Thermal conductivity reduction by nanostructuration in electrodeposited CuNi alloys

Abstract

In the last years, the use of inexpensive and scalable materials in the industry for thermoelectric applications has received great interest, such as CuNi alloys. In this work, nanocrystalline CuNi...

Multi-Interface-Induced Thermal Conductivity Reduction and Thermoelectric Performance Improvement in a Cu–Ni Alloy

“…The highest value is 7.0 mW m –1 K –2 , obtained in the sample under 773 K/35 MPa (Figure c). It is comparable to or even higher than the previously reported Cu–Ni-based values. ,,, It is noted that the highest porosity (25.2%) in the 673 K/15 MPa sample in our work does not deteriorate the power factor as happened before, , and still maintains the high value around 4.1 mW m –1 K –2 comparable to the counterparts in previous studies, as shown in Table S4.…”

“…It is comparable to or even higher than the previously reported Cu−Ni-based values. 21,29,32,36 It is noted that the highest porosity (25.2%) in the 673 K/15 MPa sample in our work does not deteriorate the power factor as happened before, 60,61 and still maintains the high value around 4.1 mW m −1 K −2 comparable to the counterparts in previous studies, as shown in Table S4. The resultant zT increases when temperature increases, as shown in Figure 7a.…”

“…24−28 Researchers have proposed several practical strategies to reduce thermal conductivity by introducing nanoscaled defects in Cu−Ni-based alloys. For instance, Manzano et al 29 obtained Cu 55 Ni 45 with a grain size down to 30−40 nm through pulsed electrodeposition, resulting in the thermal conductivity reduced by 3.2 times and zT increased by 1.3 times. Mao et al 30 prepared bulk Cu 55 Ni 45 with nanotwins through ball milling and hot pressing, in which a reduced thermal conductivity (∼16%) and an increased Seebeck coefficient (∼12%) were obtained simultaneously.…”

Detection and detoxification of imidacloprid in food samples through ionic liquid-stabilized CuNi alloy nanoparticle-decorated multiwall carbon nanotubes

“…1F). 38,39 These diffraction peaks confirm the formation of a single solid solution phase with the FCC structure of CuNi alloy and complete conversion of metal ions into pure metal nanoparticles in CuNi/IL@MWCNTs. The crystalline size of CuNi/IL nanoparticles decorated on MWCNTs was calculated using the Debye–Scherrer formula and found to be 55 nm, which was in good agreement with the obtained AFM images.…”

Environmentally Friendly Thermoelectric Materials: High Performance from Inorganic Components with Low Toxicity and Abundance in the Earth

“…[28,29,205] Other forms of nanostructuring materials result in more conventional but eco-friendly semiconductors are being revisited for thermoelectric applications recently. The effect of nanostructuration in semiconductors is shown for instance, in our work with CuNi, [206] where through nanostructuring the material, fairly good thermoelectric properties are achieved. Also through nanostructuration, the properties of Silicon, which is a very poor thermoelectric material in its bulk form, can be enhanced.…”