Page 1 of 10 - About 98 Essays
  • Operating Principles In PEM Fuel Cell

    Chapter-III OPERATING PRINIPLE AND LOSSES IN PEM FUEL CELL The polymer membrane is the heart of the PEM fuel cell which has some unique features. It allows protons but it is impermeable to gases, and hence it is known as a Proton Exchange Membrane. The membrane, which is squeezed between two electrodes (electrically conductive carbon cloths or carbon fiber papers) acts as electrolyte. A layer of catalyst particles (platinum) is placed at the interface between the porous electrode and polymer membrane. A schematic diagram of cell configuration and basic operating principles is shown in Fig. 1.1. Hydrogen, which is fed into one side of the membrane, splits into its primary elements, i.e., one proton and one electron at anode. Protons will pass…

    Words: 1940 - Pages: 8
  • Floating Slimes Essay

    Silver, lead, arsenic, bismuth, antimony, selenium, and nickel are common impurities existing in copper anodes. Some impurities dissolved from the anodes can precipitate, if their concentrations in the electrolytic solution are above saturation levels. Some of these precipitates can settle down but some are floating slimes and can be a source of cathode contamination by their incorporation into the cathode 16. These floating slimes are amorphous and typically have compositions of Sb-As-O and…

    Words: 1864 - Pages: 8
  • Compare The Construction And Operation Of A Ni-Cad Battery With A Lead-Acid Battery

    Q1. Describe the construction and operation of a Ni-Cad battery. Compare and contrast the Ni-Cad battery with a Lead-Acid battery. a. Construction: figure 1. Ni-cad battery construction Ni-Cad battery refers to Nickel-cadmium battery which is widely used in industrial world. Basically, the Ni-Cad battery consists of positive and negative plates, separators, electrolyte, cell vent, and cell container. The positive plate in Ni-Cad battery is Nickel Hydroxide Ni(OH)2. However, the negative…

    Words: 1065 - Pages: 5
  • Lithium Ion Battery Case Study

    The Anode What is Anode? What is anode fabricated from in Li-ion battery? What material could be replacement of ion material however failed? What is design and structure of anode in Lithium ion(Lithium ) battery? What is the reaction/process that are undergoing in anode? What are the recent advancements in anode of Lithium ion(Lithium ) battery? What are the challenges that are still left in the field? 1) The anode is the negative electrode of a galvanic cell and is related to the oxidation…

    Words: 922 - Pages: 4
  • The Function Of OLED (Organic Light Emitting Diode)

    To let an OLED light up we basically connect a voltage across the anode and cathode. When electricity begin to flow, the cathode receive electrons from the power source and the anode drops them so the extra electrons make the emissive layer negatively charged whereas the conductive layer turn out to be positively charged, after that the positive holes will grow to be much more movable than the negative electrons thus they bound across the boundary from conductive layer to emissive layer. When a…

    Words: 1005 - Pages: 5
  • Three Types Of Electrochemical Theory Of Corrosion

    This type of Corrosion occurs when the two non-similar metals are dipped partially or are immersed in solution or when the metal comes in contact with a liquid which is conducting. A Galvanic cell forms on the surface of metal and Therefore, some part of metal surface acts as anode and other as cathode. The chemical in the environment and humidity acts as an electrolyte. So the Oxidation of anodic part takes place and therefore corrosion product is formed on the surface of the metal…

    Words: 1390 - Pages: 6
  • Schematic Principles Of The Principle Of Electro Chemical Machining

    1.2 Principle of ECM Electrochemical machining removes material from the work piece by electrochemical process. The working principle is anodic dissolution in which the work piece as anode and the tool as cathode. Both electrodes are immersed in the electrolyte and electrical applied to these electrodes. The electric conduction is achieved through the movements of ions between the anode and cathode through the electrolyte. The current is passing through the system of arrangements will cause the…

    Words: 920 - Pages: 4
  • What Affects The Rate Of Corrosion

    factors stay constant, the quantity of corrosion is cut in 0.5. 3) Contact Resistance The contact resistance of the anode to electrolyte and of the cathode to electrolyte is a component of the overall corrosion cell resistivity—the lower the contact resistance, the greater the corrosion current. As the contact resistance increases, the corrosion cell current will decrease. The decrease will be in relation to the sum of the total resistance of the circuit. That is, the resistance of the…

    Words: 1106 - Pages: 5
  • Ultrasonic Interferometer Essay

    The ultrasonic waves move normally from the quartz crystal till they are reflected back from the movable plate and the standing waves are formed in the liquid in between the reflector plate and the quartz crystal. The micrometer is slowly moved till the anode current on the meter on the high-frequency generator shows a maximum. A number of maxima readings of anode current are noted and their number N counted. The total distance thus moved by the micro meter gives the value of wavelength with the…

    Words: 816 - Pages: 4
  • Battery Essay

    usually the anode is where the negative electrode end (anode) oxidation takes place when the battery is in use. The positive electrode end of an electrical component is known as the cathode, where the positive end (cathode) reduction takes place simultaneously with the oxidation process. Lastly the electrolyte is the part which ionically conducts and insulates the electric current. We can examine each of these battery components and understand what their process is during the oxidation-reduction…

    Words: 1958 - Pages: 8
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