In-situ coalesced vacancies on MoSe2 mimicking noble metal: Unprecedented Tafel reaction in hydrogen evolution

Lee, Jung-Hyun; Kim, Changmin; Choi, Keunsu; Seo, Jihyung; Choi, Yunseong; Choi, Wooseon; Kim, Young‐Min; Jeong, Hu Young; Lee, Jun Hee; Kim, Guntae; Park, Hyesung

doi:10.1016/j.nanoen.2019.06.042

Cited by 44 publications

(23 citation statements)

References 39 publications

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“…. . ARTICLES commercial Pt/C shows an overpotential of 29 mV, consistent with the previously reported literature [44,45]. Tafel slope is a crucial parameter to assess the rate-limiting step and kinetics in HER.…”

Section: Science China Materialssupporting

confidence: 89%

“…Tafel slope is a crucial parameter to assess the rate-limiting step and kinetics in HER. Volmer, Heyrovsky, and Tafel reactions are three types of rate-limiting steps of HER, where the theoretical values of Tafel slopes are 120, 40 and 30 mV dec −1 , respectively [44,45]. As shown in Fig.…”

Section: Science China Materialsmentioning

confidence: 93%

“…4b, the fitting linear portion of Tafel plots was determined to be 10 mA cm −2 . Both Mo 2 C@N-CNFs and [45].…”

Section: Science China Materialsmentioning

confidence: 99%

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Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

et al. 2020

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Noble metal-free electrocatalysts with high activity are highly desirable for the large-scale application of hydrogen evolution reaction (HER). Mo 2 C-based nanomaterials have been proved as a promising alternative to noble metal-based electrocatalysts owing to the Pt-resembled d-band density and optimal intermediates-adsorption properties. However, the aggregation and excessive growth of crystals often occur during their high-temperature synthesis procedure, leading to low catalytic utilization. In this study, the ultrafine Mo 2 C/Mo 2 N heterostructure with large surface and interface confined in the N-doped carbon nanofibers (N-CNFs) was obtained by a melamine-assisted method. The synergistic effect of Mo 2 C/Mo 2 N heterostructure and plenty active sites exposed on the surface of ultrafine nanocrystals improves the electrocatalytic activity. Meanwhile, the N-CNFs ensure fast charge transfer and high structural stability during reactions. Moreover, the in-situ synthesis method strengthens the interfacial coupling interactions between Mo 2 C/Mo 2 N heterostructure and N-CNFs, further enhancing the electronic conductivity and electrocatalytic activity. Owing to these advantages, Mo 2 C/Mo 2 N@N-CNFs exhibit excellent HER performance with a low overpotential of 75 mV at a current density of 10 mV cm −2 in alkaline solution, superior to the single-phased Mo 2 C counterpart and recently reported Mo 2 C/ Mo 2 N-based catalysts. This study highlights a new effective strategy to design efficient electrocatalysts via integrating heterostructure, nanostructure and carbon modification.

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Section: Science China Materialssupporting

confidence: 89%

Section: Science China Materialsmentioning

confidence: 93%

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Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

et al. 2020

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“…Importantly, the XPS spectrum of Se 3d in PtNi‐Se v is presented with two obvious peaks located at about 59 and 52 eV compared with the Se powder XPS spectrum. The peak at 59 eV can be assigned to the defect‐related Se v and that at 52 eV is corresponding to Pt 5p 3/2 24,25 . For a sharp comparison, Se 3d XPS spectrum of PtNi‐Se displays the extraordinarily strong Se species peak and very faint Se v peak (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Boosting hydrogen production with ultralow working voltage by selenium vacancy‐enhanced ultrafine platinum–nickel nanowires

Zhang

Yang

et al. 2022

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Defect engineering provides a highly potential way to yield exceptional catalytic performance. Herein, we first report the selenium (Se) vacancies‐decorated ultrafine platinum–nickel (PtNi‐Sev) nanowires, as a bifunctional catalyst for the hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). The optimized PtNi‐Sev exhibits obvious enhancement for HER and MOR compared to PtNi nanowires. It displays merely an overpotential of 18.8 mV for alkaline HER and the outstanding MOR performance (3.51 A/mgPt). When applying in one symmetric overall water splitting electrolyzer coupling with HER and MOR, an ultralow working voltage of 0.637 V with 100% Faraday efficiency for hydrogen production was achieved at the current density of 10 mA/cm2. Further investigations reveal that the weakened hydrogen binding energy, strong OH binding as well as relative weak CO binding are responsible for the improved HER and MOR activities.

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“…Transition metal dichalcogenide (TMD) materials MX 2 (M = transition metal; X = chalcogen) with lamellar structure have received broad attentions in the fields of batteries, supercapacitors, catalysts, and sensors due to their large layer distance and high surface area [1][2][3][4][5][6]. Among them, transition metal selenides (MSe 2 ) have higher conductivity than the corresponding sulfides (MS 2 ) and oxides (MO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Tuning Interface Bridging Between MoSe2 and Three-Dimensional Carbon Framework by Incorporation of MoC Intermediate to Boost Lithium Storage Capability

et al. 2020

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In-situ coalesced vacancies on MoSe2 mimicking noble metal: Unprecedented Tafel reaction in hydrogen evolution

Cited by 44 publications

References 39 publications

Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

Boosting hydrogen production with ultralow working voltage by selenium vacancy‐enhanced ultrafine platinum–nickel nanowires

Tuning Interface Bridging Between MoSe2 and Three-Dimensional Carbon Framework by Incorporation of MoC Intermediate to Boost Lithium Storage Capability

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