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Comment Processing & Handling

Compressing hydrogen electrochemically

By Gerald Ondrey |

Kaji Technology Corp. (Osaka; www.kajitech.com) and Toray Industries, Inc. (Tokyo, both Japan; www.toray.com) have jointly completed developing and demonstrating an electrochemical hydrogen pump system earlier this year. This effort was part of a project, funded by the New Energy and Industrial Technology Development Organization (NEDO; Kawasaki, Japan), aimed at reducing the costs of H2-refueling stations. The electrochemical hydrogen pump system, including a polymer electrolyte membrane (PEM) stack (diagram), compresses H2 using renewable energy to perform the oxidation-reduction reactions. H2 is supplied to the anode side of the catalyst-coated membrane (CCM), where a Pt-alloy catalyst splits the molecule into protons. The electrons are transferred via an external circuit to a catalyst layer on the other side of the PEM, where the protons recombine as H2 on the cathode side. Kaji Technology and Toray are targeting the commercialization of a system that produces 4.1 Nm3/h of H2 at 40 MPa pressure. Toray is in charge of developing the PEM and stack. Kaji Technology developed the combined package of electrochemical H2 pump system with the stack. A 19.6-MPa electrochemical H2 pump system supplied by HyET Hydrogen B.V. (Arnhem, the…
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