electrolysis
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DAIVIN!
DAIVIN! is a San Francisco deep-tech startup (Y Combinator W26) building tankless dive gear that generates breathable oxygen on demand from water. Using electrolysis to split H2O into oxygen and hydrogen, its wearable vest and battery belt let divers breathe underwater without carrying pressurized tanks - limited only by battery life. Founded in 2025 by electrical engineer and certified diver Leo Kankkunen, the company frames oxygen delivery as an energy problem rather than a logistics one, with a long-term vision spanning diving, emergency response, aviation, medicine, and space.
錫力科技 YC Synergy
錫力科技 (YC Synergy) is a Taiwan-based clean-energy company building hydrogen fuel cell power systems and end-to-end hydrogen infrastructure - electrolysis-based green hydrogen production, storage, and refueling. Founded in 2012 and headquartered in Xindian, New Taipei City, the firm designs and integrates fuel cell systems for stationary power, maritime vessels, and road transport, working with partners such as Germany's EKPO Fuel Cell Technologies and Stan Shih's zero-carbon ship venture Porrima. It was named Asia-Pacific Fuel Cell System Company of the Year by Energy Tech Review in 2024.
General Galactic
General Galactic is an El Segundo, California deep-tech startup building water-based propulsion and propellant-generation systems for spacecraft. Its Genesis platform splits water via electrolysis into hydrogen and oxygen, powering a multimode engine that pairs high-thrust chemical burns with efficient electric maneuvering. Founded in 2023 by Stanford-trained, ex-SpaceX and ex-Varda engineers, the company frames itself as the future 'energy and logistics company' of the solar system - and is applying the same electrolysis reactor tech on Earth to turn waste CO2 into fossil-free natural gas.
Hgen
Hgen is a Los Angeles-area climate-tech company building higher-efficiency alkaline electrolyzers that convert water and renewable electricity into clean, low-cost hydrogen for heavy industry. Founded in 2021 by former Tesla and SpaceX engineers, Hgen redesigned the electrolyzer cell to shed hydrogen bubbles faster, claiming roughly 20x higher power density and a much smaller footprint than conventional alkaline systems. The company packages its technology into shipping-container-sized units that need only water and electricity, aiming to undercut the cost of trucked-in liquid hydrogen and help decarbonize chemicals, steel, and other industrial processes.
Tidal Metals
Tidal Metals is a Trenton/Hamilton, New Jersey deep-tech company that extracts primary magnesium metal from seawater and desalination brine using nothing but renewable electricity and physical processes - no ore mining, no carbon emissions, and no waste stream. Founded by three plasma-physics PhDs who met at the Princeton Plasma Physics Laboratory, the company aims to rebuild a domestic U.S. magnesium supply chain currently dominated by China, serving aerospace, defense, and next-generation automotive manufacturing.
Magrathea
Magrathea is an Oakland, California clean-tech company rebuilding American magnesium production. Using a next-generation electrolytic process, it makes magnesium metal from seawater and brines with near-zero carbon emissions, aiming to break the West's dependence on Chinese supply for a metal critical to aerospace, automotive, and defense.