摘要
“双碳”目标背景下,氢能作为清洁低碳能源具有可持续、可循环、零排放、无污染特点,备受广泛关注。在固态储氢材料中氢化镁因其优异的储氢性能,成为质子交换膜燃料电池的理想水解原料。但氢化镁在纯水中反应速率极低,不同温度下1 min的水解率均在20%以下,10 min的水解率基本也在30%以下,为解决其水解制氢中反应速率和效率等问题,研究了以硫酸铁作为催化剂的催化效果与反应机理,并结合下游连续供氢装置供氢需求开展连续放氢实验。结果表明,在0.7 mol·L^(-1)的硫酸铁溶液中氢化镁1 min水解率达到75.41%,10 min后水解率达到98.36%,反应机理表明,Fe^(3+)优先结合OH-抑制了Mg(OH)_(2)形成,同时SO_(4)^(2+)强大的溶解效果改变了表面形貌结构,增加了放氢通道。这一试验为未来固体储氢材料应用于氢燃料电池汽车等大功率用电器奠定了坚实的研究基础。
The“dual carbon”goal has led to increased attention on hydrogen energy,which is a clean,low-carbon and sustainable energy source that produces zero emissions.MgH_(2) is an ideal material for solid-state hydrogen storage due to its excellent hydrogen storage performance.However,its hydrolysis reaction rate in pure water is lowless than 20% in the first minute and below 30%after ten minutes.The efficiency of hydrogen production through hydrolysis needs improvement.To improve reaction efficiency,we investigated the catalytic effects and mechanism of ferric sulfate.Continuous dehydrogenation experiments were conducted,revealed that a 0.7 mol·L^(-1) ferric sulfate solution achieved hydrolysis efficiency of 75.41% after one minute and 98.36%after ten minutes.The mechanism showed that Fe^(3+) binds with OH-to inhibit Mg(OH)_(2) formation,while SO_(4)^(2-) enhances surface morphology,facilitating hydrogen release.This research lays the groundwork for using solid hydrogen storage materials in high-power electrical devices like hydrogen fuel cell vehicles.
作者
胡启明
HU Qiming(Jiaxing Light Alloy Engineering Technology Centers,Chinese Academy of Sciences,Jiaxing 314051,Zhejiang,China;Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《工业催化》
2025年第1期58-63,共6页
Industrial Catalysis
基金
中国科学院科技服务网络计划(STS计划)项目(KFJ-STS-OYZX-105)。
