A single multiwalled carbon nanotube (MWNT)‐glass fiber is used to monitor the initiation and growth of microcracks in composites, which provides an early warning system to detect fracture in materials. An electromechanical microswitch is further constructed based on the connecting/breaking of the nanotube bridges across microcracks under external strain or thermal expansion.

Lithium-ion batteries (LIBs) and potassium-ion batteries (KIBs) have broad application prospects in the fields of small/medium-sized electronic products and largescale energy storage. However, the fast and low reversible capacity decay, poor rate capacity, and slow charge storage kinetics severely affect their large-scale applications. In this work, a Bi 2 Se 3 @C rod-like architecture was synthesized through an in situ selenization method using metal−organic frameworks as the precursor. The micro/nanoporous carbon structure not only offers a stable matrix to ensure electrode integrity but also absorbs a large amount of Bi 2 Se 3 changes during repeated lithiation/potassization processes. In addition, the porous structure frame prevents the agglomeration of Bi 2 Se 3 nanoparticles with larger surface energy and shortens the diffusion path of ion transport, thereby improving the rate performance. Therefore, Bi 2 Se 3 @C shows outstanding lithium/potassium storage properties when applied in lithium/potassium-ion batteries. The study of the electrochemical reaction mechanism shows that partial rhombohedral Bi 2 Se 3 transformed into orthorhombic Bi 2 Se 3 after cycling. Pseudocapacitance contribution promotes the enhancement of the specific capacity and rate properties of the Bi 2 Se 3 @C electrode. The excellent electrochemical performance of the Bi 2 Se 3 @C micro/nanostructure shows that it has promising potential as lithium/potassium-ion battery anode materials.

Conventionally, Ni-based cermets are widely used for SOCs as porous fuel materials due to their excellent electrocatalytic activity, thermal and chemical stability, and cost-effectiveness. [13][14][15] However, redox cycles and carbon depositions on Ni will inevitably occur within the fuel electrode, deteriorating their long-term electrochemical performance and stability. [16] Alternatively, perovskite oxides (ABO 3 ) attract significant attention from the scientific community as new potential candidates, [3,[17][18][19][20] as they exhibit excellent ionic and electronic conductivity as well as redox stability. Among these, Sr 2 FeMoO 6-σ (SFM) double perovskites are especially promising, owing to their outstanding electronic conductivity and carbon deposition tolerance. Unfortunately, their comparatively poor catalytic activity would obstruct their practical applications since AO termination of perovskite oxides with low O-vacancy contents prevents full contact between analytes and the very active B-sites. [21] Therefore, new approaches to overcome such sluggish reaction kinetics are highly required for the efficient design of SOC-based catalysts.Infiltration [22][23][24] and in situ exsolution method [25][26][27][28][29] are both effective approaches to enhance the electrocatalytic activity of perovskite oxides. Although some promising results are obtained, the range of their performance enhancements is very limited because even though more active metal oxides interfaces are created, the sluggish reaction kinetics of the perovskite oxide matrix is still not intrinsically improved. Nevertheless, previous studies have showed that the enhanced reaction kinetics of the SFM matrix could be obviously achieved by element doping, such as Fe. [30][31][32] However, the related mechanism has been rarely investigated, and thus the origin behind the enhanced reaction kinetics is still not clear. Since the improved performance of SFM is closely related to its electronic and structural variations, [33,34] better unraveling of their relationships is urgently desirable, which is not only important for further performance improvement by structural optimizations, but also could provide a general guidance to design new electrocatalysts for high-performance solid oxide cells.Herein, the electronic structures of the SFM are investigated by partial replacement of Mo with Fe ions. The effect of this substitution on the crystal, physical, chemical, and The performance of Sr 2 FeMoO 6-σ double perovskites can be significantly enhanced by optimizing the ratio of Fe/Mo as a promising electrode material for solid oxide fuel/electrolysis cells. However, the intrinsic origin is still doubt for the improvement of Sr 2 FeMoO 6-σ sluggish electrocatalytic reaction kinetics. Herein, their electronic structures are investigated by partial replacement of Mo with Fe ions. As the Fe content in Sr 2 Fe 1+x Mo 1-x O 6-δ is increased, its oxidation state increases, which enhances the metal-oxygen hybridization and shifts its bulk O p band energy toward...

Aim: To compare the clinical and radiographic outcomes of percutaneous endoscopic-assisted lumbar interbody fusion (PELIF) versus oblique lumbar interbody fusion (OLIF) for the treatment of symptomatic low-grade lumbar spondylolisthesis. Material & methods: The clinical and radiographic records of 48 patients underwent single-level minimally invasive lumbar fusion with a PELIF (n = 16) or OLIF (n = 32) were reviewed. Results: The clinical and radiographic outcomes were similar in both groups. PELIF procedure exhibited superior capability of the enlargement of foraminal width, but inferior capability of the restoration of foraminal height than OLIF procedure. Conclusion: PELIF minimizes the iatrogenic damages and perioperative risks to a great extent, and seems to be a promising option for the treatment of symptomatic low-grade lumbar spondylolisthesis.