Fe3N-Co2N Nanowires Array: A Non-Noble-Metal Bifunctional Catalyst Electrode for High-Performance Glucose Oxidation and H2O2 Reduction toward Non-Enzymatic Sensing Applications

Among reported electrode materials, a nanoarray is an attractive architecture for molecular detection because of its large specific surface area and easy accessibility for target molecules. Here, a new Fe 3 N-Co 2 N nanowires array grown on carbon cloth (Fe 3 N-Co 2 N/CC) is reported as a non-noble-metal bifunctional catalyst electrode for high-performance glucose oxidation and H 2 O 2 reduction. As an electrochemical non-enzymatic sensor for glucose detection, Fe 3 N-Co 2 N/CC shows a fast response time of 8 s, a low detection limit (LOD) of 77 n m (signal/noise=3), and a high sensitivity of 4333.7 μA m m −1 cm −2 . As an H 2 O 2 sensor, it shows a LOD of 59 n m (signal/noise=3) and a sensitivity of 2273.8 μA m m −1 cm −2 with a response time of 2 s. In addition, the proposed sensor is stable with high selectivity, specificity, and reproducibility, and its application for real sample analysis has been successfully demonstrated. Graphical A Fe 3 N-Co 2 N nanowires array behaves as a non-noble-metal bifunctional catalyst electrode for high-performance glucose oxidation and H 2 O 2 reduction and, thus, selective non-enzymatic detection. For glucose detection, it shows a low detection limit (LOD) of 77 n m (signal/noise=3) and a sensitivity of 4333.7 μA m m −1 cm −2 . As an H 2 O 2 sensor, it shows an LOD of 59 n m with a sensitivity of 2273.8 μA m m −1 cm −2 .