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Water splitting is the chemical reaction in which water is broken down into oxygen and hydrogen: [1] 2 H 2 O → 2 H 2 + O 2 Efficient and economical water splitting would be a technological breakthrough that could underpin a hydrogen economy .
The ongoing development in materials science and cell design is likely to enhance the viability of photoelectrolysis, making it a key player in the future landscape of renewable energy technologies. Continued research and investment in overcoming existing challenges will be crucial to harness the full potential of this technology.
The process of water-splitting is a highly endothermic process (ΔH > 0). Water splitting occurs naturally in photosynthesis when the energy of four photons is absorbed and converted into chemical energy through a complex biochemical pathway (Dolai's or Kok's S-state diagrams). [3] O–H bond homolysis in water requires energy of 6.5 - 6.9 eV ...
The water electrolyte is isolated from the electrodes by a porous, hydrophilic separator. The water is drawn into the electrolyzer by capillary action, while the electrolyzed gases pass out on either side. It extends PEM technology by eliminating bubbles that reduce the contact between the electrodes and the electrolyte, reducing efficiency.
On October 31, 2011, ITT Corporation spun off its defense and water technology businesses to form three separate, publicly traded companies: [5] Exelis Inc., a global aerospace, defense, information and services company headquartered in Tysons Corner, Virginia. Xylem Inc., a water technology firm. ITT Corporation, a manufacturing firm.
Water splitting can be done at higher pH values as well however the standard potentials will vary according to the Nernst equation and therefore shift by -59 mV for each pH unit increase. However, the total cell potential (difference between oxidation and reduction half cell potentials) will remain 1.23 V.
These business groups provide fluid management products and systems to customers in biotechnology, pharmaceutical, transfusion medicine, energy, electronics, municipal and industrial water purification, aerospace, transportation and broad industrial markets. The company was founded by David B. Pall in 1946 as Micro Metallic Corporation. [12]
The mechanism for splitting water involves absorption of three photons before the fourth provides sufficient energy for water oxidation. [4] Based on a widely accepted theory from 1970 by Kok, the complex can exist in 5 states, denoted S 0 to S 4 , with S 0 the most reduced and S 4 the most oxidized.