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Superior overall water splitting electrocatalysis in acidic conditions enabled by bimetallic Ir-Ag nanotubes

Zhu, Meiwu, Shao, Qi, Qian, Yong, Huang, Xiaoqing·2019·Nano Energy

Abstract

Abstract The development of efficient bifunctional electrocatalysts for overall water splitting in acidic condition is of importance for polymer electrolyte membrane (PEM) electrolyzers, but full of challenges. Herein, we report the successful creation of a class of hollow iridium (Ir)-silver (Ag) nanotubes (NTs) via a facile selective etching approach. Because of the unique properties of hollow structure and enriched oxidized Ir on the surface, the optimized Ir6Ag9 NTs show low oxygen evolution reaction overpotentials of 285 mV and 296 mV at 10 mA/cm2 in 0.5 M and 0.05 M H2SO4, respectively, being superior to the commercial Ir/C. The Ir6Ag9 NTs also exhibit lower hydrogen evolution reaction overpotentials (only 20 mV and 34 mV at 10 mA/cm2 in 0.5 M and 0.05 M H2SO4, respectively). More significantly, the Ir6Ag9 NTs/C can be further applied as bifunctional electrocatalysts with very low cell voltage of only 1.55 V at 10 mA/cm2 in 0.5 M H2SO4 as well as excellent durability with very small activity loss after 1000 cycles, holding much potential in the practical application in proton exchange membrane water electrolyzer.

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Metadata

Authors
Zhu, M., Shao, Q., Qian, Y., & Huang, X.
Venue
Nano Energy
Publisher
Elsevier BV
Published
2019-02
Volume
56
Pages
330-337
ISSN
2211-2855 (ISSN-L)
OpenAlex
W2901266579
Cited by
160
References
5
FWCI
4.13
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Superior overall water splitting electrocatalysis in acidic conditions enabled by bimetallic Ir-Ag nanotubes. https://app.cochat.ai/papers/10.1016/j.nanoen.2018.11.023
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Zhu, M., Shao, Q., Qian, Y., & Huang, X. (2019). Superior overall water splitting electrocatalysis in acidic conditions enabled by bimetallic Ir-Ag nanotubes. Nano Energy. https://doi.org/10.1016/j.nanoen.2018.11.023

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