Nanosized rambutan-like nickel oxides as electrochemical sensor and pseudocapacitor
Nanosized rambutan-like nickel oxides as electrochemical sensor and pseudocapacitor
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DOI：
10.1016/j.snb.2013.11.113
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发表时间：
2014-03-01
影响因子：
8.4
通讯作者：
El-Safty, Sherif A.
中科院分区：
文献类型：
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作者：
Khairy, Mohamed;El-Safty, Sherif A.
具有先进性能的精细纳米级多孔设计的发展已经引起了相当大的兴趣，因为它们具有较大的表面积，不同孔长尺度上活性位点的分散和缩短的扩散路径，有利于电解质离子的快速迁移。多孔结构的这些特性直接关系到它们在能量和传感系统中的电化学性能。在目前的研究中，我们报告了通过微波辅助方法大规模生产、低成本制造和高纯度的具有rambutan样形貌（NRs）的NiO纳米结构产品。利用CV、恒流充放电和阻抗谱等电化学测量方法研究了NiO NRs电极的电化学性能。NiO NRs在恶劣环境中具有可靠的氢氧化物离子电化学传感器和高性能可回收伪电容器。NiO NRs的这种电化学性能与其独特的形貌、尺寸和孔径分布显著相关，从而增强了电解质在三维多孔网络中的扩散。这些关键因素导致了高比电容，在较宽的浓度范围内可靠地检测氢氧化物离子，检测限为22 μ M (pH 9.3)，灵敏度为13.9 × 10(-3) a /M。因此，这些发现证明了独立NiO NR电极在开发高性能电化学器件方面的潜力。(C) 2013 Elsevier B.V.版权所有
The development of meticulous nanoscale porous designs with advanced properties have been attracted considerable interest because of their large surface areas, dispersion of active sites at different pore length scales and shortened diffusion paths that facilitates the rapid migration of electrolyte ions. These features of porous structures have a direct link to their electrochemical performance in energy and sensing systems. In the current study we report large scale-up production, low-cost manufacturing, and high-purity product of NiO nano structures with rambutan-like morphology (NRs) via a microwave-assisted approach. The electrochemical measurements of CV, galvanostatic charge-discharge and the impedance spectrum were used to investigate the electrochemical performance of the NiO NRs electrodes. The NiO NRs exhibit a reliable electrochemical sensor for hydroxide ion in harsh environments and high-performance recyclable pesudocapacitor. This electrochemical performance of NiO NRs is significantly related to their unique morphology, size, and pore size distribution that enhance the diffusion of the electrolyte through the 3D porous network. These key factors induced high specific capacitance and reliably detect hydroxide ions within a wide concentration range, a detection limit of 22 mu M (pH 9.3), and high sensitivity of 13.9 x 10(-3) A/M. Therefore, such findings demonstrated the potential of free-standing NiO NR electrodes for developing high-performance electrochemical devices. (C) 2013 Elsevier B.V. All rights reserved.