Monolayer carbon-encapsulated Mo-doped Ni nanoparticles anchored on single-wall carbon nanotube film for total water splitting

Majeed, Abdul; Li, Xin; Hou, Peng‐Xiang; Tabassum, Hassina; Zhang, Lili; Liu, Chang; Cheng, Hui‐Ming

doi:10.1016/j.apcatb.2020.118823

Cited by 48 publications

(16 citation statements)

References 33 publications

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“…Especially, in the synthesis of a core-shell structure, the uniformity of nanoparticles, the thickness of the shell can be well controlled to reach the ideal target by adjusting the parameters and the feeding. [115,144,145] CVD remains one of the reproducible and fast synthetic techniques to get NPM-based core@carbon shell electrocatalysts.…”

Section: Gas-phase Synthesismentioning

confidence: 99%

Confinement Effects in Individual Carbon Encapsulated Nonprecious Metal‐Based Electrocatalysts

Shen

Ying

Ozoemena

et al. 2021

Adv Funct Materials

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The evolution of cost-effective and reserve-rich nonprecious metals (NPMs) to replace precious metal electrocatalysts is of significant interest in modern electrocatalysis. The confinement effects in NPM-based nanoparticles encapsulated in carbon nanoshells have been considered as an emerging and efficient way to special types of electrocatalysts which facilitate electrocatalytic activity and stability, even under rigorous conditions. This review focuses on the unique individual carbon encapsulation for high-performance design of NPM-based electrocatalysts, outlining all confinement synthesis methods, mechanistic studies on confinement effects, and the emerging practical reactions. It begins first introducing the synthetic methods for NPM-based core@carbon shell electrocatalysts, and then follows clarification of the relationship between the fundamental confinement effects and the performance improvement of carbon shell encapsulating NPM-based electrocatalysts. Further and detailed discussions on the alloying effect, doping effect, and heterojunction effect of the NPM-based core to alter the electronic situation which affects the electrocatalytic performance are subsequently provided. Finally, the review provides a perspective on challenges and opportunities in future research with respect to both in-depth theoretical research and potential design concept of such NPM-based core@carbon shell electrocatalysts.

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Section: Gas-phase Synthesismentioning

confidence: 99%

Confinement Effects in Individual Carbon Encapsulated Nonprecious Metal‐Based Electrocatalysts

Shen

Ying

Ozoemena

et al. 2021

Adv Funct Materials

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“…In these hybrid materials, conductive graphitized layers not only provide a seat of decoration for transition metal alloy nanoparticles but also provide added conductivity and enhancement of active sites in the form of dangling bonds or defects. In this regard, Majeed et al [16] have shown Ni and Mo doped Ni encapsulation by thin carbon layers with simultaneous decoration on nitrogen doped SWCNTs for better OER/HER activities in alkaline media. In our previous reports, [17] we have also demonstrated the growth of unique morphology MWCNTs, graphitic carbon nanofibers (GNFs), carbon onions, platelet GNFs-CNT and graphene CNT hybrids for OER/HER activities.…”

Section: Introductionmentioning

confidence: 99%

^“In‐Situ Grown Nickel‐Cobalt (NiCo) Alloy Nanoparticles Decorated on Petal‐Like Nitrogen‐Doped Carbon Spheres for Efficient OER Activity^”**

