A novel low-temperature sealing method was developed to seal solid oxide fuel cells. The 3D Ni nanosheet array was pre-fabricated on faying surfaces of Crofer22APU interconnect and NiO-YSZ anode-support. Then it was covered with Au film without changing its morphology. This special nanostructure improved sintering efficiency between Ag nanoparticles and substrates. A dense joint was obtained at the low-temperature between 250 °C–300 °C. This method effectively avoided the oxidation of interconnect during sealing. When joints were sealed at 300 °C, the shear strength reached 16 MPa. The fracture was mainly located in the central Ag layer, presenting a significant plastic deformation. Due to the effective protection of Ni layer, joints also possessed excellent oxidation resistance in oxidizing atmosphere at 800 °C for 400 h. After high-temperature oxidation, the shear strength was increased to 23 MPa, revealing an increasement of 43.8% compared with the as-sealed condition (16 MPa). This sealing method has great potential in sealing solid oxide fuel cells. It also can be extended to seal other energy-conversion devices.

开发了一种新颖的低温密封方法来密封固体氧化物燃料电池。将3D Ni纳米片阵列预制在Crofer22APU互连和NiO-YSZ阳极支撑的接合表面上。然后在不改变其形态的情况下用金膜覆盖。这种特殊的纳米结构提高了银纳米颗粒与基材之间的烧结效率。在250°C–300°C的低温下获得了致密的接头。该方法有效地避免了密封期间互连件的氧化。当接头在300°C下密封时，剪切强度达到16 MPa。裂缝主要位于中央银层，表现出明显的塑性变形。由于镍层的有效保护，接头在800℃，400 h的氧化气氛中也具有出色的抗氧化性。高温氧化后，剪切强度增加到23 MPa，与密封状态（16 MPa）相比，增加了43.8％。这种密封方法在密封固体氧化物燃料电池中具有很大的潜力。它也可以扩展为密封其他能量转换设备。