Zhang ◽  
Jianhong Liu ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Hydrogen Evolution ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Molybdenum Carbide ◽  
Energy Devices ◽  
Metal Free ◽  
Carbide Phases

The development of noble metal-free catalysts, which can replace noble metals for various electrocatalytic reactions in renewable energy devices is of huge interest. Here, we report nanoporous α-MoC1−x and η-MoC nanosheets electrocatalysts for HER.

Pd–Zn nanocrystals for highly efficient formic acid oxidation

2018 ◽  
Vol 8 (18) ◽  
pp. 4757-4765 ◽  
Author(s):  
Xinran Zhang ◽  
Hongsheng Fan ◽  
Jinlong Zheng ◽  
Sibin Duan ◽  
Yunxia Huang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Formic Acid ◽  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Highly Efficient ◽  
Highly Uniform

Highly uniform Pd–Zn nanocrystals were facilely fabricated with coexisting noble metals and ascorbic acid, which exhibited superior electrocatalytic activity for formic acid oxidation.

Growth of near noble metal Pd and Pt thin film silicides morphology and structure

1984 ◽  
Vol 42 ◽  
pp. 498-499
Author(s):  
E. I. Alessandrini ◽  
M. O. Aboelfotoh
Keyword(s):  
Noble Metals ◽  
Annealing Temperature ◽  
Chemical Compounds ◽  
Barrier Properties ◽  
Solid State Reactions ◽  
Transmission Electron ◽  
Stable Chemical ◽  
Metal Thickness ◽  
Amorphous Si ◽  
Si Films

Considerable interest has been generated in solid state reactions between thin films of near noble metals and silicon. These metals deposited on Si form numerous stable chemical compounds at low temperatures and have found applications as Schottky barrier contacts to silicon in VLSI devices. Since the very first phase that nucleates in contact with Si determines the barrier properties, the purpose of our study was to investigate the silicide formation of the near noble metals, Pd and Pt, at very thin thickness of the metal films on amorphous silicon.Films of Pd and Pt in the thickness range of 0.5nm to 20nm were made by room temperature evaporation on 40nm thick amorphous Si films, which were first deposited on 30nm thick amorphous Si3N4 membranes in a window configuration. The deposition rate was 0.1 to 0.5nm/sec and the pressure during deposition was 3 x 10 -7 Torr. The samples were annealed at temperatures in the range from 200° to 650°C in a furnace with helium purified by hot (950°C) Ti particles. Transmission electron microscopy and diffraction techniques were used to evaluate changes in structure and morphology of the phases formed as a function of metal thickness and annealing temperature.

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

A crystalline–amorphous Ni–Ni(OH)2 core–shell catalyst for the alkaline hydrogen evolution reaction

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Alkaline Conditions

Crystalline–amorphous Ni–Ni(OH)2 core–shell assembled nanosheets exhibit outstanding electrocatalytic activity and stability for hydrogen evolution under alkaline conditions.

Sign in / Sign up

Export Citation Format

Share Document