Fe2O3 nanorods/CuO nanoparticles p-n heterojunction photoanode: Effective charge separation and enhanced photoelectrochemical properties

Ma, Jialin; Wang, Qian; Li, Linli; Zong, Xiaohang; Sun, Hao; Tao, Ran; Fan, Xiaoxing

doi:10.1016/j.jcis.2021.05.140

Cited by 48 publications

(13 citation statements)

References 51 publications

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“…The BiVO 4 /Cu x O electrode delivered a photocurrent density of ∼2.8 mA cm –2 at 1.23 V RHE , and the enhanced PEC activity was explained by formation of the p–n junction and electrocatalytic activity of the copper oxides . Therefore, the formation of a p–n junction electrode with p-CuO helps to enhance the overall PEC performance by improving light-harvesting ability, enhancing charge separation, and offering rapid water oxidation kinetics. ,, …”

Section: Introductionmentioning

confidence: 96%

“…Because of the enhanced charge separation and visible-light harvesting, the CuO/ZnO photoanode delivered a photocurrent density of 0.97 mA cm –2 at +1.23 V RHE , which was 4-fold higher than ZnO . Similarly, Ma et al developed a Fe 2 O 3 /CuO p–n junction electrode toward PEC water oxidation in which the p–n junction electrode delivered a photocurrent density of 0.7 mA cm –2 , which was 2.6 times higher than that of Fe 2 O 3 . These studies inspired us to investigate the BiVO 4 /CuO p–n junction electrode for PEC water splitting.…”

Section: Introductionmentioning

confidence: 99%

“…34 Similarly, Ma et al developed a Fe 2 O 3 /CuO p−n junction electrode toward PEC water oxidation in which the p−n junction electrode delivered a photocurrent density of 0.7 mA cm −2 , which was 2.6 times higher than that of Fe 2 O 3 . 35 These studies inspired us to investigate the BiVO 4 /CuO p−n junction electrode for PEC water splitting.…”

Section: Introductionmentioning

confidence: 99%

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Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO₄ Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Murugan

Pandikumar

2022

ACS Appl. Energy Mater.

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High photoinduced charge recombination process and indolent water oxidation kinetics are major drawbacks of the bismuth vanadate (BiVO4) photoanode in photoelectrocatalytic (PEC) water splitting. To address these issues, a bismuth vanadate/copper oxide (BiVO4/CuO) p–n junction electrode was fabricated via the electrodeposition method, and its PEC performance was studied using 0.1 M potassium phosphate (KPi) as an electrolyte under AM 1.5G (100 mW cm–2) irradiation. At an optimized condition, the BiVO4/CuO p–n junction electrode showed improvement in the current density of 2.05 mA cm–2 at +1.23 VRHE, which was ∼2-fold higher than the BiVO4 electrode (0.99 mA cm–2). The applied bias photon-to-current efficiency (ABPE) of the BiVO4/CuO electrode was also ∼2.5-fold higher than the BiVO4 electrode. Loading of CuO over the BiVO4 surface improved the light absorption ability of the electrode in the entire UV–vis region, leading to generation of a greater number of photoinduced charge carriers, and it also enhanced the reactive sites for water oxidation as per the calculation of double-layer capacitance (C dl). The formation of inner electric field (IEF) at the interface between BiVO4 and CuO offered well-separated electron–hole pairs in association with improvement in the lifetime of charge carriers, and as a consequence, the BiVO4/CuO electrode showed a transient decay time of 4.45 s, which was ∼1.6-fold higher than the BiVO4 electrode (2.81 s). The formation of p–n junction between BiVO4 and CuO significantly reduced the charge transfer resistance (R ct) at the electrode/electrolyte interface (EEI), and as a result, the BiVO4 and BiVO4/CuO electrodes show R ct values of 454.4 and 201.9 Ω, respectively, under light illumination. Moreover, the Bode phase analysis confirmed quick hole consumption in the presence of the BiVO4/CuO electrode over the pristine BiVO4 electrode during water oxidation process. Overall, the formation of a p–n junction facilitated well-separated electron–hole pairs and improved the hole transfer at the EEI for an efficient PEC water oxidation process.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO₄ Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Murugan

Pandikumar

2022

ACS Appl. Energy Mater.

