Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 875, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160063
Keywords
Carbon shell-copper oxide nanorods; Copper oxide nanorods; Dopamine-derived carbon; Supercapacitor; Glucose sensor; Electrochemical studies
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Funding
- Ministry of Science and Technology of Taiwan, ROC [MOST 107-2113-M-027-0 05 MY3]
- International Institute for CarbonNeutral Energy Research (WPI-I2CNER) - World Premier International Research Center Initiative (WPI) , MEXT, Japan
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Nanolayers of carbon shell protected nanorods-like copper oxide materials were prepared and used as bifunctional electrode materials for supercapacitor and non-enzymatic glucose bio-sensing, showing high specific capacitance and excellent sensitivity values. The presence of carbon shell was crucial for the enhanced electrochemical activity.
Nanolayers of carbon shell protected nanorods-like copper oxide (CuO-NC) material were prepared via a simple chemical synthesis method. A small molecule compound such as dopamine (DA) was used as carbon precursors. The prepared nanostructured materials were characterized by various techniques and used as bifunctional electrode materials for supercapacitor and non-enzymatic glucose bio-sensing. The electrochemical performance suggested that bifunctional CuO-NC materials provided a high specific capacitance of 247 F g(-1) at a current density of 2.5 A g(-1). Remarkably, the specific capacitance increased as a function of cycle numbers, and a maximum capacitance of 364 F g(-1) was reached and sustained. Furthermore, the glucose-sensing performance was investigated and an excellent sensitivity value of 272.6 mu A mM(-1) cm(-2) was achieved with a low limit of detection (0.14 nM). These excellent activities are mainly attributed to the presence of carbon shell, which acted as high active sites and enhanced electronic conductive paths for CuO-NC. The carbon shell also provided fast electron-transportation and effective protection of the nanorod structures under harsh redox condition, leading to excellent electrochemical activity. (C) 2021 Elsevier B.V. All rights reserved.
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