Rational design of Schottky heterojunction with modulating surface electron density for high-performance overall water splitting

Deng, Lequan; Zhang, Kang; Shi, Danni; Liu, Shengfu; Xu, Deqin; Shao, Yongliang; Shen, Jianxing; Wu, Yongzhong; Hao, Xiaopeng

doi:10.1016/j.apcatb.2021.120660

Cited by 77 publications

(41 citation statements)

References 48 publications

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“…Meanwhile, the binding energy of P reduces by 0.4 eV after V incorporation, indicating the increased electron cloud density around P sites in VÀ CoP 2 . [40] There observations can be ascribed to the fact that V with multiple valences can manipulate the valence state and electronic structure of Co element, [41,42] making electron-rich Co transfer electrons to P. In consequence, Co loses electrons leading to higher binding energy, whereas P acquires electrons generating lower binding energy. The above results indicate that V incorporation alters the crystal environment and electronic structure of CoP 2 , which could regulate the adsorption behavior of reactive intermediates, thus promoting catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, the peak positions of Co element in the V−CoP 2 shift towards higher binding energy (0.5 eV) in comparison with those of CoP 2 . Meanwhile, the binding energy of P reduces by 0.4 eV after V incorporation, indicating the increased electron cloud density around P sites in V−CoP 2 [40] . There observations can be ascribed to the fact that V with multiple valences can manipulate the valence state and electronic structure of Co element, [41, 42] making electron‐rich Co transfer electrons to P. In consequence, Co loses electrons leading to higher binding energy, whereas P acquires electrons generating lower binding energy.…”

Section: Resultsmentioning

confidence: 99%

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Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Wang

Jiao

et al. 2022

Angewandte Chemie

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Proton exchange membrane water electrolyzer (PEMWE) in acidic media is a hopeful scenario for hydrogen production by using renewable energy sources, but the grand challenge lies in substituting active and stable noble-metal catalysts. Herein, a robust electrocatalyst of V-CoP2 porous nanowires arranged on carbon cloth is successfully fabricated via incorporating vanadium into CoP2 lattice. Structural characterizations and theoretical analysis indicate that lattice expansion of CoP2 caused by V incorporation results in the upshift of d-band center, which is conducive to hydrogen adsorption for boosting HER activity. Besides, V promotes surface reconstruction to generate a thicker Co3O4 layer that enhances acid-corrosion resistance and optimizes the adsorption of water and oxygen-containing species, thus improving OER activity and stability. Accordingly, it presents a superior acidic overall water splitting activity (1.47 V@10 mA cm -2 ) over Pt-C/CC||RuO2/CC, and remarkable stability. This work proposes a new route to design efficient electrocatalysts via lattice engineering for PEMWE.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Wang

Jiao

et al. 2022

Angewandte Chemie

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“…It is worth mentioning that one of the first reports, in 1983, on the electrocatalytic performance of metal hydroxides, revealed a good OER activity of α-Ni(OH) 2 [57], and it was further confirmed that the Fe impurities in the α-Ni(OH) 2 greatly lower the OER overpotential [58,59]. Since then, the LDHs of 3d iron group metals (Fe, Co and Ni)-such as Ni-Fe [60][61][62][63][64], Ni-Co [65][66][67][68], Co-Ni [69][70][71], Fe-Ni [72][73][74], Fe-Co [75][76][77][78], and Co-Co [79][80][81][82]-and the corresponding derivatives-e.g., NiFe 2 O 4 [83][84][85][86], CoFe 2 O 4 [87], NiCo 2 O 4 [88,89], and Co 3 O 4 [90][91][92]-have been employed as OER or bifunctional ORR/OER electrocatalysts with high kinetics in alkaline solution.…”

