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.
, Fritz, K.
, Beaucage, P.
, , R.
, Yu, F.
, Disalvo, F.
, Suntivich, J.
and Wiesner, U.
Materials Combining Asymmetric Pore Structures with Well-Defined Mesoporosity for Energy Storage and Conversion, ACS Nano, [online], https://doi.org/10.1021/acsnano.0c05903, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928832
(Accessed August 5, 2021)