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Volume 7 Biosensors Journal
ISSN: 2090-4967 Electrochemistry 2018
June 11-12, 2018
Page 70
conferenceseries.com
June 11-12, 2018 | Rome, Italy
4th International Conference on Electrochemistry
Joachim Maier, Biosens J 2018, Volume 7
DOI: 10.4172/2090-4967-C1-001
JoachimMaier
Max Planck Institute for Solid State Research, Germany
The connection between chemistry and electric function in solids
In loose terms chemistry is the chemistry of the perfect state (perfect crystallographic structure) plus chemistry of the excited state
(defect structure). The latter is responsible for the electric transport and storage properties. In aqueous solutions this function is
taken by H+ and OH- ions as well as dissolved ions. In solids this role is carried out by point defects such as excess (interstitials) and
lacking particles (vacancies). It is exactly the consideration of point defect chemistry which is necessary to understand and tune ionic
transport phenomena in solids hence forming the bridge between chemistry and electric function. This picture also comprises the
electronic transport enabled by excess electrons and electron holes. It is shown how the charge carrier chemistry can be understood,
analyzed and varied as a function of stoichiometry and doping not only in the bulk but also at interfaces. Of special interest are size
effects on the electronic and ionic carrier concentrations. These defect-chemical considerations directly translate into the electric
function in batteries, fuel cells and photo-electrochemical devices. This does not only hold at or near equilibrium, also the kinetic
performance depend on such issues. In addition to transport-related questions, the point defects are most relevant acid-base or
redox-active centers and are thus of central significance, not only for transport, but also for reaction kinetics and catalysis. A selection
of applied examples such as storage modes in batteries, reaction kinetics in fuel cells or transport effect in photo-perovskites will be
addressed.
Recent Publications
1. Maier J (2005) Nanoionics: ion transport and electrochemical storage in confined systems. Nature Materials 4:805–815.
2. Maier J (2013) Thermodynamics of electrochemical lithium storage. Angewandte Chemie International Edition 52:4998–
5026.
3. Chen C C, Fu L J and Maier J (2016) Synergistic, ultrafast mass storage and removal in artificial mixed conductors. Nature
536:159–164.
4. Zhu C, Usiskin R, Yu Y and Maier J (2017) The nanoscale circuitry of battery electrodes. Science DOI: 10.1126/science.
aao2808.
5. Yang T Y, Gregori G, Pellet N, Grätzel M and Maier J (2015) The significance of ion conduction in a hybrid organic–
inorganic lead-iodide-based perovskite photosensitizer. Angewandte Chemie International Edition 54:7905–7910.
Biography
Joachim Maier studied Chemistry at the University of Saarbrücken, received his PhD in 1982 from the same university and completed his Habilitation at the University
of Tübingen in 1988. He has lectured at the University of Tübingen, at Massachusetts Institute of Technology as a foreign Faculty Member, at the University of Graz as
a Visiting Professor, and at the University of Stuttgart as an Honorary Professor. He is Past President of the International Society of Solid State Ionics. As Director of the
Physical Chemistry Department (since 1991) of the Max Planck Institute for Solid State Research and Member of various national and international academies his concern
is the conceptual understanding of chemical and electrochemical phenomena involving solids as well as their use in materials science. He has been listed as one of the
most influential scientific minds (Thomson Reuters).