Lithium‐sulfur batteries (LSBs) have been regarded as a competitive candidate for next‐generation electrochemical energy‐storage technologies due to their merits in energy density. The sluggish redox kinetics of the electrochemistry and the high solubility of polysulfides during cycling result in insufficient sulfur utilization, severe polarization, and poor cyclic stability. Herein, sulfiphilic few‐layered MoSe2 nanoflakes decorated rGO (MoSe2@rGO) hybrid has been synthesized through a facile hydrothermal method and for the first time, is used as a conceptually new‐style sulfur host for LSBs. Specifically, MoSe2@rGO not only strongly interacts with polysulfides but also dynamically strengthens polysulfide redox reactions. The polarization problem is effectively alleviated by relying on the sulfiphilic MoSe2. Moreover, MoSe2@rGO is demonstrated to be beneficial for the fast nucleation and uniform deposition of Li2S, contributing to the high discharge capacity and good cyclic stability. A high initial capacity of 1608 mAh g−1 at 0.1 C, a slow decay rate of 0.042% per loop at 0.25 C, and a high reversible capacity of 870 mAh g−1 with areal sulfur loading of 4.2 mg cm−2 at 0.3 C are obtained. The concept of introducing sulfiphilic transition‐metal selenides into the LSBs system can stimulate engineering of novel architectures with enhanced properties for various energy‐storage devices.
Atomic interface regulation that can efficiently optimize the performance of single‐atom catalysts (SACs) is a worthwhile research topic. The challenge lies in deeply understanding the structure–properties correlation based on control of the coordination chemistry of individual atoms. Herein, a new kind of W SACs with oxygen and nitrogen coordination (W‐NO/NC) and a high metal loading over 10 wt% is facilely prepared by introducing an oxygen‐bridged [WO4] tetrahedron. The local structure and coordination environment of the W SACs are confirmed by high‐angle annular dark‐field scanning transmission electron microscopy, X‐ray photoelectron spectroscopy, and extended X‐ray absorption fine structure. The catalyst shows excellent selectivity and activity for the electrochemical nitrogen reduction reaction (NRR). Density functional theory calculation reveals that unique electronic structures of the N and O dual‐coordinated W sites optimize the binding energy of the NRR intermediate, resulting in facilitating the electrocatalytic NRR. This work opens an avenue toward exploring the correlation between coordination structure and properties.
Phase engineering of transition metal dichalcogenides is of prominent significance for their electrocatalytic performance. Herein, we report a facile and scalable N2-plasma strategy to promote the phase transformation of MoS2...
A single DNA molecule detection method on DNA tetrahedron decorated substrates has been developed. DNA tetrahedra were introduced onto substrates for both preventing nonspecific adsorption and sensitive recognition of single DNA molecules.
Ni12P5 nanoparticles grown on graphene strengthen the sulfur kinetics and alleviate the shuttle effect of polysulfides in lithium–sulfur batteries, resulting in a highly stable cycling.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.