Perovskite oxides show great promise in the field of water electrolysis due to their low cost and tailorable properties. However, their performance is seriously constrained by crystal agglomeration. Herein, a high-entropy strategy is reported to regulate the lattice strain field, endowing the crystal with a high energy barrier and optimizing its surface properties to achieve conformal growth of highly reactive perovskite oxides. A range of characterization methods and theoretical calculations are used to investigate the lattice distortion-induced complex lattice strain field and the effective activation strategy of the cocktail effect. Based on this, the produced rod-like La(CoFeNiCrAl)O 3 (La5B–Al) exhibits a low overpotential of 285 mV at 10 mA cm −2 in 1 M KOH. This work provides a novel strategy to use the lattice strain field for regulating the growth of catalysts and clarifies the relationship between high-entropy effects and material properties.
Jiaping Tang,Cuiying Dai,Ze Wen,Mei Yang,Hongbin Gao,Weiguo Mao,Zhuo Wang,Junan Pan,Yong Pan
SnO 2 /Gr composite as anode material for lithium-ion batteries was synthesized by an acoustic-chemical method followed by an annealing treatment. The composite exhibits high crystallinity and purity, and the weight ratio of SnO 2 is controllable. Benefit from the compound effect between material components, the SnO 2 /Gr anodes give notable reaction kinetics and cycling stability. The specific capacity of the composite with 27.4 wt% SnO 2 remains 649.9 mA h g −1 after 170 cycles at 200 mA g −1 . The strain field features in the symmetrical SnO 2 /Gr electrodes were in-situ measured during electrochemical cycles by digital image correlation technique . The distribution and variation characterizations of diffusion induced stress in the symmetrical SnO 2 /Gr electrodes were obtained by using mechano-electrochemical coupling constitutive equation. Furthermore, the contributions of the electrochemical and mechanical stress parts to the plane stress in the symmetrical SnO 2 /Gr electrodes also be discussed, respectively. The results and analytical method are critical for further revealing the failure mechanism and optimizing architecture of the SnO 2 /Gr electrodes for lithium-ion batteries.
Rechargeable aluminum batteries (RABs) are promising in the energy storage fields owing to their high theoretical capacity, abundant resources, and high safety. However, the intrinsically high-charge-density of aluminum ions (Al 3+ , 364C mm −3 ), inevitably leads to large lattice strain and low electron transfer efficiency towards conventional cathodes, such as transition metal sulfides, with inferior performance. To overcome the inherent confinement, we first-timely propose the high-entropy sulfides (HESs) as the novel cathodes in RABs, exhibiting robust lattice tolerance and accelerated multi-path electron transfer. Benefiting from the interaction of multiple atoms and inherent long-range disorder in HESs, broadened atomic d-band ( ɛ d ) endows the local “electronic delocalization effect” with a high rate-capacity (above 193.0 mAh g −1 at 5.0 A g −1 ). Moreover, the well-constructed cathode forms a strong lattice strain field, providing one of the best long-term stabilities (0.004 % per cycle capacity decay over 12,000 cycles at a high current density of 5.0 A g −1 ) in RABs. Overall, the newly developed HESs with lattice distortion and cocktail effect endowing tunable electronic structures pave the new direction for RABs and other multivalent ion batteries.
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