articleJournal of the American Chemical SocietyJan 23, 2019GREEN OA

Breaking Long-Range Order in Iridium Oxide by Alkali Ion for Efficient Water Oxidation

JGJiajian GaoCXCong‐Qiao XuSHSung‐Fu HungWLWei LiuWCWeizheng Cai

Nanyang Technological University · Tsinghua University · +4 more institutions

PubMed
Indexed incrossrefpubmed

Abstract

Oxygen electrochemistry plays a critical role in clean energy technologies such as fuel cells and electrolyzers, but the oxygen evolution reaction (OER) severely restricts the efficiency of these devices due to its slow kinetics. Here, we show that via incorporation of lithium ion into iridium oxide, the thus obtained amorphous iridium oxide (Li–IrOx) demonstrates outstanding water oxidation activity with an OER current density of 10 mA/cm2 at 270 mV overpotential for 10 h of continuous operation in acidic electrolyte. DFT calculations show that lithium incorporation into iridium oxide is able to lower the activation barrier for OER. X-ray absorption characterizations indicate that both amorphous Li–IrOx and…

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527
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Authors

12

Topics & keywords

Topics
Keywords
  • Chemistry
  • Oxygen evolution
  • Iridium
  • Overpotential
  • Amorphous solid
  • Rutile
  • Oxide
  • Inorganic chemistry
UN Sustainable Development Goals
  • Industry, innovation and infrastructure
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