氧化还原石墨烯基微流体发电机感应电势影响因素的研究  

Influence Factors on Induced Potential of Reduced Graphene Oxide-based Microfluidic Voltage Generations

作　　者：高伟卓 景蔚萱[1,2,3] 杜妍睿 李泽昊 韩枫 赵立波 杨朝初[2] 蒋庄德 GAO Weizhuo;JING Weixuan;DU Yanrui;LI Zehao;HAN Feng;ZHAO Libo;YANG Zhaochu;JIANG Zhuangde(State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction,Chongqing Technology and Business University,Chongqing 400067,China;Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Yantai 265503,China)

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049 [2]重庆工商大学微纳系统与智能传感重庆市重点实验室,重庆400067 [3]烟台先进材料与绿色制造山东省实验室,烟台265503

出　　处：《高等学校化学学报》2023年第8期129-140,共12页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51975466,51805426,81727802)资助.

摘　　要：采用不同浓度的分散液制备了氧化还原石墨烯基微流体发电机,测得了不同NaCl溶液流体流速时的感应电势.根据Nernst-Planck方程建立了工作电极表面扩散层内Na^(+)离子浓度与感应电势之间的量化关系.基于不同流体流速时所测得的感应电势值,分析了流体流速-Na^(+)离子物质输运及其吸附浓度-微流体发电机感应电势之间的影响关系.引入表面纹理纵横比(Str)和最大高度(Sz)等特征参数量化表征了氧化还原石墨烯薄膜的表面形貌,研究了分散液浓度-氧化还原石墨烯表面形貌-工作电极表面Na^(+)离子吸附量-微流体发电机感应电势之间的内在规律.当NaCl溶液流体流速为50μL/min、氧化还原石墨烯浓度为1 mg/mL时,微流体发电机感应电势可达−343 mV.研究结果不但有助于碳基微流体能量收集器工艺参数的优化及性能改进,还有利于与微流道相关的光降解器、离子敏传感器和电化学葡萄糖传感器等器件性能的提升.In this paper,reduced graphene oxide(rGO)-based microfluidic voltage generations were fabricated with the suspensions at different rGO concentration.Different values of the induced potential of these rGO-based microfluidic voltage generations were generated at various volume flow rate of NaCl solution.Based on Nernst-Planck equation the quantitative relationship between the Na^(+)ion concentration in the diffusion layer upon the surface of the working electrode and induced potential of the microfluidic voltage generation was established.With the values of induced potential corresponding to different volume flow rates of the NaCl solution,the effect of the volume flow rate on both mass transporting of Na^(+)ions from the solution upon the rGO membranes and the concentration of the Na^(+)ion adsorbed on the surface of working electrode,and further the induced potential of the rGO-based microfluidic voltage generation had been researched.Besides,by quantitatively characterizing the surface morphology of the rGO membrane with the surface texture aspect ratio(Str)and maxium height(Sz),the relationship among the rGO concentration of the suspension,the surface morphology of the rGO membrane,the concentration of the Na^(+)ion adsorbed on the surface of the working electrode and the induced potential of the microfluidic voltage generation had been established.At volume flow rate 50μL/min of the NaCl solution and rGO concentration 1.0 mg/mL of the suspen⁃sion the rGO-based microfluidic voltage generation can generate an optimal induced potential−343 mV.These results benefit not only the fabrication and performance optimizations of other carbon-based microfluidic voltage generations,but also the behavior improvements of the microfluidic channel based photo-degradation reactors,ion sensing devices and electrochemical glucose sensors.

关 键 词：微流体发电机 流体流速 表面形貌 离子浓度 感应电势 

分 类 号：O646.2[理学—物理化学] O653[理学—化学]