Welcome to Yuan Group @ Stockholm University

Functional Polymers and Carbons: from fundamentals to applied materials

Financial support by

Open PhD position till Nov. 5., 2019

Project title: synthesis and materials applications of conjugated polyimidazoliums.

This project deals with the synthesis and materials application of conjugated polyimidazoliums. Polyimidazoliums are a class of functional polymers. They have been recently explored intensively for their applications in energy, sensing, separation, etc. This project will focus on a special group of polyimidazolium polymers, which have a conjugated main chain. This type of polymers is supposed to be both ion- and electron-conductive. We expect that they can be used as sensors (CO2, etc.) and active components in photochemical or electrochemical devices (battery). The successful candidate should have a background in polymer chemistry, materials chemistry, physical chemistry or a related subject.(application weblink beneath)

https://www.su.se/english/about/working-at-su/phd?rmpage=job&rmjob=10314&rmlang=UK .

Research

Our mission is to design, create and investigate broadly defined functional polymers and carbons in a colloidal or porous form via simple chemistry and processing to confront materials challenges for a better and sustainable society. The team deals with both fundamentals in polymer science / carbon research, and the forefront challenges in materials science and engineering. Our current focus:

1. poly(ionic liquid) chemistry for better materials.

Currently, one of our focuses is the synthesis and materials application of poly(ionic liquid)s, a class of multifunctional polymers that are produced from polymerizable ionic liquids. These polymers carry a traditional profile of polymers and simultaneously maintain some distinctive properties of ionic liquids, therefore representing a new concept to build up task-specific functional polymers. Our activities on this topic cover new polymer structures and properties, the colloidal particle systems, porous polymers and their membranes, and responsive materials.

2. biopolymer-dervied functional materials

Being immersed in Stockholm University's sustainability atmosphere, our group is constantly strengthening its research activities on biopolymer-derived functional materials and devices. From nature cotton and seasand to man-made clothes and filter papers, we have introudced several new methods and concepts to produce and process materials.

3. heteroatom-doped porous carbons

Recently, our interest in polymer-derived hetero-atom-doped porous carbons with well-defined shape for energy, environment and sustainability applications grows thicker and turns into our new research strength. Their distinctive shapes includes (nano)particles, hollow nanospheres ("nanobubbles"), forms, fibers, and membranes.

Highlights

Via controlled vacuum pyrolysis of our poly(ionic liquid) membrane template, advantageous features including good conductivity (132 S cm-1 at 298 K), interconnected hierarchical pores, large specific surface area (1501 m2 g-1), and heteroatom doping are realized in a single carbon membrane electrode. The structure synergy at multiple length scales enables large areal capacitances both for a basic aqueous electrolyte (3.1 F cm-2) and for a symmetric all-solid-state supercapacitor (1.0 F cm-2), together with superior energy densities (1.72 and 0.14 mW h cm-2, respectively) without employing a current collector. It is our collaboration work with Qiang Zhao at Huazhong University of Science and Technology, China! ACS Nano., 2019! DOI: 10.1021/acsnano.9b03514 .

Poly(ionic liquid)-derived N-doped porous carbon membranes can stabilize atomically dispersed selenium at a high content of 5.9 wt%, and serves as high-performance electrode for Hydrazine Fuel Cell. It is our collaboration work with Hong Wang at Nankai University! Angew. Chem. Int. Ed., 2019! DOI: 10.1002/ange.201907752.

Poly(ionic liquid) nanoparticles can selectively disrupt biomembranes! Our collaboration work with Rumiana and Markus at the Max Planck Institute of Colloids and Interfaces, Germany, hits Advanced Science! DOI: 10.1002/advs.201801602.

We could micropattern nanoporous poly(ionci liquid) membranes into complexed shapes! ACS Nano,2019, DOI: 10.1021/acsnano.8b07069. It comes from a joint project between MPI-CI Germany and Hongkong Polytech University. Good job, Ming-Jie, Qiang, Jushuai and Karo!

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