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Leveraging Grain Size Effects on Hydrogen Generated via Doped Aluminum–Water Reactions Enabled by a Liquid Metal
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-18 , DOI: 10.1021/acsaem.0c02175 Laureen Meroueh 1 , Lance Neil 1 , Thomas W. Eagar 2 , Douglas P. Hart 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-18 , DOI: 10.1021/acsaem.0c02175 Laureen Meroueh 1 , Lance Neil 1 , Thomas W. Eagar 2 , Douglas P. Hart 1
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Through the aluminum–water reaction, hydrogen is densely stored and generated on-demand. To enable the reaction, we harness eutectic gallium–indium which permeates through aluminum’s grain boundaries, disrupting aluminum’s oxide layer and inhibiting further passivation of the aluminum grain surfaces. We find that, in addition to doping, grain refining and grain coarsening offer a latitude in engineering aluminum microstructures to tune hydrogen generation rates and reaction efficiency. In Mg-doped, Mg2Si-doped, and pure aluminum, reducing the grain size from an as-cast structure to around 30 μm increases the rate of hydrogen flux by an order of magnitude. Mild silicon doping at 0.6 wt % significantly increases the reaction rate in which the same grain size reduction increases hydrogen flux rates by two orders of magnitude. Additionally, the byproduct of the aluminum–water reaction varies with both doping and grain size. Results of combined grain size and doping effects on hydrogen evolution rates allow for further exploration into the underlying reaction mechanism in the presence of a liquid metal.
中文翻译：
利用液态金属对铝-水反应产生的氢对晶粒尺寸的影响
通过铝与水的反应，氢被密集地储存并按需产生。为了进行反应，我们利用共晶镓-铟渗透铝的晶界，破坏铝的氧化物层并抑制铝颗粒表面的进一步钝化。我们发现，除了掺杂之外，晶粒细化和晶粒粗化还为工程铝微结构提供了自由度，以调节氢的产生速率和反应效率。掺镁2掺Si的纯铝将晶粒尺寸从铸态结构减小到大约30μm，可使氢通量的速率提高一个数量级。轻掺杂0.6 wt％的硅会显着提高反应速率，其中相同的粒度减小会使氢通量速率增加两个数量级。此外，铝与水反应的副产物随掺杂和晶粒尺寸的不同而变化。晶粒尺寸和掺杂对氢释放速率的综合影响的结果允许在液态金属存在下进一步探索潜在的反应机理。
更新日期：2021-01-25
中文翻译：
利用液态金属对铝-水反应产生的氢对晶粒尺寸的影响
通过铝与水的反应，氢被密集地储存并按需产生。为了进行反应，我们利用共晶镓-铟渗透铝的晶界，破坏铝的氧化物层并抑制铝颗粒表面的进一步钝化。我们发现，除了掺杂之外，晶粒细化和晶粒粗化还为工程铝微结构提供了自由度，以调节氢的产生速率和反应效率。掺镁2掺Si的纯铝将晶粒尺寸从铸态结构减小到大约30μm，可使氢通量的速率提高一个数量级。轻掺杂0.6 wt％的硅会显着提高反应速率，其中相同的粒度减小会使氢通量速率增加两个数量级。此外，铝与水反应的副产物随掺杂和晶粒尺寸的不同而变化。晶粒尺寸和掺杂对氢释放速率的综合影响的结果允许在液态金属存在下进一步探索潜在的反应机理。
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