44
C. Juhong et al.
film limiting current density j f when the Nafion film thickness was ≤0.3 μm. For
40 mA.cm
−2 , when the net kinetic current is less than 4 mA.cm
−2 , which is less
than 10% of the limiting current density j f of the Nafion membrane, its effect on
the measured current is negligible. When the same calculation method calculates
333 K, the limit current density j f of the Nafion membrane is 70 mA cm
−2 . As
long as the net kinetic current is less than 7 mA.cm
−2 , the effect on the measured
current is negligible. This also means that the maximum mass activity obtained from
the experiment is 1 A.mg-1, which is very close to the maximum mass activity of
the actual PEMFC. In addition, the research team verified the effectiveness of this
method in hydrogen reduction and oxygen oxidation, and introduced TF-RRDE.
The collection coefficient of the method and the influence of film thickness were
discussed. The results show that the method is suitable for testing oxygen reduction
and high reproducibility of intermediate materials, and the data deviation is within
the experimental allowable range.
The TF-R(R)DE method is simple, the catalyst film is completely wetted, the
participation rate of electron conduction and ion conduction is 100%, the amount of
catalyst required is very small, and the current correction is simple and easy, and the
kinetics of the catalyst can be directly quantitative analysis of the limits. Therefore,
this method has been widely applied to the electrochemical kinetic performance
analysis of catalysts since Schmidt and Gasteiger proposed and verified feasibility.
3.3 Electrochemical Reduction Test
The oxygen reduction test first requires a suitable electrolytic cell. The electrolytic
cell for measuring the oxygen reduction reaction of the rotating circular (ring) disk
electrode is composed of a glass tank, a working electrode, a counter electrode and
a reference electrode. Here the working electrode is a rotating circular (ring) disk
electrode.
3.3.1 Reference Electrode
The measurement of the oxygen reduction reaction requires a stable reference electrode, the reference electrode does not contaminate the electrolyte and itself cannot
be contaminated by the electrolyte. Reference electrodes commonly used in electrochemical testing include standard hydrogen electrodes (SHE), saturated calomel electrodes (SCE), silver/silver chloride electrodes (Ag/AgCl), mercury/mercury oxide
electrodes (Hg/HgO), and Reversible hydrogen electrode (RHE).
The measurement of the oxygen reduction reaction requires a stable reference
electrode, which should not contaminate the electrolyte and itself should not be
C. Juhong et al.
film limiting current density j f when the Nafion film thickness was ≤0.3 μm. For
40 mA.cm
−2 , when the net kinetic current is less than 4 mA.cm
−2 , which is less
than 10% of the limiting current density j f of the Nafion membrane, its effect on
the measured current is negligible. When the same calculation method calculates
333 K, the limit current density j f of the Nafion membrane is 70 mA cm
−2 . As
long as the net kinetic current is less than 7 mA.cm
−2 , the effect on the measured
current is negligible. This also means that the maximum mass activity obtained from
the experiment is 1 A.mg-1, which is very close to the maximum mass activity of
the actual PEMFC. In addition, the research team verified the effectiveness of this
method in hydrogen reduction and oxygen oxidation, and introduced TF-RRDE.
The collection coefficient of the method and the influence of film thickness were
discussed. The results show that the method is suitable for testing oxygen reduction
and high reproducibility of intermediate materials, and the data deviation is within
the experimental allowable range.
The TF-R(R)DE method is simple, the catalyst film is completely wetted, the
participation rate of electron conduction and ion conduction is 100%, the amount of
catalyst required is very small, and the current correction is simple and easy, and the
kinetics of the catalyst can be directly quantitative analysis of the limits. Therefore,
this method has been widely applied to the electrochemical kinetic performance
analysis of catalysts since Schmidt and Gasteiger proposed and verified feasibility.
3.3 Electrochemical Reduction Test
The oxygen reduction test first requires a suitable electrolytic cell. The electrolytic
cell for measuring the oxygen reduction reaction of the rotating circular (ring) disk
electrode is composed of a glass tank, a working electrode, a counter electrode and
a reference electrode. Here the working electrode is a rotating circular (ring) disk
electrode.
3.3.1 Reference Electrode
The measurement of the oxygen reduction reaction requires a stable reference electrode, the reference electrode does not contaminate the electrolyte and itself cannot
be contaminated by the electrolyte. Reference electrodes commonly used in electrochemical testing include standard hydrogen electrodes (SHE), saturated calomel electrodes (SCE), silver/silver chloride electrodes (Ag/AgCl), mercury/mercury oxide
electrodes (Hg/HgO), and Reversible hydrogen electrode (RHE).
The measurement of the oxygen reduction reaction requires a stable reference
electrode, which should not contaminate the electrolyte and itself should not be