Super-hydrophilic CoAl-LDH on BiVO4 for enhanced photoelectrochemical water oxidation activity

Yue, Pengfei; She, Houde; Zhang, Liang; Niu, Bin; Lian, Rui; Huang, Jingwei; Wang, Lei; Wang, Qizhao

doi:10.1016/j.apcatb.2021.119875

Cited by 148 publications

(68 citation statements)

References 47 publications

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“…which was three times higher than that of the pristine BiVO 4 (1.1 mA cm −2 at 1.23 V RHE ) photoanode with a negative onset potential shift of about 0.30 V. [80] The improved performance is mainly due to the surface wettability engineering and adequate energy level matching amongst LDH and BiVO 4 .…”

Section: Metal Oxide/hydroxide-based Cocatalystsmentioning

confidence: 89%

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Gaikwad

Suryawanshi

Ghorpade

et al. 2021

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117

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Therefore, an ever-growing demand for sustainable and environmentally-friendly energy technologies are prompting scientists to explore alternative approaches to reduce the carbon footprint. [2] Among the different sustainable energy sources, solar energy is an inexhaustible source of energy (173000 Terawatt (TW), almost 10 000 times of 17.7 TW, global energy consumption in 2020) and the largest currently available on earth with a ubiquitous distribution worldwide. [3] However, its decentralized and intermittent nature poses a great challenge to our energy needs. [4] Artificial photosynthesis, imitating a natural photosynthesis, where the harvesting of sunlight directly into chemical bonds (hydrogen, (H 2 ) fuel) is a highly promising approach to address the serious issue like air pollution, greenhouse gas emission, etc. Artificial photosynthesis by means of photoelectrochemical (PEC) water splitting has been studied extensively to split water using sunlight and semiconductor into oxygen (O 2 ) and H 2 , where the generated H 2 can be stored and transported to other energy conversion systems. [5] In recent years, PEC water splitting turned out to be an elegant and ecological way to generate clean H 2 fuel. Despite having mature and commercialized technologies, photovoltaic-electrochemical (PV-EC) water splitting systems have the most significant complications in PV designs. [6] In a photocatalytic (PC) water splitting system, on the other hand, both H 2 and O 2 are generated on the same surface of the PC particles, and hence in most cases, backward complex reactions like hydrogen oxidation reaction and oxygen reduction reaction occur quickly, lowering the solar to H 2 (STH) conversion efficiency. [7] In comparison to the PC system, the physical separation of oxidation and reduction species in PEC cells makes them more practical, effective, and safer. Moreover, the PEC cells have an electrode/electrolyte interface that performs simultaneous roles of light-harvesting and electrolysis in a single reactor. Consequently, the large-scale application of PEC cells is the most achievable, even at lower operating temperature as it opens up the opportunity to improve efficiency and reduce costs through the nature of its device structure. In particular, a recent assessment of its practicability has shown that the lifespan (i.e., stability), efficiency, and capital cost of The photoelectrochemical (PEC) cell that collects and stores abundant sunlight to hydrogen fuel promises a clean and renewable pathway for future energy needs and challenges. Monoclinic bismuth vanadate (BiVO 4 ), having an earthabundancy, nontoxicity, suitable optical absorption, and an ideal n-type band position, has been in the limelight for decades. BiVO 4 is a potential photoanode candidate due to its favorable outstanding features like moderate bandgap, visible light activity, better chemical stability, and cost-effective synthesis methods. However, BiVO 4 suffers from rapid recombination of photogenerated charge carriers that have impeded further imp...

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Section: Metal Oxide/hydroxide-based Cocatalystsmentioning

confidence: 89%

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Gaikwad

Suryawanshi

Ghorpade

et al. 2021

Small

117

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“…Photoelectrochemical (PEC) water splitting is a promising technology to obtain renewable H 2 fuel. − The more important research in PEC is focused on the development of cheap and efficient metal oxide materials. − Bismuth vanadate is one of the most promising semiconductor materials due to the favorable bandgap (2.4 eV) and suitable valence band for water splitting. , Surprisingly, its theoretical photocurrent can reach 6.8 mA/cm 2 , which is very important for practical application. − However, poor surface water oxidation kinetics along with charge recombination limits its PEC performance for application …”

Section: Introductionmentioning

confidence: 99%

Enhanced BiVO₄ Photoanode Photoelectrochemical Performance via Borate Treatment and a NiFeOx Cocatalyst

Zhang

Huang

et al. 2021

ACS Sustainable Chem. Eng.

182

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To settle the slow water oxidation kinetics and charge recombination of BiVO 4 photoanodes, boron-treated BiVO 4 combined with a NiFeOx electrocatalyst (NiFeOx/B/ BiVO 4 ) electrode is prepared. The resultant NiFeOx/B/BiVO 4 demonstrates a 5.22 mA/cm 2 current density at 1.23 V vs RHE under AM 1.5 G illumination without any sacrificial agent. Significantly, the applied bias photon-to-current efficiency of the NiFeOx/B/BiVO 4 photoanode reaches 1.96% at 0.7 V vs RHE, which is much higher than that of pristine BiVO 4 . Such excellent performance can be attributed to the existence of self-adsorbed [B(OH) 4 ] − ligands and NiFeOx electrocatalysts, enhancing the separation of photoelectron−hole pairs. This work provides a way to construct effective photocatalysts for solar water splitting.

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“…The Bi 4f core-level region is well-separated by spin–orbit components (5.8 eV), confirming the +3 oxidation state of the Bi element. The V 2p core-level XPS spectrum clearly exhibits two major peaks, which are related to the V 2p 3/2 and V 2p 1/2 at binding energies of 514.6 and 523.2 eV, respectively . The spin–orbit binding energy difference of V 2p is 8.6 eV, demonstrating that V 2p is in the +5 state.…”

Section: Resultsmentioning

confidence: 95%

“…The V 2p core-level XPS spectrum clearly exhibits two major peaks, which are related to the V 2p 3/2 and V 2p 1/2 at binding energies of 514.6 and 523.2 eV, respectively. 19 The spin−orbit binding energy difference of V 2p is 8.6 eV, demonstrating that V 2p is in the +5 state. In comparison, XPS spectra of bare BiVO 4 nanostructures are also presented in Figure S7.…”

Section: Morphological and Microstructural Studiesmentioning

confidence: 95%

Boosting Water Oxidation Performance of BiVO₄ Photoanode by Vertically Stacked NiO Nanosheets Coupled with Atomically Dispersed Iridium Sites

Reddy

Kim

Reddy

et al. 2021

ACS Appl. Energy Mater.

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Atomically dispersed oxygen evoution cocatalysts embedded on 2D metal oxide nanosheets are at the heart of the key to solar to chemical energy conversion applications. However, high photocurrent density, conversion efficiency, and durability remain grand challenges due to their photocorrosion in electrolyte solutions. To overcome these challenges, we designed a highly efficient and stable photoanode consisting of vertically stacked NiO nanosheets coupled with atomically dispersed iridium sites on a BiVO4 semiconductor as a water oxidation photoanode. A series of analyses, including scanning tunneling electron microscopy, X-ray spectroscopy, and density functional theory (DFT) calculations, demonstrated that the Ir atoms are atomically dispersed on the surface of vertically stacked NiO sheets with a favorable oxidation state and suitable band edge potentials for charge separation and transport. Owing to these properties, the designed BiVO4@NiO–Ir exhibited a stable water oxidation photocurrent of 4.33 mA·cm–2 at 1.23 V vs a reversible hydrogen electrode (RHE) under simulated solar light, which is much higher compared to those of BiVO4, BiVO4@NiO, and BiVO4@Ir photoanodes. In addition, we observed the evolution of stoichiometric amounts of oxygen and hydrogen with 96% Faradaic efficiency for greater than a 10 h duration. The DFT results showed that the potential determining step (PDS) of the oxygen evolution reaction at the BiVO4@NiO–Ir surface is only 0.68 eV compared to 1.78 eV at the BiVO4@NiO surface. The significant reduction of PDS on the order of 1 eV for BiVO4@NiO–Ir demonstrates superior photoelectrochemical (PEC) performance. We strongly believe that this work aids the design of atomically scaled nanocatalysts for solar-driven chemical fuel device applications.

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Super-hydrophilic CoAl-LDH on BiVO4 for enhanced photoelectrochemical water oxidation activity

Cited by 148 publications

References 47 publications

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Enhanced BiVO₄ Photoanode Photoelectrochemical Performance via Borate Treatment and a NiFeOx Cocatalyst

Boosting Water Oxidation Performance of BiVO₄ Photoanode by Vertically Stacked NiO Nanosheets Coupled with Atomically Dispersed Iridium Sites

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Super-hydrophilic CoAl-LDH on BiVO4 for enhanced photoelectrochemical water oxidation activity

Cited by 148 publications

References 47 publications

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO4 for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO4 for Photoelectrochemical Water Splitting

Enhanced BiVO4 Photoanode Photoelectrochemical Performance via Borate Treatment and a NiFeOx Cocatalyst

Boosting Water Oxidation Performance of BiVO4 Photoanode by Vertically Stacked NiO Nanosheets Coupled with Atomically Dispersed Iridium Sites

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Product

Resources

About

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Enhanced BiVO₄ Photoanode Photoelectrochemical Performance via Borate Treatment and a NiFeOx Cocatalyst

Boosting Water Oxidation Performance of BiVO₄ Photoanode by Vertically Stacked NiO Nanosheets Coupled with Atomically Dispersed Iridium Sites