کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6615788 | 459622 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Imparting pH- and small molecule selectivity to nano-Pd catalysts via hydrothermal wrapping with chitosan
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A nano-composite of negatively charged carbon nanoparticles (Emperor 2000â¢), chitosan, and nano-palladium is produced in a one-step hydrothermal process with oxalate reductant. In voltammetric measurements strong pH effects on capacitance and Faradaic current responses are observed due to chitosan forming a shell (or “hydrothermal wrapping”) around both carbon nanoparticles and palladium particles in the water-based hydrothermal process. In spite of the wrapping, some Pd-catalytic processes are observed, but with pH controlling the rate. The shell around Pd nanoparticles appears to only allow small molecule reactants such as H2 and O2 but not formic acid or methanol to reach the active catalyst surface. Membrane-transport limited and reaction-type limited catalytic electrochemical responses are observed with high selectivity. Implications of small molecule selectivity and mechanistic selectivity in suppressing cross-over losses in fuel cell technology are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 110, 1 November 2013, Pages 663-669
Journal: Electrochimica Acta - Volume 110, 1 November 2013, Pages 663-669
نویسندگان
Fengjie Xia, Mu Pan, Shichun Mu, Matthew D. Jones, Gabriele Kociok-Köhn, Shik Chi Tsang, Frank Marken,