Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes

Cui, Tingting; Dong, Jinhu; Pan, Xiulian; Yu, Tie; Fu, Qiang; Bao, Xinhe

doi:10.1016/j.jechem.2018.03.006

Cited by 57 publications

(28 citation statements)

References 51 publications

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“…For SWNTs and the FeK/SWNTs catalyst, the isotherms show a distinct increase at relative pressure ( P / P 0 ) of 0–0.1 and a hysteresis loop in a high P / P 0 range of 0.85 to 1 (Figure a). The former is ascribed to the filling of the microchannels in SWNTs, while the latter is originated from the stacking pores of SWNTs . As seen in Figure b, SWNTs and the FeK/SWNTs catalyst display a bimodal pore size distribution peaked at 0.47 and 0.72 nm with the former being predominant.…”

Section: Resultsmentioning

confidence: 93%

“…The former is ascribed to the filling of the microchannels in SWNTs, while the latter is originated from the stacking pores of SWNTs. 26 As seen in Figure 1b, SWNTs and the FeK/ SWNTs catalyst display a bimodal pore size distribution peaked at 0.47 and 0.72 nm with the former being predominant. These micropore sizes are characteristic of zigzagged SWNTs with C 36 structure and (n,m) value of (6,0) with the theoretical tube diameter of 0.47 nm (d = 0.246(n 2 + m 2 + nm) 1/2 /π nm) 27 and SWNTs with C 60 structure with the theoretical diameter of ∼0.7 nm, 28 respectively.…”

Section: T H I S C O N T E N T I S O N L Y L I C E N S E D F O R C O ...mentioning

confidence: 99%

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Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO₂ Hydrogenation to Heavy Olefins

Wang

Lin

et al. 2020

ACS Catal.

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The iron–potassium catalysts supported on single- and multiwalled carbon nanotubes, FeK/SWNTs and FeK/MWNTs, were fabricated, characterized, and evaluated in CO2 hydrogenation. The FeK/SWNTs catalyst outperforms the FeK/MWNTs catalyst in selectivity during CO2 hydrogenation to olefins with the selectivities being 62.3% and 52.4%, respectively. Of particular interest is that the FeK/SWNTs catalyst is more selective toward heavy olefins (C5+ = selectivity, 39.8%), whereas the FeK/MWNTs catalyst is more selective to light olefins (C2–C4 = selectivity, 30.7%). The FeK/SWNTs catalyst also affords much lower selectivities to undesired CO and CH4 in addition to higher productivity of hydrocarbons, thus resulting in an unprecedentedly high productivity of heavy olefins of 27.6 μmolCO2 gFe –1 s–1. The more electron-enriched exterior of SWNTs with large curvature, higher abundance of Hägg carbide, and stronger interaction with light olefins may rationalize the superior catalytic behavior of the FeK/SWNTs catalyst in CO2 hydrogenation to heavy olefins. The FeK/SWNTs catalyst also exhibited a minor change in catalytic performance in a 120 h stability test, highlighting SWNTs as a promising catalyst support for producing value-added chemicals from greenhouse gas CO2.

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Section: Resultsmentioning

confidence: 93%

Section: T H I S C O N T E N T I S O N L Y L I C E N S E D F O R C O ...mentioning

confidence: 99%

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO₂ Hydrogenation to Heavy Olefins

Wang

Lin

et al. 2020

ACS Catal.

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“…[7][8] Currently, iridium (Ir) and ruthenium (Ru) are the most efficient electrocatalysts for OER, platinum (Pt) for the ORR, [9][10][11][12][13][14][15] however, their high cost and scarce resources have hindered their large-scale application. [16][17][18][19][20] Therefore, there is an urgent need to develop low-cost, efficient, and durable for ORR and OER. In response, various types of materials, especially transition metal-based catalysts as alternatives, have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Encapsulated NiCo₂S₄‐based straight bamboo‐shaped N‐CNT as efficient and stable oxygen electrocatalysts

Gao

Zhao

2021

Electrochemical Science Adv

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Developing highly effective and stable non-precious bifunctional oxygen electrocatalysts is crucial and challenging. Herein, we report nano-mediated straight bamboo-shaped nitrogen-doped carbon nanotubes modified with encapsulated NiCo 2 S 4 -based nanoparticles (E-NiCo 2 S 4 /SBS-NCNTs) by electrodeposition and procedural calcination strategy, in which nitrogen-doped carbon nanotubes with straight bamboo shape (SBS-NCNTs) show more average diameter and encapsulated NiCo 2 S 4 -based nanoparticles (E-NiCo 2 S 4 ) are coated by carbon, and what makes us even more excited is that they are evenly dispersed on SBS-NCNTs surface, not just at the tip or inside. When applied for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), E-NiCo 2 S 4 /SBS-NCNTs show excellent catalytic activity, and onset potential (E onset ) in OER and ORR is only 1.52 V and 0.95 V (vs. RHE) in 0.1 M KOH, respectively. More importantly, the hybrids exhibit good methanol tolerance, with almost unchanged for ORR performance after adding 0.5 M methanol, and it has highly stability, the current density dropped by 22% after 7 h of reaction. The interaction of NiCo 2 S 4 with the external carbon layer can greatly enhance the electrocatalytic activity toward the OER and it has a complete 4ereaction process toward the ORR. The excellent electrocatalytic activity is mainly due to synergistic enhancement effect, in which SBS-NCNTs with highly catalytic activity provide good conductivity, expose more active sites and promotes fast mass transfer; Carbon-coated NiCo 2 S 4 -based nanoparticles can improve the local work function of SBS-NCNT through synergistic electronic interaction, promoting O 2 adsorption, ensure rapid electron transport, and enable SBS-NCNT to improve its electrocatalytic activity. Because of the weakness of Ostwald effect and synergistic enhancement, the stability and catalytic activity of NiCo 2 S 4 -based nanoparticles can be greatly improved. All these advantages can synergistically improve the electrocatalytic efficiency and make it become one of the most promising bifunctional oxygen electrocatalysts.

