An effective strategy to promote hematite photoanode at low voltage bias via Zr4+/Al3+ codoping and CoOx OER co-catalyst

Subramanian, Arunprabaharan; Mahadik, Mahadeo A.; Park, Jin-Woo; Jeong, In Kwon; Chung, Hee‐Suk; Lee, Hyun Hwi; Choi, Sun Hee; Chae, Weon‐Sik; Jang, Jum Suk

doi:10.1016/j.electacta.2019.06.149

Cited by 17 publications

(8 citation statements)

References 67 publications

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“…This means that the in-situ ZZFO/HT-2 electrode experiences a considerable nonradiative process, such as charge transfer, during the electron−hole recombination. 40,41 Interestingly, this observation agrees with the highest photocurrent and the lowest resistances (R 1 and R 2 ) values on the in-situ ZZFO/HT-2 photoelectrode. The in-situ ZZFO/HT-3 with the longest lifetime (0.88 ns) and the highest PL intensity showed the lowest PEC activity among the photoanodes examined in this study.…”

Section: εεsupporting

confidence: 81%

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe₂O₄/Fe₂O₃ Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Kim

Anushkkaran

Chae

et al. 2021

ACS Appl. Energy Mater.

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The development of efficient photoanodes for solar fuel generation via photoelectrochemical (PEC) water splitting is becoming a bottleneck. These limitations necessitate the design of iron-containing metal oxides, like “ferrites-based electrode materials” with improved oxygen evolution kinetics, light absorptivity, and intrinsic stability, yet at a low cost. Herein, we report the in-situ formation of Zr–ZnFe2O4/Fe2O3 heterojunction (ZZFO/HT) photoelectrodes using a facile magnetron sputtering and hydrothermal processes. First, the ZnO is systematically sputtered on in-situ Zr-doped FeOOH electrodes and then the ZnO-sputtered electrodes are quenched at 800 °C, 13 min to form ZZFO/HT. Furthermore, the effect of ZnO sputtering and roles of Zr–ZnFe2O4 and Fe2O3 in the ZZFO/HT heterojunction as well as their structural and photoelectrochemical properties were studied in detail. The optimum biphasic 25.6 nm ZnO-sputtered ZZFO/HT (ZZFO/HT-2) photoelectrode exhibited a photocurrent density of 0.430 mA/cm2 at 1.23 V vs RHE with an appropriate fraction of Zr–ZnFe2O4 and Fe2O3. The enhanced PEC performance is attributed to the optimum fraction of Zr–ZnFe2O4 and Fe2O3 in ZZFO/HT-2 heterojunction, which provides efficient charge transport across the bulk and at heterojunction interface. Lastly, the integration of Al2O3 passivation layer and Co–Pi cocatalyst on the optimized ZZFO/HT-2 photoelectrode exhibited a high photocurrent density of 0.780 mA/cm2 at 1.23 V vs RHE and generated 11.8 and 6.2 μmol/cm2 of hydrogen and oxygen, respectively during PEC water splitting. Further, it is expected that by fine-tuning of Zr–ZnFe2O4 and Fe2O3 NC ratio, the photocurrent density can be improved for establishing a benchmark for ZnFe2O4-based photoelectrodes.

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Section: εεsupporting

confidence: 81%

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe₂O₄/Fe₂O₃ Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Kim

Anushkkaran

Chae

et al. 2021

ACS Appl. Energy Mater.

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“…Thus, the onset potential is 0.1–0.2 V higher than the flat band potential and a slight overpotential is always required. 46 Fig. 7d shows the long-term stability of the prepared photoanodes.…”

Section: Resultsmentioning

confidence: 99%

Microwave-assisted surface attachment of aluminium ions on in situ diluted titanium-doped hematite photoanodes for efficient photoelectrochemical water-splitting

Hwang

Dhandole

Anushkkaran

et al. 2022

Sustainable Energy Fuels

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“…Among these lean metals, those referred to Al, Ga, Sn, and Bi are usually utilized for the OER and HER catalysis, and they improve the OER and HER activity in terms of the following aspects. [ 103,105,206–231 ] i) These lean metals can be readily etched in both the alkaline and acidic solutions, generating beneficial results including the formation of pores and partial phase reconstruction. ii) They can be prone to hybrid with other metals to form the (ordered) intermetallics with high conductivity.…”

Section: Merits Of S‐ P‐ and F‐block Metals In Water Electrolysismentioning

confidence: 99%

The Pivotal Role of s‐, p‐, and f‐Block Metals in Water Electrolysis: Status Quo and Perspectives

et al. 2022

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Basic Understanding of (Pre)catalysts toward Water Electrolysis Catalytic Mechanism of HER and OERWater splitting contains two half-reactions, HER and OER, and they present different reaction pathways in acidic versus alkaline media (Table 1). [76,77] The HER is composed of Volmer/ Heyrovsky or Volmer/Tafel steps as shown in Figure 2A. According to the reaction pathways, four intermediate steps including water adsorption, water dissociation, OH-adsorption, and hydrogen binding are involved in the alkaline HER process. Water adsorption is the first step of hydrogen evolution

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An effective strategy to promote hematite photoanode at low voltage bias via Zr4+/Al3+ codoping and CoOx OER co-catalyst

Cited by 17 publications

References 67 publications

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe₂O₄/Fe₂O₃ Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe₂O₄/Fe₂O₃ Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Microwave-assisted surface attachment of aluminium ions on in situ diluted titanium-doped hematite photoanodes for efficient photoelectrochemical water-splitting

The Pivotal Role of s‐, p‐, and f‐Block Metals in Water Electrolysis: Status Quo and Perspectives

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An effective strategy to promote hematite photoanode at low voltage bias via Zr4+/Al3+ codoping and CoOx OER co-catalyst

Cited by 17 publications

References 67 publications

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe2O4/Fe2O3 Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe2O4/Fe2O3 Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Microwave-assisted surface attachment of aluminium ions on in situ diluted titanium-doped hematite photoanodes for efficient photoelectrochemical water-splitting

The Pivotal Role of s‐, p‐, and f‐Block Metals in Water Electrolysis: Status Quo and Perspectives

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Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe₂O₄/Fe₂O₃ Heterojunction Photoanodes for Photoelectrochemical Water Splitting

Influence of ZnO Magnetron Sputtering on Controlled Buildout of Zirconium-Doped ZnFe₂O₄/Fe₂O₃ Heterojunction Photoanodes for Photoelectrochemical Water Splitting