Enhancement of hydrogenation kinetics and thermodynamic properties of ZrCo1-xCrx (x= 0-0.1) alloys for hydrogen storage

doi:10.1088/1674-1056/ab9289

Abstract The vacuum arc melting method was used to prepare ZrCo_1-xCr_x (x=0, 0.025, 0.05, 0.075, 0.1) alloys. Afterward, the crystal structure, hydrogenation kinetics, thermodynamic properties, and disproportionation performance of ZrCo_1-xCr_x (x=0-0.1) alloys were investigated. The x-ray diffraction spectra demonstrated that ZrCo_1-xCr_x (x=0-0.1) alloys contained ZrCo and ZrCo₂ phases, and their corresponding hydrides consisted of ZrCoH₃ and ZrH phases. The activation behaviors of Cr-substituted samples were significantly promoted. The activation time of ZrCo was 7715 s while that of ZrCo_0.9Cr_0.1 was 195 s. The improvement of kinetics can be attributed to the catalytic hydrogenation of ZrCr₂. The activation energy for the hydrogenation of ZrCo was 44.88-kJ·mol^-1 H₂ and decreased to 40.34-kJ·mol^-1 H₂ for ZrCo_0.95Cr_0.05. The plateau pressure and width of the pressure-composition-temperature curves decreased slightly as Cr content increased. The extent of disproportionation of ZrCo was 83.68% after being insulated at 798 K for 10 h and decreased slightly to 70.52% for ZrCo_0.9Cr_0.1. The improvement of anti-disproportionation performance can be attributed to increase in the activation energy of disproportionation from 167.46-kJ·mol^-1 H₂ for ZrCo to 168.28-kJ·mol^-1 H₂ for ZrCo_0.95Cr_0.05.

Keywords: hydrogen storage ZrCo Cr substitution anti-disproportionation performance activation behaviors

Received: 08 February 2020
Revised: 25 April 2020
Accepted manuscript online:

PACS:	88.30.R-	(Hydrogen storage)
	89.30.Jj	(Nuclear fusion power)
	81.05.Bx	(Metals, semimetals, and alloys)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 21573200, 2017YFE0301505, 21601165, 21401173, 21573200, and 51731002).

Corresponding Authors: Ge Sang
E-mail: anglesg@163.com

Cite this article:

Linling Luo(罗林龄), Xiaoqiu Ye(叶小球), Guanghui Zhang(张光辉), Huaqin Kou(寇化秦), Renjin Xiong(熊仁金), Ge Sang(桑革), Ronghai Yu(于荣海), Dongliang Zhao(赵栋梁) Enhancement of hydrogenation kinetics and thermodynamic properties of ZrCo_1-xCr_x (x= 0-0.1) alloys for hydrogen storage 2020 Chin. Phys. B 29 088801

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Enhancement of hydrogenation kinetics and thermodynamic properties of ZrCo1-xCrx (x= 0-0.1) alloys for hydrogen storage

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Enhancement of hydrogenation kinetics and thermodynamic properties of ZrCo_1-xCr_x (x= 0-0.1) alloys for hydrogen storage