Cobalt vanadium layered double Hydroxide/FeOOH heterostructure catalyst with strong electron interactions for stable oxygen evolution performance

Wang, Zhipeng; Chen, Liang; Xu, Shoudong; Zhang, Ding; Zhou, Xiaowen; Wu, Xu; Xie, Xianmei; Qiu, Xiangyun

doi:10.1016/j.coco.2021.100780

Cited by 20 publications

(10 citation statements)

References 28 publications

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“…23 Although there was some positive progress in the research of FeOOH compounds with LDH based materials, there were still few articles about composites based on MOFs coupled with FeOOH and the corresponding OER performance. [24][25][26] Encouraged by the above discussion, defect-rich porous Ni MOF nanosheets compounded with amorphous FeOOH nanoparticles were constructed via a simple electrodeposition method in this work. Thereafter, the electrocatalytic properties of the obtained composite were systematically investigated.…”

Section: Introductionmentioning

confidence: 99%

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Amorphous FeOOH nanoparticles decorated on defect-rich porous Ni MOF nanosheet based hierarchical architectures toward superior OER performance

Yao

Pei

et al. 2022

New J. Chem.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Amorphous FeOOH nanoparticles decorated on defect-rich porous Ni MOF nanosheet based hierarchical architectures toward superior OER performance

Yao

Pei

et al. 2022

New J. Chem.

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“…4a, the binding energy of Co(OH)2 at 782.08 eV corresponded to Co 2+ . For CoV-LDHs, the characteristic peak shifted to low binding energy, indicating that the introduction of V (3d 3 4s 2 ) perturbs the electron environment around Co (3d 7 4s 2 ) atom and thus increases the valence state of Co 23,24 . Meanwhile, V 2p spectra of CoV-LDHs in Fig.…”

Section: Resultsmentioning

confidence: 99%

Cobalt-Vanadium Layered Double Hydroxides Nanosheets as High-Performance Electrocatalysts for Urea Oxidation Reaction

Liu¹,

Wang²,

Liu³

et al. 2022

Acta Physico Chimica Sinica

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Hydrogen is considered as a desirable clean energy source for supporting human life in the future. Electrochemical water splitting is a promising method for generating carbon-free hydrogen. However, the relatively high overpotential of anodic oxygen evolution reaction (OER) is the main obstacle hindering the widespread popularity of water electrocatalysis technology. Recently, urea oxidation reaction (UOR) has gained significant attention as a potential alternative to OER for hydrogen production since the equilibrium potential of UOR is 0.86 V lower than that of OER. Transition metal-based layered double hydroxides (TM-LDHs) have been explored as promising UOR electrocatalysts, with the advantages of diversified metal species, stable twodimensional layered structure and exchangeability of interlayer anions. To date, most studies have focused on TM-LDHs of late transition metals (e.g., Ni, Co, and Fe). In this work, by combining early and late transition metals, CoV-LDHs nanosheets were fabricated via a simple one-step coprecipitation method as high-performance UOR electrocatalysts. Additionally, cobalt hydroxide (Co(OH)2), with a similar lamellar structure, was synthesized via the same method. When compared with Co(OH)2, CoV-LDHs nanosheets exhibited better UOR performance owing to the following advantages: 1) The nanosheet structure of the as-fabricated CoV-LDHs electrocatalyst exposed a high number of active sites for the electrocatalytic conversion of urea. 2) The introduction of V enhanced the wettability of the CoV-LDHs electrocatalyst; thus, increasing its intrinsic electrocatalytic kinetics. 3) The d-electron compensation effect between Co (3d 7 4s 2 ) and V (3d 3 4s 2 ) was conducive to promoting the adsorption of urea. Therefore, the CoV-LDHs electrocatalyst exhibited a low electrochemical potential (1.52 V vs. the reversible hydrogen electrode, RHE) to achieve a current density of 10 mA•cm -2 in 1 mol•L −1 of potassium hydroxide containing 0.33 mol•L −1 urea, which was 70 mV less than that of Co(OH)2. The Tafel slope value of the CoV-LDHs electrocatalyst (99.9 mV•dec −1 ) was lower than that of Co(OH)2 (115.9 mV•dec −1 ), indicating faster UOR kinetics over the CoV-LDHs electrocatalyst. Furthermore, the CoV-LDHs electrocatalyst displayed high stability, with a negligible potential increase after a 10-h chronopotentiometry test by maintaining the current density of 10 mA•cm −2 . In conclusion, the present work not only shows that the d-electron compensation effect between early and late transition metals could adjust the local electronic structure of TM-LDHs to improve the UOR efficiency, but also provides a feasible route to design dedicated nanostructured TM-LDHs as high-performance UOR electrocatalysts.

