New
hierarchical bioinspired nanocomposite materials of poly(vinyl
alcohol)/poly(acrylic acid)/carboxylate graphene oxide nanosheet@polydopamine
(PVA/PAA/GO-COOH@PDA) were successfully prepared by electrospinning
technique, thermal treatment, and polydopamine modification. The obtained
composite membranes are composed of polymeric nanofibers with carboxylate
graphene oxide nanosheets, which are anchored on the fibers by heat-induced
cross-linking reaction. The preparation process demonstrate eco-friendly
and controllable manner. These as-formed nanocomposites were characterized
by various morphological methods and spectral techniques. Due to the
unique polydopamine and graphene oxide containing structures in composites,
the as-obtained composite demonstrate well efficient adsorption capacity
toward dye removal, which is primarily due to the specific surface
area of electrospun membranes and the active polydopamine/graphene
oxide components. In addition, the composite membranes reported here
are easy to regenerate. In comparison with other composite adsorbents,
the preparation process of present new composite materials is highly
eco-friendly and facile to operate and regulate, which demonstrates
potential large-scale applications in wastewater treatment and dye
removal.
Although
organic–inorganic halide perovskite solar cells
(PSCs) have shown dramatically enhanced power conversion efficiencies
(PCEs) in the last decade, their long-term stability is still a critical
challenge for commercialization. To address this issue, tremendous
research efforts have been devoted to exploring all-inorganic PSCs
because of their intrinsically high structural stability. Among them,
CsPbIBr2-based all-inorganic PSCs have drawn increasing
attention owing to their suitable band gap and favorable stability.
However, the PCEs of CsPbIBr2-based PSCs are still far
from those of their organic–inorganic counterparts, thus inhibiting
their practical applications. Herein, we demonstrate that by simply
doping an appropriate amount of Cu2+ into a CsPbIBr2 perovskite lattice (0.5 at. % to Pb2+), the perovskite
crystallinity and grain size are increased, the perovskite film morphology
is improved, the energy level alignment is optimized, and the trap
density and charge recombination are reduced. As a consequence, a
decent PCE improvement from 7.81 to 10.4% is achieved along with an
enhancement ratio of 33% with a CsPbIBr2-based PSC. Furthermore,
the long-term stability of CsPbIBr2-based PSCs against
moisture and heat also remarkably improved by Cu2+ doping.
This work provides a facile and effective route to improve the PCE
and long-term stability of CsPbIBr2-based all-inorganic
PSCs.
Direct ammonia solid oxide fuel cell (DA‐SOFC) is superior to low‐temperature direct ammonia fuel cell using anion exchange membrane because of much improved anode reaction kinetics at elevated temperature. However, significant performance degradation due to severe sintering of conventional nickel cermet anode under operating conditions is a big challenge for realizing its practical use. Herein, a high‐performance anode based on La0.55Sr0.30TiO3−δ (LST) perovskite substrate with its surface decorated with in situ exsolved and strongly coupled NiCo alloy nanoparticles (NPs) is designed and fabricated for DA‐SOFCs, exhibiting superior catalytic activity for NH3 decomposition reaction due to balanced NH3 adsorption and N2 desorption processes. An electrolyte‐supported single cell with infiltrated NiCo/LST on Sm0.2Ce0.8O1.9 scaffold anode delivers a maximum power density of 361 mW cm−2 at 800 °C in NH3 fuel, superior to similar SOFCs with Ni or Co NP‐decorated LST based anodes (161 and 98 mW cm−2). Furthermore, the SOFC with this newly developed anode displays favorable operational stability without obvious performance degradation at 700 °C for a test period of ≈120 h, attributed to its high antisintering capability. This study provides some strategies to develop highly active, stable, and antisintering perovskite‐based nanocomposite for DA‐SOFCs, facilitating the practical use of this technology.
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