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“…By keeping the aforementioned issues in view, enormous efforts are devoted towards designing alternative catalysts with earth abundance, cost-effective and superior activity over the past several decades including transition metal oxides [7,8], sulfides [9,10], carbides [11,12], nitrides [13,14], borides [15,16], phosphides [17,18] and metal-free catalyst [19,20], which can overcome the economical limitations and stability issues. Additionally, some noble metals (e.g., Pd, Ru) are also used to trigger the HER kinetics.…”

Section: Introductionmentioning

confidence: 99%

Atomic Pt-Clusters Decoration Triggers a High-Rate Performance on Ni@Pd Bimetallic Nanocatalyst for Hydrogen Evolution Reaction in Both Alkaline and Acidic Medium

et al. 2020

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The development of inexpensive and highly robust nanocatalysts (NCs) to boost electrochemical hydrogen evolution reaction (HER) strengthens the implementation of several emerging sustainable-energy technologies. Herein, we proposed a novel nano-architecture consisting of a hierarchical structured Ni@Pd nanocatalyst with Pt-clusters decoration on the surface (denoted by Ni@Pd-Pt) for HER application in acidic (0.5 M H2SO4) and alkaline (0.1 M KOH) mediums. The Ni@Pd-Pt NC is fabricated on a carbon black support via a “self-aligned” heterogeneous nucleation-crystal growth mechanism with 2 wt.% Pt-content. As-prepared Ni@Pd-Pt NC outperforms the standard Pt/C (30 wt.% Pt) catalyst in HER and delivers high-rate catalytic performance with an ultra-low overpotential (11.5 mV) at the cathodic current density of 10 mA∙cm−2 in alkaline medium, which is 161.5 mV and 14.5 mV less compared to Ni@Pd (173 mV) and standard Pt/C (26 mV) catalysts, respectively. Moreover, Ni@Pd-Pt NC achieves an exactly similar Tafel slope (42 mV∙dec−1) to standard Pt/C, which is 114 mV∙dec−1 lesser when compared to Ni@Pd NC. Besides, Ni@Pd-Pt NC exhibits an overpotential value of 37 mV at the current density of 10 mA cm−2 in acidic medium, which is competitive to standard Pt/C catalyst. By utilizing physical characterizations and electrochemical analysis, we demonstrated that such an aggressive HER activity is dominated by the increased selectivity during HER due to the reduced competition between intermediate products on the non-homogeneous NC surface. This phenomenon can be rationalized by electron localization owing to the electronegative difference (χPt > χPd > χNi) and strong lattice mismatch at the Ni@Pd heterogeneous binary interfaces. We believe that the obtained results will significantly provide a facile design strategy to develop next-generation heterogenous NCs for HER and related green-energy applications

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Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes

Cited by 57 publications

References 51 publications

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO₂ Hydrogenation to Heavy Olefins

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO₂ Hydrogenation to Heavy Olefins

Encapsulated NiCo₂S₄‐based straight bamboo‐shaped N‐CNT as efficient and stable oxygen electrocatalysts

Atomic Pt-Clusters Decoration Triggers a High-Rate Performance on Ni@Pd Bimetallic Nanocatalyst for Hydrogen Evolution Reaction in Both Alkaline and Acidic Medium

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Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes

Cited by 57 publications

References 51 publications

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO2 Hydrogenation to Heavy Olefins

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO2 Hydrogenation to Heavy Olefins

Encapsulated NiCo2S4‐based straight bamboo‐shaped N‐CNT as efficient and stable oxygen electrocatalysts

Atomic Pt-Clusters Decoration Triggers a High-Rate Performance on Ni@Pd Bimetallic Nanocatalyst for Hydrogen Evolution Reaction in Both Alkaline and Acidic Medium

Contact Info

Product

Resources

About

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO₂ Hydrogenation to Heavy Olefins

Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO₂ Hydrogenation to Heavy Olefins

Encapsulated NiCo₂S₄‐based straight bamboo‐shaped N‐CNT as efficient and stable oxygen electrocatalysts