Co2Ni alloy/N-doped CNTs composite as efficient hydrogen evolution reaction catalyst in alkaline medium

Jia, Yu; Gao, Xuehui; Teng, Changqing; Li, Xiaoyu; Liu, Yi; Zhi, Mingjia; Hong, Zhanglian

doi:10.1016/j.jallcom.2019.03.330

Cited by 36 publications

(12 citation statements)

References 41 publications

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“…Besides, the NiWO 4 precursors also showed a large overpotential value (265 mV), implying the vital role of the W–Ni electronic interactions in the synergistic effect of the enhanced alkaline HER activity. Encouragingly, the WNi 4 @W–WO 2 sample exhibited a markedly high alkaline HER activity with a low overpotential at 10 mA/cm 2 (η 10 = 83 mV), which is much more superior than those of previously reported alloy catalysts, − and even being competitive to the commercial Pt/C catalyst (η 10 = 48 mV) (Figure a,c). Besides, in order to eliminate the influence of the substrate, the polarization curves of WNi 4 @W–WO 2 powder loading onto glassy carbon electrode (GCE) and carbon film were also collected in 1 M KOH electrolyte, respectively (electrode fabrication seen in experiment details).…”

Section: Resultsmentioning

confidence: 70%

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

et al. 2021

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The alkaline electrocatalytic hydrogen evolution can produce clean and high-purity hydrogen gas that meets sustainable demands. Metal oxides supported transition metal alloys (e.g., WNi 4 @WO x , MoNi 4 @MoO x ) can work in synergy to alter the sluggish kinetics of alkaline HER electrocatalysis. However, to date the formation mechanism of the metal alloys extracted from nickel tungstate/molybdate precursors is unclear. Moreover, the synergistic effects of W/Mo and Ni atoms were solely based on the density functional theory calculations, and no sufficient practical evidence can support the results of the simulations. Here, we demonstrate the formation mechanism of WNi 4 @W−WO 2 using in situ variable temperature near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) measurements. The as-obtained WNi 4 @W−WO 2 heterostructures exhibited markedly high alkaline HER performance with a low overpotential (83 mV) at 10 mA/cm 2 and a small Tafel slope (83 mV/dec). The quasi in situ alkaline HER electrocatalysis determined that the enhanced mechanism of alkaline HER activity can be attributed to the synergistic effects of the neighboring W and Ni atoms. This work paves a feasible route for designing desired transition metal alloy catalysts toward highly efficient alkaline HER electrocatalysis and the elucidation of the catalytic mechanism.

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Section: Resultsmentioning

confidence: 70%

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

et al. 2021

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“…Pyridinic-N and graphitic-N play a vital role during the ORR/OER process, prompting oxygen adsorption while decreasing the overpotential due to their superior electron-accepting capability. , Figure E and F display the core-level scan spectrum of element Co and Ni, respectively. A low-energy band at 778.6 eV and a high-energy band at 793.3 eV corresponding to Co 2p 3/2 and Co 2p 1/2 along with two satellites can be attributed to metallic Co. A small portion of the oxide state of Co 2+ can also be found at 780.7 and 796.6 eV, mainly due to the surface oxidation and existence of CoO x species, which has been widely reported in the literature. ,, The same situation happens to metallic Ni, where the Ni 2p 3/2 peak is located at 853.3 eV and the Ni 2p 1/2 peak is determined at 870.0 eV. ,, The presence of Ni 2+ at 855.2 and 872.8 eV results from surface oxidation of the metal . It is reported that surface defect sites with low oxygen coordination can lead to the enhancement of OER, which further provides synergistic effect together with CoNi alloy …”

Section: Resultsmentioning

confidence: 55%

“…40,41 the surface oxidation and existence of CoO x species, which has been widely reported in the literature. 28,32,39 The same situation happens to metallic Ni, where the Ni 2p 3/2 peak is located at 853.3 eV and the Ni 2p 1/2 peak is determined at 870.0 eV. 28,42,43 The presence of Ni 2+ at 855.2 and 872.8 eV results from surface oxidation of the metal.…”

