Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium

Zhu, Jiawei; Chen, Zitao; Xie, Minghao; Lyu, Zhiheng; Chi, Miaofang; Mavrikakis, Manos; Jin, Wanqin; Xia, Younan

doi:10.1002/anie.201901732

Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium

Journal Article · Fri Mar 08 00:00:00 EST 2019 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201901732· OSTI ID:1571237

Zhu, Jiawei ^[1]; Chen, Zitao ^[2]; Xie, Minghao ^[3]; Lyu, Zhiheng ^[3]; Chi, Miaofang ^[4]; Mavrikakis, Manos ^[5]; Jin, Wanqin ^[6]; ^[3]

Georgia Inst. of Technology, Atlanta, GA (United States); Nanjing Tech Univ. (China); University of Wisconsin-Madison
Georgia Inst. of Technology, Atlanta, GA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Wisconsin, Madison, WI (United States)
Nanjing Tech Univ. (China)

We report a highly active and durable water oxidation electrocatalyst based on cubic nanocages with a composition of Ir₄₄Pd₁₀, together with well-defined {100} facets and porous walls of roughly 1.1 nm in thickness. Such nanocages substantially outperform all the water oxidation electrocatalysts reported in literature, with an overpotential of only 226 mV for reaching 10 mA·cm^-2_geo at a loading of Ir as low as 12.5 μg_Ir cm^-2 on the electrode in acidic media. When benchmarked against a commercial Ir/C electrocatalyst at 250 mV of overpotential, such a nanocage-based catalyst not only shows enhancements (18.1- and 26.2-fold, respectively) in terms of mass (1.99 A·mg^-1_Ir) and specific (3.93 mA·cm^-2_Ir) activities, but also greatly enhanced durability. The enhancements can be attributed to a combination of multiple merits, including a high utilization efficiency of Ir atoms and an open structure beneficial to the electrochemical oxidation of Ir to the active form of IrO_x.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER15731

OSTI ID:: 1571237

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 22 Vol. 58; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
acidic media
iridium
nanocages
ultrathin walls
water oxidation

Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium

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