以316L不锈钢为基体的嵌入式预阳极化超薄碳糊电极同时测定多巴胺和酪氨酸

本文以316L不锈钢为基体,以简便快速的方法构建了嵌入式预阳极化超薄碳糊电极(316L-PAIUCPE).探究了多巴胺(DA)和酪氨酸(Tyr)在该电极上的电化学响应行为.详细讨论了酸度对DA和Tyr氧化峰电位和峰电流大小的影响.并且DA和Tyr的氧化峰电流与其浓度分别在8.0×10-7～8.0×104mol·L-1和...     

一维二元复式晶格的拓扑不变量与边缘态

在紧束缚近似下,系统地求解了一维二元复式晶格中电子的能量本征值问题,并且根据推广的布洛赫定理得到了有限晶格边缘态的解析表达式.边缘态可以普遍地存在于一维二元复式晶格中,并不仅仅局限于Su-Schrieffer-Heeger拓扑晶格.由于空间反演对称性破缺,Rice-Mele晶格是拓扑平庸的,但其边缘态对系统的非对角无序也是鲁棒的,缠绕数可以作为有限一维二元复式晶格存在边缘态的普遍判据.     

ICRF集体电子密度起伏的FIR激光散射

本文给出了在UCLA的Microtor装置上,用远红外(FIR)激光散射,对离子回旋共振频率范围(ICRF)的外驱动集体电子密度起伏的测量,并对这些结果进行了分析,发现实验结果直接与两种离子等离子体的快波模转换理论相符合。此外,也描述了本实验所用激光散射系统,简单地讨论了有待进一步探讨的问题。     

Accelerated oxygen evolution kinetics on Ir-doped SrTiO3 perovskite by NH3 plasma treatment

Exploring low-cost and high-performance catalysts for oxygen evolution reaction (OER) remains to be a great challenge. Iridium-based perovskite oxide has large potential in OER because of its intrinsic activity and outstanding physicochemical properties. In this study, iridium-doped strontium titanate (Ir-STO) solution is brushed on a Ti sheet by the traditional method to obtain the Ir-STO/Ti electrodes after being calcined at a high temperature. The microstructure and electrocatalysis properties of the Ir-STO are further modified by a facile and scalable NH₃-plasma strategy. In addition to the doping of Ir, the NH₃ plasma treatment further results in N-doping into Ir-STO, which enriches active species and causes oxygen vacancies near doped sites. The resulting N, Ir-STO/Ti electrode reveals excellent acidic OER activity with the lowest overpotential of 390 mV at 10 mA/cm² and the smallest Tafel slope of 140 mV/dec after 10-min plasma treatment. Therefore, the great potential of activated N, Ir-STO/Ti is regarded as a catalyst for the OER, and thus making a new opportunity for developing other perovskite catalysts via NH₃ plasma treatment.