Crystalline–Amorphous Ni3S2–NiMoO4 Heterostructure for Durable Urea Electrolysis-Assisted Hydrogen Production at High Current Density

Zhuo, Xiaoyan; Jiang, Wenjie; Yu, Tianqi; Qian, Guangfu; Chen, Jinli; Yang, Haifeng; Yin, Shibin

doi:10.1021/acsami.2c11238

Cited by 45 publications

(19 citation statements)

References 64 publications

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“…To verify the generation of CO 2 as one of the reaction products of UOR, a precipitation test was performed using Ba(OH) 2 •8H 2 O after the UOR stability test (Figure S12). 42 The addition of Ba(OH) 2 •8H 2 O gives a white precipitation of Ba 2 CO 3 . With addition of the HCl solution, white precipitation started dissolving in the solution with the evolution of CO 2 gas (Video S2).…”

Section: Resultsmentioning

confidence: 99%

Highly Dispersed Core–Shell Ni@NiO Nanoparticles Embedded on Carbon–Nitrogen Nanotubes as Efficient Electrocatalysts for Enhancing Urea Oxidation Reaction

et al. 2023

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Wastewater treatment and energy production are important fields of research to meet the current requirements of sustainable energy development and wastewater restoration. The urea oxidation reaction (UOR) can be used for simultaneous environmental remediation and energy production on a priority basis. Nickel−nickel oxide (Ni@NiO) core−shell NPs on carbon−nitrogen nanotubes (CNNTBs) have been synthesized as electrocatalysts by using a simple and easy aerial annealing method. Morphological analysis by high resolutiontransmission electron microscopy (HR-TEM) confirms the formation of Ni@NiO NPs on CNNTBs with an average size of ∼40 nm. Powder X-ray diffraction (XRD) confirms Ni@ NiOCN-X with a face-centered cubic (FCC) crystal structure. A BET surface area measurement suggests that annealing at 400 °C (Ni@NiOCN-4) creates a larger surface area than that of carbon−nitrogen material (CN). The electrochemical studies of the Ni@ NiOCN-4 nanocomposite reveal that it has a better electrochemical activity and ultralow onset potential with an E onset = 0.42 V Ag/AgCl and current density of 34 mA/cm 2 for a potential of 0.71 V Ag/AgCl toward urea oxidation reactions. The annealing temperature-dependent studies were found to be effective toward the morphology tunning and hence tunable catalytic performance toward urea oxidation reactions. In urea oxidation studies, chronoamperometry (i−t) and EIS analysis show that the proposed Ni@NiOCN-4 system has long-term stability and ultrafast electron transfer. This work showed a simple way for temperature-dependent morphology tuning of a catalyst with enhanced electrochemical activity for urea oxidation, which is useful for sustainable energy production utilizing urea-rich wastewater.

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Section: Resultsmentioning

confidence: 99%

Highly Dispersed Core–Shell Ni@NiO Nanoparticles Embedded on Carbon–Nitrogen Nanotubes as Efficient Electrocatalysts for Enhancing Urea Oxidation Reaction

et al. 2023

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“…chose amorphous NiMoO 4 to modify Ni 3 S 2 to construct a crystalline/amorphous heterostructure catalyst (Ni 3 S 2 ‐NiMoO 4 /NF). [ 146 ] A clear peak of Mo species could not be observed in the XRD pattern, but the characteristic peak of NiMoO 4 was detected by Raman spectroscopy. In addition, HRTEM and fast Fourier transform (FFT) spectra confirmed the existence of a clear crystalline‐amorphous interface between crystalline Ni 3 S 2 and amorphous NiMoO 4 .…”

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

mentioning

confidence: 99%

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Huang

Shuai

Zhan

et al. 2023

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Compared with the traditional electrolysis of water to produce hydrogen, urea‐assisted electrolysis of water to produce hydrogen has significant advantages and has received extensive attention from researchers. Unfortunately, urea oxidation reaction (UOR) involves a complex six‐electron transfer process leading to high overpotential, which forces researchers to develop high‐performance UOR catalysts to drive the development of urea‐assisted water splitting. Based on the UOR mechanism and extensive literature research, this review summarizes the strategies for preparing highly efficient UOR catalysts. First, the UOR mechanism is introduced and the characteristics of excellent UOR catalysts are pointed out. Aiming at this, the following modulation strategies are proposed to improve the catalytic performance based on summarizing various literature: 1) Accelerating the active phase formation to reduce initial potential; 2) Creating double active sites to trigger a new UOR mechanism; 3) Accelerating urea adsorption and promoting C─N bond cleavage to ensure the effective conduct of UOR; 4) Promoting the desorption of CO2 to improve stability and prevent catalyst poisoning; 5) Promoting electron transfer to overcome the inherent slow dynamics of UOR; 6) Increasing active sites or active surface area. Then, the application of UOR in electrochemical devices is summarized. Finally, the current deficiencies and future directions are discussed.

