کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6610548 459558 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Onset potential determination at gas-evolving catalysts by means of constant-distance mode positioning of nanoelectrodes
ترجمه فارسی عنوان
تعریف پتانسیل در کاتالیزورهای گاز در حال تحول با استفاده از موقعیت ثابت موقعیت نانو الکترودها
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
The onset potential of an electrocatalytic reaction is frequently used as an indicator to compare the catalytic performance of electrocatalysts. However, in addition to the fact that the onset potential is an undefined physico-chemical value which is dependent on the sensitivity of the used potentiostat its determination using voltammetry at the catalyst-modified electrode surface may be superimposed by additional Faradaic reactions e.g. from redox conversions of the catalyst material or corrosion processes. Gas-evolving electrodes suffer additionally from the dynamics of gas bubble formation and departure leading to inherent limitations of voltammetric studies directly performed at the catalyst-modified electrode. Nanometer-sized electrodes accurately positioned by means of shearforce-based constant-distance mode SECM are proposed for the highly sensitive determination of the onset potential of microcavity electrodes filled with different perovskites as oxygen evolution catalysts. Double barrel microcavity electrodes are additionally suggested for the simultaneous investigation of two catalysts. They enable direct referencing of a catalyst with a benchmark catalyst material in a single experiment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 179, 10 October 2015, Pages 38-44
نویسندگان
, , , , ,