小柯机器人

中南大学林璋团队报道了一个被忽视的天然析氢途径，即低温蛇纹石化过程中Ni²⁺促进Fe(OH)₂氧化还原H₂O。相关研究成果于2021年9月14日发表在《德国应用化学》。

天然氢（H₂）作为一种可再生能源，在缓解全球日益增长的环境问题方面受到了广泛关注。低温蛇纹石化（<200℃）是一种典型的水岩反应，是天然氢的主要来源。然而，天然H₂的反应机理和控制步骤尚不清楚，阻碍了天然H₂的进一步利用。

该文中，研究人员证明了在低温蛇纹石化过程中，可以通过Fe（OH）₂氧化来确定H2的生成速率。此外，Ni²⁺的共存可以大大提高H₂的生成动力学。当仅添加1%的Ni²⁺时，在90°C下，H₂生成率显著提高约两个数量级。D₂O同位素实验和理论计算表明，提高的H₂生成动力学可归因于Ni²⁺促进H₂O还原的催化作用。

附：英文原文

Title: An Overlooked Natural Hydrogen Evolution Pathway: Ni2+ Boosting H2O Reduction by Fe(OH)2 Oxidation during Low-temperature Serpentinization

Author: Han Song, Xinwen Ou, Bin Han, Haoyu Deng, Wenchao Zhang, Chen Tian, Chunfang Cai, Anhuai Lu, Zhang Lin, Liyuan Chai

Issue&Volume: 2021-09-14

Abstract: Natural hydrogen (H 2  ) has gained considerable attentions as a renewable energy resource to mitigate the globally increasing environmental concerns. Low-temperature serpentinization (< 200 °  C) as a typical water-rock reaction is a major source of the natural H 2  . However, the reaction mechanism and the controlling step to product H 2  remained unclear, which hinders the further utilization of natural H 2  . Herein, we demonstrated that the H 2  production rate could be determined by the Fe(OH) 2  oxidation during low-temperature serpentinization. Moreover, the co-existence of Ni 2+  could largely enhance the H 2  production kinetics. With the addition of only 1 % Ni 2+  , the H 2  production rate was remarkably enhanced by about two orders of magnitude at 90 °  C. D 2  O isotopic experiment and theoretical calculations revealed that the enhanced H 2  production kinetics could be attributed to the catalytic role of Ni 2+  to promote the reduction of H 2  O.

DOI: 10.1002/anie.202110653

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202110653