Kotkondawar Abhay Vijay, Rayalu Sadhana
Environmental Materials Division, CSIR-National Environmental Engineering Research Institute Nehru Marg Nagpur-440020 Maharashtra (M.S.) India
RSC Adv. 2020 Oct 16;10(63):38184-38195. doi: 10.1039/c9ra10742h. eCollection 2020 Oct 15.
The development of low-cost materials for the 100% dehydrogenation of metal hydrides is highly essential to vitalize the chemical hydride-based hydrogen economy. In this context, the ternary Co-Ce-Pt nanocomposite immobilized on functionalized catalytic support CGO is synthesized by the one step chemical reduction approach and has been directly employed for the ethanolysis of sodium borohydride. The co-operative effect of CGO and the synergy between metallic nanoparticles is investigated to determine the highest rate of hydrogen (H) production. The maximum hydrogen generation rate (HGR) of 41.53 L (min g ) is achieved with the CoPt/CeO /CGO nanohybrid from the alkaline ethanolysis of sodium borohydride (SB). In addition, the resultant nanohybrid exhibited a relatively low activation energy of 21.42 kJ mol for the ethanolysis of SB. This enhanced catalytic activity may be attributed to the intermetallic charge transport among metallic Pt, Co/CoO, and CeO counterparts. Moreover, the catalytic support CGO provides mesoporous functionalized surface and its intercalated GO layers promote charge transport. These results indicate that the resultant catalytic system described here for the dehydrogenation of SB can offer a portable and low-cost H supply for various fuel cell applications.
开发用于金属氢化物100%脱氢的低成本材料对于激活基于化学氢化物的氢能经济至关重要。在此背景下，通过一步化学还原法合成了固定在功能化催化载体CGO上的三元Co-Ce-Pt纳米复合材料，并将其直接用于硼氢化钠的乙醇解反应。研究了CGO的协同作用以及金属纳米颗粒之间的协同效应，以确定最高的氢气产生速率。CoPt/CeO₂/CGO纳米杂化物通过硼氢化钠（SB）的碱性乙醇解反应实现了41.53 L/（min·g）的最大产氢速率（HGR）。此外，所得纳米杂化物对SB乙醇解反应的活化能相对较低，为21.42 kJ/mol。这种增强的催化活性可能归因于金属Pt、Co/CoO和CeO₂之间的金属间电荷传输。此外，催化载体CGO提供了介孔功能化表面，其插入的氧化石墨烯（GO）层促进了电荷传输。这些结果表明，此处描述的用于SB脱氢的催化体系可为各种燃料电池应用提供便携且低成本的氢源。
