http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kim, Chang Ki,Zhou, Haoran,Kowalewski, Tomasz,Matyjaszewski, Krzysztof,Kim, Hwan Kyu American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.2
<P>Among various photovoltaic devices, dye-sensitized solar cells (DSSCs) are one of the most potentially clean and renewable energy conversion devices because of their low fabrication cost, environmentally friendly nature, and high power conversion efficiency. However, the use of rare metals such as Pt counter electrodes (CEs) is one of the major drawbacks of DSSC devices for broad real-life applications. In this regard, alternative materials to Pt CEs have been long sought for DSSCs employing both cobalt and iodine redox couples. Therefore, in this study, soft-templated tellurium-doped mesoporous carbons (<B>Te-SMC</B>s) were synthesized for the first time by the simple pyrolysis of PAN-<I>b</I>-PBA block copolymer in the presence of a tellurium precursor for replacing the Pt CE. To confirm the chemical composition and porosity, the as-prepared <B>Te-SMC</B> materials were evaluated by elemental analysis (XPS and EDS) and nitrogen sorption isotherms measurement. The as-prepared <B>Te-SMC</B> materials contained mainly mesopores and retained the three-dimensional hierarchical graphite-like structure with many defect sites. They displayed doping levels with nitrogen of 9.15 atom % and tellurium of 0.15 atom % and had a specific surface area of 540 m<SUP>2</SUP> g<SUP>-1</SUP>. Therefore, these characteristics enabled the development of a high-performance CE in DSSCs with cobalt and iodine redox couples. As a result of its catalytic performance, <B>Te-SMC</B> exhibited outstanding electrocatalytic activity as well as a significantly improved electrochemical stability than those of Pt CE for both redox couples even after 1000 potential cycles. The results show that a maximum conversion efficiency of 11.64 and 9.67% could be achieved under one sun illumination (AM 1.5G) for <B>SGT-021</B>/Co(bpy)<SUB>3</SUB><SUP>2+/3+</SUP>- and <B>N719</B>/I<SUP>-</SUP>/I<SUB>3</SUB><SUP>-</SUP>-based devices with <B>Te-SMC</B> CEs, and their power conversion efficiency is superior to the corresponding device with Pt CEs.</P> [FIG OMISSION]</BR>
Chiaki Nishiura,Valerie Williams,Krzysztof Matyjaszewski 한국고분자학회 2017 Macromolecular Research Vol.25 No.6
Iron and copper complexes with anionic phenolate-bis(pyridyl)amine ligands were synthesized and examined as catalysts for atom transfer radical polymerization (ATRP) of methyl (meth)acrylate and styrene. With copper complexes, polymers with narrow molecular weight distributions, M w/M n ~1.2, were prepared. The catalytic performance of copper catalysts was affected by nature of halogen species and by the steric and electronic effects. In iron-mediated ATRP procedures, the number-average molecular weights of the polymers increased with monomer conversion, however, the molecular weight distributions of the resulting polymers were relatively broad M w/M n~1.7, due to slow deactivation processes.