Method for preparing high-purity metal nitride micro-nano coral

The invention discloses a method for preparing high-purity metal nitride. According to the preparation method, low-pressure radio frequency plasma is adopted for nitriding the surfaces of metal nickel and nickel-molybdenum alloy, the nickel nitride and nickel-molybdenum nitride nano coral structure is prepared, and the micro-nano structure can be used as a high-performance catalyst in industrial hydrogen production. Nickel nitride and nickel molybdenum nitride micro-nano coral structures can be prepared in situ in a normal-temperature environment by a low-pressure radio-frequency capacitive plasma technology, compared with metal nitride film structures prepared by other plasma systems, the nitride obtained by the method has higher specific surface area and electrocatalytic activity, and in addition, the working atmosphere adopted by the method is nitrogen, so that the preparation method is suitable for large-scale industrial production. And compared with ammonia gas calcination widely adopted in the existing