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“…As we can see, Pd 3d 3/2 binding energies of the different catalysts decrease gradually with the increase of the Cu content, indicating that electron transfer occurred between Pd and Cu. 33,34 Therefore, the Cu shell of the Pd/Cu core/shell ico could improve the tolerance ability of *CO intermediates, thereby accelerating the CO 2 reduction kinetics. In addition, as show in the Nyquist plot (Figure S19), Pd 2.2 Cu ico/C has a smaller charge transfer resistance than Pd ico/C, indicating its faster charge transfer process in CO 2 reduction.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Strain-Regulated Pd/Cu Core/Shell Icosahedra for Tunable Syngas Electrosynthesis from CO₂

Zhang

Bai

et al. 2022

Chem. Mater.

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Introducing surface strain into catalysts would optimize the adsorption energy and surface electronic structure, but it is rarely used in the carbon dioxide reduction reaction (CO 2 RR) to regulate syngas. Herein, we have demonstrated a new class of Pd/Cu core/shell icosahedra (ico) with a tensile-strained Cu shell for efficient syngas production with tunable compositions from the CO 2 RR for the first time. By tuning the composition of Pd/Cu from 2.2 to 4.3 and 6.1, the molar ratio of H 2 /CO in syngas on Pd/ Cu core/shell ico could be tuned from 1/1 to 2/1 and 3/1, respectively. The variable selectivity of the CO 2 RR on Pd/Cu core/shell ico originated from the tensile-strained Cu shell, which synergistically optimizes the binding energy of the intermediate and the electronic structure of catalysts. The work reveals how surface strain regulation accelerates electrocatalytic performance at the molecular level, providing new strategies to regulate CO 2 RR performance.

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Cobalt vanadium layered double Hydroxide/FeOOH heterostructure catalyst with strong electron interactions for stable oxygen evolution performance

Cited by 20 publications

References 28 publications

Amorphous FeOOH nanoparticles decorated on defect-rich porous Ni MOF nanosheet based hierarchical architectures toward superior OER performance

Amorphous FeOOH nanoparticles decorated on defect-rich porous Ni MOF nanosheet based hierarchical architectures toward superior OER performance

Cobalt-Vanadium Layered Double Hydroxides Nanosheets as High-Performance Electrocatalysts for Urea Oxidation Reaction

Strain-Regulated Pd/Cu Core/Shell Icosahedra for Tunable Syngas Electrosynthesis from CO₂

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Cobalt vanadium layered double Hydroxide/FeOOH heterostructure catalyst with strong electron interactions for stable oxygen evolution performance

Cited by 20 publications

References 28 publications

Amorphous FeOOH nanoparticles decorated on defect-rich porous Ni MOF nanosheet based hierarchical architectures toward superior OER performance

Amorphous FeOOH nanoparticles decorated on defect-rich porous Ni MOF nanosheet based hierarchical architectures toward superior OER performance

Cobalt-Vanadium Layered Double Hydroxides Nanosheets as High-Performance Electrocatalysts for Urea Oxidation Reaction

Strain-Regulated Pd/Cu Core/Shell Icosahedra for Tunable Syngas Electrosynthesis from CO2

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Strain-Regulated Pd/Cu Core/Shell Icosahedra for Tunable Syngas Electrosynthesis from CO₂