The
development of redox-targeting co-catalysts is one of the important
tasks in realizing hybrid photocatalytic systems for CO2 reduction reaction (CO2 RR), which has been sought after
as a promising way to mitigate the energy and environmental crisis.
In this study, hollow nickel hydroxide nanocages are successfully
fabricated via an ion-assisted etching protocol using ZIF-8 as the
structural template, and they are used as cocatalysts along with a
molecular photosensitizer and sacrificial electron donor for reducing
visible-light CO2. A remarkable CO evolution rate of 1.44
× 105 μmol·g ‑1
co‑cat·h–1, a CO selectivity of 96.1%, and a quantum
efficiency of 2.50% are achieved using the optimal cavernous structure
with thin walls, attributing to the significantly improved light harvest
owing to multiple light reflection and scattering, static electron
transfer, abundant surface oxygen vacancies, as well as coherent energy
flow among well-aligned band levels. This study highlights the design
and development of hollow entities toward CO2 RR and provides
insights into the structure-mediated photocatalytic response.
Carbon-based nanocomposites have been extensively studied in energy storage and conversion systems because of their superior electrochemical performance. However, the majority of metal oxides are grown on the surface of carbonaceous material. Herein, we report a different strategy of constructing V2O5 within the metal organic framework derived carbonaceous dodecahedrons. Vanadium precursor is absorbed into the porous dodecahedron-shaped carbon framework first and then in situ converted into V2O5 within the carbonaceous framework in the annealing process in air. As cathode materials for lithium ion batteries, the porous V2O5@C composites exhibit enhanced electrochemical performance, due to the synergistic effect of V2O5 and carbon composite.
The
deployment of Li metal batteries has been significantly tethered
by uncontrollable lithium dendrite growth, especially in heavy-duty
operations. Herein, we implement an in situ surface
transformation tactic exploiting the vapor-phase solid–gas
reaction to construct an artificial solid-electrolyte interphase (SEI)
of Li2Se on Li metal anodes. The conformal Li2Se layer with high ionic diffusivity but poor electron conductivity
effectively restrains the Li/Li+ redox conversion to the
Li/Li2Se interface, and further renders a smooth and chunky
Li deposition through homogenized Li+ flux and promoted
redox kinetics. Consequently, the as-fabricated Li@Li2Se
electrodes demonstrate superb cycling stability in symmetric cells
at both high capacity and current density. The merits of inhibited
dendrite growth and side reactions on the stabilized Li@Li2Se anode are further manifested in Li–O2 batteries,
greatly extending the cycling stability and energy efficiency.
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