One-step controllable fabrication of 3D structured self-standing Al3Ni2/Ni electrode through molten salt electrolysis for efficient water splitting

Hua, Zhongsheng; Wu, Xiaobin; Zhu, Zhiyuan; He, Jiwen; He, Shiwei; Liu, Huan; Xu, Liang; Yang, Yongxiang; Zhao, Zhuo

doi:10.1016/j.cej.2021.131743

Cited by 22 publications

(5 citation statements)

References 72 publications

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“…Due to low cost, ease of manipulation, ease of preparation, and biodegradability, low-eutectic solvents derived by mixing halide salts with hydrogen bond donors have attracted widespread attention. DES, as an emerging medium, has recently demonstrated the ability to prepare functional materials with specific structures and properties. − Zhao et al prepared nanosheets of a high-entropy metal phosphide (CrMnFeCoNi) x P using a low-eutectic solvent method. The nanosheets were tested for hydrogen evolution electrocatalytic activity in a 0.1 M KOH solution, achieving a current density of 10 mA cm –2 with an overpotential of 136 mV .…”

Section: Introductionmentioning

confidence: 99%

Deep Eutectic Solvent-Assisted Corrosion Boosting Bulk FeCoNiCrMo High-Entropy Alloys as Highly Efficient Oxygen Evolution Reaction Catalyst

Xu,

Chen,

Zhou

et al. 2024

Langmuir

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The key to enhancing water electrolysis efficiency lies in selecting highly efficient catalysts. Currently, high-entropy alloys (HEAs) are utilized in electrocatalysis applications owing to their diverse elemental composition, disordered elemental distribution, and the high solubility of each element, endowing them with excellent catalytic performance. The experiments were conducted using isoatomic FeNiCrMo HEA as a precursor, with a high-activity three-dimensional nanoporous structure rapidly synthesized via electrochemical one-step dealloying in a choline chloride-thiourea (ChCl-TU) deep eutectic solvent (DES). The results indicate that the dealloyed Fe 20 Co 20 Ni 20 Cr 20 Mo 20 HEA mainly consists of two phases: face-centered cubic and σ phases. The imbalance in the distribution of elements in these two phases leads to quite different corrosion speeds with the FCC phase being preferentially corroded. Furthermore, synergistic electron coupling between surface atoms in the three-dimensional nanoporous structure strengthens the behavior of the oxygen evolution reaction (OER). At a current density of 40 mA cm −2 , the overpotential after dealloying decreased to 370 mV, demonstrating excellent stability. The technique demonstrated in this work provides a novel approach to improve the catalytic activity of OER.

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Section: Introductionmentioning

confidence: 99%

Deep Eutectic Solvent-Assisted Corrosion Boosting Bulk FeCoNiCrMo High-Entropy Alloys as Highly Efficient Oxygen Evolution Reaction Catalyst

Xu,

Chen,

Zhou

et al. 2024

Langmuir

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“…[24] For example, molten-salt electrolysis (MSE) could favor the controllable synthesis of compositions, structures, and morphologies under relatively mild conditions, perhaps an effective pathway to attain heterostructuring and nanostructuring simultaneously. [25,26] In this work, we prepared Co 2 B/MoB 2 heterostructured electrocatalyst by MSE for efficient pH-universal hydrogen evolution. The compositional, structural, and morphological properties of Co 2 B/MoB 2 catalysts were adjusted by altering the stoichiometries of raw materials and the synthesis temperatures.…”

Section: Introductionmentioning

confidence: 99%

Molten‐Salt Electrochemical Preparation of Co₂B/MoB₂ Heterostructured Nanoclusters for Boosted pH‐Universal Hydrogen Evolution

Liu,

Yao,

et al. 2023

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Boosting the hydrogen evolution reaction (HER) activity of α‐MoB2 at large current densities and in pH‐universal medium is significant for efficient hydrogen production. In this work, Co2B/MoB2 heterostructured nanoclusters are prepared by molten‐salt electrolysis (MSE) and then used as a HER catalyst. The composition, structure, and morphology of Co2B/MoB2 can be modulated by altering the stoichiometries of raw materials and synthesis temperatures. Impressively, the obtained Co2B/MoB2 at optimized conditions exhibits a low overpotential of 297 and 304 mV at 500 mA cm−2 in 0.5 m H2SO4 and 1 m KOH, respectively. Moreover, the Co2B/MoB2 catalyst possesses a long‐term catalytic stability of over 190 h in both acidic and alkaline medium. The excellent HER performance is due to the modified electronic structure at the Co2B/MoB2 heterointerface where electrons are accumulated at the Mo sites to strengthen the H adsorption. Density functional theory (DFT) calculations reveal that the formation of the Co2B/MoB2 heterointerface decreases the H adsorption and H2O dissociation free energies, contributing to the boosted HER intrinsic catalytic activity of Co2B/MoB2. Overall, this work provides an experimental and theoretical paradigm for the design of efficient pH‐universal boride heterostructure electrocatalysts.

