کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
178915 459327 2015 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In situ characterisation of PEM water electrolysers using a novel reference electrode
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
In situ characterisation of PEM water electrolysers using a novel reference electrode
چکیده انگلیسی


• An innovative reference electrode is demonstrated for PEM water electrolysers.
• Cell voltage decay after shutdown is found to be due to rising cathode potential.
• In situ measurement of Pt cathode ECSA is carried out for the first time in a PEMWE.
• Potential cycling as an accelerated degradation test led to decay of cathode ECSA.
• Cathode catalyst degradation should not be ignored in PEMWE durability studies.

Polymer electrolyte membrane water electrolysers (PEMWEs) are a promising technology for hydrogen production but catalyst degradation mechanisms are poorly understood, hampering informed catalyst design for extended lifetimes and the use of more economical loadings. Here we demonstrate the application of an innovative reference electrode to the study of catalyst degradation in an operating PEMWE. This approach enables separation of the relative contribution of anode and cathode to the overall water splitting reaction. It is shown that, in shut-down periods during power cycling, the cathode contributes more to changes in open circuit voltage than the anode. Changes in the electrochemical surface area of the platinum cathode as a result of power cycling are measured in situ for the first time using hydrogen underpotential cyclic voltammetry. The results demonstrate that degradation of the platinum cathode plays a more significant role than conventionally assumed by the electrolyser community, which has tended to focus more on the iridium/ruthenium oxide anode because it dominates the performance of the cell.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 52, March 2015, Pages 1–4
نویسندگان
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