염수전기분해(Chlor-Alkali)에서 음극(Cathode)에 대한 영문 PPT 자료
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- 2022.01.28
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- 2017.01
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염수전해공정(Chlor-Alkali)에서 음극(Cathode)에 대한 문헌 자료의 PPT
목차
1. Introduction
2. Criteria for Low Overvoltage Hydrogen Cathode
2.1. Cost/Life
2.2. Electrocatalytic Activity
2.3. Stability Under Open-Circuit Conditions
2.4. Selection of the Coating Technique
2.5. Product Purity
3. Methods Employed to Realize High Surface Area
4. Cathode Materials and Compositions
4.1. Raney Nickel
4.2. Ni-Mo-Based Coatings
4.3. Other Ni-Based Materials
4.4. Oxides
4.5. Sulfides
4.6. In Situ Activation
5. HER Mechanisms on Low Overvoltage Cathodes
6. Cathode Deactivation
4.6.7. Current Status
본문내용
→ Several methods for high surface area coating on Fe or Ni
• Plasma spraying, Thermospraying, Electrodeposition, Themal decomposition
• Limited “throwing power” of the various coating methods
→ Consider operating Temp. & complexity of structure before choosing coating technique
• Extremely difficult to coat entire cathode in highly complex diaphragm cell
• Coating technique at high temperature - Distortion of the cathode
→ Skew of current distribution in the cell & Increase the structural ohmic drop
4.6.2.5. Product purity
→ In chlor-alkali cell - two parasitic cathode reaction
• OCl- + H2O + 2e- --> Cl- + 2OH-
→ Reaction at all metals under limiting current density conditions
• ClO3- + 3H2O + 6e- --> Cl- + 6OH-
→ Kinetically slow reaction & only on iron-based surfaces at low current densities
→ Advantage for iron-based cathode : When presence of chlorate as undersirable impurity
참고 자료
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