Development of a novel H2-CO2 fuel cell which reduces carbon dioxide during electric power generation

通过使用具有Pt/C基阳极和阴极的PEFC单电池，通过分别向阳极和阴极供给H2和CO2来评价发电性能。此外，检测到从PEFC排出的CO2还原产物。主要结果总结如下。(1)发现CO2还原电位相对于DHE为0.05-0.4 V，这比HOR电位正。这成功地证明了H2-CO2 PEFC的发电能力。(2)所产生的功率随着H2-CO2 PEFC的操作温度的增加而增加，这表明CO2还原是热激活的。(3)在0.051 V vs. DHE的控制电位下，H2-CO2 PEFC的阴极电流以2 h循环变化，表明阴极Pt被CO2还原产物中毒，然后恢复。(4)发现CO2还原产物/中间体是甲烷和甲醇。

By using a PEFC single cell having Pt/C-based anode and cathode, power generation properties were evaluated by feeding H2 and CO2 to the anode and cathode, respectively. In addition, CO2 reduction products exhausted from the PEFC were detected. Main results are summarized as follows. (1) CO2 reduction potential is found to be 0.05-0.4 V vs. DHE, which is positive than the HOR potential. This succeeded to demonstrate the power generation of the H2-CO2 PEFC. (2) The generated power increased with an increase in the operation temperature of the H2-CO2 PEFC, suggesting that the CO2 reduction is thermally activated. (3) Under the controlled potential of 0.051 V vs. DHE, the cathode current of the H2-CO2 PEFC changed by 2 h cycle, implying that the cathode Pt is poisoned by the CO2 reduction product and then recovered. (4) CO2 reduction products/intermediates are found to be methane and methanol.