Multiscale architectures boosting thermoelectric performance of copper sulfide compound

Abstract

Owing to their high performance and earth abundance, copper sulfides (Cu 2− x S) have attracted wide attention as a promising medium-temperature thermoelectric material. Nanostructure and grain-boundary engineering are explored to tune the electrical transport and phonon scattering of Cu 2− x S based on the liquid-like copper ion. Here multiscale architecture-engineered Cu 2− x S are fabricated by a room-temperature wet chemical synthesis combining mechanical mixing and spark plasma sintering. The observed electrical conductivity in the multiscale architecture-engineered Cu 2− x S is four times as much as that of the Cu 2− x S sample at 800 K, which is attributed to the potential energy filtering effect at the new grain boundaries. Moreover, the multiscale architecture in the sintered Cu 2− x S increases phonon scattering and results in a reduced lattice thermal conductivity of 0.2 W·m −1 ·K −1 and figure of merit ( zT ) of 1.0 at 800 K. Such a zT value is one of the record values in copper sulfide produced by chemical synthesis. These results suggest that the introduction of nanostructure and formation of new interface are effective strategies for the enhancement of thermoelectric material properties. Supplementary Information The online version of this article (10.1007/s12598-020-01698-6) contains supplementary material, which is available to authorized users.

Cu Vacancy Induced Product Switching from Formate to CO for CO2 Reduction on Copper Sulfide

“…30,31 The Cu LMM Auger spectrum in Figure S7 further proves the existence of Cu 1+ . 32 According to the peak areas, the relative ratios of Cu 1+ /Cu 2+ are estimated to be 1.4:1 for SNC@Cu 2 S and 1.08:1 for SNC@Cu 1.96 S. The ratio of Cu 1+ /Cu 2+ decreases from 1.4 to 1.08, confirming the formation of Cu vacancies in SNC@ Cu 1.96 S 29,33 inferred from the HR-TEM, XRD, and EPR results. The S 2p XPS spectra of SNC@Cu 1.96 S and SNC@ Cu 2 S are shown in Figure S8.…”

“…For the Cu 2p spectrum of SNC@Cu 1.96 S in Figure g, the deconvoluted peaks centered at 954.1 eV (Cu 2p1/2) and 934.05 eV (Cu 2p3/2) are assigned to Cu 2+ , and the peaks at 952.25 eV (Cu 2p1/2) and 932.27 eV (Cu 2p3/2) are assigned to Cu 1+ or Cu 0 . , The Cu LMM Auger spectrum in Figure S7 further proves the existence of Cu 1+ . According to the peak areas, the relative ratios of Cu 1+ /Cu 2+ are estimated to be 1.4:1 for SNC@Cu 2 S and 1.08:1 for SNC@Cu 1.96 S. The ratio of Cu 1+ /Cu 2+ decreases from 1.4 to 1.08, confirming the formation of Cu vacancies in SNC@Cu 1.96 S , inferred from the HR-TEM, XRD, and EPR results. The S 2p XPS spectra of SNC@Cu 1.96 S and SNC@Cu 2 S are shown in Figure S8.…”

Achieving High Thermoelectric Properties of Cu2Se via Lattice Softening and Phonon Scattering Mechanism

“…Previous studies have proposed that the atoms in superionic conductors can migrate freely within the framework. The above-mentioned theory has been fully validated in the Cu 2 Se, Cu 2 S, and Ag 9 GaSe 6 systems . Zhao et al confirmed that the zT value of superionic conductors could be optimized by introducing lattice vibration behaviors, , configuration entropy effects, doping effects, and hierarchical structures .…”

Ball milling synthesis of Fe3O4 nanoparticles-functionalized porous boron nitride with enhanced cationic dye removal performance

“…Even so, PBN has mostly existed in a powder state, thus making it difficult to separate from wastewater aer adsorption. [19][20][21][22] Poor recyclability has limited its practical application in the eld of water treatment. The combination of PBN with magnetic nanomaterials to prepare composite adsorbents is an effective strategy to solve this problem.…”