Sulfuration of hierarchical Mn-doped NiCo LDH heterostructures as efficient electrocatalyst for overall water splitting

Xia, Wei; Luan, Xiaoxu; Zhang, Wei; Wu, Dengfeng

doi:10.1016/j.ijhydene.2023.03.447

Cited by 18 publications

(3 citation statements)

References 49 publications

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“…Efficient electrostatic materials were fabricated with better electrical conductivity, richer surface structure, and higher stability and flexibility than conventional substrate materials. Self-supporting structural systems give them richer means of modification [33,34]. Ni 2 Co-LDH@C showed the SEM of two-dimensional rodlike morphology (Figure 2a,b), and aggregated Ni 2 Co-LDH particles were observed on the surface of carbonized silk (Figure 2c).…”

Section: Characterization Of Electrocatalystsmentioning

confidence: 99%

Highly Effective Electrochemical Water Splitting with Enhanced Electron Transfer between Ni2Co Layered Double Hydroxide Nanosheets Dispersed on Carbon Substrate

Wan,

Tang,

Dai

et al. 2023

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A reasonable design of nickel-based catalysts is key to efficient and sustainable energy conversion. For electrocatalytic materials in alkaline electrolytes, however, atomic-level control of the active sites is essential. Moreover, the well-defined surface structure contributes to a deeper understanding of the catalytic mechanism. Here, we report the loading of defective nickel–cobalt layered double hydroxide nanosheets (Ni2Co-LDH@C) after carbonization of silk. Under the precise regulation of the local coordination environment of the catalytic active site and the presence of defects, Ni2Co-LDH@C can provide an ultra-low overpotential of 164.8 mV for hydrogen evolution reactions (HERs) at 10 mA cm−2, exceeding that of commercial Pt/C catalysts. Density functional theory calculations show that Ni2Co-LDH@C optimizes the adsorption energy of the intermediate and promotes the O-O coupling of the active site in the oxygen evolution reaction. When using Ni2Co-LDH@Cs as cathodes and anodes to achieve overall water splitting, a low voltage of 1.63 V is required to achieve a current density of 10 mA cm−2. As an ideal model, Ni2Co-LDH@C has excellent water splitting properties and has the potential to develop water–alkali electrocatalysts.

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Section: Characterization Of Electrocatalystsmentioning

confidence: 99%

Highly Effective Electrochemical Water Splitting with Enhanced Electron Transfer between Ni2Co Layered Double Hydroxide Nanosheets Dispersed on Carbon Substrate

Wan,

Tang,

Dai

et al. 2023

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“…18–20 For this reason, some research work has proposed many facile methods, such as adjusting the elemental ratio or modification with other transition metals such as manganese, to enhance the catalytic activity of Ni-based electrocatalysts. 21–25 In addition, since surface superhydrophilicity is of vital significance for improving the electrolyte wetting of materials and reaction activity, fabricating superhydrophilic materials is seen as an extremely effective approach to promote catalytic activity. 26,27…”

Section: Introductionmentioning

confidence: 99%

Electrolyzing spent cupronickel to fabricate superhydrophilic electrocatalysts for enhanced water splitting

Liu,

Wang,

Kong

et al. 2024

Dalton Trans.

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“…EWS is a process that involves the simultaneous conversion of water into hydrogen and oxygen through reduction of protons and oxidation of hydroxide ions or water molecules by utilizing effective electrocatalysts . Numerous electrocatalysts have been used including metal oxides/hydroxides, , metal chalcogenides, − metal carbides, metal phosphides, , and metal–organic frameworks . Among the various materials investigated for efficient water splitting, metal chalcogenides have emerged as a class of compounds with remarkable properties, including their high earth abundance, electronic band structures, outstanding redox reversibility, catalytic activity, and stability under harsh electrochemical conditions.…”

Section: Introductionmentioning

confidence: 99%

Optimally Generated Active Sites on Nanostructured Nickel Sulfide Electrocatalysts for Designing Economical Electrolyzers

Khairy,

Liu,

Long

2024

ACS Appl. Energy Mater.

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Development of electrocatalysts is an obstacle in the way of designing durable and low-cost water splitting systems. Thus, particular attention should be paid to researching the catalyst design phase, functionality, and active sites to reduce the activation of potential barriers. Herein, we report a straightforward one-pot hydrothermal method for the fabrication of highly efficient electrocatalysts, leveraging control over sulfur source concentrations. The resulting porous nickel sulfide (Ni x S y ) superstructures exhibit distinctive flower-and petal-like morphologies synthesized using thiourea (TU) and thiosulfate (TS), respectively. Notably, Ni x S y (TS) demonstrates exceptional electrocatalytic activity for the hydrogen evolution reaction, achieving a low overpotential of 118 mV in 1.0 M KOH at 10 mA/cm 2 . Conversely, Ni x S y (TU) exhibits high electrocatalytic activity for the oxygen evolution reaction, with a low overpotential of 188 mV. The TS route facilitates the formation of an oxidative Ni 3 S 2 heterostructure, while TU leads to the development of mixed nickel sulfide nanocrystals including nickel ions with higher oxidation states. The resulting electrocatalysts, characterized by an open porous network, rich heterogeneous interfaces, abundant exposed active sites, and electronic interactions, demonstrate outstanding performance in overall water splitting. Integration of optimized NF/TUS5 and NF/ TSS2 (NF, nickel foam) achieves remarkable current densities of 10 mA/cm 2 at 1.546 V and 50 mA/cm 2 at 1.86 V, sustaining for 22 h without significant degradation. This study offers promising insights for the development of cost-effective electrocatalysts based on metal chalcogenides, advancing the prospects for overall water-splitting applications.

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Sulfuration of hierarchical Mn-doped NiCo LDH heterostructures as efficient electrocatalyst for overall water splitting

Cited by 18 publications

References 49 publications

Highly Effective Electrochemical Water Splitting with Enhanced Electron Transfer between Ni2Co Layered Double Hydroxide Nanosheets Dispersed on Carbon Substrate

Highly Effective Electrochemical Water Splitting with Enhanced Electron Transfer between Ni2Co Layered Double Hydroxide Nanosheets Dispersed on Carbon Substrate

Electrolyzing spent cupronickel to fabricate superhydrophilic electrocatalysts for enhanced water splitting

Optimally Generated Active Sites on Nanostructured Nickel Sulfide Electrocatalysts for Designing Economical Electrolyzers

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