Nano multi-layered HfO2/α-Fe2O3 nanocomposite photoelectrodes for photoelectrochemical water splitting

Programmable Wet-Interfacial Joule Heating to Rapidly Synthesize Metastable Protohematite Photoanodes: Metal and Lattice Oxygen Dual Sites for Improving Water Oxidation

“…Figure S19 shows the Nyquist plots of the Fe 2 O 3 -muffle and Fe 2 O 3 -Joule photoanodes at various potentials ranging from 0.8 to 1.4 V vs RHE, which were fitted using the EC (Figure S19) to gain more insights into charge transport characteristics. As depicted in Figure e, the values of R s of both photoanodes are essentially constant with applied bias, indicating that the proposed EC and fitting method are reliable . Moreover, the Fe 2 O 3 -Joule photoanode exhibits a smaller R s than the Fe 2 O 3 -muffle sample, which is reasonable since the very short heating period of programmable wet-interfacial Joule heating causes less damage the FTO substrate to conserve the good electrical conductivity.…”

“…As depicted in Figure 6e, the values of R s of both photoanodes are essentially constant with applied bias, indicating that the proposed EC and fitting method are reliable. 55 Moreover, the Fe 2 O 3 -Joule photoanode exhibits a smaller R s than the Fe 2 O 3muffle sample, which is reasonable since the very short heating period of programmable wet-interfacial Joule heating causes less damage the FTO substrate to conserve the good electrical conductivity. Figure 6f,g presents the values of R trap and C bulk of Fe 2 O 3 -muffle and Fe 2 O 3 -Joule photoanodes, respectively, where the Fe 2 O 3 -Joule photoanode exhibits lower R trap and higher C bulk than those of the Fe 2 O 3 -muffle film over the entire potential range, indicating the fast hole transport in the bulk of the Fe 2 O 3 -Joule photoanode because the generation of abundant iron vacancies endows an increased carrier density.…”