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“…To enhance the adsorption/desorption of intermediates, it is imperative to introduce electronic structure engineering to activate the electronic states of the catalyst, which can reduce energy barriers and strengthen structural stability . To achieve this, electronic interface state regulation of Ni 3 S 2 –NiMoO 4 and Pd 4 S–Pd 3 P 0.95 and d-band center displacements of N–NiMoO 4 /NiS 2 and Ni 2 P–Fe 2 P have been employed to effectively reduce the HER overpotential by facilitating intermediate adsorption/desorption. Metal phosphides/metal oxide nanointerfaces have been demonstrated to exhibit higher activity than metal alone. – Among various metal-based components, molybdenum (Mo) exhibits a distinctive synergetic effect with nickel (Ni) in catalyzing the HER. , Interestingly, Mo-based oxides, despite being distinct from metallic catalysts like those mentioned above, have also demonstrated activity for the HER. – For example, the nanoscale Ni/NiO@MoO 3– x composite nanoarrays with synergistically active sites facilitated intermediate desorption and exhibited a remarkable enhancement in the HER activity .…”

Section: Introductionmentioning

confidence: 99%

Synergistic Activation of Crystalline Ni₂P and Amorphous NiMoO_x for Efficient Water Splitting at High Current Densities

et al. 2023

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The overpotential of alkaline water electrolysis at high current density is significantly increased by the high energy barriers of high intermediate (H* and OH*) and slow mass/charge transfer. Modifying the electronic structure and morphology of catalysts to decrease energy barriers and enhance mass/charge transfer is a promising approach, but it presents significant challenges. In this study, the crystalline Ni 2 P clusters were coupled with an amorphous NiMoO x nanorod support on a nickel foam substrate (Ni 2 P−NiMoO x /NF) to create a heterojunction that enhances mass/charge transfer, tunes energy barriers, and improves reaction kinetics through synergistic activation. The Ni 2 P− NiMoO x /NF exhibits ultralow overpotentials of 91, 188, and 297 mV at 10, 100, and 500 mA cm −2 , respectively, for the hydrogen evolution reaction, along with stability. It also shows superior performance in the oxygen evolution reaction. Remarkably, the Ni 2 P− NiMoO x /NF-based electrolyzer achieves 100 and 400 mA cm −2 at low cell voltages of 1.66 and 2.08 V, respectively, while also maintaining stable electrolysis for 100 h under industrial testing (65 °C with 30% KOH). Additional characterization and density functional theory calculations demonstrate that the interaction between Ni 2 P and NiMoO x facilitates the downshifting of d-band centers to the Fermi level, which results in the activation of the local electronic structure, promoting H 2 O dissociation and enhancing the overall catalytic activity.

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Crystalline–Amorphous Ni₃S₂–NiMoO₄ Heterostructure for Durable Urea Electrolysis-Assisted Hydrogen Production at High Current Density

Cited by 45 publications

References 64 publications

Highly Dispersed Core–Shell Ni@NiO Nanoparticles Embedded on Carbon–Nitrogen Nanotubes as Efficient Electrocatalysts for Enhancing Urea Oxidation Reaction

Highly Dispersed Core–Shell Ni@NiO Nanoparticles Embedded on Carbon–Nitrogen Nanotubes as Efficient Electrocatalysts for Enhancing Urea Oxidation Reaction

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Synergistic Activation of Crystalline Ni₂P and Amorphous NiMoO_x for Efficient Water Splitting at High Current Densities

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Crystalline–Amorphous Ni3S2–NiMoO4 Heterostructure for Durable Urea Electrolysis-Assisted Hydrogen Production at High Current Density

Cited by 45 publications

References 64 publications

Highly Dispersed Core–Shell Ni@NiO Nanoparticles Embedded on Carbon–Nitrogen Nanotubes as Efficient Electrocatalysts for Enhancing Urea Oxidation Reaction

Highly Dispersed Core–Shell Ni@NiO Nanoparticles Embedded on Carbon–Nitrogen Nanotubes as Efficient Electrocatalysts for Enhancing Urea Oxidation Reaction

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Synergistic Activation of Crystalline Ni2P and Amorphous NiMoOx for Efficient Water Splitting at High Current Densities

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Crystalline–Amorphous Ni₃S₂–NiMoO₄ Heterostructure for Durable Urea Electrolysis-Assisted Hydrogen Production at High Current Density

Synergistic Activation of Crystalline Ni₂P and Amorphous NiMoO_x for Efficient Water Splitting at High Current Densities