Redox Cycling Driven Transformation of Layered Manganese Oxides to Tunnel Structures,Journal of the American Chemical Society

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Redox Cycling Driven Transformation of Layered Manganese Oxides to Tunnel Structures
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-01-08 , DOI: 10.1021/jacs.9b12266
Haesung Jung , Martial Taillefert , Jingying Sun ₁ , Qian Wang , Olaf J Borkiewicz ₂ , Pan Liu , Lufeng Yang , Shuo Chen ₁ , Hailong Chen , Yuanzhi Tang

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Mn oxides are among the most ubiquitous minerals on Earth and play critical roles in numerous elemental cycles in biotic/abiotic loops as the key redox center. Yet it has long puzzled geochemists why the laboratory synthesis of todorokite, a tunnel structured Mn oxide, is extremely difficult while it is the dominant form over other tunneled phases in low temperature natural environments. This study employs a novel electrochemical method to mimic the cyclic redox reactions occurring over long geological timescales in accelerated manner. The results revealed that the kinetics and electron flux of the cyclic redox reaction are key to the layer-to-tunnel structure transformation of Mn oxides, provided new insights for natural biotic and abiotic redox reactions and explained the dominance of todorokite in nature.

中文翻译：

氧化还原循环驱动层状锰氧化物向隧道结构的转变

锰氧化物是地球上最普遍的矿物质之一，作为关键的氧化还原中心，在生物/非生物循环的众多元素循环中发挥着关键作用。然而长期以来，地球化学家一直困惑为什么在低温自然环境中，在实验室合成一种隧道结构的锰氧化物 todorokite 是极其困难的，而它是其他隧道相的主要形式。这项研究采用了一种新的电化学方法来模拟在长地质时间尺度上以加速方式发生的循环氧化还原反应。结果表明，循环氧化还原反应的动力学和电子通量是 Mn 氧化物层到隧道结构转变的关键，为天然生物和非生物氧化还原反应提供了新的见解，并解释了 todorokite 在自然界中的主导地位。

更新日期：2020-01-08

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