Copper-based materials derived from metal-organic frameworks for electrochemical sensing of hydrazine

An effective and rapid method for the detection of hydrazine hydrate is urgently needed as a result of its high toxicity and extensive use. Here, copper nanoparticles supported on carbon (written as: Cu NP/C) and copper oxide polycrystalline solids (written as: CuO PS), synthesized by calcining the same metal–organic framework at high temperature, were respectively used as electrode materials for electrochemical sensing hydrazine. The results show that the prepared Cu NP/C exhibits a better performance with a sensitivity of 0.1726 mA (mmol/L) −1 , a wider linear range of 0.1–2.4 mM and a lower detection limit of 0.0014 mmol·L −1 , compared to the obtained CuO PS. This can be reasonably explained by the lower copper valence state and its interaction with the carbon supports in Cu NP/C. Furthermore, the good selectivity and anti-interference ability from the Cu NP/C are also acquired for electrochemical detection of hydrazine.