2
P. K. Shen
research on this reaction has been very extensive. In 2012, there were more than
800 research papers in English. However, most people who are engaged in oxygen
reduction research are not very clear about the concept of oxygen reduction theory,
and there are some test technical problems in experiments. Therefore, many oxygen
reduction curves or data we have seen from published literature are not satisfactory,
and in many cases, it is not the problem of materials, but the problem of testing
methods. At present, commercial Pt/C catalyst is used as a reference for oxygen
reduction activity, and the phenomenon that its oxygen reduction activity is lower
than 100 mA m-g
−1 still exists. In addition, it is more common for the limit current
value to be lower than 6 mA cm
−2 or low oxygen reduction onset potential under
standard test conditions. Research articles that directly convert data between reference electrodes without giving necessary explanation abound. However, the mass
activity of the catalyst can change by 20 mA m-g
−1 for every 10 mV of potential
shift, so the authenticity of the ultra-high activity of the catalyst reported in these
literatures is questioned. In addition, the different oxygen reduction test conditions
such as scanning speed, rotating speed and catalyst loading scene set by different
literatures and research teams will not only affect the test results but also be unfavorable to objectively compare the catalytic activities of different catalysts qualitatively
or quantitatively.
Therefore, from the mechanism of oxygen reduction reaction, it is necessary to
discuss the measurement technology of oxygen reduction reaction in detail, discuss
the key skills of obtaining oxygen reduction polarization curve and analyze the
experimental data, so as to obtain the correct experimental method for evaluating
oxygen reduction performance and summarize the matters needing attention in the
test process, so as to effectively improve the practicability of the experimental test
technology.
1.2 Kinetic Mechanism of Oxygen Reduction Reaction
With the rapid development of science and technology, people’s quality of life is
improving day by day, and the demand for energy is also growing. Rapid increasing
industry and population, the gap of available resources on the earth is increasing day
by day, and the traditional fossil fuel resources will be exhausted in the near future.
According to the survey report of the World Energy Organization, mineral energy
such as coal, oil and natural gas will be exhausted in the next 100 ~ 200 years. In
addition, a large number of fossil fuels are burned, resulting in CO 2 , N 2 O, sulfide
and other pollutants harmful to the atmosphere and human body, causing serious
environmental pollution. Therefore, it is urgent to find an efficient, safe, clean and
economical means of energy utilization to solve the urgent task of rational energy
utilization. Fuel cell has become the first new energy with great potential.
Fuel cell is an electrochemical device that directly converts the chemical energy
generated by the reaction of fuel and oxidant into electrical energy. It is not limited by
P. K. Shen
research on this reaction has been very extensive. In 2012, there were more than
800 research papers in English. However, most people who are engaged in oxygen
reduction research are not very clear about the concept of oxygen reduction theory,
and there are some test technical problems in experiments. Therefore, many oxygen
reduction curves or data we have seen from published literature are not satisfactory,
and in many cases, it is not the problem of materials, but the problem of testing
methods. At present, commercial Pt/C catalyst is used as a reference for oxygen
reduction activity, and the phenomenon that its oxygen reduction activity is lower
than 100 mA m-g
−1 still exists. In addition, it is more common for the limit current
value to be lower than 6 mA cm
−2 or low oxygen reduction onset potential under
standard test conditions. Research articles that directly convert data between reference electrodes without giving necessary explanation abound. However, the mass
activity of the catalyst can change by 20 mA m-g
−1 for every 10 mV of potential
shift, so the authenticity of the ultra-high activity of the catalyst reported in these
literatures is questioned. In addition, the different oxygen reduction test conditions
such as scanning speed, rotating speed and catalyst loading scene set by different
literatures and research teams will not only affect the test results but also be unfavorable to objectively compare the catalytic activities of different catalysts qualitatively
or quantitatively.
Therefore, from the mechanism of oxygen reduction reaction, it is necessary to
discuss the measurement technology of oxygen reduction reaction in detail, discuss
the key skills of obtaining oxygen reduction polarization curve and analyze the
experimental data, so as to obtain the correct experimental method for evaluating
oxygen reduction performance and summarize the matters needing attention in the
test process, so as to effectively improve the practicability of the experimental test
technology.
1.2 Kinetic Mechanism of Oxygen Reduction Reaction
With the rapid development of science and technology, people’s quality of life is
improving day by day, and the demand for energy is also growing. Rapid increasing
industry and population, the gap of available resources on the earth is increasing day
by day, and the traditional fossil fuel resources will be exhausted in the near future.
According to the survey report of the World Energy Organization, mineral energy
such as coal, oil and natural gas will be exhausted in the next 100 ~ 200 years. In
addition, a large number of fossil fuels are burned, resulting in CO 2 , N 2 O, sulfide
and other pollutants harmful to the atmosphere and human body, causing serious
environmental pollution. Therefore, it is urgent to find an efficient, safe, clean and
economical means of energy utilization to solve the urgent task of rational energy
utilization. Fuel cell has become the first new energy with great potential.
Fuel cell is an electrochemical device that directly converts the chemical energy
generated by the reaction of fuel and oxidant into electrical energy. It is not limited by