A kind of nickel metaphosphate micro-nano material and its preparation method and application

Abstract

The invention relates to a nickel metaphosphate micro-nanomaterial as well as a preparation method and an application thereof. The micro-nanomaterial has a nano sheet array structure, and the lamellar thickness of nano sheets is less than 20nm. The nickel metaphosphate micro-nanomaterial is prepared through the preparation method comprising the following steps: dissolving a soluble nickel salt and weak base molecules in a solvent to react together with carbon cloth to obtain a nickel-containing precursor / carbon cloth complex, and then performing heat treatment on the nickel-containing precursor / carbon cloth complex and a phosphate compound in an inert atmosphere to obtain the nickel metaphosphate micro-nanomaterial. Based on a structure duplication thought, the invention adopts a two-step method to achieve preparation of a micro-nanostructure and growth of a nickel metaphosphate crystal phase, respectively, the preparation of the nickel metaphosphate micro-nanomaterial with a single crystal phase is achieved, the experiment operation is simple and safe, and scale production and application can be achieved. The prepared nickel metaphosphate micro-nanomaterial has a significant pseudocapacitance characteristic, and the specific capacitance is greater than 2000F / g when the discharge current is 1A / g, so that the nickel metaphosphate micro-nanomaterial has a good potential application prospect in the aspect of electrochemical energy storage.

Description

technical field [0001] The invention relates to a nickel metaphosphate micro-nano material and a preparation method and application thereof, belonging to the technical field of inorganic nano-materials. Background technique [0002] In recent years, metal phosphate compounds with open micro-nano structures have broad application prospects in the fields of ion exchange, adsorption, separation, and catalysis, and have always been a research hotspot for researchers. However, due to the incomplete development of transition metal metaphosphate, it is difficult to obtain transition metal metaphosphate micro-nano materials with specific stoichiometric composition and rich morphology, so the follow-up research on its potential application has also been obtained. Extremely restrictive. [0003] At present, transition metal metaphosphoric acid compounds can be produced mainly by heating highly toxic phosphorus, phosphorous acid or phosphoric acid and metal salts, but the products are...

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Problems solved by technology

However, due to the incomplete development of transition metal metaphosphate, it is difficult to obtain transition metal metaphosphate micro-nano materials with specific stoichiometric composition and rich morphology, so the follow-up research on its potential application has also been obtained. extremely restrictive

[0003] At present, transition metal metaphosphoric acid compounds can be produced mainly by heating highly toxic phosphorus, phosphorous acid or phosphoric acid and metal salts, but the products are glassy or polymeric, without specific crystal morphology and microstructure characteristics

There have been reports about the preparation of metaphosphoric acid micro-nano materials in the prior art, such as literature (Inorg. Phosphoric acid and nickel chloride, manganese chloride conversion to NiHPO 3 ˙H 2 O and MnHPO 3 ˙H 2 O crystallizes, but its reaction time is longer (≥3 days)

Another example is that in the document (Cryst.GrowthDes.2008,8,3636), it is disclosed that nickel sulfate is combined with sodium hypophosphite, hexamethylenetetramine (HMT), cetyltrimethylammonium bromide (CTAB), and ammonia water. Under the action, react at 150°C for 24 hours to generate NiHPO with a single crystal structure 3 ·H 2 O nanoneedle structure, but its reaction system is complex and the controllability of the structure is not high

Another example is that the literature (Adv.Func.Mater.2013,23,227) discloses that the thermolysis molecular precursor method (TMP) can convert the molecular precursor Co[O 2 P(O t Bu) 2 ] 2 } n The mixture with nickel foam is heated and converted into Co(PO 3 ) 2 nanoparticles, and the Co(PO 3 ) 2 Nanomaterials have higher electrocatalytic water oxidation reaction activity than cobalt oxide, but this method requires the preparation of molecular precursors, which is complicated and costly

[0004] However, other metaphosphates such as nickel metaphosphate Ni(PO 3 ) 2 Research on functional materials with micro-nanostructures has not been reported yet

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