MoS2 nanosheets array on carbon cloth as a 3D electrode for highly efficient electrochemical hydrogen evolution

Xiang, Zhongcheng; Zhang, Zhong; Xu, Xijin; Zhang, Qin; Yuan, Changxia

doi:10.1016/j.carbon.2015.10.071

Cited by 91 publications

(36 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover,t he X-ray photoelectron spectroscopy (XPS) analysis revealed that the Mo 3d peaks of the synthesized MoS 2 /NiS 2 ultrathin nanosheets are located at 228.4 and 231.6 eV,c orresponding to 3d 5/2 and 3d 3/2 ,w hich are in good agreement with 1T-MoS 2 (Figure 2b). [18] Notably,the ratio of 1T phase in as-synthesized 1T-MoS 2 /NiS 2 could be beyond 83 % ( Figure 3f), which is higher than most of the reported 1T-MoS 2 to date (Supporting Information, Table S1). [5,19] Apparently,t he method we propose herein is more facile, without harsh conditions.…”

mentioning

confidence: 64%

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

Chen,

Wang,

Wei

et al. 2019

Angew Chem Int Ed

122

View full text Add to dashboard Cite

The crystal phase plays an important role in controlling the properties of an anomaterial;h owever,i ti s ag reat challenge to obtain ananomaterial with high purity of the metastable phase.F or instance,the large-scale synthesis of the metallic phase MoS 2 (1T-MoS 2 )isimportant for enhancing electrocatalytic reaction, but it can only be obtained under harsh conditions.Herein, aspatially confined template method is proposed to synthesizeh igh phase-purity MoS 2 with a1 T content of 83 %. Moreover,b oth the confined space and the structure of template will affect the purity of 1T-MoS 2 ;i nt his case,t his approach was extended to other similar spatially confined templates to obtain the high-purity material. The obtained ultrathin nanosheets exhibit good electrocatalytic activity and excellent stability in the hydrogen evolution reaction.Nanomaterials have shown various promising applications in optics, [1] catalysis, [2] and electronics, [3] owing to their unique physiochemical properties,w hich strongly depend on the crystal facet, morphology,d imension, and size.I nr ecent years,t he crystal phase has been reported as an important factor to affect the physical-chemical properties.F or exam-ple,M oS 2 is at ypical polyphase material which includes trigonal (1T), hexagonal (2H), rhombohedral (3R), and 1T' forms. [4] Among them, the unique structure of 1T phase MoS 2 endows it with am etallic-like property, [5] showing higher electrical conductivity and catalytic activity. [6] Nevertheless, the thermodynamically stable phase for MoS 2 is 2H;h ence, the metastable 1T MoS 2 can only be obtained under the harsh synthetic strategies,s uch as alkali metal intercalation-exfoliation, [7] mechanical strain, [8] and electron-beam irradiation. [6a] However,the yields of the aforementioned methods are quite low,w hich severely limits the applications of metallic-phase MoS 2 . [9] It is agreat challenge to obtain high-purity 1T MoS 2 with af acile method. [8] By using the weak interactions between hetero materials, template method is considered as an efficient route to synthesize nanomaterials with metastable phases. [10] Moreover, the confined space will significantly affect the physical and chemical properties of the insert molecules. [11] In this case,t he two-dimensional confined space may induce a2 D nanosheet with metastable phases.T herefore,b yu sing layered Ni(OH) 2 as the spatially confined template,w e successfully synthesized ultrathin MoS 2 nanosheets with the 1T phase of 83 %, which is among the highest 1T ratios obtained with the wet-chemical methods (Supporting Information, Table S1). Af urther study reveals both the space in the confined template and the crystal structure of template will affect the crystal phase of nanomaterials.M oreover,t he ratio between 1T and 2H phases can be easily controlled by adjusting the structure of templates.F urthermore,t he synthesized nanosheets showed an excellent catalytic activity and stability for the hydrogen evolution reaction (HER). Our strategy provides an ew way to...

show abstract

mentioning

confidence: 64%

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

Chen,

Wang,

Wei

et al. 2019

Angew Chem Int Ed

122

View full text Add to dashboard Cite

show abstract

“…The high magnification SEM image (Figure d) shows that the rough surface is composed of hierarchical nanosheets. These nanosheets vertically align on the surface of Ni@NC particles, exposing most of their edges, which is beneficial for the catalytic activity …”

Section: Resultsmentioning

confidence: 99%

Nickel@Nitrogen‐Doped Carbon@MoS₂ Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

