Emitters with narrowband spectra are of great importance nowadays because of the growing demand for ultra-high-definition displays in the fields of panel displays and solid-state lighting.Though the reported multiple ...Emitters with narrowband spectra are of great importance nowadays because of the growing demand for ultra-high-definition displays in the fields of panel displays and solid-state lighting.Though the reported multiple resonance(MR)emitters have been widely studied with extremely sharp spectra and color-tunable emissions,the electrophilic borylation synthetic strategies and stable narrowband blue devices still face great challenges.展开更多
The development of highly active and cost-effective hydrogen evolution reaction （HER） catalysts is of vital importance to addressing global energy issues. Here, a three-dimensional interconnected porous carbon nanof...The development of highly active and cost-effective hydrogen evolution reaction （HER） catalysts is of vital importance to addressing global energy issues. Here, a three-dimensional interconnected porous carbon nanofiber （PCNF） membrane has been developed and utilized as a support for active cobalt phosphide （COP） nanoparticles. This rationally designed self-supported HER catalyst has a lotus root-like multichannel structure, which provides several intrinsic advantages over conventional CNFs. The longitudinal channels can store the electrolyte and ensure fast ion and mass transport within the catalysts. Additionally, mesopores on the outer and inner carbon walls enhance ion and mass migration of the electrolyte to HER active CoP nanoparticles, thus shortening the ion transport distance and increasing the contact area between the electrolyte and the CoP nanoparticles. Moreover, the conductive carbon substrate provides fast electron transfer pathways by forming an integrated conductive network, which further ensures fast HER kinetics. As a result, the CoP/PCNF composites exhibit low onset-potentials （-20, -91, and -84 mV in 0.5 M H2SO4, 1 M PBS, and 1 M KOH, respectively）. These findings show that CoP/PCNF composites are promising self-supporting and high-performance all-pH range HER catalysts.展开更多
The amplitude-dependent ac susceptibility of high-temperature superconductors is shown to obey some empirical scaling relations. We try to analyze this behavior by extending a dc nonlinear response function of mixed s...The amplitude-dependent ac susceptibility of high-temperature superconductors is shown to obey some empirical scaling relations. We try to analyze this behavior by extending a dc nonlinear response function of mixed state to the ac cases. The derived equations for critical current and ac susceptibility x(T) agree with the scaling relations of experimental data.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.51903137,22135004 and 61890942)the Guangdong Basic and Applied Basic Research Foundation(2021B1515120041).
文摘Emitters with narrowband spectra are of great importance nowadays because of the growing demand for ultra-high-definition displays in the fields of panel displays and solid-state lighting.Though the reported multiple resonance(MR)emitters have been widely studied with extremely sharp spectra and color-tunable emissions,the electrophilic borylation synthetic strategies and stable narrowband blue devices still face great challenges.
基金The authors are grateful for the financial support from the National Natural Science Foundation of China （Nos. 51433001 and 51373037）, the Program of Shanghai Academic Research Leader （No. 17XD1400100）.
文摘The development of highly active and cost-effective hydrogen evolution reaction （HER） catalysts is of vital importance to addressing global energy issues. Here, a three-dimensional interconnected porous carbon nanofiber （PCNF） membrane has been developed and utilized as a support for active cobalt phosphide （COP） nanoparticles. This rationally designed self-supported HER catalyst has a lotus root-like multichannel structure, which provides several intrinsic advantages over conventional CNFs. The longitudinal channels can store the electrolyte and ensure fast ion and mass transport within the catalysts. Additionally, mesopores on the outer and inner carbon walls enhance ion and mass migration of the electrolyte to HER active CoP nanoparticles, thus shortening the ion transport distance and increasing the contact area between the electrolyte and the CoP nanoparticles. Moreover, the conductive carbon substrate provides fast electron transfer pathways by forming an integrated conductive network, which further ensures fast HER kinetics. As a result, the CoP/PCNF composites exhibit low onset-potentials （-20, -91, and -84 mV in 0.5 M H2SO4, 1 M PBS, and 1 M KOH, respectively）. These findings show that CoP/PCNF composites are promising self-supporting and high-performance all-pH range HER catalysts.
基金the National Natural Science Foundation of China (Nos.51433001and 51373037)the Program of Shanghai Academic Research Leader (No.17XD1400100)Natural Science Foundation of Jiangsu Province (No.BK20150238).
基金This work was supported by the Ministry of Science and Technology of China(Grant No.NKBRSG-G 1999064602)the National Natural Science Foundation of China(Grant Nos.10174003 and 50377040).
文摘The amplitude-dependent ac susceptibility of high-temperature superconductors is shown to obey some empirical scaling relations. We try to analyze this behavior by extending a dc nonlinear response function of mixed state to the ac cases. The derived equations for critical current and ac susceptibility x(T) agree with the scaling relations of experimental data.
