Controlling the atomic arrangement of elemental atoms in intermetallic catalysts to govern their surface and subsurface properties is a crucial but challenging endeavor in electrocatalytic reactions.In hydrogen evolut...Controlling the atomic arrangement of elemental atoms in intermetallic catalysts to govern their surface and subsurface properties is a crucial but challenging endeavor in electrocatalytic reactions.In hydrogen evolution reaction(HER),adjusting the d-band center of the conventional noble-metallic Pt by introducing Fe enables the optimization of catalytic performance.However,a notable gap exists in research on the effective transition from disordered Fe/Pt alloys to highly ordered intermetallic compounds(IMCs)such as FePt_(3)in the alkaline HER,hampering their broader application.In this study,a series of catalysts FePt_(3-x)H(x=5,6,7,8 and 9)supported on carbon nanotubes(CNTs)were synthesized via a simple impregnation method,along with a range of heat treatment processes,including annealing in a reductive atmosphere,to regulate the order degree of the arrangement of Fe/Pt atoms within the FePt_(3)catalyst.By using advanced microscopy and spectroscopy techniques,we systematically explored the impact of the order degree of FePt_(3)in the HER.The as-prepared FePt_(3)-8H exhibited notable HER catalytic activity with low overpotentials(η=37 mV in 1.0 mol L^(-1)KOH)at j=10 mA cm^(-2).The surface of the L1_(2)FePt_(3)-8H catalyst was demonstrated to be Pt-rich.The Pt on the surface was not easily oxidized due to the unique Fe/Pt coordination,resulting in significant enhancement of HER performance.展开更多
Liquid-liquid phase separation(LLPS)emerges as a general approach for the generation of biomolecular condensates,which play important roles in various biological processes,including chromatin organization,transcriptio...Liquid-liquid phase separation(LLPS)emerges as a general approach for the generation of biomolecular condensates,which play important roles in various biological processes,including chromatin organization,transcription,translation,protein degradation,and signal transduction^([1]).Irregular phase separation is often associated with cancer,neurodegeneration,and other human diseases^([2]).展开更多
作为能源密集型Haber-Bosch工艺合成氨的一种新兴替代品,电化学硝酸盐还原反应(NO_(3)RR)在可持续合成氨和废水处理方面受到了关注.然而,由于缺乏有效的电催化剂,NO_(3)RR目前仍然面临氨产率低和选择性差的问题.本文报道了通过脱合金法...作为能源密集型Haber-Bosch工艺合成氨的一种新兴替代品,电化学硝酸盐还原反应(NO_(3)RR)在可持续合成氨和废水处理方面受到了关注.然而,由于缺乏有效的电催化剂,NO_(3)RR目前仍然面临氨产率低和选择性差的问题.本文报道了通过脱合金法制备的纳米双模式孔Ru掺杂Cu催化剂作为NO_(3)RR的电催化剂,在-0.2 V versus RHE的电位下表现出29.63±0.74 mg h^(-1)mg_(cat.)^(-1)的超高氨产率与97.3%±2.5%的法拉第效率,优于大多数报道的催化剂.密度泛函理论计算表明,在Cu中掺杂Ru可以优化中间体的吸附能,降低NO_(3)RR速控步骤的能垒.此外,Ru原子可以促进H2O的吸附/解离,为含N中间体氢化为NH_(3)提供活性氢.这项工作为NO_(3)RR等过程进行高性能催化剂的合理设计提供了新的途径.展开更多
Multi-channel detection is an effective way to improve data throughput of spectral-domain optical coherence tomography(SDOCT).However,current multi-channel OCT requires multiple detectors,which increases the complexit...Multi-channel detection is an effective way to improve data throughput of spectral-domain optical coherence tomography(SDOCT).However,current multi-channel OCT requires multiple detectors,which increases the complexity and cost of the system.We propose a novel multi-channel detection design based on a single spectrometer.Each camera pixel receives interferometric spectral signals from all the channels but with a spectral shift between two channels.This design effectively broadens the spectral bandwidth of each pixel,which reduces relative intensity noise(RIN)by√M times with M being the number of channels.We theoretically analyzed the noise of the proposed design under two cases:shot-noise limited and electrical noise or RIN limited.We show both theoretically and experimentally that this design can effectively improve the sensitivity,especially for electrical noise or RIN-dominated systems.展开更多
The original online version of this article (Guo, R., Wang, X., Zhang, R., Shi, H<span>., Qiao, Y., Yun, W., Ge, X., Lin, Y. and Lei, J. (2015) Response of Subcutaneous Xenografts of Endometrial Cancer in Nude M...The original online version of this article (Guo, R., Wang, X., Zhang, R., Shi, H<span>., Qiao, Y., Yun, W., Ge, X., Lin, Y. and Lei, J. (2015) Response of Subcutaneous Xenografts of Endometrial Cancer in Nude Mice to Inhibitors of Phosp</span><span>hatidylinositol 3-Kinase/Akt and Mitogen-Activated Protein Kinase (M</span><span>APK) </span><span>Pathways: An Effective Therapeutic Strategy for Endometrial Cancer. Journal of Cancer Therapy, 6, 1083-1092. </span><span "=""><a href="https://doi.org/10.4236/jct.2015.612118" target="_blank"><span>https://doi.org/10.4236/jct.2015.612118</span></a></span><span>) was published in November 2015. The author</span><span>s</span><span> wish</span><span "=""> </span><span>to correct the following error</span><span>.展开更多
基金supported by the National Natural Science Foundation of China(51872115 and 52101256)Beijing Synchrotron Radiation Facility(BSRF)4B9A。
文摘Controlling the atomic arrangement of elemental atoms in intermetallic catalysts to govern their surface and subsurface properties is a crucial but challenging endeavor in electrocatalytic reactions.In hydrogen evolution reaction(HER),adjusting the d-band center of the conventional noble-metallic Pt by introducing Fe enables the optimization of catalytic performance.However,a notable gap exists in research on the effective transition from disordered Fe/Pt alloys to highly ordered intermetallic compounds(IMCs)such as FePt_(3)in the alkaline HER,hampering their broader application.In this study,a series of catalysts FePt_(3-x)H(x=5,6,7,8 and 9)supported on carbon nanotubes(CNTs)were synthesized via a simple impregnation method,along with a range of heat treatment processes,including annealing in a reductive atmosphere,to regulate the order degree of the arrangement of Fe/Pt atoms within the FePt_(3)catalyst.By using advanced microscopy and spectroscopy techniques,we systematically explored the impact of the order degree of FePt_(3)in the HER.The as-prepared FePt_(3)-8H exhibited notable HER catalytic activity with low overpotentials(η=37 mV in 1.0 mol L^(-1)KOH)at j=10 mA cm^(-2).The surface of the L1_(2)FePt_(3)-8H catalyst was demonstrated to be Pt-rich.The Pt on the surface was not easily oxidized due to the unique Fe/Pt coordination,resulting in significant enhancement of HER performance.
