• Carbon capture via seawater electrolysis
    sustaining the planet through innovation


Why does excess CO2 contribute to the climate crisis?

The climate crisis is nearing the point of being irreversible. When examining the causes of a calamity like this it’s safe to say that there are more than one, but carbon dioxide emissions are certainly a large contributor, especially as they are caused by human activity.

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What will Cequest do to remove CO2 as well as help the ocean?

With Cequest, we will lower the pH of seawater via electrolysis so that CO2 is captured then combined with a dissolved mineral carbonate to form a mineral bicarbonate while also reacting a basic solution with the air, so concentrating dissolved CO2 in the ocean and removing CO2 from the atmosphere at the same time.

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Get to know the team that developed Cequest

Cequest is harnessing seawater to develop the next generation of carbon capture.

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About Cequest

Cequest uses electrolysis to capture both atmospheric and oceanic carbon dioxide to put it to a better use. We produce clean hydrogen fuel to be utilized for electricity, as well as a bicarbonate that can combat ocean acidification.

Pumping Seawater

Seawater will be pumped to the plant for the reaction to occur. About 10% of the water will need to be filtered as RO water.

Wind for Power

A renewable source of energy will power the electrolysis reaction. Wind energy is so far our best bet.

Starting the Reaction

The electrolysis reaction will take place in a Electrolytic Cation Exchange Module (E-CEM), taking in the seawater and RO water to produce sodium hydroxide and hydrogen gas.

Into the Membrane

Acidified seawater is transported to a hollow fiber membrane contactor to extract the CO2. Simultaneously, CaCO3 (crushed limestone) is added, then recombined with the CO2 to precipitate dissolved Ca(HCO3)2 which represents long-term (hundreds of millions of years) carbon sequestration.

Bubbling NaOH

The sodium hydroxide (NaOH) solution that is present at the cathode will be bubbled for 0.5–1.5 hours to react with carbon dioxide in the air to form sodium bicarbonate (NaHCO3).

Into the Fuel Cell

The fuel cell will convert the hydrogen gas to electrical energy, with the only biproduct being water.

Spurring Marine Life

The sodium and calcium bicarbonates that are produced is then released back into the ocean to help combat ocean acitidy and further sequester carbon.


tonnes of CO2 removed daily per plant


tonnes of H2 produced per plant everyday day


Dollar price for each tonne of CO2 removed


Plants needed to reduce 10 Gt of CO2 per year