State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 130012, Changchun, China.
Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
Nat Commun. 2018 Jul 4;9(1):2609. doi: 10.1038/s41467-018-05019-5.
Although a number of nonprecious materials can exhibit catalytic activity approaching (sometimes even outperforming) that of iridium oxide catalysts for the oxygen evolution reaction, their catalytic lifetimes rarely exceed more than several hundred hours under operating conditions. Here we develop an energy-efficient, cost-effective, scaled-up corrosion engineering method for transforming inexpensive iron substrates (e.g., iron plate and iron foam) into highly active and ultrastable electrodes for oxygen evolution reaction. This synthetic method is achieved via a desired corrosion reaction of iron substrates with oxygen in aqueous solutions containing divalent cations (e.g., nickel) at ambient temperature. This process results in the growth on iron substrates of thin film nanosheet arrays that consist of iron-containing layered double hydroxides, instead of rust. This inexpensive and simple manufacturing technique affords iron-substrate-derived electrodes possessing excellent catalytic activities and activity retention for over 6000 hours at 1000 mA cm current densities.
尽管许多非贵金属材料在析氧反应中的催化活性可接近（有时甚至超过）氧化铱催化剂，但在工作条件下，它们的催化寿命很少超过数百小时。在这里，我们开发了一种节能、经济高效、可规模化的腐蚀工程方法，可将廉价的铁基体（例如铁板和铁泡沫）转化为用于析氧反应的高活性和超稳定电极。这种合成方法是通过在含有二价阳离子（例如镍）的水溶液中使铁基体与氧气发生所需的腐蚀反应，在环境温度下实现的。该过程导致在铁基体上生长出由含铁层状双氢氧化物组成的薄膜纳米片阵列，而不是铁锈。这种廉价且简单的制造技术可提供铁基体衍生的电极，其在 1000 mA cm 的电流密度下具有超过 6000 小时的优异催化活性和活性保持率。
