Activity and Stability Boosting of an Oxygen‐Vacancy‐Rich BiVO<sub>4</sub> Photoanode by NiFe‐MOFs Thin Layer for Water Oxidation

Pan, Jinbo; Wang, Binghao; Wang, Jin‐Bo; Ding, Hongzhi; Zhou, Wei; Li, Xuan; Zhang, Jinrong; Shen, Sheng; Guo, Jinsong; Chen, Lang; Au, Chak Tong; Jiang, Lilong; Yin, Shuang‐Feng

doi:10.1002/ange.202012550

Cited by 42 publications

(24 citation statements)

References 56 publications

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“…Interestingly, the excellent applied bias photo-to-current efficiency (ABPE) of FeOOH/Ni-N 4 -O/BiVO 4 photoanode records 2.66% at 0.54 V vs RHE, which is 5.43 times higher than that of BiVO 4 (Figure e). This record ABPE of FeOOH/Ni-N 4 -O/BiVO 4 photoanode is higher than the reported values for BiVO 4 /FeOOH/NiOOH (1.75%), FeCoO x /BiVO 4 (1.16%), NiO/CoO x /BiVO 4 (1.5%), β-FeOOH/BiVO 4 (0.71%), PW 9 Co/BiVO 4 (0.84%), B-BiVO 4 (1.1%), CQDs/FeOOH/BiVO 4 (0.6%), NiFe-MOFs/O v -BiVO 4 (1.62%), Co 4 O 4 cubane/BiVO 4 (1.84%), Co@CB[5]/BiVO 4 (1.79%), Co-Pi/GCN/BiVO 4 (1.28%), Fe 2 O 3 /RGO/BiV 1– x Mo x O 4 (0.17%), etc. (Figure f).…”

Section: Resultscontrasting

confidence: 64%

Engineering Single-Atomic Ni-N₄-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

et al. 2021

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Direct photoelectrochemical (PEC) water splitting is a promising solution for solar energy conversion; however, there is a pressing bottleneck to address the intrinsic charge transport for the enhancement of PEC performance. Herein, a versatile coupling strategy was developed to engineer atomically dispersed Ni-N 4 sites coordinated with an axial direction oxygen atom (Ni-N 4 -O) incorporated between oxygen evolution cocatalyst (OEC) and semiconductor photoanode, boosting the photogenerated electron−hole separation and thus improving PEC activity. This state-ofthe-art OEC/Ni-N 4 -O/BiVO 4 photoanode exhibits a record high photocurrent density of 6.0 mA cm −2 at 1.23 V versus reversible hydrogen electrode (vs RHE), over approximately 3.97 times larger than that of BiVO 4 , achieving outstanding long-term photostability. From X-ray absorption fine structure analysis and density functional theory calculations, the enhanced PEC performance is attributed to the construction of single-atomic Ni-N 4 -O moiety in OEC/BiVO 4 , facilitating the holes transfer, decreasing the free energy barriers, and accelerating the reaction kinetics. This work enables us to develop an effective pathway to design and fabricate efficient and stable photoanodes for feasible PEC water splitting application.

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Section: Resultscontrasting

confidence: 64%

Engineering Single-Atomic Ni-N₄-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

et al. 2021

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“…As shown in Figure f, the ESR signal intensity at g = 2.002 for BiVO 4 /a-NiFeMo was much higher after CV treatment, demonstrating an increased unpaired electron trapped at the oxygen vacancies. Both the increased oxidation state of Ni and the increased ratio of O V and O OH could be attributed to the in situ formed oxy(hydroxide) layer during the CV treatment, which was suggested to be the active species for the transition-metal-based catalyst with superior OER performance. − It was also generally suggested that the increased density of oxygen vacancies facilitated the oxygen evolution reaction. , Therefore, the in situ activation of the BiVO 4 /a-NiFeMo photoanode was attributed to the rapid surface reconstruction of the surface-loaded a-NiFeMo cocatalyst during the CV treatment, which led to favorable electronic and geometric structure for higher OER performance.…”

Section: Resultsmentioning

confidence: 99%

“…57−60 It was also generally suggested that the increased density of oxygen vacancies facilitated the oxygen evolution reaction. 61,62 Therefore, the in situ activation of the BiVO 4 /a-NiFeMo photoanode was attributed to the rapid surface reconstruction of the surface-loaded a-NiFeMo cocatalyst during the CV treatment, which led to favorable electronic and geometric structure for higher OER performance. The effect of the in situ activation process can be quantitively illustrated by comparing the electrochemical active surface area (ECSA) of the BiVO 4 /a-NiFeMo photoanode before and after CV treatment.…”

Section: Resultsmentioning

confidence: 99%

In Situ Activation of Amorphous NiFeMo Oxide Cocatalyst To Improve the Photoelectrochemical Water Splitting Performance of BiVO₄

Gao

Tian

Zhu

et al. 2021

ACS Appl. Energy Mater.

