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Issue 28, 2018
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In situ growth of single-layered α-Ni(OH)2 nanosheets on a carbon cloth for highly efficient electrocatalytic oxidation of urea

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Abstract

The electrochemical urea oxidation reaction (UOR) is useful for the simultaneous elimination of urea-rich wastewater and generation of hydrogen. In theory, nickel-based catalysts, as non-precious metal catalysts, show great advantages in this regard. However, poor conductivity and insufficient active sites on common nickel-based nanomaterials hinder their catalytic performance. Herein, we report methanol-directed one-step growth of single-layered (SL) α-Ni(OH)2 nanosheets on a conductive carbon cloth (CC) (SL α-Ni(OH)2 NS/CC) for highly efficient electrocatalytic urea oxidation. Without the use of any other pretreatment and modification methodology, it is found that huge SL α-Ni(OH)2 NS with a thickness of ∼0.8 nm densely and fully covers every CC fiber in the form of nanowalls. Taking advantage of the good conductivity of CC and the sufficiently exposed active surface of SL α-Ni(OH)2 NS, the resulting SL α-Ni(OH)2 NS/CC-integrated electrode displays superior UOR performance. A current density as high as 436.4 mA cm−2 at 0.5 V vs. Ag/AgCl is achieved, which represents the best UOR performance among those of the reported nickel-based electrocatalysts. This convenient approach opens a new way to obtain ultrafine heterogeneous catalysts and their integrated electrodes with the assistance of methanol solvent instead of water.

Graphical abstract: In situ growth of single-layered α-Ni(OH)2 nanosheets on a carbon cloth for highly efficient electrocatalytic oxidation of urea

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Supplementary files

Article information


Submitted
30 May 2018
Accepted
18 Jun 2018
First published
18 Jun 2018

J. Mater. Chem. A, 2018,6, 13867-13873
Article type
Paper

In situ growth of single-layered α-Ni(OH)2 nanosheets on a carbon cloth for highly efficient electrocatalytic oxidation of urea

C. Lin, Z. Gao, F. Zhang, J. Yang, B. Liu and J. Jin, J. Mater. Chem. A, 2018, 6, 13867
DOI: 10.1039/C8TA05064C

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