Facile synthesis of Co/Pd supported by few-walled carbon nanotubes as an efficient bidirectional catalyst for improving the low temperature hydrogen storage properties of magnesium hydride

Abstract

Catalytic doping is important for enhancing the hydrogen storage performance of metal hydrides, but it is challenging to develop a single catalyst to enhance both hydrogen desorption and absorption to a certain degree.

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

“…With regard to the nanoscaling, various catalysts for improving the hydrogen storage properties of MgH 2 have been investigated, such as transition metals/metal oxides/halogenides (Ma et al, 2009(Ma et al, , 2013Cui et al, 2014;Rizo-Acosta et al, 2018;Zhang et al, 2018;Liu et al, 2019b), rare earth metal oxides/halogenides (Singh et al, 2013;Lin et al, 2014Lin et al, , 2015Wang et al, 2015), carbon materials (Lukashev et al, 2006;Liu et al, 2013;Rather et al, 2016), and other hydrides (Lu et al, 2010;Terent'ev et al, 2015;Jangir et al, 2018). In addition, some noble metals, such as Pd, have been reported to be effective for facilitating hydrogenation of MgH 2 (Du et al, 2007;Callini et al, 2010;Ham et al, 2013;Chung et al, 2015;Liu et al, 2019a). Liu et al (2019a) reported that elemental Pd played a dominant role in accelerating the preferential diffusion of hydrogen atoms at the Pd/Mg interface, during the hydrogenation process.…”

“…In addition, some noble metals, such as Pd, have been reported to be effective for facilitating hydrogenation of MgH 2 (Du et al, 2007;Callini et al, 2010;Ham et al, 2013;Chung et al, 2015;Liu et al, 2019a). Liu et al (2019a) reported that elemental Pd played a dominant role in accelerating the preferential diffusion of hydrogen atoms at the Pd/Mg interface, during the hydrogenation process. Callini et al (2009) suggested the occurrence of Mg-alloying as a path for subsequent feasible H-exchange, when Pd was deposited on top of a thick MgO layer surrounding the Mg NPs core.…”

Constructing Core-Shell Co@N-Rich Carbon Additives Toward Enhanced Hydrogen Storage Performance of Magnesium Hydride

“…Several papers have demonstrated that using proper catalysts is more convenient for practical applications (Zhang et al, 2017Huang et al, 2018;Valentoni et al, 2018;Chen et al, 2019;Li B. et al, 2019;Hu et al, 2020). Among the catalyst additives, the prominent catalytic influences of Co metal on enhancing the hydrogen desorption properties of MgH 2 have been reported in previous literature (Mao et al, 2010;Novakovic et al, 2010;Verón et al, 2013;Liu et al, 2018Liu et al, , 2019a. Novakovic et al have reported that the higher number of d-electrons in Co metal has made it superior to Ti in destabilizing MgH 2 (Novakovic et al, 2010).…”

“…Liu et al have demonstrated that Co@CNTs nano-catalyst doped into MgH 2 played an essential role in improving its hydrogen storage properties (Liu et al, 2018). A novel bi-metallic Co/Pd@B-CNTs catalyst was also reported recently showing excellent catalytic effects of MgH 2 at low temperatures (Liu et al, 2019a). Based on literature, the mixture of Co metal and carbon material exhibits effectively catalytic function.…”

Recent advances in Mg-based hydrogen storage materials

“…(a) The preparation processes of Ni@Ti-MX; (b-c) the isothermal hydrogen absorption and desorption curves of MgH 2 /Ni@Ti-MX under different temperatures; (d) the schematic diagram of the multi-phase interfaces of MgH 2 /Ni@Ti-MX [62] . Copyright © 2020 American Chemical Society [63,64] 、 石墨 [65] 、 碳纳米管 [66] 、 活性炭和金属有机框架 (Metal organic framework， MOF)衍生多孔碳 [67,68] 等。 Wang 等人 [63] [64] 、 Lotoskyy [65] 、 Zhang [66] 等的研究工作也证明了 Fe 3 O 4 @石墨烯 (GS)、Ni@GS、 Ti-C 的少量添加可以显著增加 Mg 材料的循环稳定性能。 MOF 材料及其衍生物因能同步引入金属/碳基材料也是一类常用的复合催化剂。Ma 等人 [67] 发现， TM-MOF (TM=Ni、Fe、Co)材料可以改善 Mg 基材料的吸放氢性能。Zhang [68] 和 Wang [69] 等人由 MIL-125(Ti)…”