Shah

Shen

Xie

et al. 2019

Small

131

View full text Add to dashboard Cite

Developing cheap, abundant, and easily available electrocatalysts to drive the hydrogen evolution reaction (HER) at small overpotentials is an urgent demand of hydrogen production from water splitting. Molybdenum disulfide (MoS2) based composites have emerged as competitive electrocatalysts for HER in recent years. Herein, nickel@nitrogen‐doped carbon@MoS2 nanosheets (Ni@NC@MoS2) hybrid sub‐microspheres are presented as HER catalyst. MoS2 nanosheets with expanded interlayer spacings are vertically grown on nickel@nitrogen‐doped carbon (Ni@NC) substrate to form Ni@NC@MoS2 hierarchical sub‐microspheres by a simple hydrothermal process. The formed Ni@NC@MoS2 composites display excellent electrocatalytic activity for HER with an onset overpotential of 18 mV, a low overpotential of 82 mV at 10 mA cm−2, a small Tafel slope of 47.5 mV dec−1, and high durability in 0.5 H2SO4 solution. The outstanding HER performance of the Ni@NC@MoS2 catalyst can be ascribed to the synergistic effect of dense catalytic sites on MoS2 nanosheets with exposed edges and expanded interlayer spacings, and the rapid electron transfer from Ni@NC substrate to MoS2 nanosheets. The excellent Ni@NC@MoS2 electrocatalyst promises potential application in practical hydrogen production, and the strategy reported here can also be extended to grow MoS2 on other nitrogen‐doped carbon encapsulated metal species for various applications.

show abstract

“…The similar peak‐shift phenomenon has also been witnessed in a previous literature, in which the shifts in binding energies for substitutional doped MoS 2 was revealed . At the same time, this occurrence also suggests that annealing at 673 K may lead to phase transition from 1T‐MoS 2 to 2H‐MoS 2 , accompanied with a downshift of the binding energy of Mo as demonstrated by Xiang et al . Therefore, the changes observed for the surface chemical states of P‐doped MoS 2 as compared with those of the undoped MoS 2 have evidently demonstrated the interaction of P dopants and MoS 2 as a result of the low‐temperature phosphidation process.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus‐Doped MoS₂ Nanosheets Supported on Carbon Cloths as Efficient Hydrogen‐Generation Electrocatalysts

et al. 2018

View full text Add to dashboard Cite

Highly efficient and stable non‐noble metal electrocatalysts for hydrogen generation are desired for sustainable development of energy conversion and storage. Here, a facile low‐temperature phosphidation process is developed for phosphorus doping into molybdenum disulfide (MoS2) nanosheets directly synthesized on carbon cloths to function as an integrated electrode for efficient hydrogen evolution reaction. The optimal phosphorus‐doped (3.3 at%) MoS2 nanosheets exhibit substantially lower overpotentials of 133 and 189 mV to drive the current densities of 20 and 100 mA cm‐2, respectively, as compared with undoped MoS2, and an impressively small Tafel slope of 67.0 mV dec−1. The excellent stability in acid media also makes the phosphorus‐doped MoS2 nanosheet catalysts promising candidates for hydrogen generation in practical applications.

show abstract

MoS2 nanosheets array on carbon cloth as a 3D electrode for highly efficient electrochemical hydrogen evolution

Cited by 91 publications

References 35 publications

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

Nickel@Nitrogen‐Doped Carbon@MoS₂ Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

Phosphorus‐Doped MoS₂ Nanosheets Supported on Carbon Cloths as Efficient Hydrogen‐Generation Electrocatalysts

Contact Info

Product

Resources

About

MoS2 nanosheets array on carbon cloth as a 3D electrode for highly efficient electrochemical hydrogen evolution

Cited by 91 publications

References 35 publications

High Phase‐Purity 1T‐MoS2 Ultrathin Nanosheets by a Spatially Confined Template

High Phase‐Purity 1T‐MoS2 Ultrathin Nanosheets by a Spatially Confined Template

Nickel@Nitrogen‐Doped Carbon@MoS2 Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

Phosphorus‐Doped MoS2 Nanosheets Supported on Carbon Cloths as Efficient Hydrogen‐Generation Electrocatalysts

Contact Info

Product

Resources

About

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

Nickel@Nitrogen‐Doped Carbon@MoS₂ Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

Phosphorus‐Doped MoS₂ Nanosheets Supported on Carbon Cloths as Efficient Hydrogen‐Generation Electrocatalysts