Zugl.: Bonn, Univ., Diss.

Zugl.: Bonn, Univ., Diss., 2009

Thesis (Ph. D.)--Technische Universität, Berlin. / Includes bibliographical references (p. [217]-240).

On‐chip micro‐supercapacitors (MSCs), as promising power candidates for microdevices, typically exhibit high power density, large charge/discharge rates, and long cycling lifetimes. However, as for most reported MSCs, the unsatisfactory areal energy density (<10 µWh cm−2) still hinders their practical applications. Herein, a new‐type Zn‐ion hybrid MSC with ultrahigh areal energy density and long‐term durability is demonstrated. Benefiting from fast ion adsorption/desorption on the capacitor‐type activated‐carbon cathode and reversible Zn stripping/plating on the battery‐type electrodeposited Zn‐nanosheet anode, the fabricated Zn‐ion hybrid MSCs exhibit remarkable areal capacitance of 1297 mF cm−2 at 0.16 mA cm−2 (259.4 F g−1 at a current density of 0.05 A g−1), landmark areal energy density (115.4 µWh cm−2 at 0.16 mW cm−2), and a superb cycling stability without noticeable decay after 10 000 cycles. This work will inspire the fabrication and development of new high‐performance microenergy devices based on novel device design.

We present a theory that addresses the question of why autocracies with a regime legitimation which ties the destiny of the members of the ruling elite, namely the nobility or ideocratic elite, to the survival of the autocracy, namely (ruling) monarchies and communist ideocracies, are more durable than other kinds of autocracies. Using logistic regression analysis and event history analysis on a dataset on autocratic regimes in the period 1946 to 2009, we are able to show that ruling monarchies and communist ideocracies are indeed the most durable autocratic regime types.