Ni2P nanocrystals embedded Ni-MOF nanosheets supported on nickel foam as bifunctional electrocatalyst for urea electrolysis

Wang, Haitao; Zou, Haiyan; Liu, Yingying; Liu, Zhenglong; Sun, Wenshuang; Lin, Kun‐Yi Andrew; Li, Tielong; Luo, Shuangjiang

doi:10.1038/s41598-021-00776-8

Cited by 39 publications

(26 citation statements)

References 66 publications

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“…A smaller Tafel constant demonstrates a faster current increase with increasing overpotential, indicating a rapid charge transfer kinetics and a better catalytic performance . Of note, since the Tafel constant value was lower than 80 mV · dec –1 , the Heyrovsky step was proposed to be the rate-determining step (RDS) of the HER on the NiFeSbP/GB nanostructured catalyst. , Inspired by these obtained results, it is found that the NiFeSbP/GB electrode catalyst has better HER performance when deposited at a Ni/Fe ratio of 2.5:1. To provide more insights into the surface kinetics, electrochemical impedance spectroscopy (EIS) was performed.…”

Section: Resultsmentioning

confidence: 76%

Hierarchical Flower-like NiFeSbP Electrocatalyst toward Efficient and Stable Urea-Assisted Electrolytic Hydrogen Production

Gugtapeh

Rezaei

2022

ACS Appl. Energy Mater.

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Designing high-performance electrocatalysts for water splitting and urea-assisted electrolysis is of great significance in the hydrogen production industry. Herein, a hierarchical flower-like NiFeSbP electrocatalyst with different Ni/Fe ratios was fabricated on a graphite bar (GB) through a one-step electrodeposition method. By optimizing and regulating the ratios of Ni and Fe in the composition, the NiFeSbP electrocatalyst exhibited excellent hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and urea oxidation reaction (UOR) activities with overpotentials of 143, 323, and 272 mV at 100 mA·cm–2, sequentially, and also demonstrated longevity for over 100 h in an alkaline solution. More impressively, a symmetrical electrolyzer using NiFeSbP/GB as both the anode and cathode to afford a current density of 10 mA·cm–2 needs 1.72 V for overall water splitting and 1.54 V for urea-assisted electrolysis. The superior catalytic performances of the NiFeSbP/GB catalyst in the urea-added water electrolysis mainly benefit from the synergistic effect between tricomponent metal catalytic centers (Ni, Fe, and Sb) and P atoms, which modulates the chemical and electronic structure of the catalyst. This work opens up new prospects for the rational design of versatile and stable UOR electrocatalysts for hydrogen generation in an efficient manner.

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Section: Resultsmentioning

confidence: 76%

Hierarchical Flower-like NiFeSbP Electrocatalyst toward Efficient and Stable Urea-Assisted Electrolytic Hydrogen Production

Gugtapeh

Rezaei

2022

ACS Appl. Energy Mater.

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“…The insertion of the Ni 2 P nanoparticles on the surface of the NiO wall-like nanosheets resulted in five new peaks at 40.8°, 47.9°, 54.6°, 55.2°, and 73.8° accredited to the (111), (210), (300), (211), and (311) planes of Ni 2 P (JCPDS No. 03–0953) ( Figure 4 B) [ 46 , 47 ]. The intensity of the NiO diffraction peaks was slightly diminished due to the phosphidation process.…”

Section: Resultsmentioning

confidence: 99%

Ni2P Nanoparticle-Inserted Porous Layered NiO Hetero-Structured Nanosheets as a Durable Catalyst for the Electro-Oxidation of Urea

