Tóm tắt

Ferroelectric photoelectrodes such as Pb(Zr0.2Ti0.8)O3 (PZT), with the high built-in electric for the separation ofrnphotoexcited carriers, are ideal candidates for photoelectrochemical (PEC) water splitting. However, the largernbandgap and the poor conduction have limited the PEC performance of PZT photoelectrodes to date. To conquerrnthese intrinsic drawbacks, we proposed the designed photoelectrode based on ferroelectric PZT film and surfacerndecoration of discontinuous CdS nanoparticles toward enhanced PEC water splitting. More specifically, thernferroelectric PZT substrate with a spontaneous ferroelectric polarization could effectively segregated the chargerncarriers that generated in the bulk of photoelectrode. Meanwhile, the electron-hole pairs near the interface ofrnPZT film and CdS nanoparticle could be effectively separated and transferred on account of the resulted p-nrnjunction. Besides, the limitations of PZT include wide band gap and poor conductivity can be conquered byrndecorated CdS nanoparticles, which not only play as an electron conductor to trap photoinduced electronsrntransferred from PZT but also enhance the solar light harvesting own to their narrow band gap. The as-preparedrnphotoelectrodes exhibited an enhanced photocurrent density (at 0 V vs. Ag/AgCl), which was 11 times than thatrnof pure PZT films. This work may provide a new strategy toward the rational design of high performancernferroelectric-based photoelectrodes