Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Materials Combining Asymmetric Pore Structures with Well-Defined Mesoporosity for Energy Storage and Conversion



Sarah Hesse, Kevin Fritz, Peter A. Beaucage, R. Paxton Thedford, Fei Yu, Francis Disalvo, Jin Suntivich, Ulrich Wiesner


Porous materials design often faces a trade-off between the requirements of high internal surface area and high reagent flux. Inorganic materials with asymmetric/hierarchical pore structures or well-defined mesopores have been tested to overcome this trade-off, but success has remained limited when the strategies are employed individually. Here, the attributes of both strategies are combined and a scalable path to porous titanium nitride (TiN) and carbon membranes that are conducting (TiN, carbon) or superconducting (TiN) is demonstrated. These materials exhibit a combination of asymmetric, hierarchical pore structures and well-defined mesoporosity throughout the material. Fast transport through such TiN materials as an electrochemical double-layer capacitor provides a substantial improvement in capacity retention at high scan rates, resulting in state-of-the-art power density (28.2 kW kg–1) at competitive energy density (7.3 W-h kg–1). In the case of carbon membranes, a record-setting power density (287.9 kW kg–1) at 14.5 W-h kg–1 is reported. Results suggest distinct advantages of such pore architectures for energy storage and conversion applications and provide an advanced avenue for addressing the trade-off between high-surface-area and high-flux requirements.
ACS Nano


Hesse, S. , Fritz, K. , Beaucage, P. , , R. , Yu, F. , Disalvo, F. , Suntivich, J. and Wiesner, U. (2020), Materials Combining Asymmetric Pore Structures with Well-Defined Mesoporosity for Energy Storage and Conversion, ACS Nano, [online],, (Accessed July 13, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created November 25, 2020, Updated May 24, 2021