Self-Supported Cobalt Phosphide Mesoporous Nanorod Arrays: A Flexible and Bifunctional Electrode for Highly Active Electrocatalytic Water Reduction and Oxidation

Water splitting for the production of hydrogen and oxygen is an appealing solution to advance many sustainable and renewable energy conversion and storage systems, while the key fact depends on the innovative exploration regarding the design of efficient electrocatalysts. Reported herein is the grow...

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Vydáno v:Advanced functional materials Ročník 25; číslo 47; s. 7337 - 7347
Hlavní autoři: Zhu, Yun-Pei, Liu, Yu-Ping, Ren, Tie-Zhen, Yuan, Zhong-Yong
Médium: Journal Article
Jazyk:angličtina
Vydáno: Blackwell Publishing Ltd 16.12.2015
Témata:
Arrays
cobalt phosphide
Current density
Electrodes
Evolution
mesoporosity
nanorod array
Nanostructure
Renewable energy
self-supporting
Specific surface
Strategy
water electrolysis
ISSN:1616-301X, 1616-3028
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Shrnutí:Water splitting for the production of hydrogen and oxygen is an appealing solution to advance many sustainable and renewable energy conversion and storage systems, while the key fact depends on the innovative exploration regarding the design of efficient electrocatalysts. Reported herein is the growth of CoP mesoporous nanorod arrays on conductive Ni foam through an electrodeposition strategy. The resulting material of well‐defined mesoporosity and a high specific surface area (148 m2 g−1) can be directly employed as a bifunctional and flexible working electrode for both hydrogen and oxygen evolution reactions, showing superior activities as compared with noble metal benchmarks and state‐of‐the‐art transition‐metal‐based catalysts. This is intimately related to the unique nanorod array electrode configuration, leading to excellent electric interconnection and improved mass transport. A further step is taken toward an alkaline electrolyzer that can achieve a current density of 10 mA cm−2 at a voltage around 1.62 V over a long‐term operation, better than the combination of Pt and IrO2. This development is suggested to be readily extended to obtain other electrocatalysis systems for scale‐up water‐splitting technology. Flexible, bifunctional electrodes with self‐supported CoP mesoporous nanorod arrays are fabricated through an electrodeposition strategy. The electrodes possess well‐structured mesoporosity and a high specific surface area, exhibiting high activities toward both electrochemical hydrogen and oxygen evolution reactions. In a further step, an alkaline electrolyzer with a current density of 10 mA cm−2 at 1.62 V in a long‐term operation is realized.
Bibliografie:ArticleID:ADFM201503666
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201503666