Highly dispersed palladium nanoparticles generated in situ on layered double hydroxide nanowalls for ultrasensitive electrochemical detection of hydrazine,Analytical Methods

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Highly dispersed palladium nanoparticles generated in situ on layered double hydroxide nanowalls for ultrasensitive electrochemical detection of hydrazine
Analytical Methods ( IF 2.7 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7ay02324c
Liang Xu _{1,

2,

3,

4} , Zongkai Qu _{1,

2,

3,

4} , Jun Chen _{1,

2,

3,

4} , Xu Chen _{1,

2,

3,

4} , Feng Li _{1,

2,

3,

4} , Wensheng Yang _{1,

2,

3,

4}

Affiliation

Rational design and fabrication of electrocatalytic nanomaterials is an effective approach for improving the sensitivity and stability of electrochemical sensors. Here, we report a novel CoAl-layered double hydroxide nanowall-supported Pd nanoparticle (PdNP/CoAl-LDHNW) composite as an electrochemical sensing platform for highly sensitive and durable detection of hydrazine. CoAl-LDHNWs, composed of vertical and interconnected two-dimensional LDH nanosheets, were synthesized on the surface of indium tin oxide (ITO) electrodes via a hydrothermal method. Next, highly dispersed PdNPs (∼2.4 nm) were anchored on the surface of CoAl-LDHNWs through a facile in situ reduction reaction between the PdCl₄²⁻ in solution and Co²⁺ in the support. The resultant PdNP/CoAl-LDHNW-modified ITO electrode exhibited excellent electrocatalytic activity for the electrochemical oxidation of hydrazine in a neutral solution. The electrochemical sensor showed a linear dynamic range of 0.1 to 655 μM with a low detection limit of 10 nM at −0.1 V; these values are superior to those of most previously reported PdNP-based composite-modified electrodes. The outstanding electroanalytical performance is mainly attributed to sufficient exposure of active sites due to the fine dispersion and clean surfaces of small size PdNPs on three-dimensional CoAl-LDHNWs. Additionally, the sensor exhibited good stability. In our perception, this sensor represents a valuable tool for advanced sensing of hydrazine.

中文翻译：

在层状双氢氧化物纳米壁上原位生成的高度分散的钯纳米粒子，用于肼的超灵敏电化学检测

合理设计和制造电催化纳米材料是提高电化学传感器灵敏度和稳定性的有效途径。在这里，我们报告了一种新型的CoAl层状双氢氧化物纳米壁支撑的Pd纳米颗粒（PdNP / CoAl-LDHNW）复合材料，作为电化学传感平台，可对肼进行高度灵敏和持久的检测。通过水热法在铟锡氧化物（ITO）电极的表面上合成了由垂直且相互连接的二维LDH纳米片组成的CoAl-LDHNWs 。接下来，通过溶液中的PdCl ₄^2-和Co ²⁺之间的简便原位还原反应，将高度分散的PdNP（〜2.4 nm）固定在CoAl-LDHNWs的表面上在支持中。所得的PdNP / CoAl-LDHNW改性的ITO电极在中性溶液中对肼的电化学氧化表现出优异的电催化活性。电化学传感器的线性动态范围为0.1至655μM，在-0.1 V时的检测极限低至10 nM。这些值优于大多数以前报道的基于PdNP的复合修饰电极的值。出色的电分析性能主要归因于在三维CoAl-LDHNW上小尺寸PdNP的精细分散和清洁表面，从而使活性位点充分暴露。另外，该传感器表现出良好的稳定性。在我们看来，该传感器代表了先进的肼传感技术。

更新日期：2017-11-22

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