Constructing micro-nano rod-shaped iron-molybdenum oxide heterojunctions to enhance overall water electrolysis

Vijayapradeep, Subramanian; Kumar, Ramasamy Santhosh; Karthikeyan, S.C.; Ramakrishnan, Shanmugam; Yoo, Dong Jin

doi:10.1016/j.mtchem.2024.101934

Cited by 9 publications

(1 citation statement)

References 136 publications

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“…However, there are few studies on regulating the adsorption strength of intermediates in the electrolytic water reaction toward HEAs. Water electrolysis is usually a multielectron-transfer reaction of intermediates associated with oxygen, so it is of great significance to modulate the adsorption behavior of oxygen-containing species on the catalyst surface. − Rare earth (RE) is widely used in catalysis, especially as a heterogeneous catalyst, due to its rich electronic energy levels and high oxygen affinity. − By introducing RE into high-entropy alloys, the combination of the metal and key intermediate is modulated to balance the adsorption strength of reaction intermediates on the surface of high-entropy alloys, which accelerates the adsorption kinetics of key oxygen-containing intermediates and thus improves the reaction activity. As a matter of fact, REs play an important role in the study of electrocatalytic reactions due to their special localization of 4f electrons and incomplete filling physical and chemical properties, including abundant electron energy level structure and variable coordination number.…”

Section: Introductionmentioning

confidence: 99%

Stimulating Electron Delocalization of Lanthanide Elements through High-Entropy Confinement to Promote Electrocatalytic Water Splitting

Jiang,

Liang,

Liu

et al. 2024

ACS Nano

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High-entropy alloys (HEAs) have aroused extensive attention in the field of catalysis. However, due to the integration of multiple active sites in HEA, it exhibits excessive adsorption behavior resulting in difficult desorption of active species from the catalyst surfaces, which hinders the catalytic efficiency. Therefore, adjusting the adsorption strength of the active site in HEA to enhance the catalytic activity is of great importance. By introducing rareearth (RE) elements into the high-entropy alloy, the delocalization of 4f electrons can be achieved through the interaction between the multimetal active site and RE, which benefits to regulate the adsorption strength of the HEA surface. Herein, the RE Ce-modified hexagonal-close-packed PtRuFeCoNiZn-Ce/C HEAs are synthesized and showed an excellent electrocatalytic activity for hydrogen evolution reaction and oxygen evolution reaction with ultralow overpotentials of 4, 7 and 156, 132 mV, respectively, to reach 10 mA cm −2 in 0.5 M H 2 SO 4 and 1.0 M KOH solutions, and the assembled water electrolysis cell only requires a voltage of 1.43 V to reach 10 mA cm −2 , which is much better than the performance of PtRuFeCoNiZn/C. Combined with the results of in situ attenuated total reflection infrared spectroscopy and density functional theory (DFT), the fundamental reasons for the improvement of catalyst activity come from two aspects: (i) local lattice distortion of HEA caused by the introduction of RE with large atomic radius induces 4f orbital electron delocalization of RE elements and enhances electron exchange between RE and active sites. (ii) The electronegativity difference between the RE element and the active site forms a surface dipole in HEA, which optimizes the adsorption of the active intermediate by the HEA surface site. This study provides an insightful idea for the rational design of high-performance HEA-and RE-based electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Stimulating Electron Delocalization of Lanthanide Elements through High-Entropy Confinement to Promote Electrocatalytic Water Splitting

Jiang,

Liang,

Liu

et al. 2024

ACS Nano

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Block copolymer-mediated synthesis of TiO2/RuO2 nanocomposite for efficient oxygen evolution reaction

KC,

Kumar,

Bastakoti

2024

J Mater Sci

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An amphiphilic block copolymer, poly (styrene-2-polyvinyl pyridine-ethylene oxide), was used as a structure-directing and stabilizing agent to synthesize TiO2/RuO2 nanocomposite. The strong interaction of polymers with metal precursors led to formation of a porous heterointerface of TiO2/RuO2. It acted as a bridge for electron transport, which can accelerate the water splitting reaction. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction analysis of TiO2/RuO2 samples revealed successful fabrication of TiO2/RuO2 nanocomposites. The TiO2/RuO2 nanocomposites were used to measure electrochemical water splitting in three-electrode systems in 0.1-M KOH. Electrochemical activities unveil that TiO2/RuO2-150 nanocomposites displayed superior oxygen evolution reaction activity, having a low overpotential of 260 mV with a Tafel slope of 80 mVdec−1. Graphical abstract

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Modulating electronic by construction WS2/WN heterostructure coupled with N-doped carbon to boost alkaline seawater hydrogen production

Zhao,

Li,

Jiang

et al. 2025

Applied Surface Science

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Constructing micro-nano rod-shaped iron-molybdenum oxide heterojunctions to enhance overall water electrolysis

Cited by 9 publications

References 136 publications

Stimulating Electron Delocalization of Lanthanide Elements through High-Entropy Confinement to Promote Electrocatalytic Water Splitting

Stimulating Electron Delocalization of Lanthanide Elements through High-Entropy Confinement to Promote Electrocatalytic Water Splitting

Block copolymer-mediated synthesis of TiO2/RuO2 nanocomposite for efficient oxygen evolution reaction

Modulating electronic by construction WS2/WN heterostructure coupled with N-doped carbon to boost alkaline seawater hydrogen production

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