Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium
Abstract
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-2geo at a loading of Ir as low as 12.5 μgIr 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-1Ir) and specific (3.93 mA·cm-2Ir) 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 IrOx.
- Authors:
-
[3]
- Georgia Inst. of Technology, Atlanta, GA (United States); Nanjing Tech Univ. (China)
- 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)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1571237
- Grant/Contract Number:
- FG02-05ER15731
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Angewandte Chemie (International Edition)
- Additional Journal Information:
- Journal Name: Angewandte Chemie (International Edition); Journal Volume: 58; Journal Issue: 22; Journal ID: ISSN 1433-7851
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; iridium; nanocages; ultrathin walls; water oxidation; acidic media
Citation Formats
Zhu, Jiawei, Chen, Zitao, Xie, Minghao, Lyu, Zhiheng, Chi, Miaofang, Mavrikakis, Manos, Jin, Wanqin, and Xia, Younan. Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium. United States: N. p., 2019.
Web. doi:10.1002/anie.201901732.
Zhu, Jiawei, Chen, Zitao, Xie, Minghao, Lyu, Zhiheng, Chi, Miaofang, Mavrikakis, Manos, Jin, Wanqin, & Xia, Younan. Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium. United States. https://doi.org/10.1002/anie.201901732
Zhu, Jiawei, Chen, Zitao, Xie, Minghao, Lyu, Zhiheng, Chi, Miaofang, Mavrikakis, Manos, Jin, Wanqin, and Xia, Younan. Fri .
"Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium". United States. https://doi.org/10.1002/anie.201901732. https://www.osti.gov/servlets/purl/1571237.
@article{osti_1571237,
title = {Iridium-Based Cubic Nanocages with 1.1-nm-Thick Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium},
author = {Zhu, Jiawei and Chen, Zitao and Xie, Minghao and Lyu, Zhiheng and Chi, Miaofang and Mavrikakis, Manos and Jin, Wanqin and Xia, Younan},
abstractNote = {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-2geo at a loading of Ir as low as 12.5 μgIr 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-1Ir) and specific (3.93 mA·cm-2Ir) 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 IrOx.},
doi = {10.1002/anie.201901732},
journal = {Angewandte Chemie (International Edition)},
number = 22,
volume = 58,
place = {United States},
year = {Fri Mar 08 00:00:00 EST 2019},
month = {Fri Mar 08 00:00:00 EST 2019}
}
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