Cotton-Like Three-Dimensional Sb(4)O(5)Cl(2) Structures: Synthesis and Ammonium Hydroxide Sensing

[Image: see text] Nanostructured materials have emerged as valuable tools for the advancement of novel electrocatalysts. Among them, three-dimensional metal oxides have gained significant attention due to their excellent conductivity, cost-effectiveness, and unique design. This study focuses on the synthesis of cotton-like three-dimensional antimony oxychloride (Sb(4)O(5)Cl(2)) structures through a straightforward precipitation method. The nanostructures exhibit immense potential for sensing applications. Electrochemical characterization reveals that the Sb(4)O(5)Cl(2) heterostructure demonstrates a remarkable double-layer capacitance of 662 F/cm(2), accompanied by excellent cyclic stability. The sensor’s performance was tested for the detection of ammonium hydroxide (HA) in NaCl solution, yielding sensitivities ranging from 0.95 to 0.140 mA mM(–1) cm(–2) and a detection limit of 4.54 μM within a wide detection range of 0.3–250 mM. The sensor device possesses a distinctive cotton-like structure and is synthesized through a simple and cost-effective route.