电化学调控层状锂过渡金属氧化物以改善析氧反应。
Electrochemical tuning of layered lithium transition metal oxides for improvement of oxygen evolution reaction.
机构信息
1] Department of Material Science and Engineering, Stanford University, Stanford, California 94305, USA [2] State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China [3].
1] Department of Applied Physics, Stanford University, Stanford, California 94305, USA [2].
出版信息
Nat Commun. 2014 Jul 4;5:4345. doi: 10.1038/ncomms5345.
Searching for low-cost and efficient catalysts for the oxygen evolution reaction has been actively pursued owing to its importance in clean energy generation and storage. While developing new catalysts is important, tuning the electronic structure of existing catalysts over a wide electrochemical potential range can also offer a new direction. Here we demonstrate a method for electrochemical lithium tuning of catalytic materials in organic electrolyte for subsequent enhancement of the catalytic activity in aqueous solution. By continuously extracting lithium ions out of LiCoO2, a popular cathode material in lithium ion batteries, to Li0.5CoO2 in organic electrolyte, the catalytic activity is significantly improved. This enhancement is ascribed to the unique electronic structure after the delithiation process. The general efficacy of this methodology is demonstrated in several mixed metal oxides with similar improvements. The electrochemically delithiated LiCo0.33Ni0.33Fe0.33O2 exhibits a notable performance, better than the benchmark iridium/carbon catalyst.
由于在清洁能源的产生和存储中具有重要作用，因此一直在积极寻找低成本、高效率的氧气析出反应催化剂。虽然开发新型催化剂很重要，但在较宽的电化学电位范围内调整现有催化剂的电子结构也能提供一个新的方向。在这里，我们展示了一种在有机电解液中对催化材料进行电化学锂调谐的方法，以在水溶液中随后提高催化活性。通过不断从锂离子电池中常用的正极材料 LiCoO2 中提取锂离子，使其在有机电解液中变成 Li0.5CoO2，从而显著提高了催化活性。这种增强归因于脱锂过程后的独特电子结构。该方法在几种具有类似改进的混合金属氧化物中的普遍效果得到了证明。电化学脱锂的 LiCo0.33Ni0.33Fe0.33O2 表现出显著的性能，优于基准的铱/碳催化剂。
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