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Amorphous NiFeMo oxides (a-NiFeMo) synthesized via a simple supersaturated coprecipitation method are explored as a cocatalyst to improve the photoelectrochemical water splitting performance of BiVO 4 . The performance of the composite photoelectrode is found to be further enhanced through a cyclic-voltammetry-related in situ activation process, and a photocurrent of 5.0 mA/cm 2 is achieved at 1.23 V RHE with improved photoelectrochemical stability. X-ray photoelectron spectroscopy (XPS), Raman, and electron spin resonance (ESR) characterization results indicate that the surface-loaded a-NiFeMo cocatalyst undergoes a rapid surface reconstruction during the in situ activation process, which results in an incorporation of phosphate ions in the surface-loaded a-NiFeMo, along with an increased oxidation state of Ni ions and enriched oxygen vacancies. These combined effects lead to an improved oxygen evolution reaction performance and finally result in a reduced charge-transfer resistance at the solid/liquid interface, causing the interfacial charge-injection efficiency to be enormously enhanced from the original 25.1% in pure BiVO 4 to 83.3% in BiVO 4 /a-NiFeMo after being in situ activated. Our result indicates that the rapid surface-reconstruction phenomenon shown in the amorphous materials may provide a promising strategy for designing a highly efficient cocatalyst for photoelectrodes.

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“…(3) constructing heterostructures or core-shell structure [331]; (4) ultraviolet light-induced regeneration [332].…”

Section: Summary Challenges and Future Perspectives In Defect-engineered N 2 Photocatalysismentioning

confidence: 99%

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

et al. 2021

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Engineering of defects in semiconductors provides an effective protocol for improving photocatalytic N2 conversion efficiency. This review focuses on the state-of-the-art progress in defect engineering of photocatalysts for the N2 reduction toward ammonia. The basic principles and mechanisms of thermal catalyzed and photon-induced N2 reduction are first concisely recapped, including relevant properties of the N2 molecule, reaction pathways, and NH3 quantification methods. Subsequently, defect classification, synthesis strategies, and identification techniques are compendiously summarized. Advances of in situ characterization techniques for monitoring defect state during the N2 reduction process are also described. Especially, various surface defect strategies and their critical roles in improving the N2 photoreduction performance are highlighted, including surface vacancies (i.e., anionic vacancies and cationic vacancies), heteroatom doping (i.e., metal element doping and nonmetal element doping), and atomically defined surface sites. Finally, future opportunities and challenges as well as perspectives on further development of defect-engineered photocatalysts for the nitrogen reduction to ammonia are presented. It is expected that this review can provide a profound guidance for more specialized design of defect-engineered catalysts with high activity and stability for nitrogen photochemical fixation.

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Activity and Stability Boosting of an Oxygen‐Vacancy‐Rich BiVO₄ Photoanode by NiFe‐MOFs Thin Layer for Water Oxidation

Cited by 42 publications

References 56 publications

Engineering Single-Atomic Ni-N₄-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

Engineering Single-Atomic Ni-N₄-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

In Situ Activation of Amorphous NiFeMo Oxide Cocatalyst To Improve the Photoelectrochemical Water Splitting Performance of BiVO₄

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

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Activity and Stability Boosting of an Oxygen‐Vacancy‐Rich BiVO4 Photoanode by NiFe‐MOFs Thin Layer for Water Oxidation

Cited by 42 publications

References 56 publications

Engineering Single-Atomic Ni-N4-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

Engineering Single-Atomic Ni-N4-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

In Situ Activation of Amorphous NiFeMo Oxide Cocatalyst To Improve the Photoelectrochemical Water Splitting Performance of BiVO4

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

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Product

Resources

About

Activity and Stability Boosting of an Oxygen‐Vacancy‐Rich BiVO₄ Photoanode by NiFe‐MOFs Thin Layer for Water Oxidation

Engineering Single-Atomic Ni-N₄-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

Engineering Single-Atomic Ni-N₄-O Sites on Semiconductor Photoanodes for High-Performance Photoelectrochemical Water Splitting

In Situ Activation of Amorphous NiFeMo Oxide Cocatalyst To Improve the Photoelectrochemical Water Splitting Performance of BiVO₄