Revisiting the Role of Active Sites for Hydrogen Evolution Reaction through Precise Defect Adjusting

Zhuang, Peiyuan; Sun, Yangye; Dong, Pei; Smith, W. M.; Sun, Zhengzong; Ge, Yuancai; Pei, Yu; Cao, Ziyi; Ajayan, Pulickel M.; Shen, Jianfeng; Ye, Mingxin

doi:10.1002/adfm.201901290

Cited by 72 publications

(51 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the discovery of topological superconductivity and large magnetoresistance in this compound it has been the subject of comprehensive fundamental research [11][12][13][14] . In addition, 1T′-MoTe 2 has been highlighted as an emerging energy material with applications ranging from photovoltaic cells to hydrogen evolution catalysis [15][16][17] . Furthermore, few-layered 1T′-MoTe 2 may become a promising sensing platform enabled through its ability to suppress fluorescence signals which often prevents reliable detection of Raman scattering from negligible traces of molecules 18 .…”

mentioning

confidence: 99%

Selective phase growth and precise-layer control in MoTe2

et al. 2020

View full text Add to dashboard Cite

Minor structural changes in transition metal dichalcogenides can have dramatic effects on their electronic properties. This makes the quest for key parameters that enable a selective choice between the competing metallic and semiconducting phases in the 2D MoTe 2 system compelling. Herein, we report the optimal conditions at which the choice of the initial seed layer dictates the type of crystal structure of atomically-thin MoTe 2 films grown by chemical vapour deposition (CVD). When Mo metal is used as a seed layer, semiconducting 2H-MoTe 2 is the only product. Conversely, MoO 3 leads to the preferential growth of metallic 1T′-MoTe 2. The control over phase growth allows for simultaneous deposition of both 2H-MoTe 2 and 1T′-MoTe 2 phases on a single substrate during one CVD reaction. Furthermore, Rhodamine 6G dye can be detected using few-layered 1T′-MoTe 2 films down to 5 nM concentration, demonstrating surface enhanced Raman spectroscopy (SERS) with sensitivity several orders of magnitude higher than for bulk 1T′-MoTe 2 .

show abstract

mentioning

confidence: 99%

Selective phase growth and precise-layer control in MoTe2

et al. 2020

View full text Add to dashboard Cite

show abstract

“…simply obtained few‐layered 1T′ phase MoTe 2 ultrathin film on SiO 2 /Si substrate using tellurium powder and electron‐beam evaporated molybdenum film as raw materials. [ 76 ] The atomic force microscopy (AFM) image substantiates a 7 layer‐structure of as‐prepared MoTe 2 film. Researchers subsequently etched those as‐prepared MoTe 2 films by using focused ion beam (FIB) technology to generate active sites on the specific area in order to contribute to the conspicuous enhancement of HER catalytic ability.…”

Section: Preparationmentioning

confidence: 92%

Metallic Transition Metal Dichalcogenides of Group VIB: Preparation, Stabilization, and Energy Applications

Wang

et al. 2021

Small

View full text Add to dashboard Cite

Layered transition metal dichalcogenides (TMDs) of group VIB have been widely used in the realms of energy storage and conversions. Along with the existence of semiconducting states, their metallic phases have recently attracted numerous attentions owing to their fascinating physical and chemical properties. Many efforts have been devoted to obtain metallic TMDs with high purity and yield. Nevertheless, such metallic phase is thermodynamically metastable and tends to convert into semiconducting phase, which necessitates the exploration over effective strategies to ensure the stability. In this review, typical fabrication routes are introduced and those critical factors during preparation are elaborately discussed. Moreover, the stabilized strategies are summarized with concrete examples highlighting the key mechanisms toward efficient stabilization. Finally, emerging energy applications are overviewed. This review presents comprehensive research status of metallic group VIB TMDs, aiming to facilitate further scientific investigations and promote future practical applications in the fields of energy storage and conversion.

show abstract

“…Furthermore, introducing crystal defects is also a common route to increase the number of active sites and intrinsic activity. [ 249–251 ] Therefore, tailoring the defects of wide‐bandgap electrocatalysts may be a compelling scheme to implement high‐performance photothermy‐assisted electrocatalytic HER/OER in the future.…”

Section: Light‐assisted Electrocatalytic Her/oermentioning

confidence: 99%

Promoting Electrocatalytic Hydrogen Evolution Reaction and Oxygen Evolution Reaction by Fields: Effects of Electric Field, Magnetic Field, Strain, and Light

et al. 2020

View full text Add to dashboard Cite

promising alternative to fossil fuels. Water electrolysis by renewable resourcederived electricity represents a facile and green route to produce H 2. [1-13] Generally, the key to implement high-performance water splitting is to develop economically viable, efficient, and robust electrocatalysts to lower the activation potential barriers. Thus far, researchers have devoted extensive enthusiasm to the investigation of electrocatalysts. Currently, most efforts have been taken on the search for new materials, [14-16] regulation of morphology, [17] crystallinity, [18] facet, [19] component, [20-24] defect, [25,26] matter phase, [27,28] or the compositing of various materials with synergy. [29-36] However, the performances of emerging nonnoble electrocatalysts still lag behind those of noble ones. To address this issue, researchers have turned their attention beyond the electrocatalysts themselves. Field-assisted electrocatalysis is the electrocatalytic reaction proceeded in the presence of a field. It represents a promising methodology since it exerts an additional degree of freedom to engineer an electrochemical process. Inspiringly, indisputable improvements in electrocatalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) have been implemented with the assist of various fields, including electric field, magnetic field, strain, and light. For example, the electrocatalytic HER of a MoS 2 nanosheet is markedly boosted by simply exploiting a back gate voltage of 5 V. [37] Its overpotential at −100 mA cm −2 is decreased from 240 to 38 mV. In addition, enhancement of alkaline water electrolysis is achieved by applying a moderate magnetic field (≤450 mT) to an electrocatalytic anode consists of highly magnetic electrocatalysts. [38] Its current density increments are beyond 100%. Furthermore, the HER activity of β-PdH x increases monotonically as the applied strain increases from 0% to 4.5%. [39] Lastly, an approximately threefold increase in current density of Au-MoS 2 for electrocatalytic HER is realized upon the illumination of IR light. [40] These results undoubtedly elucidate that applying a field during electrocataly sis opens up great opportunities toward further improving electrocatalytic activity. Moreover, this approach provides merits of facile, dynamical, continuous, reversible, and universal control. Despite fascinating achievements, these investigations are relatively scattered. The underneath mechanisms and principles Hydrogen fuel is considered as one of the most clean renewable resources, warranting it a primary alternative to fossil fuels for future energy supplies. Electrocatalytic water splitting is an eco-friendly technique for high-purity hydrogen production. However, the sluggish dynamics of its two halfreactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), are tough challenges impeding the practical application of this technology. In these years, external field-assisted HER and OER have attracted extensive research interests. Herein, the effects o...

show abstract

Revisiting the Role of Active Sites for Hydrogen Evolution Reaction through Precise Defect Adjusting

Cited by 72 publications

References 37 publications

Selective phase growth and precise-layer control in MoTe2

Selective phase growth and precise-layer control in MoTe2

Metallic Transition Metal Dichalcogenides of Group VIB: Preparation, Stabilization, and Energy Applications

Promoting Electrocatalytic Hydrogen Evolution Reaction and Oxygen Evolution Reaction by Fields: Effects of Electric Field, Magnetic Field, Strain, and Light

Contact Info

Product

Resources

About