Intercalated complexes of 1T′-MoS<sub>2</sub> nanosheets with alkylated phenylenediamines as excellent catalysts for electrochemical hydrogen evolution

Kwak, In Hye; Kwon, Ik Seon; Abbas, Hafiz Ghulam; Seo, Jaemin; Jung, Gabin; Lee, Yeron; Kim, Doyeon; Ahn, Jae‐Pyoung; Park, Jeunghee; Kang, Hong Seok

doi:10.1039/c8ta11085a

Cited by 42 publications

(23 citation statements)

References 47 publications

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“…All samples exhibited the expanded distance between adjacent layers ( d 002 = 9.5 Å). This distance is larger than the value (6.14 Å) of 1T′ MoS 2 ( c = 12.28 Å) calculated in our previous work, [ 21 ] and this could be explained by the intercalation of DMF solvent. The intercalation of DMF induced the formation of 1T′ phase since the DMF cation can form the charge transfer complex, as shown in our previous work on the intercalation of amine molecules.…”

Section: Resultscontrasting

confidence: 82%

“…The intercalation of DMF induced the formation of 1T′ phase since the DMF cation can form the charge transfer complex, as shown in our previous work on the intercalation of amine molecules. [ 21 ] Ru–MoS 2 and CoRu–MoS 2 showed the hexagonal phase Ru peaks. There were no peaks from the Co.…”

Section: Resultsmentioning

confidence: 99%

“…The zigzag pattern (pink line) was marked using the atomic model we calculated. [ 21 ] The shortest Mo–Mo distance ( d Mo–Mo = 2.8 Å) corresponds to the 1T′ phase (calculated value = 2.75 Å). The intensity profile recorded along the arrow marked by (i) in the simulated STEM image, corresponding to the longest Mo–Mo distance (5.7 Å), shows strong Mo peaks and no S peak.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore the less blueshifted peak is assigned to the metallic 1T′ phase according to our previous work (see the peak fitting in Figure S3 in the Supporting Information). [ 21 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 2–4 ] Many studies reported that the metastable metallic tetragonal (1T) or 1T′ (distorted 1T) phase of MoS 2 has better electrocatalytic properties than the stable semiconducting hexagonal (2H) phase. [ 5–21 ] The 2H phase has inactive basal planes, so the activity arises mainly from the metallic edges. On the other hand, the 1T or 1T′ phase MoS 2 has excellent electrical conductivity as well as active basal planes toward HER.…”

Section: Introductionmentioning

confidence: 99%

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Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS₂ Nanosheets for Overall Water Splitting

Kwon

Debela

Kwak

et al. 2020

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2D MoS2 nanostructures have recently attracted considerable attention because of their outstanding electrocatalytic properties. The synthesis of unique Co–Ru–MoS2 hybrid nanosheets with excellent catalytic activity toward overall water splitting in alkaline solution is reported. 1T′ phase MoS2 nanosheets are doped homogeneously with Co atoms and decorated with Ru nanoparticles. The catalytic performance of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is characterized by low overpotentials of 52 and 308 mV at 10 mA cm−2 and Tafel slopes of 55 and 50 mV decade−1 in 1.0 m KOH, respectively. Analysis of X‐ray photoelectron and absorption spectra of the catalysts show that the MoS2 well retained its metallic 1T′ phase, which guarantees good electrical conductivity during the reaction. The Gibbs free energy calculation for the reaction pathway in alkaline electrolyte confirms that the Ru nanoparticles on the Co‐doped MoS2 greatly enhance the HER activity. Water adsorption and dissociation take place favorably on the Ru, and the doped Co further catalyzes HER by making the reaction intermediates more favorable. The high OER performance is attributed to the catalytically active RuO2 nanoparticles that are produced via oxidation of Ru nanoparticles.

