Achieving strong electromagnetic enhancement is critical for realizing strong light−matter coupling at the nanoscale. In this study, we constructed a hybrid anapole system composed of a nanohole silicon disk and a longitudinal bonding dipole plasmon mode-supported plasmonic dimer. Compared with the bare dimer plasmon, the hybrid system shows strong plasmonic resonance tuning ability, and its resonance peak can be tuned to the nearinfrared region only by adjusting the radius of the silicon disk. Meanwhile, the E-field enhancement in the gap region can exceed four orders of magnitude without sacrificing the quality factor of the system. Furthermore, it is demonstrated that the emitter's radiative decay rate enhancement in the hybrid system is much higher than that of a similar LBDP mode-supported plasmonic dimer nanodisk and the reported plasmonic nanocavity. In summary, our hybrid anapole systems combine the advantages of metal plasmonic nanodimers and conventional anapole mode-supported systems and avoid their disadvantages. This study provides a useful reference for the further exploration of single-photon emission sources, light harvesting, and other quantum nanophotonic applications.

This study systematically investigated the effects of a single B-site dopant (Fe, x = 0–1.0) on the structure and oxygen reduction reaction of the Ba0.9K0.1CoO3−δ (BKC) material used as a cathode for low-temperature solid oxide fuel cells (LT-SOFCs). The structural, electronic, and electrocatalytic properties of the cathode materials prepared by a sol–gel method were comparatively characterized. The results indicated that cubic perovskite structure BKF x C (Fe, x = 0.5, 0.6) materials had been formed by calcination at 900 °C for 5 h. Moreover, in order to examine the electrochemical properties of BKF x C, the BKF x C cathode was constructed on the Sm0.075Nd0.075Ce0.85O2−δ (SNDC) electrolyte (BKFC/SNDC/BKFC: denoted as symmetric cells); the lowest polarization resistance (R P) was obtained for the BKF0.5C symmetric cell (1.6 Ω·cm2 at 550 °C), which demonstrated much higher electrocatalytic activity than that of a similar cell with the BKF0.6C cathode (2.87 Ω·cm2 at 550 °C). A single cell with the BKF0.5C cathode achieved a top power density of 752 mW·cm–2 at 550 °C, which is 0.35 times higher than that of the single cell with the BKF0.6C cathode (power density: 556 mW·cm–2). The corresponding total interface R P of the fuel cell was 0.303 Ω·cm2, lower than that of the doping amount of 0.6 (550 °C, 0.402 Ω·cm2). Meanwhile, O2 temperature-programmed desorption (O2-TPD) and thermogravimetric (TG) analysis were used to characterize the valence of Fe and Co changing from +4 to +3 as well as the stable structure of the material from room temperature to 600/1000 °C. As a result, a highly efficient method for the innovative BKFC cathode was developed in this work.