Bamboo-Structured Nitrogen-Doped Carbon Nanotube Coencapsulating Cobalt and Molybdenum Carbide Nanoparticles: An Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Ai, Lunhong; Su, Jinfeng; Wang, Mei; Jiang, Jing

doi:10.1021/acssuschemeng.8b01120

Cited by 151 publications

(61 citation statements)

References 58 publications

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“…In their high‐resolution XPS spectra (e.g., C 1s, Ni 2p, and TM 2p or 3d), the peaks at 283.5, 283.6, and 283.4 eV are assigned to CNi in the Ni‐GF/Cr 3 C 2 (Figure S21a–c, Supporting Information), Ni‐GF/Fe 3 C (Figure S21d–f, Supporting Information), and Ni‐GF/Mo 2 C (Figure S21g,h, Supporting Information), respectively. [ 45–48 ] In their SEM images, uniform nanoflakes are noticed for three catalysts (Figure S22a–c, Supporting Information). The yellow circles (Figure S22d–f, Supporting Information) are the adsorbed TM atoms.…”

Section: Resultsmentioning

confidence: 99%

Ni‐Activated Transition Metal Carbides for Efficient Hydrogen Evolution in Acidic and Alkaline Solutions

Yang

Zhao

Xiang

et al. 2020

Advanced Energy Materials

180

132

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Transition metal carbides (TMCs) feature high catalytic activity and superior stability for the hydrogen evolution reaction (HER). However, their platinum‐like HER catalytic performance is heavily hindered, due to their strong interaction with hydrogen. Herein, Ni activation of TMCs (M = V, Fe, Cr, and Mo) is proposed through introducing adsorbed nickel atoms on the TMC surface (Ni/TMC). In both acidic and alkaline solutions, a sharp decrease of both overpotentials and Tafel slopes of the Ni/TMC catalysts for HER is achieved. At 10 mA cm−2, the overpotentials of the Ni/vanadium carbide (VC) and Ni/Fe3C catalysts are 128 and 93 mV in 1 m KOH, 111 and 112 mV in 0.5 m H2SO4, respectively. Even at 150 mA cm−2, they exhibit the overpotentials of as low as 270 and 291 mV, respectively. In the alkaline solutions, the performance of these Ni/TMC catalysts is even superior to a Pt/C catalyst. As confirmed from density functional theory calculations and X‐ray absorption fine structure analysis, such adsorbed Ni atoms effectively optimize the d‐electron structure and improve HER performance. As a versatile strategy, this work provides a universal route to activate TMCs for highly efficient HER in different media.

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Section: Resultsmentioning

confidence: 99%

Ni‐Activated Transition Metal Carbides for Efficient Hydrogen Evolution in Acidic and Alkaline Solutions

Yang

Zhao

Xiang

et al. 2020

Advanced Energy Materials

180

132

View full text Add to dashboard Cite

show abstract

“…Beyond that, a broad peak around 26 • , corresponding to graphitized carbon (002) diffraction (Hao et al, 2017;Liang et al, 2019). And compared with NC, the C(002) diffraction peak strengthened, indicating the increased graphitization of the carbon in the presence of cobalt nanoparticles (Ai et al, 2018).…”

Section: Materials Characterization Of the Co@ncmentioning

confidence: 99%

Cobalt Nanoparticles Encapsulated in Nitrogen-Doped Carbon Nanotube as Bifunctional-Catalyst for Rechargeable Zn-Air Batteries

Liu

Dong

et al. 2019

Front. Mater.

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Developing economic and efficient non-noble-metal electrocatalysts toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is vitally important to improve the performance and economic outlook of alkaline-based rechargeable Zn-air battery technologies. In this work, a nitrogen-doped carbon nanotube encapsulated with metallic cobalt nanoparticles (Co@NC) was synthesized through a facile method and subsequent pyrolysis treatment. The field emission scanning electron microscope (FESEM), high resolution transmission electron microscopy (HRTEM), Raman spectra investigations demonstrate that the presence of Co induces the formation of carbon nanotube during the pyrolysis process and increase degree of graphitization of carbon nanotubes. The electrode activity is assessed by comparing OER with ORR indicators (E). The E value of Co@NC is 0.91 V, which is lower than the commercialized Pt/C (1.1 V) and nitrogen-doped carbon (NC) (1.17 V). The Co@NC-based primary Zn-air battery display an open circuit potential of 1.4 V, a high power density of 137 mW•cm −2 , and outstanding energy density (708.3 mAh•kg −1 Zn and 868.9 Wh kg −1 Zn at 10 mA•cm −2), which batter than the commercialized Pt/C.

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“…Fig. 3(D) shows a high-resolution (HR) XPS C 1s spectrum that indicates the existence of CÀC, CÀN (sp 2 ), CÀN (sp 3 ), and CÀMo [32]. In Fig.…”

Section: Structure Of the Catalystmentioning

confidence: 99%

Constructing bifunctional Co/MoC@N-C catalyst via an in-situ encapsulation strategy for efficient oxygen electrocatalysis

Huang

Kong

Liu

et al. 2021

Journal of Energy Chemistry

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Bamboo-Structured Nitrogen-Doped Carbon Nanotube Coencapsulating Cobalt and Molybdenum Carbide Nanoparticles: An Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Cited by 151 publications

References 58 publications

Ni‐Activated Transition Metal Carbides for Efficient Hydrogen Evolution in Acidic and Alkaline Solutions

Ni‐Activated Transition Metal Carbides for Efficient Hydrogen Evolution in Acidic and Alkaline Solutions

Cobalt Nanoparticles Encapsulated in Nitrogen-Doped Carbon Nanotube as Bifunctional-Catalyst for Rechargeable Zn-Air Batteries

Constructing bifunctional Co/MoC@N-C catalyst via an in-situ encapsulation strategy for efficient oxygen electrocatalysis

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