Ni-Co层状双氢氧化物纳米片对对硝基苯酚还原的催化性能
Superior-catalytic performance of Ni-Co Layered double hydroxide nanosheets for the reduction of p-nitrophenol
摘要：
层状双金属氢氧化物（LDHs）由于其层状结构能够容纳更多的活性中心，有利于电子向材料降解方向的转移，因而在催化应用方面受到了极大的关注。此外，LDHs的高催化活性与其容易的阴离子交换，特定的电子结构和多功能的化学组成有关。最近，具有三元或三元组合的LDHs优选用于对硝基苯酚的氢化，对硝基苯酚是工业废水中常见的有毒和致癌污染物。在此，提出了一种具有成本效益的共沉淀制备方案以获得Ni-Co层状双氢氧化物。LDH的二维结构中活性中心的有序排列以及Ni和Co的协同催化作用大大提高了对硝基苯酚（p-NP）转化为对氨基苯酚（p-AMP）的效率。还显示了在较高温度下的催化性能。所得结果进一步扩展，以探索Ni-Co LDH作为析氢反应（HER）的电催化剂的优势。
英文摘要：
Layered double-hydroxides (LDHs) are superior to the conventional (Transition Metal Oxides) TMOs as their lamellar morphology accommodates higher active sites contributing to the facile electron transfer towards the material degradation relations, thus attracts an immense attention for catalysis application. Moreover, the high catalytic activity of LDHs is linked to their facile anion exchange, specific electronic structures, and versatile chemical compositions. Recently, LDHs with bimetallic or ternary combinations are preferably used for hydrogenation of p-nitrophenol, a toxic and carcinogenic pollutant commonly found in industrial wastewater. Herein, a cost-effective co-precipitation fabrication protocol to obtain Ni-Co layered double hydroxide is proposed. The well-defined arrangement of active sites in the 2D structure of LDH, and the synergistic catalytic effect of Ni and Co greatly improves the efficiency for the conversion of p-nitrophenol (p-NP) to p-aminophenol (p-AMP). The catalytic performance at higher temperatures is also shown. The obtained results are further extended to explore the advantage of Ni-Co LDH as an electrocatalyst for Hydrogen Evolution Reaction (HER).
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