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Section: Resultscontrasting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Therefore the less blueshifted peak is assigned to the metallic 1T′ phase according to our previous work (see the peak fitting in Figure S3 in the Supporting Information). [ 21 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS₂ Nanosheets for Overall Water Splitting

Kwon

Debela

Kwak

et al. 2020

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Edge‐Enriched Ultrathin MoS₂ Embedded Yolk‐Shell TiO₂ with Boosted Charge Transfer for Superior Photocatalytic H₂ Evolution

Wang

Zhu

Cao

et al. 2019

Adv Funct Materials

134

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Exploring TiO 2 -photocatalysts for sunlight conversion has high demand in artificial photosynthesis. In this work, edge-enriched ultrathin molybdenum disulfide (MoS 2 ) flakes are uniformly embedded into the bulk of yolk-shell TiO 2 as a cocatalyst to accelerate photogeneratedelectron transfer from the bulk to the surface of TiO 2 . The as-formed MoS 2 /TiO 2 (0.14 wt%) hybrids exhibit a high hydrogen evolution rate (HER) of 2443 μmol g −1 h −1 , about 1000% and 470% of that of pristine TiO 2 (247 μmol g −1 h −1 ) and bulk MoS 2 decorated TiO 2 (513 μmol g −1 h −1 ). Such a greatly enhanced HER is attributed to the exposed catalytic edges of the ultrathin MoS 2 flakes with a robust chemical linkage (TiS bond), providing rapid charge transfer channels between TiO 2 and MoS 2 . The catalytic stability is promoted by the antiaggregation of the highly dispersed MoS 2 flakes in the bulk of yolk-shell TiO 2 . The exponential fitted decay kinetics of time-resolved photoluminescence (ns-PL) spectra illustrates that embedding ultrathin MoS 2 flakes in TiO 2 effectively decreases the average lifetime of PL in the MoS 2 /TiO 2 hybrids (τ ave = 4.55 ns), faster than that of pristine TiO 2 (≈7.17 ns) and the bulk MoS 2 /TiO 2 (≈6.13 ns), allowing a superior charge separation and charge trapping process for reducing water.

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Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Zhao

Jin

et al. 2020

Adv Funct Materials

212

129

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Efficient electrocatalysts are key requirements for the development of ecofriendly electrochemical energy‐related technologies and devices. It is widely recognized that the introduction of vacancies is becoming an important and valid strategy to promote the electrocatalytic performances of the designed nanomaterials. In this review, the significance of vacancies (i.e., cationic vacancies, anionic vacancies, and mixed vacancies) on the improvement of electrocatalytic performances via three main functionalities, including tuning the electronic structure, regulating the active sites, and improving electrical conductivity, is systematically discussed. Recent achievements in vacancy engineering on various hotspot electrocatalytic processes are comprehensively summarized, with focus on the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), nitrogen reduction reaction (NRR), CO2 reduction reaction (CO2RR), and their further applications in overall water‐splitting and zinc–air battery devices. The recent development of vacancy engineering for other energy‐related applications is also summarized. Finally, the challenges and prospects of vacancy engineering to regulate the electrocatalytic performances of different electrochemical reactions are discussed.

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Intercalated complexes of 1T′-MoS₂ nanosheets with alkylated phenylenediamines as excellent catalysts for electrochemical hydrogen evolution

Abstract: Two-dimensional 1T′ phase MoS2 that was intercalated with a series of alkylated p-phenylenediamines exhibits excellent catalytic activity toward hydrogen evolution reaction, supported by first-principles calculations.

Cited by 42 publications

References 47 publications

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS₂ Nanosheets for Overall Water Splitting

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS₂ Nanosheets for Overall Water Splitting

Edge‐Enriched Ultrathin MoS₂ Embedded Yolk‐Shell TiO₂ with Boosted Charge Transfer for Superior Photocatalytic H₂ Evolution

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

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Intercalated complexes of 1T′-MoS2 nanosheets with alkylated phenylenediamines as excellent catalysts for electrochemical hydrogen evolution

Abstract: Two-dimensional 1T′ phase MoS2 that was intercalated with a series of alkylated p-phenylenediamines exhibits excellent catalytic activity toward hydrogen evolution reaction, supported by first-principles calculations.

Cited by 42 publications

References 47 publications

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS2 Nanosheets for Overall Water Splitting

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS2 Nanosheets for Overall Water Splitting

Edge‐Enriched Ultrathin MoS2 Embedded Yolk‐Shell TiO2 with Boosted Charge Transfer for Superior Photocatalytic H2 Evolution

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

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Resources

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Intercalated complexes of 1T′-MoS₂ nanosheets with alkylated phenylenediamines as excellent catalysts for electrochemical hydrogen evolution

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS₂ Nanosheets for Overall Water Splitting

Ruthenium Nanoparticles on Cobalt‐Doped 1T′ Phase MoS₂ Nanosheets for Overall Water Splitting

Edge‐Enriched Ultrathin MoS₂ Embedded Yolk‐Shell TiO₂ with Boosted Charge Transfer for Superior Photocatalytic H₂ Evolution