二维过渡金属材料因其特殊的物理结构在电催化领域具有广阔的应用前景，然而巨大的纵向比表面积使其容易发生团聚，限制了电催化性能的提高。采用协同腐蚀沉淀法（CEP）将Co （OH）₂纳米片[Co （OH）₂ NSs]生长在Ni （OH）₂纳米笼[Ni （OH）₂ NCs]支架上，改善了其团聚问题。作为抗坏血酸（AA）检测电极，Ni （OH）₂ NCs@Co （OH）₂ NSs/玻碳电极[Ni （OH）₂ NCs@Co （OH）₂NSs/GCE]在2.5~1.55 mmol/L范围内，灵敏度高达113 μA/（mmol/L·cm²），高于Co （OH）₂ NSs/GCE和Ni （OH）₂ NCs/GCE，证明将二维过渡金属材料固定在空心支架上可有效提高电催化活性。

Two-dimensional (2D) transition metal materials have broad application prospects in electrocatalysis due to their special physical structure.However, they are prone to agglomeration owing to huge longitudinal specific surface, which limits their electroactivity.In this work, Co(OH)₂ nanosheets (Co(OH)₂ NSs) grow on Ni(OH)₂ nanocages (Ni(OH)₂ NCs) through using a coordinated etching and precipitation (CEP) method to prevent agglomeration.As an detection electrode for ascorbic acid, Ni(OH)₂ NCs@Co(OH)₂ NSs/glassy carbon electrode (Ni(OH)₂ NCs@Co(OH)₂ NSs/GCE) presents a sensitivity as high as 113 μA/(mmol·L^-1·cm²) between 2.5 μmol·L^-1-1.55 mmol·L^-1, which is higher than Co(OH)₂ NSs/GCE[98 μA/(mmol·L^-1·cm²)] and Ni(OH)₂ NCs/GCE[84 μA/(mmol·L^-1·cm²)].It is verified that the deposition of 2D transition metal materials onto hollow scaffolds can effectively improve the electrocatalytic activity.

刘宇苗(1996-),男,硕士研究生,研究方向为电化学生物传感器,1490016990@qq.com。