Rhodium oxides, including a misfitlayered structure with alternate stacking of a rock salttype layer and a hexagonal RhO2 layer, are expected to have good thermoelectric properties. Among them, the thermoelectric prop...Rhodium oxides, including a misfitlayered structure with alternate stacking of a rock salttype layer and a hexagonal RhO2 layer, are expected to have good thermoelectric properties. Among them, the thermoelectric properties (electrical conductivity (σ), Seebeck coefficient (S), Figure of merit (ZT) and calculated thermal conductivity (κ) by S, σ, ZT, and absolute temperature (T)) of bismuth-based rhodium oxides ((Bi1-x,Pbx) 2Sr2Rh2Oy, x = 0 and 0.02, hereafter BSR and BPSR, respectively) were investigated. In comparison with Bi2Sr2Co2Oy (BSC) at 700°C, S and κ enhanced (increased S, 110 (BSR) and 105 μV K-1 (BPSR) from 85 μV K-1 (BSC) and decreased κ, 0.32 (BSR) and 0.50 W m-1 K-1 (BPSR) from 1.75 W m-1 K-1 (BSC)), whereas σ decreased (15 (BSR) and 31 S cm-1 (BPSR) from 70 S cm-1 (BSC)). BPSR reached the highest ZT value of 0.067 at 700°C, compared to those of 0.056 (BSR) and 0.027 (BSC).展开更多
Based on direct-current transient Harman method,an integrated characterization system of thermoelectric device’s performance is established.The overall properties of thermoelectric modules with sandwiched structures ...Based on direct-current transient Harman method,an integrated characterization system of thermoelectric device’s performance is established.The overall properties of thermoelectric modules with sandwiched structures are experimentally investigated,including Seebeck coefficients,figures of merit(ZT),electrical and thermal conductivities.Experiment results reveal that ZT values of thermoelectric modules are smaller than those of commercial bismuth telluride(Bi2Te3)modules.In contrast,Seebeck coefficients are significantly larger than traditional thermoelectric device’s values.Meanwhile,both electrical and thermal conductivities are greater compared with literature data.Our results have proposed a feasible and economical way that can potentially increase Seebeck coefficients as to bulk Bi2Te3materials without significant deterioration to the nature of Peltier effect.展开更多
文摘Rhodium oxides, including a misfitlayered structure with alternate stacking of a rock salttype layer and a hexagonal RhO2 layer, are expected to have good thermoelectric properties. Among them, the thermoelectric properties (electrical conductivity (σ), Seebeck coefficient (S), Figure of merit (ZT) and calculated thermal conductivity (κ) by S, σ, ZT, and absolute temperature (T)) of bismuth-based rhodium oxides ((Bi1-x,Pbx) 2Sr2Rh2Oy, x = 0 and 0.02, hereafter BSR and BPSR, respectively) were investigated. In comparison with Bi2Sr2Co2Oy (BSC) at 700°C, S and κ enhanced (increased S, 110 (BSR) and 105 μV K-1 (BPSR) from 85 μV K-1 (BSC) and decreased κ, 0.32 (BSR) and 0.50 W m-1 K-1 (BPSR) from 1.75 W m-1 K-1 (BSC)), whereas σ decreased (15 (BSR) and 31 S cm-1 (BPSR) from 70 S cm-1 (BSC)). BPSR reached the highest ZT value of 0.067 at 700°C, compared to those of 0.056 (BSR) and 0.027 (BSC).
基金supported by the National Natural Science Foundation of China(51138005,51376097)the National Basic Research Program of China(2013CB228300)
文摘Based on direct-current transient Harman method,an integrated characterization system of thermoelectric device’s performance is established.The overall properties of thermoelectric modules with sandwiched structures are experimentally investigated,including Seebeck coefficients,figures of merit(ZT),electrical and thermal conductivities.Experiment results reveal that ZT values of thermoelectric modules are smaller than those of commercial bismuth telluride(Bi2Te3)modules.In contrast,Seebeck coefficients are significantly larger than traditional thermoelectric device’s values.Meanwhile,both electrical and thermal conductivities are greater compared with literature data.Our results have proposed a feasible and economical way that can potentially increase Seebeck coefficients as to bulk Bi2Te3materials without significant deterioration to the nature of Peltier effect.
