Abstract
Porous coral-like Pd/C3N4-C nanocomposites are fabricated by a simple one-pot chemical reduction method. Their electrocatalytic performance is ~50% higher than a carbon-loaded palladium electrocatalyst (Pd/C) in alkaline media. This confirms that the glucose electrooxidation and sensing performance of a Pd/C can be improved by the synergy of graphitic carbon nitride (C3N4), though C3N4 exhibits poor electrical conductivity. Compared to Pd/C, the size of Pd nanoparticles in Pd/C3N4-C decreases. As a result, the activity of Pd/C3N4-C is enhanced due to the higher dispersion and the synergistic effect. Pd/C3N4-C presents a rapid response and high sensitivity to glucose. The sensitivity for glucose sensing at Pd/C3N4-C is 3.3 times that of at Pd/C in the range of 0.001–10 mM. In the lower range of 0.001–1 mM, the sensitivity at Pd/C3N4-C is ~10 times greater than Pd/C.
Highlights
Glucose electrooxidation reaction (GOR), which has been studied for more than 100 years [1], is the key chemical reaction in nonenzymatic-glucose sensors and direct glucose fuel cells [2,3]
The hydrogen bubbles produced in the hydrolysis of NaBH4 act as dynamic templates of the coral-like Pd/C3 N4 -C
Coral-like porous Pd/C3N4-C electrocatalysts were synthesized by a simple room-temperature reduction method
Summary
Glucose electrooxidation reaction (GOR), which has been studied for more than 100 years [1], is the key chemical reaction in nonenzymatic-glucose sensors and direct glucose fuel cells [2,3]. We consider that C3 N4 may be used as excellent electrocatalytic support in Pd-based catalysts for GOR. Besides the activity for GOR, the Pd/C3 N4 -C shows competitive glucose-sensing performance compared to some other electrocatalysts reported recently [10,11,12,13,14,15,16,17,18] (Table 1). This confirms that Pd/C3 N4 -C is a good electrocatalyst for GOR.
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