Corrosion-resistant non-noble metal electrodes for PEM-type water electrolyzer. (11th November 2021)

• Record Type: Journal Article
• Authors: Tajuddin, Aimi Asilah Haji; Elumalai, Ganesan; Xi, Zeyu; Hu, Kailong; Jeong, Samuel; Nagasawa, Kensaku; Fujita, Jun-ichi; Sone, Yoshitsugu; Ito, Yoshikazu
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 78(2021)
• Page Start: 38603
• Page End: 38611
• Publication Date: 2021-11-11
• Subjects: Non-noble metal -- Electrocatalyst -- Cathode -- Hydrogen generation -- PEM-Type water electrolysis; PEM Polymer electrolyte membrane -- G Pristine graphene -- NG N-doped graphene -- CP Carbon paper -- CVD Chemical vapor deposition -- MEA Membrane-electrode assembly -- PTL Porous transport layer -- SEM Scanning electron microscope -- AST Accelerated stress test -- CA Chronoamperometry -- EIS Electrochemical impedance spectroscopy -- TEM Transmission electron microscope -- XRD X-ray diffraction -- XPS X-ray photoelectron spectroscopy; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.09.116
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Developing cheap and highly durable non-noble metal catalysts for water electrolysis to sustainably produce hydrogen as alternatives to platinum-based catalysts is essential. Herein, we report graphene-encapsulated NiMo alloys as acid-stable non-noble metal catalyst electrodes. The graphene-encapsulated NiMo cathode showed a highly stable performance in the potential cycling test (10, 000 cycles) from 0 to 5.0 A cm −2 and 100 h of durability at a 2.2 V constant cell voltage. A balance between catalytic activity and corrosion in acidic environments was achieved by tuning the number of N-doped graphene layers. Through their application in a full-cell PEM-type water electrolyzer, we verify that noble metal catalysts can be replaced by non-noble metal catalysts. Such cheap acid-stable non-noble metal electrodes have promising practical applications in PEM-type water electrolysis. Highlights: Preparation of graphene-encapsulated NiMo cathode catalysts. Performance validation of non-noble metal catalysts in PEM-type water electrolysis. For replacement of conventional noble metal catalysts that are expensive. Various applications involving acidic environments.