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Layered and two dimensional metal oxides for electrochemical energy conversion
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2018-10-17 00:00:00 , DOI: 10.1039/c8ee02495b
Michelle P. Browne 1, 2, 3, 4, 5 , Zdeněk Sofer 1, 2, 3, 4, 5 , Martin Pumera 1, 2, 3, 4, 5
Affiliation  

The oxygen evolution and reduction reactions are two extremely important reactions in terms of energy applications. Currently, the Oxygen Evolution Reaction (OER) hinders the efficient running of electrolyzer devices which convert water into molecular H2. This H2 can subsequently be used in a H2/O2 fuel cell for the renewable generation of electricity with only H2O as a by-product. However, this fuel cell process is not economy feasible due to the sluggish kinetics of the Oxygen Reduction Reaction (ORR) at the device cathode, even with expensive state-of-the-art electrocatalytic materials. As of late, the amount of interest in the OER and ORR, from research laboratories from all over the globe, has risen rapidly in order to find cheap and efficient catalysts to replace the expensive platinum based catalysts currently used in the two aforementioned energy conversion/generation technologies. Layered transition metal oxides, based on the cheap transition metal oxides Mn, Co, Ni and Fe have been reported as viable catalysts for the OER and ORR. Layered structures have an added advantage over non-layered materials as the surface area can be increase by means of exfoliation, with potential for tailoring electrocatalytic activity. It has been shown that the fabrication process and post-synthetic treatments, e.g. anion exchange or exfoliation, of these materials can alter the catalytic activity of these materials. Here we summarise various fabrication methods and modifications utilised in literature to tailor the performance of layered transition metal and hydroxide based catalysts for the ORR and OER toward that of the state-of-the-art materials for these technologies.

中文翻译:

用于电化学能转换的层状和二维金属氧化物

就能量应用而言,氧的释放和还原反应是两个极其重要的反应。当前,放氧反应(OER)阻碍了将水转化为分子H 2的电解装置的有效运行。该H 2随后可以在H 2 / O 2燃料电池中用于仅H 2的可再生发电O为副产物。然而,由于在设备阴极处的氧还原反应(ORR)的动力学缓慢,即使使用昂贵的最先进的电催化材料,该燃料电池工艺也不经济。最近,来自全球各地的研究实验室对OER和ORR的兴趣迅速上升,以便找到廉价,高效的催化剂来代替目前在上述两种能量转换/中使用的昂贵的铂基催化剂。发电技术。据报道,基于廉价的过渡金属氧化物Mn,Co,Ni和Fe的层状过渡金属氧化物是OER和ORR的可行催化剂。分层结构比非分层材料具有更多的优势,因为可以通过剥落来增加表面积,具有调整电催化活性的潜力。已经表明,制造过程和后合成处理,这些材料的例如阴离子交换或剥落可改变这些材料的催化活性。在这里,我们总结了各种制造方法和文献中使用的各种修改方法,以针对ORR和OER调整层状过渡金属和氢氧化物基催化剂的性能,使其适应这些技术的最新材料的性能。
更新日期:2018-10-17
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