NiAl Layered Double Hydroxides and PdNiO as Multifunctional Anodes for Prospective Self-Powered Lab-on-a-Chip Dopamine Sensors

摘要

The purpose of this work is the evaluation of two bimetallic materials, PdNiO and NiAl-layered double hydroxides (NiAl-LDHs) for their prospective use in Lab-on-a-Chip devices, in which urea contained in human urine is used as fuel to provide the energy required by the device and dopamine in the sample is detected. A urea microfluidic fuel cell, using human urine as fuel and NiAl-LDHs and PdNiO as anodes, was constructed and evaluated, resulting in a cell potential of 1 V with 50.19 mW/cm(2) power density for NiAl-LDHs and 0.9 V and 32.94 mW/cm(2) for PdNiO. The multifunctionality of these anodes was extended for detecting dopamine with detection limits of 7.38x10(-8) M and 5.46x10(-6) M for NiAl-LDHs and PdNiO, respectively. The higher content of hydroxides on NiAl-LDHs than PdNiO material allowed a better activity for urea oxidation and dopamine detection. These results show the prospects for self-powered biomedical Lab-on-a-Chip device development.