Preparation of MnO ultrafine particles on the elec -

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Preparation of MnO ultrafine particles on the electrocatalytic performance of PEMFC

2.3MnO ultrafine particles on the electrocatalytic performance of PEMFC preliminary study of the important reasons is the commercialization of PEMFC power density is low, to improve the PEMFC power density 0, it is necessary to increase the output voltage. In hydrogen fuel cell,[link widoczny dla zalogowanych], the theoretical output voltage of the battery 1.23V, while the actual output voltage is far below 1.23V, the general can only reach 0.9V or so, this is due to the oxygen electrode reaction is not fully in accordance with (). A 2HO +2 H +4 \Oxygen electrode in the \performance. In this experiment, adding a platinum catalyst, MnO ultrafine particles of about 5nm to promote the second electron reaction of Ho. Rapid decomposition, so that the potential rise]. MnO particles in the catalytic mechanism of this reaction are as follows: In the fuel cell O. The concentration of large, and the added surface area larger than the catalyst, which has strong adsorption capacity,[link widoczny dla zalogowanych], making the surface of the catalyst unit in high concentrations of oxygen, resulting in the following reaction occurs manganese oxide: 2MnO + O a 2MnO, generated MnO particle size is still the nanometer scale, MnO and the electrode reaction: 2MnO2 +2 H2O2-2MnO +2 H2o +202 MnO2 +2 Hzo +2 e - 2MnOOH +2 H of a water and oxygen generated by the battery discharge outlet so that only prompted the Second, a four-electron reaction and promote the electronic response is the catalyst, while the role of catalytic reaction of the two electrodes, making the battery output voltage can be increased. (Continued from page 31) Figure 2 fuel cell plus MnO particles before discharge curve: after adding 3.2 MnO particles discuss the experimental results show that licorice concentration is low, the E. coli in the exponential growth phase was significantly higher thermal power , indicating that E. coli can promote licorice; when the high concentration of licorice, E. coli in the exponential phase of the thermal power was reduced, that view of licorice on the E. coli was inhibited. -C from the equation shows that optimum growth of E. coli concentration 0.192g/mL, when = 0 critical growth concentration is 0.541g/ml. Saponins are a class of plants is very important biologically active substances,[link widoczny dla zalogowanych], are synthetic hormone drugs contraceptives and the main raw material,[link widoczny dla zalogowanych], now isolated from the plant has 400 kinds of saponin Saponins chemistry circles as the fuel cell discharge curve 3 amplification curve of one plus particulate MnO MnO particles before the i-plus after the addition, the battery discharge blood line of view, adding catalyst and without catalyst not the same as the battery discharge process, the initial catalyst and the battery output voltage by approximately 20mV . This shows that MnO has reduced the role of the electrode overpotential. At the same time discharge the battery of blood lines can be seen, the output voltage between 0.3 ~ 0.8V, add catalyst,[link widoczny dla zalogowanych], electrode polarization are significantly lower, indicating that MnO particles are reduced polarization effects, but also see After adding catalyst, the discharge curve more smooth, more stable process, indicating that MnO ultrafine particles and has a battery electrode reaction the role of stabilizer. Above explanation is just electro-catalytic properties of MnO ultrafine particles of the initial study, the specific mechanisms still need further depth in future research.

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