Section: Introductionmentioning

confidence: 93%

Recent Progress on Transition Metal Based Layered Double Hydroxides Tailored for Oxygen Electrode Reactions

et al. 2021

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The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), namely, so-called oxygen electrode reactions, are two fundamental half-cell reactions in the energy storage and conversion devices, e.g., zinc–air batteries and fuel cells. However, the oxygen electrode reactions suffer from sluggish kinetics, large overpotential and complicated reaction paths, and thus require efficient and stable electrocatalysts. Transition-metal-based layered double hydroxides (LDHs) and their derivatives have displayed excellent catalytic performance, suggesting a major contribution to accelerate electrochemical reactions. The rational regulation of electronic structure, defects, and coordination environment of active sites via various functionalized strategies, including tuning the chemical composition, structural architecture, and topotactic transformation process of LDHs precursors, has a great influence on the resulting electrocatalytic behavior. In addition, an in-depth understanding of the structural performance and chemical-composition-performance relationships of LDHs-based electrocatalysts can promote further rational design and optimization of high-performance electrocatalysts. Finally, prospects for the design of efficient and stable LDHs-based materials, for mass-production and large-scale application in practice, are discussed.

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“…The Tafel slope values of the W x V 1-x Se 2 nanoplates array were ≈80 mV dec -1 . Due to the enriched active sites, the unique nanosheets of Fe,Rh-Ni 2 P/NF reached the current density of 10 mA cm −2 at a low voltage of 1.62 V. [366] It has been realized that the self-driven charge transfer properties of P-CoFe-LDH@MXene/NF can enhance electron transport efficiency, resulting in excellent overall water splitting at a low cell voltage of 1.52 V. [367] Likewise, active sites enriched cobalt-molybdenum nitride nanosheet arrays grown on Ni foam (CoMoN x NSAs/NF) required the HER and OER overpotentials of 91 and 231 mV, respectively to reach the current density of 10 mA cm −2 . [368] In addition, when the CoMoN x NSAs/NF was used as a bifunctional electrode, it reached the current density of 10 mA cm −2 at a low cell voltage of 1.55 V.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

Chandrasekaran

Khandelwal

Fan

et al. 2022

Advanced Energy Materials

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Ni, Fe, and Cu foams to form robust binder-free electrodes for high-performance electrocatalytic reactions. [55][56][57][58][59] Interestingly, multidimensional electrocatalysts grown at the nanoscale on a range of current collectors, namely substrates and will benefit from a strong adhesion with the current collector to avoid catalyst delamination, limited active sites, and charge transfer blockage to enhance catalytic reactions (Figure 1b-d). [9,[60][61][62][63][64] Key Prospects, Insights, and the Dynamic Properties of Nano-and Microstructured Binder-Free Electrocatalysts and Their Direct Impact on Electrochemical ReactionsWater splitting has become one of the most important technologies to produce hydrogen (H 2 ) in high purity form. Water splitting includes two half-reactions, namely the cathodic HER and anodic OER. [8,65] Generally, the electrocatalytic performance and activity are highly sensitive to local reaction conditions and is largely valued by the energy required for adsorption/desorption of reaction intermediates and the rupture/creation of chemical bonds. Hence, the conventional powder form of precious metals such as Pt/C for the HER and RuO 2 or IrO 2 for the OER are considered ideal electrocatalysts. [66] In addition, several nonprecious 1D, 2D, and 3D nano-and microstructured powder catalysts such as MoS 2 , WS 2 , Ni 3 S 2 , NiCo 2 S 4 are also of interest for the HER and OER reactions. [54,[67][68][69][70][71][72][73][74] However, for commercial purposes and practical applica-

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Rational design of Schottky heterojunction with modulating surface electron density for high-performance overall water splitting

Cited by 77 publications

References 48 publications

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Recent Progress on Transition Metal Based Layered Double Hydroxides Tailored for Oxygen Electrode Reactions

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

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Rational design of Schottky heterojunction with modulating surface electron density for high-performance overall water splitting

Cited by 77 publications

References 48 publications

Vanadium‐Incorporated CoP2 with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Vanadium‐Incorporated CoP2 with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Recent Progress on Transition Metal Based Layered Double Hydroxides Tailored for Oxygen Electrode Reactions

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

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Product

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Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting