Sandwich structured WO<sub>3</sub> nanoplatelets for highly efficient photoelectrochemical water splitting

Zheng, Guangwei; Wang, Jinshu; Zu, Guannan; Che, Haibing; Lai, Chen; Li, Hongyi; Murugadoss, Vignesh; Yan, Chao‐Guo; Fan, Jincheng; Guo, Zhanhu

doi:10.1039/c9ta09188b

Cited by 85 publications

(35 citation statements)

References 92 publications

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“…[ 21b,26 ] Double‐layer capacitances ( C dl ) were typically calculated to determine the electrochemical surface areas (ECSA). [ 27 ] Based on the cyclic voltammograms (CVs) at different scan rates (Figure 3d; Figure S13, Supporting Information), the C dl of NiS 0.5 Se 0.5 is determined to be 110.5 mF cm −2 , which is highest among the synthesized catalysts (63.3, 95.5, 81.1, and 45.9 mF cm −2 for NiSe, NiS 0.23 Se 0.77 , NiS 0.76 Se 0.24 , and NiS, respectively), signaling the largest electrochemically active area of NiS 0.5 Se 0.5 . In order to study the intrinsic activities, the polarization curves in Figure 3a were then normalized by ECSA values (Figure S14, Supporting Information), suggesting that the normalized HER activity of NiS 0.5 Se 0.5 was still better than those of other samples.…”

Section: Figurementioning

confidence: 99%

Lattice‐Strain Engineering of Homogeneous NiS_0.5Se_0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

et al. 2020

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obstacles: the slow kinetics, the short operation lifespan of electrodes, and the high price of noble-metal catalysts. [2] Thus, developing low-cost, high-efficiency and robust electrocatalysts for overall water splitting is exceptionally urgent. [3] At present, transition metal compounds (TMCs), with earth-abundant nature, versatile redox valence, and unsaturated transition metal sites, have been widely investigated for overall water splitting. However, the intrinsically poor activity and unsatisfied stability greatly hinder their practical applications. [4] Tuning electronic structure is regarded to be an efficient strategy to enhance the activity of electrocatalysts. Strain engineering is one of the promising routes to manipulate the electronic structure by modifying the distances of atoms and in turn favoring the catalytic activity improvement. [5] Previous studies have suggested that by introducing only 1% strain, the d band center can be shifted by ≈0.1 eV, leading to the enhanced binding strengthen between catalytically active sites and surface adsorbates. [5a,6] At present, lattice mismatch, substrate induced and heteroatom substitution are three common strategies for introducing lattice strain. [7] Lattice Developing highly efficient non-noble-metal electrocatalysts for water splitting is crucial for the development of clean and reversible hydrogen energy. Introducing lattice strain is an effective strategy to develop efficient electrocatalysts. However, lattice strain is typically co-created with heterostructure, vacancy, or substrate effects, which complicate the identification of the strainactivity correlation. Herein, a series of lattice-strained homogeneous NiS x Se 1−x nanosheets@nanorods hybrids are designed and synthesized by a facile strategy. The NiS 0.5 Se 0.5 with ≈2.7% lattice strain exhibits outstanding activity for hydrogen and oxygen evolution reaction (HER/OER), affording low overpotentials of 70 and 257 mV at 10 mA cm −2 , respectively, as well as excellent long-term durability even at a large current density of 100 mA cm −2 (300 h), significantly superior to other benchmarks and precious-metal catalysts. Experimental and theoretical calculation results reveal that the generated lattice strain decreases the metal d-orbital overlap, leading to a narrower bandwidth and a closer d-band center toward the Fermi level. Thus, NiS 0.5 Se 0.5 possesses favorable H* adsorption kinetics for HER and lower energy barriers for OER. This work provides a new insight to regulate the lattice strain of advanced catalyst materials and further improve the performance of energy conversion technologies.

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Section: Figurementioning

confidence: 99%

Lattice‐Strain Engineering of Homogeneous NiS_0.5Se_0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

et al. 2020

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“…Because of the complex process and loose contact between the 2D nanostructure and the substrate, the top‐down strategies are rarely applied to prepare 2D photoanodes. The bottom‐up methods usually use precursor solutions to grow high‐quality 2D metal oxide/sulfide materials on a conductive substrate directly, including hydrothermal, [ 11 ] solvothermal, [ 44 ] chemical bath deposition (CBD), [ 45 ] and seed layer epitaxial growth. [ 46 ] The hydrothermal/solvothermal method is a common method to fabricate 2D metal oxide/sulfide PEC photoanodes.…”

Section: D Semiconductor Photoanode In Pec Water Splittingmentioning

confidence: 99%

“…In the past decade, various semiconductors have been applied as photoanodes for PEC water splitting. According to the chemical compositions, these semiconductors can be divided into metal oxides (TiO 2 , [ 10 ] WO 3 , [ 11 ] Fe 2 O 3 , [ 12 ] etc. ), metal sulfides (SnS 2 , [ 13 ] ZnIn 2 S 4 , [ 14 ] CdS, [ 15 ] etc.…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

Tian

2020

Solar RRL

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The utilization of solar energy plays a vital role in relieving energy crisis and associated environmental problems. Photoelectrochemical (PEC) water splitting, which can directly transform solar energy into clean hydrogen energy, is one of the most promising strategies to utilize solar energy. 2D nanostructured metal oxides/sulfides have been widely applied as photoanodes in PEC cells due to their unique configuration and features, which can efficiently improve light absorption, enlarge electrode/electrolyte contacting interfaces, and promote carrier transfer and injection. This article begins with the introduction of performance parameters, carrier dynamics measurement, and mechanism exploration techniques for photoanodes, which is followed by an overview of research progress in using 2D nanostructure metal oxides/sulfides to fabricate efficient photoanodes for PEC water splitting. Subsequently, the recent representative strategies to optimize the PEC performance of 2D metal oxides/sulfides photoanodes, including structure engineering, defect engineering, element doping, heterojunction construction, and surface modification, are summarized. Finally, the exciting advances and future research directions for designing highly efficient 2D photoanodes are provided.

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“…33,34 In conventional liquid-solid diphase reaction systems, the low dissolution and slow mass transfer of the N 2 and CO 2 in electrolytes seriously restrict the reaction kinetics. Besides, the un-wanted hydrogen evolution reaction (HER) [35][36][37][38] will hinder the faradaic efficiency and/or the selectivity of the NRR and CRR. These limitations can be addressed using the air-liquid-solid triphase electrode.…”

Section: N 2 and Co 2 Reduction Reactions With The Triphase Interfacementioning

confidence: 99%

Enhanced catalytic reaction at an air–liquid–solid triphase interface

Chen

Feng

2020

Chem. Sci.

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Sandwich structured WO₃ nanoplatelets for highly efficient photoelectrochemical water splitting

Abstract: Promising PEC water splitting activity with a photocurrent density of 3.16 mA cm−2 at 1.23 V vs. RHE was demonstrated in sandwich structured WO3 with exposed highly reactive (002) facet and superior crystallinity of 2-D nanoplatelets.

Cited by 85 publications

References 92 publications

Lattice‐Strain Engineering of Homogeneous NiS_0.5Se_0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

Lattice‐Strain Engineering of Homogeneous NiS_0.5Se_0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

Enhanced catalytic reaction at an air–liquid–solid triphase interface

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Sandwich structured WO3 nanoplatelets for highly efficient photoelectrochemical water splitting

Abstract: Promising PEC water splitting activity with a photocurrent density of 3.16 mA cm−2 at 1.23 V vs. RHE was demonstrated in sandwich structured WO3 with exposed highly reactive (002) facet and superior crystallinity of 2-D nanoplatelets.

Cited by 85 publications

References 92 publications

Lattice‐Strain Engineering of Homogeneous NiS0.5Se0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

Lattice‐Strain Engineering of Homogeneous NiS0.5Se0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

Enhanced catalytic reaction at an air–liquid–solid triphase interface

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Product

Resources

About

Sandwich structured WO₃ nanoplatelets for highly efficient photoelectrochemical water splitting

Lattice‐Strain Engineering of Homogeneous NiS_0.5Se_0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting

Lattice‐Strain Engineering of Homogeneous NiS_0.5Se_0.5 Core–Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting