1673-159X

CN 51-1686/N

Ni-CeO2纳米复合材料的制备及其催化肼硼烷产氢的性能分析

Preparation of Ni-CeO2 Nanocomposites and Performance Analysis of Catalyzing Hydrazine Borane to Produce Hydrogen

  • 摘要: 开发高效的非贵金属催化剂用于肼硼烷(N2H4BH3, HB)制氢是实现其作为燃料电池氢源的关键。本文通过共沉淀法在活性中心Ni周围引入可以分散和稳定金属纳米粒子的CeO2,生成非贵金属催化剂Ni-CeO2,其通过调节金属和载体之间的相互作用,实现从肼硼烷中高效产氢。实验结果表明:共沉淀法制备得到的Ni-CeO2相较于传统浸渍法制备得到的Ni/CeO2-IMP有更优异的催化活性;Ni-CeO2在323 K碱性条件下对肼硼烷产氢的TOF值为31.6 h–1,是Ni/CeO2-IMP的3.2倍;Ni-CeO2优异的催化活性归因于其更强的金属-载体相互作用(MSI),催化剂中存在更多的氧缺陷和碱性位点。通过本方法制备得到的Ni-MOx(M = Ce、La、Nd、Y、Mg、Zr和Al)可以很好地提升Ni对于肼硼烷产氢的活性以及氢气选择性,表明这种催化剂的合成策略具有普适性,有利于其在燃料电池中的实际应用。

     

    Abstract: The development of efficient noble-metal-free catalysts for the decomposition of hydrazine borane (N2H4BH3, HB) to produce hydrogen is the key to achieving its practical application as a hydrogen source for fuel cell. In this work, CeO2 was introduced around the active center Ni by co-precipitation method to disperse and stabilize metal nanoparticles, forming a Ni-CeO2 catalyst, which can achieve efficient hydrogen production from hydrazine borane by regulating the interaction between the metal and the support. The experimental results show that the catalyst prepared by coprecipitation method (Ni-CeO2) has better catalytic activity than that prepared by traditional impregnation method (Ni/CeO2-IMP). The TOF value of Ni-CeO2 catalyst for hydrogen production from N2H4BH3 at 323 K under alkaline condition is 31.6 h–1, which is 3.2 times that of Ni/CeO2-IMP catalyst. The excellent catalytic activity of Ni-CeO2 is attributed to its strong metal-support interaction (MSI) with much oxygen defects and basic sites in the catalyst. The Ni-MOx (M=Ce, La, Nd, Y, Mg, Zr and Al) prepared by this method can significantly improve the activity and hydrogen selectivity of Ni for hydrogen production from hydrazine borane, indicating that the synthesis strategy of this catalyst is universal and conducive to its practical application in fuel cells.

     

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