基金supported by the National Key Research and Development Program of China(2022YFC3401500,2020YFA0803201,and 2021YFA1302200)the National Natural Science Foundation of China(31830053,31920103007,82341028,82122056,82073153,81972676,31900568,and 32270745)+2 种基金the Natural Science Foundation of Shanghai(23ZR1466500)the Shanghai Municipal Health Commission(2022YQ067)the Fundamental Research Funds for the Central Universities(PA2023000691,PA2023000718,and PA2023000692).
文摘Liquid-liquid phase separation(LLPS)emerges as a general approach for the generation of biomolecular condensates,which play important roles in various biological processes,including chromatin organization,transcription,translation,protein degradation,and signal transduction^([1]).Irregular phase separation is often associated with cancer,neurodegeneration,and other human diseases^([2]).
基金supported by the Science and Technology Research Project of the Education Department of Jilin Province(47120)the National Natural Science Foundation of China(51901083)。
文摘作为能源密集型Haber-Bosch工艺合成氨的一种新兴替代品,电化学硝酸盐还原反应(NO_(3)RR)在可持续合成氨和废水处理方面受到了关注.然而,由于缺乏有效的电催化剂,NO_(3)RR目前仍然面临氨产率低和选择性差的问题.本文报道了通过脱合金法制备的纳米双模式孔Ru掺杂Cu催化剂作为NO_(3)RR的电催化剂,在-0.2 V versus RHE的电位下表现出29.63±0.74 mg h^(-1)mg_(cat.)^(-1)的超高氨产率与97.3%±2.5%的法拉第效率,优于大多数报道的催化剂.密度泛函理论计算表明,在Cu中掺杂Ru可以优化中间体的吸附能,降低NO_(3)RR速控步骤的能垒.此外,Ru原子可以促进H2O的吸附/解离,为含N中间体氢化为NH_(3)提供活性氢.这项工作为NO_(3)RR等过程进行高性能催化剂的合理设计提供了新的途径.
基金supported by the Singapore Ministry of Health’s National Medical Research Council under its Open Fund Individual Research Grant(No.MOH-000384)the Singapore Ministry of Education under its Academic Research Funding Tier 2(No.MOE-T2EP30120-0001)+1 种基金the Academic Research Funding Tier 1(No.RG35/22)the China Scholarship Council,and the National Natural Science Foundation of China(NSFC)(No.12004381)。
文摘Multi-channel detection is an effective way to improve data throughput of spectral-domain optical coherence tomography(SDOCT).However,current multi-channel OCT requires multiple detectors,which increases the complexity and cost of the system.We propose a novel multi-channel detection design based on a single spectrometer.Each camera pixel receives interferometric spectral signals from all the channels but with a spectral shift between two channels.This design effectively broadens the spectral bandwidth of each pixel,which reduces relative intensity noise(RIN)by√M times with M being the number of channels.We theoretically analyzed the noise of the proposed design under two cases:shot-noise limited and electrical noise or RIN limited.We show both theoretically and experimentally that this design can effectively improve the sensitivity,especially for electrical noise or RIN-dominated systems.
文摘The original online version of this article (Guo, R., Wang, X., Zhang, R., Shi, H<span>., Qiao, Y., Yun, W., Ge, X., Lin, Y. and Lei, J. (2015) Response of Subcutaneous Xenografts of Endometrial Cancer in Nude Mice to Inhibitors of Phosp</span><span>hatidylinositol 3-Kinase/Akt and Mitogen-Activated Protein Kinase (M</span><span>APK) </span><span>Pathways: An Effective Therapeutic Strategy for Endometrial Cancer. Journal of Cancer Therapy, 6, 1083-1092. </span><span "=""><a href="https://doi.org/10.4236/jct.2015.612118" target="_blank"><span>https://doi.org/10.4236/jct.2015.612118</span></a></span><span>) was published in November 2015. The author</span><span>s</span><span> wish</span><span "=""> </span><span>to correct the following error</span><span>.
