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Mechanisms of partial hydrogen sorption reversibility in a 3NaBH(4)/ScF3 composite

机译：3NABH（4）/ SCF3复合材料中部分氢吸收可逆性的机理

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摘要

A new hydrogen storage composite containing NaBH4 and a 3d transition metal fluoride, 3NaBH(4)/ScF3, was synthesized via ball milling. The composite shows no reaction during milling and its dehydriding process can be divided into three steps upon heating: (i) partial substitution of H- by F- in NaBH4 to form NaBHxF4-x at the early stage, releasing about 0.19 wt% of hydrogen; (ii) formations of Na3ScF6, NaBF4 and ScB2 through the reaction between NaBH4 and ScF3, with 2.52 wt% of hydrogen release and a dehydriding activation energy of 162.67 kJ mol(-1) H-2; (iii) further reaction of residual NaBH4 and Na3ScF6 to form NaF,B and ScB2, with a dehydriding activation energy of 169.37 kJ mol(-1) H-2. The total hydrogen release of the composite reaches 5.54 wt% at 530 degrees C. The complete dehydrided composite cannot be rehydrogenated while the products after the second dehydriding step can be hydrogenated with an absorption activation energy of 44.58 kJ mol(-1) H-2. These results demonstrate that by adding 3d transition metal fluorides into NaBH4, a partial reversibility in NaBH4 can be achieved.
机译：通过球磨合并含有NaBH 4和3D过渡金属氟化物，3nabH（4）/ SCF3的新的储氢复合材料。复合材料在研磨过程中显示不反应，并且其脱水过程可以在加热时分为三个步骤：（i）在奈赫4中的部分取代，在早期逐步形成NaBHXF4-X，释放约0.19wt％的氢气; （ii）Na3SCF6，NaBF4和SCB2的形成通过NaBH4和SCF3之间的反应，氢释放的2.52wt％，脱水活化能量为162.67kJ摩尔（-1）H-2; （iii）残留NaBH4和Na3SCF6的进一步反应形成NAF，B和SCB2，其脱水活化能量为169.37kJ摩尔（-1）H-2。复合材料的总氢释放在530℃下达到5.54wt％。在第二脱水步骤之后的产物可以氢化44.58kJ摩尔（-1）H-2的物品后，不能再氢化完整的脱水复合材料。 。这些结果表明，通过将3D过渡金属氟化物添加到NABH4中，可以实现NABH4中的部分可逆性。

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  • 来源
    《RSC Advances》 |2018年第17期|共7页
  • 作者

    Zhao Ning; Zou Jianxin; Zeng Xiaoqin; Ding Wenjiang;

  • 作者单位

    Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Natl Engn Res Ctr Light Alloy Net Forming Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Natl Engn Res Ctr Light Alloy Net Forming Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Natl Engn Res Ctr Light Alloy Net Forming Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Natl Engn Res Ctr Light Alloy Net Forming Shanghai 200240 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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