報(bào)告時(shí)間：2019年5月7日（周二）9:30-10:30
報(bào)告地點(diǎn)：北辰校區(qū)材料樓517
報(bào)告題目: High-Resolution Visualization of the Redox Activity of Li2O2 in Non-Aqueous Media: Conformal Layer VS. Toroid Structure
報(bào)告內(nèi)容: A strong relationship between the surface structure and the redox activity of the Li2O2 is visualized directly using a scanning electrochemical cell microscopy, byemploying a dual-barrel nanopipette containing a unique gel polymer electrolyte. These measurements reveal considerable local heterogeneity with significantly enhanced electrochemical activity at toroidal Li2O2 structures when compared to the conformal layer that is usually formed on the cathode of Li–O2 batteries.
報(bào)告人簡(jiǎn)介：
Dr. Pei San E，女，英國(guó)華威大學(xué)制造工程系研究員。2017年畢業(yè)于英國(guó)華威大學(xué)，獲得理學(xué)博士學(xué)位。從2011年至今，先后在Fuji Electric公司擔(dān)任工程師、在英國(guó)劍橋大學(xué)任職副研究員、以及在英國(guó)華威大學(xué)擔(dān)任研究員等職務(wù)。迄今獲得過(guò)馬來(lái)西亞國(guó)家科研創(chuàng)新獎(jiǎng)、英國(guó)創(chuàng)新展金獎(jiǎng)、英國(guó)最佳創(chuàng)新獎(jiǎng)、馬來(lái)西亞可持續(xù)發(fā)展創(chuàng)新獎(jiǎng)等獎(jiǎng)項(xiàng)。目前主要從事于基礎(chǔ)電化學(xué)、納米電化學(xué)、生物電化學(xué)、氣體傳感器以及鋰離子電池等方面的研究工作，且在國(guó)際著名期刊包括ACS Applied Mater. Inter.,ElectrochimicaActa, J. Phys. Chem. C, PCCP等國(guó)際期刊上發(fā)表SCI論文多篇，并20余次被邀請(qǐng)?jiān)趪?guó)際重要會(huì)議做學(xué)術(shù)報(bào)告。
報(bào)告時(shí)間：2019年5月7日（周二）10:30-11:30
報(bào)告地點(diǎn)：北辰校區(qū)材料樓517
報(bào)告題目: Non-Aqueous Electrodeposition of Functional Materials
報(bào)告內(nèi)容: Thermoelectric materials are of interest for converting waste heat to electricity and could be useful in applications such as power generation. Currently bulk bismuth telluride (Bi2Te3) is the most commonly used materials for refrigeration and waste heat recovery. However, theoretical calculation predicts that the performance can be dramatically improved by confining the dimensions of this material.
Electrodeposition provides a bottom-up technique compared to conventional coating methods, such as physical vapor deposition (PVD). It is of advantage in the efficient use of the starting material and can be used to plate curved surfaces and even inside of topologically demanding surfaces. The use of electrodeposition to fill nano-structures is also achievable, which is exploited in the Damascene process to grow 20 nm diameter Cu wires.
In electrochemical experiments water is the most commonly used solvent but its limitation includes narrow potential window, which is crucial in electrodeposition as water reduction will be a competing process as for metal reduction/deposition and provides introduces complexity to experiments. Here we employ an electrolyte system based on tetrabutylammoniumchlorometallate metal sources with compatible tetraalkyl halide supporting electrolytes in non-aqueous, weakly coordinating solvents, which provides the ability to deposit alloys with desired structures and properties.
In this work we report the deposition of Bi2Te3 films from dichloromethane. Bi2Te3 is a narrow band gap layered semi-conductor and it is demonstrated that the composition and structure of the BiTefilms can be controlled by tuning the electrochemical parameters, such as the electrolyte concentration and deposition potential.
報(bào)告人簡(jiǎn)介：
孟令聰，男，英國(guó)南安普頓大學(xué)化學(xué)系研究員。2010和2012年在中南大學(xué)材料學(xué)院獲得學(xué)士和碩士學(xué)位，2016年在英國(guó)華威大學(xué)獲得理學(xué)博士學(xué)位。2016至今分別在英國(guó)華威大學(xué)從事博士后研究員和英國(guó)南安普頓大學(xué)擔(dān)任研究員職務(wù)。其目前主要從事于基礎(chǔ)電化學(xué)、高溫高壓電化學(xué)、電沉積功能材料等領(lǐng)域的研究工作。在國(guó)際知名期刊，如ACS Nano、J. Phys. Chem. C、Faraday Discussions等上發(fā)表十余篇代表性論文。