Wang

Kannan

et al. 2022

Nanomaterials

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The electro-oxidation of urea (EOU) is a remarkable but challenging sustainable technology, which largely needs a reduced electro-chemical potential, that demonstrates the ability to remove a notable harmful material from wastewater and/or transform the excretory product of humans into treasure. In this work, an Ni2P-nanoparticle-integrated porous nickel oxide (NiO) hetero-structured nanosheet (Ni2P@NiO/NiF) catalyst was synthesized through in situ acid etching and a gas-phase phosphating process. The as-synthesized Ni2P@NiO/NiF catalyst sample was then used to enhance the electro-oxidation reaction of urea with a higher urea oxidation response (50 mA cm−2 at 1.31 V vs. RHE) and low onset oxidation potential (1.31 V). The enhanced activity of the Ni2P@NiO/NiF catalyst was mainly attributed to effective electron transport after Ni2P nanoparticle insertion through a substantial improvement in active sites due to a larger electrochemical surface area, and a faster diffusion of ions occurred via the interactive sites at the interface of Ni2P and NiO; thus, the structural reliability was retained, which was further evidenced by the low charge transfer resistance. Further, the Ni2P nanoparticle insertion process into the NiO hetero-structured nanosheets effectively enabled a synergetic effect when compared to the counter of the Ni2P/NiF and NiO/NiF catalysts. Finally, we demonstrate that the as-synthesized Ni2P@NiO/NiF catalyst could be a promising electrode for the EOU in urea-rich wastewater and human urine samples for environmental safety management. Overall, the Ni2P@NiO/NiF catalyst electrode combines the advantages of the Ni2P catalyst, NiO nanosheet network, and NiF current collector for enhanced EOU performance, which is highly valuable in catalyst development for environmental safety applications.

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“…Numerous efforts have been made by researchers to develop Ni-based catalysts by using MOF precursors. Recently, Wang et al [ 108 ] reported the preparation of Ni 2 P embedded Ni-MOF nanosheets (Ni 2 P@Ni–MOF/NF) through a direct phosphidation process, with the nanosheet directly used as a bifunctional electrocatalyst. They found that the overpotential was only 66 mV for the HER at 10 mA cm −2 and 1.41 V for the UOR at 100 mA cm −2 .…”

Section: Bifunctional Electrocatalysts For the Uor And Hermentioning

confidence: 99%

Recent Development of Nickel-Based Electrocatalysts for Urea Electrolysis in Alkaline Solution

Anuratha

Rinawati

et al. 2022

Nanomaterials

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Recently, urea electrolysis has been regarded as an up-and-coming pathway for the sustainability of hydrogen fuel production according to its far lower theoretical and thermodynamic electrolytic cell potential (0.37 V) compared to water electrolysis (1.23 V) and rectification of urea-rich wastewater pollution. The new era of the “hydrogen energy economy” involving urea electrolysis can efficiently promote the development of a low-carbon future. In recent decades, numerous inexpensive and fruitful nickel-based materials (metallic Ni, Ni-alloys, oxides/hydroxides, chalcogenides, nitrides and phosphides) have been explored as potential energy saving monofunctional and bifunctional electrocatalysts for urea electrolysis in alkaline solution. In this review, we start with a discussion about the basics and fundamentals of urea electrolysis, including the urea oxidation reaction (UOR) and the hydrogen evolution reaction (HER), and then discuss the strategies for designing electrocatalysts for the UOR, HER and both reactions (bifunctional). Next, the catalytic performance, mechanisms and factors including morphology, composition and electrode/electrolyte kinetics for the ameliorated and diminished activity of the various aforementioned nickel-based electrocatalysts for urea electrolysis, including monofunctional (UOR or HER) and bifunctional (UOR and HER) types, are summarized. Lastly, the features of persisting challenges, future prospects and expectations of unravelling the bifunctional electrocatalysts for urea-based energy conversion technologies, including urea electrolysis, urea fuel cells and photoelectrochemical urea splitting, are illuminated.

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Ni2P nanocrystals embedded Ni-MOF nanosheets supported on nickel foam as bifunctional electrocatalyst for urea electrolysis

Cited by 39 publications

References 66 publications

Hierarchical Flower-like NiFeSbP Electrocatalyst toward Efficient and Stable Urea-Assisted Electrolytic Hydrogen Production

Hierarchical Flower-like NiFeSbP Electrocatalyst toward Efficient and Stable Urea-Assisted Electrolytic Hydrogen Production

Ni2P Nanoparticle-Inserted Porous Layered NiO Hetero-Structured Nanosheets as a Durable Catalyst for the Electro-Oxidation of Urea

Recent Development of Nickel-Based Electrocatalysts for Urea Electrolysis in Alkaline Solution

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