Kirkendall effect induced bifunctional hybrid electrocatalyst (Co9S8@MoS2/N-doped hollow carbon) for high performance overall water splitting

Kim, Minjun; Seok, Hyunho; Selvam, N. Clament Sagaya; Cho, Jinil; Choi, Gwan Hyun; Nam, Myeong Gyun; Kang, Sung‐Mo; Kim, Taesung; Yoo, Pil J.

doi:10.1016/j.jpowsour.2021.229688

Cited by 71 publications

(27 citation statements)

References 59 publications

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“…For the electrospinning, a solution containing 15 wt % of ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 , ATTM, Alfa Aesar, Ward Hill, MA, USA) and 15 wt % of poly(styreneacrylonitrile, SAN, Mw = 1,300,000) dissolved in 10 mL of N,N-dimethylformamide (DMF, Sigma-Aldrich, Burlington, MA, USA), was prepared on the hot plate by stirring the solution at 70 • C for 12 h. The solution was electrospun by applying a high voltage of 15 kV using an electrospinning machine (NanoNC, Seoul, South Korea). After the electrospinning, the electrospun NFs were thermally treated under H 2 /Ar (4/96, v/v) surroundings at 450 • C for 2 h and under a pure Ar (99.999%) atmosphere at 800 • C for 6 h, respectively [17,22]. These processes were performed to make the MoS 2 @CNFs.…”

Section: Methodsmentioning

confidence: 99%

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

Cho

Kim

et al. 2021

Nanomaterials

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Sodium-ion batteries (SIBs) have been increasingly studied due to sodium (Na) being an inexpensive ionic resource (Na) and their battery chemistry being similar to that of current lithium-ion batteries (LIBs). However, SIBs have faced substantial challenges in developing high-performance anode materials that can reversibly store Na+ in the host structure. To address these challenges, molybdenum sulfide (MoS2)-based active materials have been considered as promising anodes, owing to the two-dimensional layered structure of MoS2 for stably (de)inserting Na+. Nevertheless, intrinsic issues of MoS2—such as low electronic conductivity and the loss of active S elements after a conversion reaction—have limited the viability of MoS2 in practical SIBs. Here, we report MoS2 embedded in carbon nanofibers encapsulated with a reduced graphene oxide (MoS2@CNFs@rGO) composite for SIB anodes. The MoS2@CNFs@rGO delivered a high capacity of 345.8 mAh g−1 at a current density of 100 mA g−1 for 90 cycles. The CNFs and rGO were synergistically taken into account for providing rapid pathways for electrons and preventing the dissolution of S sources during repetitive conversion reactions. This work offers a new point of view to realize MoS2-based anode materials in practical SIBs.

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Section: Methodsmentioning

confidence: 99%

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

Cho

Kim

et al. 2021

Nanomaterials

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“…As revealed in Fig. 4a, all the C 1s XPS spectra have two peaks, one peak at 284.9 eV represents the typical C-C/CQC bonds, and another peak located at 286.7 eV corresponds to C-N/C-P bonds, 6,7 which reveals the intimate interaction of N and P to the carbon skeleton. The high-resolution N 1s spectra (Fig.…”

Section: Morphological and Structural Characterizationsmentioning

confidence: 97%

Synergistically coupling P-doped Mo₂C@N, P dual-doped carbon-nanoribbons as an efficient electrocatalyst for the hydrogen evolution reaction

Wang

Huang

et al. 2022

New J. Chem.

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“…[4][5][6][7] However, owing to various inherent thermodynamic and kinetic issues, such as the large overpotential needed, water splitting requires an efficient electrocatalyst to improve its energetic efficiency. [8][9][10] So far, noble platinum (Pt) catalysts and noble metal oxides (i.e., IrO 2 or RuO 2 ) have been shown to be highly active electrocatalysts for HER and OER, respectively. Regrettably, the high cost, poor stability, limited reserves, and monofunctional action of these precious catalysts hinder their commercial application for water electrolysis.…”

Section: Hollow Carbon Nanoballs On Graphene As Metal-free Catalyst For Overall Electrochemical Water Splittingmentioning

confidence: 99%

Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

Begum

Ahmed

Jung

2021

Adv Materials Inter

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A great deal of research effort has been dedicated for designing an efficient bifunctional metal‐free carbon catalyst for electrochemical water splitting, however, it remains challenging to introduce multiactive sites into a single catalyst. Herein, a series of bifunctional catalysts is designed that exploit intramolecular reorientation of nitrogen atom within the hollow nanoball from polyacrylonitrile on graphene through thermal treatment to achieve covalent doping. The as synthesized hollow carbon nanoballs on graphene (HCNB@G) catalysts have huge defective edges and microporous channels and contain a high density of electroactive graphitic‐N and pyridinic‐N as dual‐active sites. As a result, the optimized HCNB@G‐700 enhances electrocatalytic activities for both oxygen evolution and hydrogen evolution reactions (OER and HER) in 1.0 m KOH by generating 217 and 108 mV overpotential to gain a current density of 10 mA cm−2, respectively. This remarkable electrocatalytic activity mainly originates from the appropriate combination of suitable nitrogen active sites and edge defects with microchannels that not only facilitate the penetration of electrolyte but also improve the stability of the HCNB@G. In addition, the superior conductivity and high surface area of HCNB@G boost electrocatalytic activity by supporting efficient charge transport and enabling rapid mass diffusion with gas release, respectively.

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Kirkendall effect induced bifunctional hybrid electrocatalyst (Co9S8@MoS2/N-doped hollow carbon) for high performance overall water splitting

Cited by 71 publications

References 59 publications

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

Synergistically coupling P-doped Mo₂C@N, P dual-doped carbon-nanoribbons as an efficient electrocatalyst for the hydrogen evolution reaction

Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

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Kirkendall effect induced bifunctional hybrid electrocatalyst (Co9S8@MoS2/N-doped hollow carbon) for high performance overall water splitting

Cited by 71 publications

References 59 publications

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

Synergistically coupling P-doped Mo2C@N, P dual-doped carbon-nanoribbons as an efficient electrocatalyst for the hydrogen evolution reaction

Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

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Synergistically coupling P-doped Mo₂C@N, P dual-doped carbon-nanoribbons as an efficient electrocatalyst for the hydrogen evolution reaction