Although enzyme-modified
electrode is always used to build H2O2 biosensor due to its high selectivity, the enzymatic biosensors still suffer from the insufficient stability which selleck compound originated from the nature of enzymes [4]. Therefore, the study of nonenzymatic H2O2 sensors is aroused in this field. It is known that platinum shows excellent electroactivity because of the efficient electron transfer rate [5, 6]. Platinum with special morphologies, such as spherical [7], cubic [8], nanowires [9], nanoflowers [10], have been reported to construct biosensors. In addition, specific surface area is also a key factor affecting the performance of the biosensor. Therefore, how to increase the specific surface area is the focus in scientific research. Hollow structures have attracted extensive attentions for their special frame and composition. Large inner surface area can be obtained because of the inner void space of hollow structure. In recent years, hollow noble metals have been applied in the field of electrocatalyst due to the high electron transfer rate and large surface area [11]. However, few articles reported the applications of hollow noble metals in the field of biosensors. In the present work, cubic PtCu NCs were fabricated using cuprous oxide (Cu2O) crystals as sacrificial templates, and their electrocatalytic activity towards H2O2
was investigated. The nonenzymatic H2O2 sensors exhibited excellent electrocatalytic www.selleckchem.com/Proteasome.html performance with a high sensitivity and wide linear range for the determination of H2O2. Methods Reagents Chloroplatinic acid, H2O2 (30 wt.% in H2O) and Nafion solution (5.0 wt.% in a mixture of lower aliphatic alcohols and water) were purchased from Sigma-Aldrich (St. Louis, MO, USA). All other reagents were of analytical grade and used as received without further purification (Chengdu Kelong, Chengdu, China).
High-quality deionized water (resistivity > 18.0 MΩ cm-1) used for all experiments was prepared by a Water Purification System (UPT-II-10 T) provided by Chengdu YouPu, Chengdu, China. Preparation of PtCu NCs Cubic Cu2O template was prepared according Amylase to the previous report [12]. Ten milliliters of NaOH aqueous solution (2 M) was added dropwise into the stirred CuCl2 · 2H2O (100 mL, 0.01 M) at 55°C. After stirring for 0.5 h, 10.0 mL ascorbic acid solution (0.6 M) was added. The final products were collected by centrifugation after 3 h, followed by drying in vacuum at 40°C for 24 h. In order to prepare PtCu NCs, 10 mg prepared Cu2O was dispersed in 10 mL distilled water by ultrasonic for 15 min and then 40 mg sodium citrate was added. After stirring for 15 min, 1 mL chloroplatinic acid (20 mM) was added. After reacting for 20 min, 1 mL of dilute HNO3 (5 mM) was injected into the above solution to etch the Cu2O cores. After 40 min, the ultimate products were separated by mild centrifugation and dried at 40°C for 24 h in an oven.