世博娱乐

个人简介 

Laboratory of Organic Electronics,

Linköping University, Sweden

E-mail: [email protected]

Dan Zhao is an Associate professor in the Laboratory of Organic Electronics (LOE) at Linköping University. She received BD in chemistry at Nankai University (China, 2008) and PhD in applied physics at Renmin University (China, 2013). Afterwards, she joined the group of Organic Energy Materials (led by Reverant Crispin) at LOE as a post-doctoral researcher, where she started the research path of ionic thermoelectrics. Dan Zhao is the receiver of different grants, including starting grant and research grant from Swedish Research Counsil, ÅForsk grants and STINT joint-China mobility grant. She recieved Docent degree (qualification for being PhD supervisor) in Applied Physics in 2022, and now her research direction is focused on energy harvesting related materials.

报告摘要

Ionic thermoelectric materials can generate large thermal voltages under temperature gradients while also being low-cost and environmentally friendly. Many electrolytes with large Seebeck coefficients have been reported in recent years, however, the mechanism of the thermal voltage has not been well understood. In this talk, we will start with introducing ionic thermoelectric materials and devices, followed by presenting our new discoveries of other facts that affect the measured thermal potential in ionic thermoelectric materials. 1) In thin film ionic thermoelectric devices, the absorbed water from atmosphere could greatly affect the apparent Seebeck coefficient. 2) The charge density and type (positive or negative) introduces additional potential to the device under temperature difference. 3) For sealed/bulky electrolytes, the Seebeck coefficient is related to the molar conductivity.

In the last part, other activities including ionic related thermal sensing, piezoelectrics will be shortly discussed.

References:

1.    Dan Zhao, et.al, Ionic thermoelectric materials and devices, Journal of Energy Chemistry, 61, 2021, 88.

2.    Dan Zhao, et.al, The role of absorbed water in ionic liquid cellulosic electrolytes for ionic thermoelectrics, Journal of Material Chemistry C, 2022, 10, 2732-2741.  

3.    Ayesha Sultana, et.al, The Origin of Thermal Gradient-Induced Voltage in Polyelectrolytes, Small, 2023, 2308102

4.    Saeed Mardi, et.al, The Interfacial Effect on the Open Circuit Voltage of Ionic Thermoelectric Devices with Conducting Polymer Electrodes, Advanced Electronic Materials, 2021, 2100506

5.    Ayesha Sultana, et.al, Ionic Thermoelectric Ratchet Effect in Polymeric Electrolytes, J. Mater. Chem. C, 2022, DOI: 10.1039/D2TC01130A.

6.    Mina Shiran Chaharsoughi, et.al, Thermodiffusion assisted pyroelectrics—enabling rapid and stable heat and radiation sensing, Advanced Functional Materials, 2019, 29, 1900572.

7.    Mina Shiran Chaharsoughi, et.al, Ultrasensitive Electrolyte-Assisted Temperature Sensor, npj Flexible Electronics 2020, 4, 23.

8.    Mingna Liao, et.al, Cellulose-Based Radiative Cooling and Solar Heating Powers Ionic Thermoelectrics, Advanced Sicence, 2023, DOI: 10.1002/advs.202206510

9.    Ayesha Sultana, et.al, Towards high performance green piezoelectric generators based on

electrochemically poled nanocellulose. Chemistry of Materials, 2023, DOI: 10.1021/acs.chemmater.2c03020.