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Promotional effects of Ru and Fe on Ni/ZrO_(2) catalyst during CO_(2) methanation:A comparative evaluation of the mechanism

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Journal of Energy Chemistry 2023年第11期86卷 351-361,I0008页

作者： Jie Ren Feng Zeng Chalachew Mebrahtu Zhandong Wang regina palkovits Institute for Technical and Macromolecular Chemistry RWTH Aachen UniversityWorringerweg 252074 AachenGermany Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHeifei 230026AnhuiChina State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029AnhuiChina

Ni-based catalysts are widely investigated non-noble metal-based systems for CO_(2)***,their industrial application is still limited due to lower activity at low-temperature and catalyst *** a second metal such as Ru and Fe is considered as a successful strategy to overcome these challenges through alloy formation or the synergies provided by the interplay of two adjacent metallic ***,their promotional effect on the CO_(2)methanation mechanism under similar conditions has not been reported *** this work,Fe and Ru-promoted Ni/ZrO_(2)catalysts were investigated to evaluate their promotional effect on the *** Ni/Fe ratio was first optimized and a CO_(2)conversion rate of 37.7 mmolCO_(2)/(molNi+Fes)and 96.3%CH^(4)selectivity was obtained over the Ni_(0.8)Fe_(0.2)/ZrO_(2)*** comparison with Ni_(0.8)Fe_(0.2)/ZrO_(2),Ni_(0.8)Ru_(0.2)/ZrO_(2)prepared with the same composition showed higher activity and stability in CO_(2)*** results indicate alloys formation and H spillover for Ni_(0.8)Ru_(0.2)/ZrO_(2)to be responsible for ***,in situ DRIFTS studies evidenced the occurrence of both CO_(2)dissociative and associative pathways over Ni_(0.8)Ru_(0.2)/ZrO_(2)catalyst,while solely the CO_(2)associative pathway occurred for Ni_(0.8)Fe_(0.2)/ZrO_(2)

关键词： Ni-based catalyst Alloy formation H spillover CO_(2) methanation Methanation mechanism

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Stability and deactivation of OER electrocatalysts: A review

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Journal of Energy Chemistry 2022年第6期31卷 301-329,I0009页

作者： Feng Zeng Chalachew Mebrahtu Longfei Liao Anna Katharina Beine regina palkovits State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina Institute of Technical and Macromolecular Chemistry RWTH Aachen UniversityWorringerweg 252074 AachenGermany Max Planck Institute for Chemical Energy Conversion Stiftstraße.34–3645470 Mülheim an der RuhrGermany

Recently, H_(2) has attracted increasing attention as green energy carrier holding the possibility to replace fossil fuel-based energy sources and thereby reduce CO_(2) emissions. Green hydrogen can be generated by water electrolysis using renewable energies like wind and solar power. When it is combusted, only water forms as by-product. However, the efficiency of water electrolysis is hampered by the anodic oxygen evolution reaction(OER) because of the slow kinetics which leads to a high overpotential. Therefore, many catalysts have been developed for OER to facilitate the kinetics and reduce the overpotential. In addition to electrocatalytic activity, the stability of the catalysts is imperative for industrial application and has been intensively studied. In this review, we cover recent findings on the stability and deactivation mechanisms of OER catalysts. We discuss the correlation between OER activity and stability, methodologies and experimental techniques to study the stability and deactivation as well as the deactivation mechanisms, together with factors influencing stability. Furthermore, strategies for stabilizing and regenerating OER catalysts as well as methods to predict stability are summarized. Finally, the review highlights emerging methodologies yet to be explored and future directions of stability studies and the design of highly stable OER catalysts.

关键词： Oxygen evolution OER Stability Durability Deactivation

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