Thrifting iridium for hydrogen

Pendergast, Andrew D.; Boettcher, Shannon W.

doi:10.1126/science.adv4929

Thrifting iridium for hydrogen

Journal Article · Thu Feb 13 23:00:00 EST 2025 · Science

DOI:https://doi.org/10.1126/science.adv4929· OSTI ID:2538436

Pendergast, Andrew D. ^[1]; Boettcher, Shannon W. ^[2]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States); Univ. of Oregon, Eugene, OR (United States)

Using renewable electricity to produce hydrogen fuel reduces reliance on fossil fuels. Proton exchange membrane water electrolyzers (PEMWEs) are the highest-performing commercialized technology. These devices split water into oxygen gas and hydrogen ions (protons) at the anode. The protons then migrate through an ion-conducting polymer membrane (ionomer) to be reduced to hydrogen gas at the cathode. Further, the anode reaction’s harsh environment requires the use of precious-metal catalysts, such as iridium oxide (IrO_x). Given the expense and scarcity, the design of electrodes that minimize the use of precious metals without compromising the requisite stability and activity is desired for large-scale hydrogen production. On page 791 of this issue, Shi et al. report that anchoring IrO_x catalysts onto porous cerium-oxide (CeO_x) supports maintains performance even with much reduced precious metal use.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2538436

Journal Information:: Science, Journal Name: Science Journal Issue: 6735 Vol. 387; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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