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MM: Fachverband Metall- und Materialphysik

MM 26: Materials for Energy Storage and Conversion

MM 26.8: Vortrag

Mittwoch, 3. April 2019, 17:00–17:15, H43

Rational surface engineering toward optimizing hydrogen evolution activity of nanoporous electrodes — •Long Liu, Huaping Zhao, Yang Xu, Chenglin Zhang, Yaoguo Fang, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

A rational surface engineering strategy for nanoporous electrodes is demonstrated to promote the hydrogen evolution (HER) process. Cobalt nanopore arrays (CoNPA) were fabricated as a reprenentive HER electrode and subsequently functionalized by a conformal ultrathin titanium dioxide (TiO2) with optimized thickness and thereafter a well-dispersed platinum (Pt) nanoparticles with an ultralow mass loading (ca. 54 μg cm-2) anchored on TiO2 layer. The advanced features of nanoporous architecture, the improved wettability by TiO2 layer, and the abundant reactive sites arising from well-dispersed Pt nanoparticles synergistically contribute to enhance the HER kinetics of CoNPA electrodes in alkaline conditions, and finally achieved low overpotential of 29 mV, small Tafel slope of 42 mV per decade as well as long-termed performance and structure stability. Not limited to the HER electrodes, the similar strategy is also expected to be further applied to design nanoelectrodes for other electrochemical energy conversion and storage devices.