Mixed-dimensional heterostructures of hydrophobic/hydrophilic graphene foam for tunable hydrogen evolution reaction

Aslam, Sehrish; Sagar, Rizwan Ur Rehman; Kumar, Hitanshu; Zhang, Gaowei; Nosheen, Farhat; Namvari, Mina; Mahmood, Nasir; Qiu, Yejun

doi:10.1016/j.chemosphere.2019.125607

Cited by 30 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As described in Figure 9f, the FeCNFs showed better or comparable performance parameters than those of similar HER catalysts from previous reports. [ 48–54 ]…”

Section: Resultsmentioning

confidence: 99%

Surfactant‐in‐Polymer Templating for Fabrication of Carbon Nanofibers with Controlled Interior Substructures: Designing Versatile Materials for Energy Applications

Heo

Noh

Lee

et al. 2021

Small

View full text Add to dashboard Cite

A simple, scalable, surfactant‐in‐polymer templating approach is demonstrated to create controlled long‐range secondary substructures in a primary structure. A metal bis(2‐ethylhexyl) sulfosuccinate (MAOT) as the surfactant is shown to be capable of serving as a sacrificial template and metal precursor in carbon nanofibers. The low interfacial tension and controllable dimensions of the MAOT are maintained in the solid‐phase polymer, even during electrospinning and heat‐treatment processes, allowing for the long‐range uniform formation of substructures in the nanofibers. The MAOT content is found to be a critical parameter for tailoring the diameter of the nanofibers and their textural properties, such as size and volume of interior pores. The metal counterion species in the MAOT determine the introduction of metallic phases in the nanofiber interior. The incorporation of MAOT with Na as the counterion into the polymer phase leads to the formation of a built‐in pore structure in the nanofibers. In contrast, MAOT with Fe as a counterion generates unique iron‐in‐pore substructures in the nanofibers (FeCNFs). The FeCNFs exhibit outstanding charge storage and water splitting performances. As a result, the MAOT‐in‐polymer templating approach can be extended to combinations of various metal precursors and thus create desirable functionalities for different target applications.

show abstract

“…As described in Figure 9f, the FeCNFs showed better or comparable performance parameters than those of similar HER catalysts from previous reports. [ 48–54 ]…”

Section: Resultsmentioning

confidence: 99%

Surfactant‐in‐Polymer Templating for Fabrication of Carbon Nanofibers with Controlled Interior Substructures: Designing Versatile Materials for Energy Applications

Heo

Noh

Lee

et al. 2021

Small

View full text Add to dashboard Cite

show abstract

“…Another interesting material -phosphorene quantum dot modified Prussian blue porous network -with reportedly excellent HER activity was reported by Xia et al Superb electrocatalytic activity in acidic electrolyte were explained in terms of passivation of phosphorene edges by CN-groups in Prussian blue [140]. Knowing that graphene oxide can be completely reduced at the significantly lower overpotentials compared to those needed for HER and that HER at reduced graphene oxide requires large overpotentials, results reported by Aslam et al for HER at graphene foam seem surprising, especially because authors performed detailed characterization and excluded presence of metallic impurities [141].…”

Section: Miscellaneous Materialsmentioning

confidence: 97%

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

Gutić¹,

Dobrota²,

Fako³

et al. 2020

Preprint

View full text Add to dashboard Cite

Hydrogen evolution reaction (HER) is one of the most important reaction in electrochemistry. This is not only because it is the simplest way to produce high purity hydrogen and the fact that it is the side reaction in many other technologies. HER actually shaped current electrochemistry because it was in focus of active research for so many years (and it still is). The number of catalysts investigated for HER is immense, and it is impossible to overview them all. In fact, it seems that the complexity of the field overcomes the complexity of HER. The aim of this review is to point out some of the latest developments in HER catalysis, current directions and some of the missing links between a single crystal, nanosized supported catalysts and, recently emerging, single atom catalysts for HER.3 of 36 HER at single crystal surfaces and bulk surfacesA crystalline solid can be considered as a series of mutually parallel lattice planes, arranged in a periodic way. Close to the surface, the spatial arrangement of the lattice planes, their crystallographic structure, as well as the dynamics of the constituent atoms may differ from the corresponding features in the bulk [1]. Most clean metals show the tendency to minimize their surface energy. One of the mechanisms is relaxation, the shift of one or more lattice planes located near to the surface, usually perpendicularly to the surface, so that the interlayer distance changes compared to the bulk lattice. The other one is reconstruction -change in equilibrium positions and bonding of surface atoms so that the projection of bulk unit cell to the given surface does not correspond to the surface unit cell. Different crystallographic planes (with different Miller indices) of the same metal exhibit unequal surface densities (number of atoms per surface area), and therefore undergo surface relaxation/reconstruction to different extents [2]. For example, Pt(100) has lower surface density compared to densely packed Pt(111) and therefore has a stronger tendency to relax/reconstruct. Since the main driving force for the mentioned surface modifications is the low coordination number (non-saturation) of surface atoms, it is obvious that atom/molecule adsorption on clean metal surfaces can have a significant effect on its surface structure, inducing relaxation/reconstruction changes. This is of huge importance for HER, as it involves adsorbed atomic hydrogen (Hads) as an intermediate. Additionally, in an electrochemical system, the electrode will be modified by adsorption of "spectator" species (ions/molecules from the electrolyte), so HER will not be taking place on clean metal surfaces, but rather on modified ones. Obviously, there is a complex dynamic interplay between the catalyst surface, reactants, intermediates, and electrolyte.According to the Sabatier principle, the interaction of the reaction reactants/intermediates with the catalyst has to be optimal in strength. If it is too weak, the reactants will not bind to the catalyst and the reaction will not be able to take place. In...

show abstract

“…Another interesting material-phosphorene quantum dot modified Prussian blue porous network-with reportedly excellent HER activity was reported by Xia et al Superb electrocatalytic activity in acidic electrolyte was explained in terms of passivation of phosphorene edges by CN-groups in Prussian blue [153]. Knowing that graphene oxide can be completely reduced at the significantly lower overpotentials compared to those needed for HER and that HER at reduced graphene oxide requires large overpotentials, results reported by Aslam et al for HER at graphene foam seem surprising, especially because authors performed detailed characterization and excluded presence of metallic impurities [154].…”

Section: Miscellaneous Materialsmentioning

confidence: 97%

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

et al. 2020

View full text Add to dashboard Cite

Hydrogen evolution reaction (HER) is one of the most important reactions in electrochemistry. This is not only because it is the simplest way to produce high purity hydrogen and the fact that it is the side reaction in many other technologies. HER actually shaped current electrochemistry because it was in focus of active research for so many years (and it still is). The number of catalysts investigated for HER is immense, and it is not possible to overview them all. In fact, it seems that the complexity of the field overcomes the complexity of HER. The aim of this review is to point out some of the latest developments in HER catalysis, current directions and some of the missing links between a single crystal, nanosized supported catalysts and recently emerging, single-atom catalysts for HER.

show abstract

Mixed-dimensional heterostructures of hydrophobic/hydrophilic graphene foam for tunable hydrogen evolution reaction

Cited by 30 publications

References 30 publications

Surfactant‐in‐Polymer Templating for Fabrication of Carbon Nanofibers with Controlled Interior Substructures: Designing Versatile Materials for Energy Applications

Surfactant‐in‐Polymer Templating for Fabrication of Carbon Nanofibers with Controlled Interior Substructures: Designing Versatile Materials for Energy Applications

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

Contact Info

Product

Resources

About