Realizing Hydrogen De/Absorption Under Low Temperature for MgH2 by Doping Mn-Based Catalysts

Sun, Ze; Zhang, Liuting; Yan, Nianhua; Zheng, Jiaguang; Bian, Ting; Yang, Zongming; Su, Shichuan

doi:10.3390/nano10091745

Open AccessArticle

Realizing Hydrogen De/Absorption Under Low Temperature for MgH₂ by Doping Mn-Based Catalysts

by

Ze Sun

,

Liuting Zhang

^*,

Nianhua Yan

,

Jiaguang Zheng

,

Ting Bian

,

Zongming Yang

and

Shichuan Su

^*

College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China

^*

Authors to whom correspondence should be addressed.

Nanomaterials 2020, 10(9), 1745; https://doi.org/10.3390/nano10091745

Submission received: 6 August 2020 / Revised: 31 August 2020 / Accepted: 1 September 2020 / Published: 3 September 2020

(This article belongs to the Section Energy and Catalysis)

Download

Browse Figures

Review Reports Versions Notes

Abstract

Magnesium hydride (MgH₂) has been considered as a potential material for storing hydrogen, but its practical application is still hindered by the kinetic and thermodynamic obstacles. Herein, Mn-based catalysts (MnCl₂ and Mn) are adopted and doped into MgH₂ to improve its hydrogen storage performance. The onset dehydrogenation temperatures of MnCl₂ and submicron-Mn-doped MgH₂ are reduced to 225 °C and 183 °C, while the un-doped MgH₂ starts to release hydrogen at 315 °C. Further study reveals that 10 wt% of Mn is the better doping amount and the MgH₂ + 10 wt% submicron-Mn composite can quickly release 6.6 wt% hydrogen in 8 min at 300 °C. For hydrogenation, the completely dehydrogenated composite starts to absorb hydrogen even at room temperature and almost 3.0 wt% H₂ can be rehydrogenated in 30 min under 3 MPa hydrogen at 100 °C. Additionally, the activation energy of hydrogenation reaction for the modified MgH₂ composite significantly decreases to 17.3 ± 0.4 kJ/mol, which is much lower than that of the primitive MgH₂. Furthermore, the submicron-Mn-doped sample presents favorable cycling stability in 20 cycles, providing a good reference for designing and constructing efficient solid-state hydrogen storage systems for future application.

Keywords: hydrogen storage; MgH₂; Mn-based catalysts; catalytic effect; reversibility

Share and Cite

MDPI and ACS Style

Sun, Z.; Zhang, L.; Yan, N.; Zheng, J.; Bian, T.; Yang, Z.; Su, S. Realizing Hydrogen De/Absorption Under Low Temperature for MgH₂ by Doping Mn-Based Catalysts. Nanomaterials 2020, 10, 1745. https://doi.org/10.3390/nano10091745

AMA Style

Sun Z, Zhang L, Yan N, Zheng J, Bian T, Yang Z, Su S. Realizing Hydrogen De/Absorption Under Low Temperature for MgH₂ by Doping Mn-Based Catalysts. Nanomaterials. 2020; 10(9):1745. https://doi.org/10.3390/nano10091745

Chicago/Turabian Style

Sun, Ze, Liuting Zhang, Nianhua Yan, Jiaguang Zheng, Ting Bian, Zongming Yang, and Shichuan Su. 2020. "Realizing Hydrogen De/Absorption Under Low Temperature for MgH₂ by Doping Mn-Based Catalysts" Nanomaterials 10, no. 9: 1745. https://doi.org/10.3390/nano10091745

APA Style

Sun, Z., Zhang, L., Yan, N., Zheng, J., Bian, T., Yang, Z., & Su, S. (2020). Realizing Hydrogen De/Absorption Under Low Temperature for MgH₂ by Doping Mn-Based Catalysts. Nanomaterials, 10(9), 1745. https://doi.org/10.3390/nano10091745

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Menu

Realizing Hydrogen De/Absorption Under Low Temperature for MgH₂ by Doping Mn-Based Catalysts

Abstract

Share and Cite

Article Metrics

Article Access Statistics

Further Information

Guidelines

MDPI Initiatives

Follow MDPI