Toshiba’s new large-scale manufacturing expertise for electrolysis electrodes cuts iridium use to 1/10


Toshiba Company has developed large-scale manufacturing expertise for electrolysis electrodes that notice excessive stage effectivity in Energy to Gasoline (P2G) expertise whereas decreasing using iridium, one of many world’s rarest treasured metals, to 1/10.

P2G makes use of electrolysis of water to transform renewable vitality into hydrogen, for storage and transportation to the place it’s wanted. Polymer Electrolyte Membrane (PEM) electrolysis is seen as a extremely promising conversion methodology, as it’s reacts quickly to energy fluctuations and is very sturdy. Nevertheless, PEM makes use of iridium because the catalyst in its electrodes. Sensible software requires discount of the iridium used.

Toshiba developed an iridium oxide nanosheet laminated catalyst that lowered the iridium requirement to 1/10 in 2017. The corporate has now developed large-scale manufacturing expertise that deposits the catalyst over a most space of 5m2 at one time. This advance may drive ahead the early commercialization of P2G for large-scale energy conversion; Toshiba is aiming for commercialization in FY2023 or after.


PEM makes use of a membrane electrode meeting (MEA) that integrates the electrolyte membrane and electrode.

Massive-scale hydrogen conversion of electrical energy requires a lot of MEAs, and forecasts anticipate a market scale of roughly $580 million by 2028.

Nevertheless, the MEA electrode depends on a considerable amount of iridium to make sure enough electrolytic effectivity. Iridium is among the rarest of treasured metals. Annual international manufacturing is within the area of seven to 10 tons, far lower than the 200 tons of platinum, and it prices 4 to 5 occasions extra. Forming electrodes requires a uniform coating of nice iridium oxide particles, however decreasing the iridium oxide leads to uneven software and non-uniform reactions that degrade water electrolysis efficiency.

Toshiba’s multilayer catalyst makes use of a brand new sputtering expertise to deposit alternate layers of iridium oxide nanosheet movies and void layers. In sputtering, ions, corresponding to argon, bombard a deposition materials, the goal, in a vacuum, and deposit the ejected particles on a substrate.


In Toshiba’s course of, iridium is the goal, and a skinny movie of iridium oxide is fashioned by injecting oxygen because the goal is deposited on the substrate. Thickness management is on the nanometer stage, realizing deposition of uniform iridium oxide layers of with a smaller quantity of iridium.


Buildings of Oxide Nanosheet and MEA developed by Toshiba

Utilizing Toshiba’s laminated nanosheet construction within the catalyst layer efficiently reduces the required iridium to 1/10, whereas sustaining the water electrolysis efficiency. It additionally considerably expands the deposition floor space. As sputtering is performed in a vacuum, deposition on a big space is troublesome.


Comparative effectivity of powdered and sputtered catalysts, by iridium load

Nevertheless, by modifying the deposition distribution ratio for a number of steel targets, together with iridium, and the oxygen enter stage, Toshiba has efficiently developed a large-scale manufacturing expertise that realizes catalyst deposition on an space of as much as 5m2 at a time.

In collaboration with Toshiba Power Methods & Options Company, Toshiba has constructed MEA prototypes with electrodes primarily based on the developed expertise, and has begun analysis testing with a water electrolyzer producer. Going ahead, the Firm will enhance the yield and high quality towards mass manufacturing of MEA, aiming for commercialization in FY2023 or after.


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