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“…The electrode potential reported in the results and discussion was converted to a RHE . The applied bias photon-to-current efficiency (ABPE), the band gaps ( E g ), and the charge carrier density ( N D ) of the photoanodes were calculated according to previous reports. − …”

Section: Methodsmentioning

confidence: 99%

Modulation of Photogenerated Carrier Transport by Integration of Sb₂O₃ with Fe₂O₃ for Improved Photoelectrochemical Water Oxidation

Chen

Pan

et al. 2022

ACS Appl. Energy Mater.

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Optimization of photogenerated carrier transport by heterojunction engineering has been realized as an effective strategy to improve the electrode performance in photoelectrochemical (PEC) systems. We report for the first time a type II heterostructure consisting of Sb2O3 and Fe2O3 for significantly enhanced PEC water oxidation. The as-fabricated photoanode exhibits prominent performance with a photocurrent density as high as 1.31 mA cm–2 at 1.23 V (vs. reversible hydrogen electrode), 14.5 times that of bare Fe2O3, as well as remarkable applied bias photon-to-current efficiency (10.7 times that of Fe2O3) and long-term stability (over 20 h). Notably, it outperforms all the Sb2O3-based photoanodes reported to date. The excellent PEC performance is ascribed to the rational integration of the matched merits of different components, i.e., interleaved step energy bands and complementary band gaps of Sb2O3 and Fe2O3. Along with the enhanced electrical conductivity, the photogenerated carriers are capable of flowing to the desired direction at a fast migration rate for participating in redox reactions on the electrode surface, and the electron–hole recombination is simultaneously efficiently inhibited.

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“…Although the type-II heterojunction is beneficial to the separation and transport of carriers, it is not negligible that it still cannot offset the ultrafast recombination of electrons and holes . Therefore, the development of a more reasonable heterojunction structure is desired, and the p–n heterojunction structure has received increasing attention. − For n-type semiconductor BiVO 4 , it is feasible to couple with a p-type semiconductor to form the p–n heterojunction. Near the interface between BiVO 4 and the p-type semiconductor as a result of the charge transfer between the p-type semiconductor and BiVO 4 , there forms an internal electric field .…”

Section: Modification Of Bivo4 For Pec Water Splittingmentioning

confidence: 99%

Visible Light Photoanode Material for Photoelectrochemical Water Splitting: A Review of Bismuth Vanadate

et al. 2022

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Photoelectrochemical (PEC) technology for water splitting has been regarded as one of the most appealing and environmentally friendly approaches to converting light energy into hydrogen energy. The semiconductor material used as the photoelectrode is considered to be the most important factor affecting the efficiency of the PEC system. Bismuth vanadate (BiVO 4 ), as a n-type semiconductor material, has a wide light absorption range, strong catalytic ability, high stability, and low cost, which makes it one of the most promising candidates as a photoanode material for PEC water splitting. Since the first report of BiVO 4 , tremendous efforts have been devoted to exploring different strategies for the synthesis and structural modification of BiVO 4 to enhance its PEC performance, which has led to remarkable progress in recent years. This review attempts to summarize such considerable progress of BiVO 4 for PEC water splitting, mainly focusing on the synthetic methods and modification strategies. In the end, the personal perspectives on the challenges and opportunities of this promising material are proposed.

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Fe2O3 nanorods/CuO nanoparticles p-n heterojunction photoanode: Effective charge separation and enhanced photoelectrochemical properties

Cited by 48 publications

References 51 publications

Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO₄ Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO₄ Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Modulation of Photogenerated Carrier Transport by Integration of Sb₂O₃ with Fe₂O₃ for Improved Photoelectrochemical Water Oxidation

Visible Light Photoanode Material for Photoelectrochemical Water Splitting: A Review of Bismuth Vanadate

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Fe2O3 nanorods/CuO nanoparticles p-n heterojunction photoanode: Effective charge separation and enhanced photoelectrochemical properties

Cited by 48 publications

References 51 publications

Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO4 Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO4 Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Modulation of Photogenerated Carrier Transport by Integration of Sb2O3 with Fe2O3 for Improved Photoelectrochemical Water Oxidation

Visible Light Photoanode Material for Photoelectrochemical Water Splitting: A Review of Bismuth Vanadate

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Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO₄ Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Reinforcement of Visible-Light Harvesting and Charge-Transfer Dynamics of BiVO₄ Photoanode via Formation of p–n Heterojunction with CuO for Efficient Photoelectrocatalytic Water Splitting

Modulation of Photogenerated Carrier Transport by Integration of Sb₂O₃ with Fe₂O₃ for Improved Photoelectrochemical Water Oxidation