Section: ■ Results and Discussionmentioning

confidence: 86%

“…The N-doping level is around 4.77%, while the ratio Co/Ni is close to 1.8 (Table S2), which is consistent with element mapping results. Figure C exhibits the core-level scan spectrum of element C, where four peaks at 284.8, 285.6, 286.5, and 289.1 eV can be assigned to CC, CN, CN, and OCO, respectively. , To further understand how N atoms exist, a core-level scan was also performed on element N, in which four N species can be interpreted: pyridinic-N (398.7 eV), pyrrolic-N (400.3 eV), graphitic-N (401.4 eV), and oxidized-N (406.0 eV) (Figure D). Pyridinic-N and graphitic-N play a vital role during the ORR/OER process, prompting oxygen adsorption while decreasing the overpotential due to their superior electron-accepting capability. , Figure E and F display the core-level scan spectrum of element Co and Ni, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Bimetallic CoNi Alloy Nanoparticles Embedded in Pomegranate-like Nitrogen-Doped Carbon Spheres for Electrocatalytic Oxygen Reduction and Evolution

Chen

Han

et al. 2020

ACS Appl. Nano Mater.

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Electrocatalysts for oxygen reactions play a vital role in the applications of energy conversion devices, such as in fuel cells, water splitting, and metal−air batteries. Developing novel nonprecious bifunctional electrocatalysts is particularly essential for improvedperformance metal−air batteries by overcoming sluggish oxygen reactions. Herein, we demonstrate a composite electrocatalyst with bimetallic CoNi alloy nanocrystals embedded within nitrogen-doped highly graphitic carbon spheres (N-CoNi/PCS). Owing to the efficient design strategy, such a composite electrocatalyst exhibits a unique pomegranate-like morphology and microstructure. When applied to an alkaline electrolyte system, the porous electrocatalyst delivers a low half-wave potential of 0.80 V toward ORR and overpotential of 540 mV toward OER with excellent durability. The high performance is systematically studied and ascribed to the unique nanoarchitecture which enables fast ion transportation and electron transfer, easy access to abundant active sites, and robustness. This work forwards the field of fabricating a highly active, affordable, and stable bifunctional electrocatalyst for energy conversion.

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“…In the past decades, carbon nanomaterials have attracted great attentions from the scientific community due to their unique electronic, mechanical and structure characteristics . Among them, carbon nanotubes (CNTs) have been widely used in electronic devices, energy storage, drug delivery systems and environmental engineering because of their outstanding physicochemical properties . Particularly, surface modification of CNTs or hybridization with other inorganic substances has been developing very quickly to explore new functionalities in terms of electronic, optical and reuse properties .…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of Magnetic Nanoparticles Encapsulated by Carbon Nanotube for Selective Aromatic Compound Adsorption

Zhu

Guan

et al. 2019

ChemistrySelect

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Based on the epoxidation modification of the carbon nanotubes surface, we develop a facile one‐pot synthesis of core‐shell magnetic carbon nanotubes where Fe3O4 nanoparticles are encapsulated inside the carbon nanotubes (Fe3O4@CNTs). Compared with traditional magnetic carbon nanotubes which prepared by surface deposition, the well‐designed core‐shell magnetic carbon nanotubes show higher selective adsorption for aromatic organic compounds. For those aromatic compounds containing hydrophilic groups on benzene rings such as phenols, the equilibrium adsorption capacity of the compound on the surface of Fe3O4@CNTs is almost zero. Conversely, the Fe3O4@CNTs exhibit good adsorption capacity for those aromatic compounds with electron‐withdrawing group on benzene ring such as nitro group, and the equilibrium adsorption capacity can reach 2.07 mg/g in aqueous solution. In addition, the corresponding selective adsorption mechanism is put forward through the kinetic studies. This study provides a new strategy for the water environmental treatment and the reuse of aromatic pollutants.

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Co2Ni alloy/N-doped CNTs composite as efficient hydrogen evolution reaction catalyst in alkaline medium

Cited by 36 publications

References 41 publications

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

Bimetallic CoNi Alloy Nanoparticles Embedded in Pomegranate-like Nitrogen-Doped Carbon Spheres for Electrocatalytic Oxygen Reduction and Evolution

One‐Pot Synthesis of Magnetic Nanoparticles Encapsulated by Carbon Nanotube for Selective Aromatic Compound Adsorption

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