Facile construction of core–shell Carbon@CoNiO2 derived from yeast for broadband and high-efficiency microwave absorption

Energy Storage Kinetics of Hierarchically Designed Co9S8@CoNiO2 Hollow Cubic Supercapacitors with Improved Stability and Energy Density

“…In Figure c, the S 2p peaks at 161.9 and 163.3 eV correspond to the S 2p 3/2 and S 2p 1/2 orbitals in Co 9 S 8 . , The Co 2p spectrum in Figure d shows that there are two valence states of Co in Co 9 S 8 @CoNiO 2 . The peaks at 778.7 and 794.6 eV correspond to 2p 3/2 and 2p 1/2 of Co 3+ in Co 9 S 8 , ,, while that at 781.2 and 797.4 eV are attributed to 2p 3/2 and 2p 1/2 of Co 2+ in CoNiO 2 , as shown in Figure d. , Clearly, multivalent Co and their redox pairs (Co 2+ /Co 3+ ) are evidenced, which can effectively improve the electrochemical performance, as shown in Figure e. Similarly, in Figure e, two distinct peaks at 855.3 and 873.2 eV are the electronic states of 2p 1/2 and 2p 3/2 of Ni 2+ . , The O 1s spectrum of Co 9 S 8 @CoNiO 2 exhibits two peaks centered at 530.2 and 531.9 eV, which are consistent with lattice oxygen and defective oxygen, respectively, as shown in Figure f. − …”

“…The peaks at 778.7 and 794.6 eV correspond to 2p 3/2 and 2p 1/2 of Co 3+ in Co 9 S 8 , 42,47,48 while that at 781.2 and 797.4 eV are attributed to 2p 3/2 and 2p 1/2 of Co 2+ in CoNiO 2 , as shown in Figure 2d. 49,50 Clearly, multivalent Co and their redox pairs (Co 2+ /Co 3+ ) are evidenced, which can effectively improve the electrochemical performance, as shown in Figure 2e. Similarly, in Figure 2e, two distinct peaks at 855.3 and 873.2 eV are the electronic states of 2p 1/2 and 2p 3/2 of Ni 2+ .…”

Well-Dispersed CoNiO2 Nanosheet/CoNi Nanocrystal Arrays Anchored onto Monolayer MXene for Superior Electromagnetic Absorption at Low Frequencies

“…Third, the complex hierarchical heterostructure h ders the agglomeration of MXene and magnetic components and guarantees sufficient The EM absorption mechanism of multicomponent monolayer MXene nanoflakes loaded with magnetic nanosheets and nanoparticles is illustrated in Figure 8. First, the anisotropy energy induced by the petal-like CoNiO 2 magnetic nanosheets and uniformly ultrafine CoNi magnetic nanocrystals can magnify low-frequency magnetic loss capacity through eddy current loss, natural resonance, and exchange resonance [53,54]. Second, the multi-component magnetic arrays with poor conduct can also constrain the excessive permittivity of MXene.…”

Entropy‐Driven Morphology Regulation of MAX Phase Solid Solutions with Enhanced Microwave Absorption and Thermal Insulation Performance

“…Aside from the composition and structural defects, the morphology also plays a pivotal role in improving the EM wave absorption properties. [26][27][28] However, tuning rationally the morphology of HE MAX phases remains challenging due to the intricacies involved in their preparation process. Affected by the anisotropy structure, there is a significant difference in crystal surface compositions along the (11_00) and (0001) facets of the MAX phases.…”