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首页> 外文期刊>RSC Advances >The effect of A-site doping in a strontium palladium perovskite and its applications for non-enzymatic glucose sensing
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The effect of A-site doping in a strontium palladium perovskite and its applications for non-enzymatic glucose sensing

机译：锶钙钛矿中A位掺杂的影响及其在非酶葡萄糖传感中的应用

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摘要

The catalytic activity of a strontium palladium perovskite, Sr2PdO3, toward non-enzymatic glucose sensing is strongly affected by the Sr2+ A-site partial substitution by Ca2+ ions; Sr2-xCaxPdO3 with x = 0-0.7. Scanning and transmission electronmicroscopies (SEM, EDAX and TEM), XRD, XPS, BET and a particle size analyzer were used to investigate themicrostructure, morphology, physical-chemical and electrochemical properties of the prepared perovskites. A good-crystalline orthorhombic Sr2PdO3 phase was formed as the main phase in all the prepared samples with particle sizes in the range of nanometers as confirmed by XRD. Doping the A-site Sr2+ cations with Ca2+ ions in the Sr2PdO3 perovskite leads to the enhancement of the elecrocatalytic activity towards non-enzymatic glucose sensing showing the highest elecrocatalytic activity in the case of Sr1.7Ca0.3PdO3. This may be attributed to the higher free volume in the crystal lattice, enhanced content and mobility of surface lattice oxygen and distorted stabilized perovskite structure leading to higher catalytic activity of the prepared perovskites. In addition, synergistic interactions were achieved between Sr2+ and Ca2+ in the A-site and Pd2+ ions in the B-site resulting in improved surface activity and a stabilized structure. As a result, greater ionic and electronic conductivity and enhanced catalytic activity were achieved upon doping. Graphite/Sr1.7Ca0.3PdO3 as a free enzymatic glucose sensor exhibited good stability, a low detection limit, high sensitivity, good selectivity even in the presence of common interferents, applicability in real sample analysis and anti-interference ability.
机译：钙钛酸锶锶Sr2PdO3对非酶促葡萄糖感应的催化活性受Ca2 +离子对Sr2 + A-位部分取代的强烈影响; X = 0-0.7的Sr2-xCaxPdO3。扫描和透射电镜（SEM，EDAX和TEM），XRD，XPS，BET和粒度分析仪用于研究所制备钙钛矿的微观结构，形态，物理化学和电化学性质。如X射线衍射所证实的，在所有制备的样品中形成了良好晶体的正交晶Sr2PdO3相作为主相。在Sr2PdO3钙钛矿中用Ca2 +离子掺杂A-位Sr2 +阳离子导致对非酶促葡萄糖感应的电催化活性增强，在Sr1.7Ca0.3PdO3的情况下显示出最高的电催化活性。这可能归因于晶格中较高的自由体积，表面晶格氧的含量和迁移率提高以及稳定的钙钛矿结构变形，从而导致所制备的钙钛矿具有较高的催化活性。此外，在A位的Sr2 +和Ca2 +和B位的Pd2 +离子之间实现了协同相互作用，从而改善了表面活性并形成了稳定的结构。结果，在掺杂时实现了更大的离子和电子导电性以及增强的催化活性。作为游离酶葡萄糖传感器的石墨/Sr1.7Ca0.3PdO3表现出良好的稳定性，低检测限，高灵敏度，即使在存在常见干扰物的情况下也具有良好的选择性，在实际样品分析中的适用性和抗干扰能力。

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