The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH<sub>2</sub>

Liuting Zhang; Haijie Yu; Zhiyu Lu; Changhao Zhao; Jiaguang Zheng; Tao Wei; Fuying Wu; Beibei Xiao

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The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH₂

Updated：2026-01-06

- The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH₂
- Chinese Journal of Chemical Engineering Vol. 43, Issue 3, Pages: 343-352(2022)
- Affiliations：
  
  1. School of Energy and Power, Jiangsu University of Science and Technology,Zhenjiang,China,212003
  2. Analysis and Testing Center, Jiangsu University of Science and Technology,Zhenjiang,China,212003
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2022
- Accepted：
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[J]. 中国化学工程学报, 2022, 43(3): 343-352.
DOI：

[J]. 中国化学工程学报, 2022, 43(3): 343-352. DOI：

摘要

Abstract

High hydrogen desorption temperature and sluggish reaction kinetics are the major limitations for the practical application of MgH

. In this study

Co particles with a face centered cubic (FCC) structure and a hexagonal close packed (HCP) structure were prepared facilely and proved to be good catalysts for magnesium hydride. Co particles with FCC structure presented better catalytic effect on MgH

than that with HCP structure. Both 7% (mass) Co FCC and HCP particle modified MgH

decreased the initial dehydrogenation temperature from 301.3 ℃ to approximately 195.0 ℃

but 7% (mass) Co with FCC structure modified MgH

has a faster desorption rate

and around 6.5% (mass) H

was desorbed in 10 min at 325 ℃. Hydrogen uptake was detected at 70 ℃ under 3.25 MPa hydrogen pressure and 6.0% (mass) H

was recharged in 40 min at 150 ℃. The hydrogen desorption and absorption activation energy for 7% (mass) FCC Co modified MgH

was significantly decreased to (76.6±8.3) kJ·mol

-1

and (68.3±6.0) kJ·mol

-1

respectively. Thermodynamic property was also studied

the plateau pressures of MgH

+ 7% (mass) FCC Co were determined to be 0.14

0.28

0.53 and 0.98 MPa for 300 ℃

325 ℃

350 ℃ and 375℃. The decomposition enthalpy of hydrogen (Δ

) for MgH

+ 7% (mass) FCC Co was (80.6±0.1) kJ·mol

-1

5.8 kJ·mol

-1

lower than that of

as-prepared MgH

. Moreover

cycling performance for the first 20 cycles revealed that the reaction kinetics and capacity of MgH

-FCC Co composite remained almost unchanged. The result of density functional theory calculation demonstrated that cobalt could extract the Mg—H bond and reduced the decompose energy of magnesium hydride. Our paper can be presented as a reference for searching highly effective catalysts for hydrogen storage and other energy-related research fields.

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⁰

The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH2

DOI：

摘要

Abstract

关键词

Keywords

references

The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH₂