Combining 2D MoS2 with other transition metal sulfide is a promising strategy to elevate its electrochemical performances. Herein, heterostructures constructed using MnS nanoparticles embedded in MoS2 nanosheets (denoted as MnS‐MoS2) are designed and synthesized as anode materials for lithium/sodium‐ion batteries via a facile one‐step hydrothermal method. Phase transition and built‐in electric field brought by the heterostructure enhance the Li/Na ion intercalation kinetics, elevate the charge transport, and accommodate the volume expansion. The sequential phase transitions from 2H to 3R of MoS2 and α to γ of MnS are revealed for the first time. As a result, the MnS‐MoS2 electrode delivers outstanding specific capacity (1246.2 mAh g−1 at 1 A g−1), excellent rate, and stable long‐term cycling stability (397.2 mAh g−1 maintained after 3000 cycles at 20 A g−1) in Li‐ion half‐cells. Superior cycling and rate performance are also presented in sodium half‐cells and Li/Na full cells, demonstrating a promising practical application of the MnS‐MoS2 electrode. This work is anticipated to afford an in‐depth comprehension of the heterostructure contribution in energy storage and illuminate a new perspective to construct binary transition metal sulfide anodes.
Herein,
we propose a practical way for direct preparation of gallium oxide
nanosheets/reduced graphene oxide (Ga2O3 NSs/rGO)
nanocomposites via oxygenic groups contained hydrophilic graphene
oxide (GO) template with subsequent annealing treatment. Benefiting
from the two-dimensional (2D) nanoarchitecture of Ga2O3 NSs and rGO, Ga2O3 NSs/rGO nanocomposites
exhibit enhanced kinetics and improved cycling stability in Li-ion
and Na-ion batteries (LIBs/SIBs). The pseudocapacitance performance
is authenticated through kinetic analysis. Ex situ XRD and XPS measurements
prove that the reversible Li-ion storage in Ga2O3 NSs/rGO electrodes is a conversion reaction and alloying mechanism.
In addition, the full cells fabricated by coupling Ga2O3 NSs/rGO anode and LiFePO4/C or Na3V2(PO4)3/C cathodes exhibit outstanding
electrochemical performances. In general, such a new approach, which
is not specific to Ga2O3 NSs/rGO nanocomposites,
offers great opportunities for 2D oxide nanomaterials or nanocomposites
as high-performance electrodes.
Lewis acid–base theory and DFT results showed that different enrichment degrees of B and N elements in BCN can improve the adsorption energy of OH*/H2O. BCN exhibits optimum electrocatalytic overall water splitting performance after adjustments.
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