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“…Moreover, powder noble-metal-based electrocatalysts need to be coated on conductive substrates, which inevitably increases the resistance and inhibits mass/charge transport. − In recent years, the development of self-supporting catalysts has received considerable attention. , The self-supporting strategy provides a fast electron-transport channel between the conductive substrates and catalysts, which accelerates the charge-transport rate, facilitates the reaction, and has made substantial progress in the field of carbon dioxide reduction and overall water electrolysis. − In addition, self-supporting materials can avoid the use of conducting binders, and excellent mechanical properties can improve their usage rate, which is a prospective strategy to promote the performance of the electrocatalyst and broaden its application range. − Hence, combining the Fe 2 O 3 nanostructure with a self-supporting strategy to prepare an integrated catalyst for electrocatalytic NO 3 RR to NH 3 is attractive.…”

Section: Introductionmentioning

confidence: 99%

In Situ Growth of Fe₂O₃ Nanorod Arrays on Carbon Cloth with Rapid Charge Transfer for Efficient Nitrate Electroreduction to Ammonia

Tang

et al. 2022

ACS Appl. Mater. Interfaces

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Electrochemical reduction of nitrate to ammonia (NH3), a green NH3 production route upon combining with renewable energy sources, is an appealing and alternative method to the Haber–Bosch process. However, this process not only involves the complicated eight-electron reduction to transform nitrate into various nitrogen products but simultaneously suffers from the competitive hydrogen evolution reaction, challenged by a lack of efficient catalysts. Herein, the in situ growth of Fe2O3 nanorod arrays on carbon cloth (Fe2O3 NRs/CC) is reported to exhibit a high NH3 yield rate of 328.17 μmol h–1 cm–2 at −0.9 V versus RHE, outperforming most of the reported Fe catalysts. An in situ growth strategy provides massive exposed active sites and a fast electron-transport channel between the carbon cloth and Fe2O3, which accelerates the charge-transport rate and facilitates the conversion of nitrate to NH3. In situ Raman spectroscopy in conjunction with attenuated total reflection Fourier transform infrared spectroscopy reveals the catalytic mechanism of nitrate to NH3. Our study provides not only an efficient catalyst for NH3 production but also useful guidelines for the pathways and mechanism of nitrate electroreduction to NH3.

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One-step controllable fabrication of 3D structured self-standing Al3Ni2/Ni electrode through molten salt electrolysis for efficient water splitting

Cited by 22 publications

References 72 publications

Deep Eutectic Solvent-Assisted Corrosion Boosting Bulk FeCoNiCrMo High-Entropy Alloys as Highly Efficient Oxygen Evolution Reaction Catalyst

Deep Eutectic Solvent-Assisted Corrosion Boosting Bulk FeCoNiCrMo High-Entropy Alloys as Highly Efficient Oxygen Evolution Reaction Catalyst

Molten‐Salt Electrochemical Preparation of Co₂B/MoB₂ Heterostructured Nanoclusters for Boosted pH‐Universal Hydrogen Evolution

In Situ Growth of Fe₂O₃ Nanorod Arrays on Carbon Cloth with Rapid Charge Transfer for Efficient Nitrate Electroreduction to Ammonia

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One-step controllable fabrication of 3D structured self-standing Al3Ni2/Ni electrode through molten salt electrolysis for efficient water splitting

Cited by 22 publications

References 72 publications

Deep Eutectic Solvent-Assisted Corrosion Boosting Bulk FeCoNiCrMo High-Entropy Alloys as Highly Efficient Oxygen Evolution Reaction Catalyst

Deep Eutectic Solvent-Assisted Corrosion Boosting Bulk FeCoNiCrMo High-Entropy Alloys as Highly Efficient Oxygen Evolution Reaction Catalyst

Molten‐Salt Electrochemical Preparation of Co2B/MoB2 Heterostructured Nanoclusters for Boosted pH‐Universal Hydrogen Evolution

In Situ Growth of Fe2O3 Nanorod Arrays on Carbon Cloth with Rapid Charge Transfer for Efficient Nitrate Electroreduction to Ammonia

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Product

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Molten‐Salt Electrochemical Preparation of Co₂B/MoB₂ Heterostructured Nanoclusters for Boosted pH‐Universal Hydrogen Evolution

In Situ Growth of Fe₂O₃ Nanorod Arrays on Carbon Cloth with Rapid Charge Transfer for Efficient Nitrate Electroreduction to Ammonia