The Preparation And Electrochemical Performance Of Three-dimensional Cu（OH）₂ Nanotube Array Electrodes

With the development of hollow one-dimensional materials,Cu（OH）₂ nanotubes have achieved lots of attraction owing to their porous nanostructures.Because the particular structures not only provide for loading more mass and transporting more ion to the internal bulk of CH but also expedite the electron transport along the length,Cu（OH）₂ nanotubes were widely used in energy conversion,energy storage,biosensing and catalysts.Taking advantage of the unique nanostructures of Cu（OH）₂ nanotubes,we designed hollow core-shell nanotubes for Cu（OH）₂-Carbonate Hydroxide（CH）compound,noble metal interspersed Cu（OH）₂-CH compound.Based the superiority of Cu（OH）₂ nanotubes,we prepared several compounds using Cu（OH）₂ nanotubes as a template.1.We prepared Cu（OH）₂ nanotubes by one-step solution method in room temperature.The Cu（OH）₂ nanotubes grown on copper foil were used as supercapacitors.In three-electrode system,Cu（OH）₂ nanotubes/copper foil electrodes were used as working electrode for supercapacitors,which are superior to the activity Cu（OH）₂ nanorods/copper foil electrodes and Cu（OH）₂ nanobundles/copper foil electrodes.They exhibit a high areal capacitance of 278 mF cm^-2 at the current density of 1 mA cm^-2,along with an excellent rate capability and a long cycling lifetime.2.Based on the study of Cu（OH）₂ nanotubes for supercapacitors,we fabricated Cu（OH）₂ nanotubes/copper foil electrodes as biosensors for gulose oxidation catalysis.The 3D electrodes were also used as nonenzymatic sensors for the electrochemical detection of glucose and exhibit superior catalytic performance to the activity Cu（OH）₂nanorods/copper foil electrodes and Cu（OH）₂ nanobundles/copper foil electrodes.The Cu（OH）₂ nanotubes/copper foil electrodes exhibited high sensitivity(4705μA cm^-2mM^-1),detection limit（0.2μM）and excellent selectivity.3.Using Cu（OH）₂ nanotubes as template,we prepared a novel tubular core-shell hierarchical Cu（OH）₂@CoNiCH compound grown on copper foams as integrated electrodes as efficient oxygen evolution reaction catalysts.The integrated electrodes are synthesized by simple solution method together with a low-temperature hydrothermal process.The Cu（OH）₂@CoNiCH nanotubes with porous and hierarchical open structure possess large scale of active surface area,numerous active sites and easy accessibility of water,leading to a fast ion and electron transfer across the entire Cu（OH）₂@CoNiCH nanotubes/copper foam electrode.,the open-structured Cu（OH）₂@CoNiCH nanotubes/copper foam integrated electrode exhibits much lower overpotential of 288 mV and 326 mV at the current density of 30 mA cm^-2 and 100 mA cm^-2,respectively,also with an extraordinarily low Tafel slope of 74 mV dec^-1 along with a superior durability.4.Using Cu（OH）₂@CoNiCH nanotubes as template,we prepared a novel high conductivity noble metal Pd interspersed tubular core-shell hierarchical Cu（OH）₂@CoNiCH compound grown on copper foams as integrated electrodes as efficient oxygen evolution reaction catalysts.The Cu（OH）₂@CoNiCH nanotubes with porous and hierarchical open structure possess large scale of active surface area,numerous active sites and high conductivity,leading to a fast ion and electron transfer across the entire Cu（OH）₂@CoNiCH-Pd nanotubes/copper foam electrode.,the open-structured Cu（OH）₂@CoNiCH Pd nanotubes/copper foam integrated electrode exhibits much lower overpotential of 111 mV and 153 mV at the current density of 30 mA cm^-2 and 300 mA cm^-2,respectively,also with an extraordinarily low Tafel slope of 37.55mV dec^-1 along with a superior durability.