NiB nanoparticles: A new nickel-based catalyst for hydrogen storage properties of MgH2
NiB nanoparticles: A new nickel-based catalyst for hydrogen storage properties of MgH2
复制标题
NiB 纳米粒子：一种新型镍基催化剂，用于 MgH2 的储氢性能
DOI：
10.1016/j.ijhydene.2012.07.106
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发表时间：
2012-11-01
影响因子：
7.2
通讯作者：
Yuan, Huatang
中科院分区：
文献类型：
--
作者：
Liu, Guang;Qiu, Fangyuan;Yuan, Huatang
本文采用化学还原法制备了非晶态NiB纳米粒子，研究了NiB纳米粒子对氢氧化镁放氢性能的影响。程序升温脱附系统(TPD)和体积压力-组成等温线(PCI)的测试表明，添加10wt%的非晶态NiB后，脱附温度和脱附动力学均得到改善。例如，氢氧化镁-10wt%NiB混合物在180℃时开始释放氢，而对于纯的氢氧化镁，它必须加热到300℃才能释放氢气。此外，在300℃下，10wt%NiB混合物在10min内脱氢容量达到6.0wt%，而在相同条件下，即使经过120min，纯MgH2也只脱附2.0wt%的氢气。由脱附数据得到的活化能为59.7kJ/mol，这可能是由于添加剂降低了势垒，降低了形核驱动力，从而提高了反应动力学。用高压差示扫描量热法(HP-DSC)进一步研究了该复合材料的循环动力学，结果表明该复合材料具有良好的循环稳定性。版权所有(C)2012，氢能出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
In this paper, amorphous NiB nanoparticles were fabricated by chemical reduction method and the effect of NiB nanoparticles on hydrogen desorption properties of MgH2 was investigated. Measurements using temperature-programmed desorption system (TPD) and volumetric pressure-composition isotherm (PCI) revealed that both the desorption temperature and desorption kinetics have been improved by adding 10 wt% amorphous NiB. For example, the MgH2-10 wt%NiB mixture started to release hydrogen at 180 degrees C, whereas it had to heat up to 300 degrees C to release hydrogen for the pure MgH2. In addition, a hydrogen desorption capacity of 6.0wt% was reached within 10 min at 300 degrees C for the MgH2 10 wt%NiB mixture, in contrast, even after 120 min only 2.0 wt% hydrogen was desorbed for pure MgH2 under the same conditions. An activation energy of 59.7 kJ/mol for the MgH2/NiB composite has been obtained from the desorption data, which exhibits an enhanced kinetics possibly due to the additives reduced the barrier and lowered the driving forces for nucleation. Further cyclic kinetics investigation using high-pressure differential scanning calorimetry technique (HP-DSC) indicated that the composite had good cycle stability. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.