Steel-Based Electrocatalysts for Efficient and Durable Oxygen Evolution in Acidic Media
| Autor: | Karsten Küpper, Ulrich Krupp, Joachim Wollschläger, Peilong Hou, Diemo Daum, Klaus Müller-Buschbaum, Helmut Schäfer, Xiaogang Liu, Mercedes Schmidt, Johannes Stangl, Christine Schulz-Kölbel, Martin Steinhart, Weijia Han |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Chemical Physics (physics.chem-ph)
Materials science Electrolysis of water Alloy Oxygen evolution FOS: Physical sciences 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 7. Clean energy Catalysis 0104 chemical sciences 3. Good health Anode Chemical engineering Physics - Chemical Physics Linear sweep voltammetry engineering Water splitting 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | Catalysis Science & Technology |
| Popis: | High overpotentials, particularly an issue of common anode materials, hamper the process of water electrolysis for clean energy generation. Thanks to immense research efforts up to date oxygen evolution electrocatalysts based on earth-abundant elements work efficiently and stably in neutral and alkaline regimes. However, non-noble metal-based anode materials that can withstand low pH regimes are considered to be an indispensable prerequisite for the water splitting to succeed in the future. All oxygen evolving electrodes working durably and actively in acids contain Ir at least as an additive. Due to its scarcity and high acquisition costs noble elements like Pt, Ru and Ir need to be replaced by earth abundant elements. We have evaluated a Ni containing stainless steel for use as an oxygen-forming electrode in diluted H2SO4. Unmodified Ni42 steel showed a significant weight loss after long term OER polarization experiments. Moreover, a substantial loss of the OER performance of the untreated steel specimen seen in linear sweep voltammetry measurements turned out to be a serious issue. However, upon anodization in LiOH, Ni42 alloy was rendered in OER electrocatalysts that exhibit under optimized synthesis conditions stable overpotentials down to 445 mV for 10 mA cm-2 current density at pH 0. Even more important: The resulting material has proven to be robust upon long-term usage (weight loss: 20 mug/mm2 after 50 ks of chronopotentiometry at pH 1) towards OER in H2SO4. Our results suggest that electrochemical oxidation of Ni42 steel in LiOH (sample Ni42Li205) results in the formation of a metal oxide containing outer zone that supports solution route-based oxygen evolution in acidic regime accompanied by a good stability of the catalyst. arXiv admin note: text overlap with arXiv:1712.01100 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|