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一個(gè)關(guān)于光電化學(xué)產(chǎn)氫論文中的問(wèn)題
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請(qǐng)大家看看這段文字,摘自(J. Phys. Chem. 1996, 100, 13061-13078),在該論文(見(jiàn)附件)的第13067頁(yè)的第三段。該段話說(shuō)由于對(duì)電極金屬電極費(fèi)米能級(jí)低于H+/H2的標(biāo)準(zhǔn)電極電位,因此不可能還原氫離子,這段文字提出的一種解決方法是給工作電極施加一個(gè)陽(yáng)極偏壓,這樣做就可以抬高金屬電極的費(fèi)米能級(jí)從而可以還原氫離子了。我對(duì)他提出的這種方法不理解,有哪位大俠可以給解釋一下,謝謝! Under illumination (Figure 9), the Fermi level in the semiconductor bulk rises toward Ufb. With the two electrodes shorted together, the maximum Fermi level possible in the cell is the flat-band potential. In Figure 9, Ufb is below the H+/H2 redox potential. Hence, even with illumination intensity sufficient to completely flatten the semiconductor bands, H2 cannot be evolved at the counter electrode because the Fermi level is below the H+/H2 potential. To raise the Fermi level in the metal counter electrode above the H+/H2 potential, an external anodic bias, Eb, must be applied, as shown in Figure 9. This bias also provides the overvoltage at the metal cathode, èe, required to sustain the current flow, and it increases the band bending in the semiconductor to maintain the required charge-separation rate. |
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