Water Electrolysis with Earth-Abundant Elements

  • ChemPubSoc Europe Logo
  • Author: Angewandte Chemie International Edition
  • Published Date: 17 April 2019
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Water Electrolysis with Earth-Abundant Elements

Hydrogen is a promising energy carrier for a carbon-free economy. One of the ways to produce renewable hydrogen is using photovoltaic (PV) electricity to electrolyze water. This can be achieved with a proton-exchange membrane water electrolyzer (PV-PEM). However, the PEM creates a locally acidic environment. The only commercially available oxygen evolution catalyst that works under these conditions is IrOx, which is based on one of the scarcest elements in the Earth's crust. Hence, the development of alternative catalysts based on earth-abundant elements would be useful.


Ryuhei Nakamura, RIKEN, Japan, Hongxian Han, Chinese Academy of Sciences, China, and colleagues have discovered that γ-MnO2 can catalyze water oxidation under acidic conditions. The team prepared γ‐MnO2 directly on fluorine‐doped tin oxide (FTO) or carbon‐based substrates by thermal decomposition of manganese nitrate in air at 220 °C.


The catalyst is stable for over 8,000 hours with a stable potential window between 1.6 V and 1.75 V. A voltage efficiency of 70 % was achieved in a PEM electrolyzer. This work demonstrates that it is possible to develop acid-stable earth-abundant OER catalysts to replace IrOx, making PV-PEM a viable means for renewable hydrogen production.


 

Article Views: 1063

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH