A new form of Cu2O, disk-like structure with 60 nm in thickness and 2 μm in diameter,has been successfully synthesized in bulk quantities by polyol process in the presence of PVP K-30.
In this paper, we report the fabrication of the photocatalysts composed of Cu_2O nanobelts and nanoporous Cu(NP Cu)substrate, which is obtained by soaking the NP Cu in dehydrated ethanol. The NP Cu substrate is achiev...In this paper, we report the fabrication of the photocatalysts composed of Cu_2O nanobelts and nanoporous Cu(NP Cu)substrate, which is obtained by soaking the NP Cu in dehydrated ethanol. The NP Cu substrate is achieved by dealloying of Ti_(40.6)Zr_(9.4)Cu_(40.6)Ni_(6.3)Sn_(3.1) amorphous ribbons in HF solutions. The dealloying process is considered to be a thermally activated process, obeying the Arrhenius law. The surface diffusivity increases with increasing dealloying temperature and concentration of HF solutions. The activation energy of the diffusion of Cu adatoms is estimated to be 76.4 kJ/mol. The Cu_2O nanobelts with the width of 10–15 nm and the length of about 1 lm are formed on the surface of NP Cu after immersion in dehydrated ethanol. The photocatalysts of Cu_2O on nanoporous Cu exhibit superior photocatalytic activity toward the degradation of methyl orange and methylene blue under the irradiation of the sunlight due to the coexistence of Cu_2O semiconductor nanobelts and large amount of heterojunctions as flowing path for photoelectrons.展开更多
Reaction between Cu_2S and Cu_2O was investigated at 1150 to 1250℃.The reaction rate in- creases with the increase of surface area of Cu_2O grains and depends unobviously on temper- ature.At the suggestion of control...Reaction between Cu_2S and Cu_2O was investigated at 1150 to 1250℃.The reaction rate in- creases with the increase of surface area of Cu_2O grains and depends unobviously on temper- ature.At the suggestion of controlling step of reaction rate being oxygen diffusion through the liquid layer along reaction boundaries,two final kinetical equations would be made as follows: x=6.69×10^(-2)At for 0<α<0.74 and ln(l-α)=-A(9.83×10^(-2)t+1.76)for 0.74<α<1,where α is SO_2 evolved in time t and A is surface area of Cu_2O particles.展开更多
We improved the photovoltaic properties of Cu_2O-based heterojunction solar cells using n-type oxide semiconductor thin films prepared by a sputtering apparatus with our newly developed multi-chamber system. We also o...We improved the photovoltaic properties of Cu_2O-based heterojunction solar cells using n-type oxide semiconductor thin films prepared by a sputtering apparatus with our newly developed multi-chamber system. We also obtained the highest efficiency(3.21%) in an AZO/p-Cu_2O heterojunction solar cell prepared with optimized pre-sputtering conditions using our newly developed multi-chamber sputtering system. This value achieves the same or higher characteristics than AZO/Cu_2O solar cells with a similar structure prepared by the pulse laser deposition method.展开更多
An efficient process for the conversion of dimethyl oxalateinto ethylene glycol with high selectivity and high yield over CuO was investigated. In situ formed Cu as a true catalytically active species showed a good ca...An efficient process for the conversion of dimethyl oxalateinto ethylene glycol with high selectivity and high yield over CuO was investigated. In situ formed Cu as a true catalytically active species showed a good catalytic performance for DMO conversion to produce EG in 95% yield.展开更多
基金This work was supported by the National Natural Science Foundation of ChinaNatural Science Foundation of Qinghai Province.
文摘A new form of Cu2O, disk-like structure with 60 nm in thickness and 2 μm in diameter,has been successfully synthesized in bulk quantities by polyol process in the presence of PVP K-30.
基金financially supported by the National Natural Science Foundation of China under Grant No. 51671106the Natural Science Foundation of Jiangsu Province under Grant Nos. BK20171424 and BK2015153
文摘In this paper, we report the fabrication of the photocatalysts composed of Cu_2O nanobelts and nanoporous Cu(NP Cu)substrate, which is obtained by soaking the NP Cu in dehydrated ethanol. The NP Cu substrate is achieved by dealloying of Ti_(40.6)Zr_(9.4)Cu_(40.6)Ni_(6.3)Sn_(3.1) amorphous ribbons in HF solutions. The dealloying process is considered to be a thermally activated process, obeying the Arrhenius law. The surface diffusivity increases with increasing dealloying temperature and concentration of HF solutions. The activation energy of the diffusion of Cu adatoms is estimated to be 76.4 kJ/mol. The Cu_2O nanobelts with the width of 10–15 nm and the length of about 1 lm are formed on the surface of NP Cu after immersion in dehydrated ethanol. The photocatalysts of Cu_2O on nanoporous Cu exhibit superior photocatalytic activity toward the degradation of methyl orange and methylene blue under the irradiation of the sunlight due to the coexistence of Cu_2O semiconductor nanobelts and large amount of heterojunctions as flowing path for photoelectrons.
文摘Reaction between Cu_2S and Cu_2O was investigated at 1150 to 1250℃.The reaction rate in- creases with the increase of surface area of Cu_2O grains and depends unobviously on temper- ature.At the suggestion of controlling step of reaction rate being oxygen diffusion through the liquid layer along reaction boundaries,two final kinetical equations would be made as follows: x=6.69×10^(-2)At for 0<α<0.74 and ln(l-α)=-A(9.83×10^(-2)t+1.76)for 0.74<α<1,where α is SO_2 evolved in time t and A is surface area of Cu_2O particles.
基金partly supported by Grant-in-Aid for Scientific Research on Innovative Areas from the Ministry of Education, Culture, Sports, Science and Technology of Japan (No.15K04723)
文摘We improved the photovoltaic properties of Cu_2O-based heterojunction solar cells using n-type oxide semiconductor thin films prepared by a sputtering apparatus with our newly developed multi-chamber system. We also obtained the highest efficiency(3.21%) in an AZO/p-Cu_2O heterojunction solar cell prepared with optimized pre-sputtering conditions using our newly developed multi-chamber sputtering system. This value achieves the same or higher characteristics than AZO/Cu_2O solar cells with a similar structure prepared by the pulse laser deposition method.
基金financial support from the State Key Program of National Natural Science Foundation of China(No.21436007)Key Basic Research Projects of Science and Technology Commission of Shanghai(14JC1403100)+2 种基金the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning(ZXDF160002)the Projectsponsored by SRF for ROCS,SEM(BG1600002)State Key Laboratory of Fine Chemicals(KF1411)
文摘An efficient process for the conversion of dimethyl oxalateinto ethylene glycol with high selectivity and high yield over CuO was investigated. In situ formed Cu as a true catalytically active species showed a good catalytic performance for DMO conversion to produce EG in 95% yield.
