Reversible solid-liquid-solid transition controlled by temperature or solvent plays a vital role in manufacturing and recycling many important materials. However, this kind of transition is hard to be realized for insoluble and labile materials, for instance coordination polymers. In this work, we introduce a volatile dissociating agent to realize reversible liquification and solidification of a kind of coordination polymer, Prussian blue. The Prussian blue powders are disassociated into electrolytic solution by hydrochloride acid (the volatile dissociating agent) and transformed back to solids via volatilization of the hydrochloride vapor. Using this solid-liquid-solid transition, Prussian blue powders are cast into single crystals with various shapes (i.e., inverse opal, mesoporous) or single-crystal matrix composites with functional networks encapsulated (i.e., carbon, silicon, TiO₂). Significant improvements of the performance of Prussian blue in secondary battery, seawater battery, water treatment, etc., are observed after casting. Moreover, all of the cast Prussian blue materials can be recycled.

由温度或溶剂控制的可逆固-液-固转变在许多重要材料的制造和回收中发挥着至关重要的作用。然而，这种转变对于不溶性和不稳定的材料（例如配位聚合物）很难实现。在这项工作中，我们引入了一种挥发性解离剂来实现一种配位聚合物普鲁士蓝的可逆液化和固化。普鲁士蓝粉末被盐酸（挥发性解离剂）解离到电解溶液中，并通过盐酸蒸气的挥发转回固体。利用这种固-液-固转变，普鲁士蓝粉末被铸造成各种形状的单晶（即反蛋白石、₂）。铸造后普鲁士蓝在二次电池、海水电池、水处理等方面的性能显着改善。此外，所有铸造的普鲁士蓝材料都可以回收利用。