Guo Jie, Hou Yongjiang, Li Bo
School of Environmental Science and Engineering, Hebei University of Science and Technology Shi Jiazhuang 050018 China
RSC Adv. 2018 Jul 19;8(46):25873-25880. doi: 10.1039/c8ra03848a.
A hollow Ni-Fe-B nanochain is successfully synthesized by a galvanic replacement method using a Fe-B nanocomposite and a NiCl solution as the template and additional reagent, respectively. Both the concentration of Ni and the morphology of the resulting Ni-Fe-B alloy are controlled by varying the duration of the replacement process during the synthesis. The Ni-Fe-B sample synthesized for 60 min (Ni-Fe-B-60) shows the best catalytic activity at 313 K, with a hydrogen production rate of 4320 mL min g and an activation energy for the NaBH hydrolysis reaction of 33.7 kJ mol. The good performance of Ni-Fe-B-60 towards the hydrolysis of NaBH can be ascribed to both hollow nanochain structural and electronic effects. Furthermore, the effects of temperature, catalyst amount, and concentration of NaOH and NaBH on the hydrolysis process are systematically studied, and an overall kinetic rate equation is obtained. The hollow Ni-Fe-B nanochain catalyst also shows good reusability characteristics and maintained its initial activity after 5 consecutive cycles.
采用电置换法，分别以Fe-B纳米复合材料和NiCl溶液为模板和添加剂，成功合成了中空Ni-Fe-B纳米链。在合成过程中，通过改变置换过程的持续时间来控制所得Ni-Fe-B合金中Ni的浓度和形态。合成60分钟的Ni-Fe-B样品（Ni-Fe-B-60）在313K时表现出最佳催化活性，产氢速率为4320 mL min g，NaBH水解反应的活化能为33.7 kJ mol。Ni-Fe-B-60对NaBH水解的良好性能可归因于中空纳米链结构和电子效应。此外，系统研究了温度、催化剂用量以及NaOH和NaBH浓度对水解过程的影响，并得到了一个整体动力学速率方程。中空Ni-Fe-B纳米链催化剂还表现出良好的可重复使用特性，在连续5个循环后仍保持其初始活性。
