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首页> 外文期刊>Chemistry: A European journal >Controlled Synthesis of Nanoporous Nickel Oxide with Two-Dimensional Shapes through Thermal Decomposition of Metal-Cyanide Hybrid Coordination Polymers
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Controlled Synthesis of Nanoporous Nickel Oxide with Two-Dimensional Shapes through Thermal Decomposition of Metal-Cyanide Hybrid Coordination Polymers

机译：金属-氰化物杂化配位聚合物的热分解可控合成二维形状的纳米多孔氧化镍

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摘要

The urgent need for nanoporous metal oxides with highly crystallized frameworks is motivating scientists to try to discover new preparation methods, because of their wide use in practical applications. Recent work has demonstrated that two-dimensional (2D) cyanide-bridged coordination polymers (CPs) are promising materials and appropriate for this purpose (Angew. Chem. Int. Ed. 2013, 52, 1235). After calcination, 2D CPs can be transformed into nanoporous metal oxides with a highly accessible surface area. Here, this strategy is adopted in order to form 2D nanoporous nickel oxide (NiO) with tunable porosity and crystallinity, using trisodium citrate dihydrate as a controlling agent. The presence of trisodium citrate dihydrate plays a key role in the formation of 2D nanoflakes by controlling the nucleation rate and the crystal growth. The size of the nanoflakes gradually increases by augmenting the amount of trisodium citrate dihydrate in the reaction. After heating the as-prepared CPs in air at different temperatures, nanoporous NiO can be obtained. During this thermal treatment, organic units (carbon and nitrogen) are completely removed and only the metal content remains to take part in the formation of nanoporous NiO. In the case of large-sized 2D CP nanoflakes, the original 2D flake-shapes are almost retained, even after thermal treatment at low temperature, but they are completely destroyed at high temperature because of further crystallization in the framework. Nanoporous NiO with high surface area shows significant efficiency and interesting results for supercapacitor application.
机译：具有高度结晶构架的纳米多孔金属氧化物的迫切需求正促使科学家尝试发现新的制备方法，因为它们在实际应用中得到了广泛的应用。最近的工作表明，二维（2D）氰化物桥联的配位聚合物（CP）是很有前途的材料，并且适合于此目的（Angew。Chem。Int。Ed。2013，52，1235）。煅烧后，可以将2D CP转化为具有高可及表面积的纳米多孔金属氧化物。这里，采用该策略是为了使用柠檬酸三钠二水合物作为控制剂来形成具有可调的孔隙率和结晶度的二维纳米多孔氧化镍（NiO）。柠檬酸三钠二水合物的存在通过控制成核速率和晶体生长，在2D纳米薄片的形成中起关键作用。通过增加反应中柠檬酸三钠二水合物的量，纳米薄片的尺寸逐渐增加。在空气中以不同温度加热所制备的CP后，可以获得纳米多孔NiO。在此热处理过程中，有机单元（碳和氮）被完全除去，仅金属含量保留下来，参与了纳米多孔NiO的形成。在大尺寸2D CP纳米片的情况下，即使在低温下进行热处理后，原始的2D片状形状也几乎可以保留，但由于骨架中的进一步结晶，它们在高温下会被完全破坏。具有高表面积的纳米多孔NiO对于超级电容器应用显示出显着的效率和有趣的结果。

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