et al. 2022

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Herein, we report in-situ NiCo alloy nanoparticle formation of extremely small diameter (1-5 nm) on nitrogen (N)-doped carbon spheres by the CVD method at 750 °C temperature, followed by its use in oxygen evolution reaction (OER) electrocatalysis. Secondary electron microscope (SEM) imaging shows the open as well as close cup-shaped spheres and discs, while transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies confirmed the ultrafine NiCo alloy particles' formation on nitrogen-doped multilayer graphitized carbon. Moreover, Raman spectroscopy revealed the I D /I G ratio to be about 1.57 for N-doped graphitic multilayer carbon, thereby suggesting the defective nature of graphitized carbon material, which may possibly be due to the incorporation of nitrogen atoms into graphitic carbon layers. The formation of extremely small NiCo alloy nanoparticles is attributed to the reducing carbonaceous environment of CVD constituted by ethanol and acetonitrile precursors, while carbon spheres/disks seem to be catalysed by silica substrate originated from an alcogel catalyst. In addition, synthesised hybrid nanocomposites materials were tested for OER electrocatalysis in alkaline conditions and it was found that synthesized NiCo alloy nanoparticles decorated on N-doped carbon spheres have an overpotential 310 mV at current density of 10 mA/cm 2 which is just 5 mV higher than that of benchmark Ir/C (20 wt % Ir) electrocatalyst. The multiphase components of synthesised material like; electrically conductive carbon, nitrogen-doped sites and well-separated ultrafine NiCo alloy nanoparticles synergistically contributed towards better OER activity in alkaline conditions.

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“…3 Hydrogen energy was considered as one of the most promising and efficient energy sources, 4,5 which can replace the traditional fossil energy because of its higher energy density and zero pollution emission. 6 Generally speaking, the water electrolysis strategy is one of the most efficient ways to produce hydrogen energy, which is composed of the anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) [7][8][9][10] and is sought aer and loved by many researchers. 11,12 However, as the most important half-reaction of the anode of water electrolysis, oxygen evolution reaction (OER) has sluggish kinetics and is complicated by a four-electron transferring process (4OH À / 2H 2 O + O 2 + 4e À ), which seriously hinders the conversion and application of hydrogen energy process.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, by changing the anode reaction urea oxidation reaction (UOR), the price of hydrogen energy can be effectively dropped. 8 For well over the last few years now, transition metal hydroxides (nanoparticles) have been widely used in OER due to their excellent electrocatalytic properties in alkaline media. So far, many different types of nanoparticles have been synthesized, such as NiCo nanoparticles, [14][15][16] NiFe nanoparticles, [17][18][19] CoFe nanoparticles 20 and so on.…”

Section: Introductionmentioning

confidence: 99%

A three-dimensional nanostructure of NiFe(OH)_X nanoparticles/nickel foam as an efficient electrocatalyst for urea oxidation

Yang

et al. 2021

RSC Adv.

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Monolayer carbon-encapsulated Mo-doped Ni nanoparticles anchored on single-wall carbon nanotube film for total water splitting

Cited by 48 publications

References 33 publications

Confinement Effects in Individual Carbon Encapsulated Nonprecious Metal‐Based Electrocatalysts

Confinement Effects in Individual Carbon Encapsulated Nonprecious Metal‐Based Electrocatalysts

^“In‐Situ Grown Nickel‐Cobalt (NiCo) Alloy Nanoparticles Decorated on Petal‐Like Nitrogen‐Doped Carbon Spheres for Efficient OER Activity^”**

A three-dimensional nanostructure of NiFe(OH)_X nanoparticles/nickel foam as an efficient electrocatalyst for urea oxidation

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Monolayer carbon-encapsulated Mo-doped Ni nanoparticles anchored on single-wall carbon nanotube film for total water splitting

Cited by 48 publications

References 33 publications

Confinement Effects in Individual Carbon Encapsulated Nonprecious Metal‐Based Electrocatalysts

Confinement Effects in Individual Carbon Encapsulated Nonprecious Metal‐Based Electrocatalysts

“In‐Situ Grown Nickel‐Cobalt (NiCo) Alloy Nanoparticles Decorated on Petal‐Like Nitrogen‐Doped Carbon Spheres for Efficient OER Activity”**

A three-dimensional nanostructure of NiFe(OH)X nanoparticles/nickel foam as an efficient electrocatalyst for urea oxidation

Contact Info

Product

Resources

About

^“In‐Situ Grown Nickel‐Cobalt (NiCo) Alloy Nanoparticles Decorated on Petal‐Like Nitrogen‐Doped Carbon Spheres for Efficient OER Activity^”**

A three-dimensional nanostructure of NiFe(OH)_X nanoparticles/nickel foam as an efficient electrocatalyst for urea oxidation