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

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

来源：Angewandte Chemie - International Edition, 2021, 60(45): 24054-24058.

DOI：10.1002/anie.202110653

• Fe(OH)(2) oxidation
• hydrogen production
• low-temperature serpentinization
• nickel
• water reduction

Natural hydrogen (H-2) has gained considerable attentions as a renewable energy resource to mitigate the globally increasing environmental concerns. Low-temperature serpentinization (<200 degrees 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 Ni2+ could largely enhance the H-2 production kinetics. With the addition of only 1 % Ni2+, the H-2 production rate was remarkably enhanced by about two orders of magnitude at 90 degrees C. D2O isotopic experiment and theoretical calculations revealed that the enhanced H-2 production kinetics could be attributed to the catalytic role of Ni2+ to promote the reduction of H2O.

• 单位
  北京大学; 中国科学院