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DIFFERENT TYPES OF CELLS

DIFFERENT TYPES OF CELLS. CELL CELL IS A DEVICE WHICH CONVERT CHEMICAL ENERGY INTO ELECTRICAL ENERGY AND VICE VERSA. TYPES OF CELLS ELECTROCHEMICAL CELL :A DEVICE WHICH CONVERT CHEMICAL ENERGY INTO ELECTRICAL ENEGRY eg DRY CELL, ,ZINC CADMIUM CELL & FUEL CELL

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DIFFERENT TYPES OF CELLS

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  1. DIFFERENT TYPES OF CELLS

  2. CELL CELL IS A DEVICE WHICH CONVERT CHEMICAL ENERGY INTO ELECTRICAL ENERGY AND VICE VERSA

  3. TYPES OF CELLS ELECTROCHEMICAL CELL:A DEVICE WHICH CONVERT CHEMICAL ENERGY INTO ELECTRICAL ENEGRY eg DRY CELL, ,ZINC CADMIUM CELL & FUEL CELL ELECTROLYTIC CELL:-A DEVICE WHICH CONVER ELECTRICAL ENERGY INTO CHEMICAL ENERGY egDOWNS CELL, CASTNER-KELLNER CELL

  4. – + – + – + The electrolytic cell • Electric current forces charges on electrodes Na+ Na+ Cl– Cl– • Na+ is attracted to negative, Cl– to positive • Na+ takes up an electron: Na+(aq) + e– Na • Cl– gives up an electron: 2Cl–(aq)  Cl2 + 2e– • Thus electricity continues to flow • Pure Na is deposited, Cl2 gas is produced

  5. Dry cell At anode zn-------------------zn2++2e- At cathode 2 MnO2+2NH4++2e---Mn2O3 +H2O+2NH3( ) NH3 IS CONSUMED IN COMPLEX FORMATION WITH Zn 2+ ION Zn2++4NH3 ---------------- [Zn(NH3)4}2+ -----------[Zn(NH3)4]Cl2 At anode Zn-------------------Zn2++2e- At cathode 2 MnO2+2NH4++2e---Mn2O3 +H2O+2NH3( ) NH3 IS CONSUMED IN COMPLEX FORMATION WITH Zn 2+ ION Zn2++4NH3 --- [Zn(NH3)4}2+ --------2Cl------[Zn(NH3)4]Cl2

  6. The Lead storage battery.

  7. ELECTRODE REACTIONS IN LEAD STORAGE BATTERY

  8. Fuel cell Cathode: O2(g) + 2H2O(l ) + 4e–⎯→ 4OH–(aq) Anode: 2H2 (g) + 4OH–(aq) ⎯→ 4H2O(l) + 4e– OVERALL REACTION 2H2(g) + O2(g) ⎯→ 2 H2O(l )

  9. MERITS OF FUEL CELL ECO FRIENDLY CONTINUOUS SOURSE OF ENERGY HIGH EFFICIENCY DEMERITS OF FUEL CELL VERY EXPENSIVE HEAVY NOT CONVENIENT TO USE HIGHLY CORROSIVE NATURE OF THE ELECTROLYTE

  10. THANKS

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