Mirshafiee Faezeh, Rezaei Mehran
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
Sci Rep. 2024 Sep 6;14(1):20818. doi: 10.1038/s41598-024-71501-4.
A series of M/NiCo-Ferrite (M: Pt, Pd, Ru, and Rh) nanoparticles were successfully synthesized, through a facile sol-gel auto-combustion followed by impregnation-reduction approach, as a catalyst for hydrogen generation from hydrolysis of NaBH. All synthesized samples were characterized by XRD, N adsorption-desorption method, ICP-OES, FE-SEM, and EDX analysis. Compared to the other samples, it was observed that the Rh/NiCo-Ferrite sample exhibited higher particle distribution and surface area. To evaluate the hydrogen generation rate, the hydrolysis was carried out at a temperature of 35 °C, with an aqueous solution containing 5 wt.% NaBH and 3 wt.% NaOH. The experimental findings indicate that the Rh/NiCo-Ferrite sample exhibited a superior rate of hydrogen generation, with an average value of 11,667 mL/min.g, compared to the other samples studied. Enhanced catalytic properties may be responsible for its high activity. In addition, the activation energy of hydrolysis of sodium borohydride over the Rh/NiCo-Ferrite sample was 54.5 kJ/mol which is lower than the activation energy of many Ferrite-based catalysts. Moreover, the re-usability test of the Rh/NiCo-Ferrite sample denoted a decline in the catalytic activity after 4 recycling experiments due to the alterations in morphology and the reduction in the quantity of active phase.
通过简便的溶胶 - 凝胶自燃法随后进行浸渍还原法，成功合成了一系列M/NiCo铁氧体（M：Pt、Pd、Ru和Rh）纳米颗粒，作为硼氢化钠水解制氢的催化剂。所有合成样品均通过XRD、N吸附 - 脱附法、ICP - OES、FE - SEM和EDX分析进行表征。与其他样品相比，观察到Rh/NiCo铁氧体样品表现出更高的颗粒分布和表面积。为了评估产氢速率，水解在35℃的温度下进行，使用含有5 wt.%硼氢化钠和3 wt.%氢氧化钠的水溶液。实验结果表明，与所研究的其他样品相比，Rh/NiCo铁氧体样品表现出优异的产氢速率，平均值为11667 mL/min.g。增强的催化性能可能是其高活性的原因。此外，硼氢化钠在Rh/NiCo铁氧体样品上水解的活化能为54.5 kJ/mol，低于许多铁氧体基催化剂的活化能。此外，Rh/NiCo铁氧体样品的可重复使用性测试表明，由于形态变化和活性相数量减少，在4次循环实验后催化活性下降。
