Synthesis and hydrolysis of NaZn(BH4)(3) and its ammoniates

标题

Synthesis and hydrolysis of NaZn(BH4)(3) and its ammoniates

作者

作者:Wang, MC (Wang, Meichun)^[1 ]; Ouyang, LZ (Ouyang, Liuzhang)^[1,2 ]; Peng, CH (Peng, Chenghong)^[1 ]; Zhu, XK (Zhu, Xiaoke)^[1 ]; Zhu, WH (Zhu, Weiheng)^[1 ]; Shao, HY (Shao, Huaiyu)^[3 ]; Zhu, M (Zhu, Min)^[1 ]

期刊信息

摘要

The synthesis and hydrolysis performance of NaZn(BH4)(3) and its ammoniates were investigated in this paper. The successful synthesis of NaZn(BH4)(3) and its ammoniates was confirmed by X-ray diffractometry and Fourier transform infrared spectroscopy measurements. The hydrolysis results show that NaZn(BH4)(3) is able to generate 1740 mL g(-1) hydrogen in 5 min and 1956 mL g(-1) hydrogen in 30 min without concomitant release of undesirable gases such as ammonia or boranes. This rate can be too fast to be controllable in some hydrogen generation cases. In addition, it is found that NaZn(BH4)(3)center dot 2NH(3) generates 118 mL g(-1) hydrogen in 5 min and 992 mL g(-1) hydrogen in 2 h, accompanied by an emission of a small amount of ammonia. Furthermore, an enhanced hydrolysis performance can be achieved by formation of NaZn(BH4)(3)/NaZn(BH4)(3)center dot 2NH(3) composites. These composites synthesized via a planetary ball milling technique may generate hydrogen with a very reasonable and controllable speed of 717 mL g(-1) hydrogen in 5 min and 1643 mL g(-1) hydrogen in 2 h. The activation energies for the hydrolysis in deionized water of NaZn(BH4)(3), NaZn(BH4)(3)center dot 2NH(3) and the NaZn(BH4)(3)/NaZn(BH4)(3)center dot 2NH(3) composite milled for 30 min were calculated to be 11.9 kJ mol(-1), 56.9 kJ mol(-1) and 32.5 kJ mol(-1), respectively. These results demonstrate that the catalyst-free NaZn(BH4)(3) and its ammoniates show better hydrolysis kinetics than other NaBH4 based materials and have the potential to be used as solid hydrogen generation materials.

关键词

KeyWords Plus:REVERSIBLE HYDROGEN STORAGE; METAL BOROHYDRIDES; ALUMINUM BOROHYDRIDE; ENERGY EFFICIENCY; COMPLEX HYDRIDES; GENERATION; DEHYDROGENATION; NABH4; MAGNESIUM; REGENERATION

作者信息

作者信息

通讯作者地址:Ouyang, LZ (通讯作者)

South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

通讯作者地址:Ouyang, LZ (通讯作者)

Key Lab Fuel Cell Technol Guangdong Prov, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China.

通讯作者地址:Shao, HY (通讯作者)

Univ Macau, IAPME, Taipa, Macau, Peoples R China.   增强组织信息的名称     University of Macau

地址:

	[ 1 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] Key Lab Fuel Cell Technol Guangdong Prov, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China
	[ 3 ] Univ Macau, IAPME, Taipa, Macau, Peoples R China   增强组织信息的名称     University of Macau

电子邮件地址:meouyang@scut.edu.cn; hshao@umac.mo

出版商

ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

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