Pathway to Complete Energy Sector Decarbonization with Available Iridium Resources using Ultralow Loaded Water ElectrolyzersPathway to Complete Energy Sector Decarbonization with Available Iridium Resources using Ultralow Loaded Water Electrolyzers

Pathway to Complete Energy Sector Decarbonization with Available Iridium Resources using Ultralow Loaded Water ElectrolyzersPathway to Complete Energy Sector Decarbonization with Available Iridium Resources using Ultralow Loaded Water Electrolyzers

TitlePathway to Complete Energy Sector Decarbonization with Available Iridium Resources using Ultralow Loaded Water ElectrolyzersPathway to Complete Energy Sector Decarbonization with Available Iridium Resources using Ultralow Loaded Water Electrolyzers
Publication TypeJournal Article
Year of Publication2020
AuthorsZachary Taie, Xiong Peng, Devashish Kulkarni, Iryna V Zenyuk, Adam Z Weber, Christopher Hagen, Nemanja Danilovic
JournalACS Applied Materials & Interfaces
Volume12
Issue47
Pagination52701 - 52712
Date Published11/2020
ISSN1944-8244
Abstract

We present ultralow Ir-loaded (ULL) proton exchange membrane water electrolyzer (PEMWE) cells that can produce enough hydrogen to largely decarbonize the global natural gas, transportation, and electrical storage sectors by 2050, using only half of the annual global Ir production for PEMWE deployment. This represents a significant improvement in PEMWE's global potential, enabled by careful control of the anode catalyst layer (CL), including its mesostructure and catalyst dispersion. Using commercially relevant membranes (Nafion 117), cell materials, electrocatalysts, and fabrication techniques, we achieve at peak a 250× improvement in Ir mass activity over commercial PEMWEs. An optimal Ir loading of 0.011 mgIr cm–2 operated at an Ir-specific power of ∼100 MW kgIr–1 at a cell potential of ∼1.66 V versus RHE (85% higher heating value efficiency). We further evaluate the performance limitations within the ULL regime and offer new insights and guidance in CL design relevant to the broader energy conversion field.

DOI10.1021/acsami.0c15687
Short TitleACS Appl. Mater. Interfaces
Refereed DesignationRefereed