High power density performance at intermediate (600 °C–450 °C) temperatures (IT) must be considered in the development of solid oxide fuel cell (SOFC). A niobium and tantalum co-doped perovskite material SCNT (SrCo 0. 8 Nb 0 . 1 Ta 0 . 1 O 3-δ ) can be used as a cathode for IT-SOFC due to its (H + /O 2− /e − ) triple conduction and promising catalysis activity. In this work, the SCNT was composited with ionic conductor SCDC(Ce 0.8 Sm 0.05 Ca 0 . 15 O 2-δ ) and processed as electrolyte membrane into semiconductor-ionic membrane fuel cell (SIMFC), which delivered an appreciable performance at IT, i.e., a peak power output of 1016 mW/cm 2 at 550 °C and 401 mW/cm 2 at 450 °C, respectively. The high performance mainly originated from the (H + /O 2− ) dual-ion conduction of SCNT as well as the high oxygen ion conductivity of SCDC, the SCNT-SCDC electrolyte layer adjacent to cathode have promoted the oxygen reduction reaction (ORR) with some extent because of the excellent catalysis activity of SCNT. Moreover, the on-line generated carbonate suppressed the electronic conductivity and resulted in the attractive density of SCNT-SCDC electrolyte to further contribute to the desired cell performance.
Two-dimensional titanium carbide has gained considerable attention in recent years as an electrode material for supercapacitors due to its high melting point , good electrical conductivity , hydrophilicity and large electrochemically active surfaces. However, the irreversible restacking during synthesis restricts its development and practical applications. Here, Ti 3 C 2 T x /SCNT self-assembled composite electrodes were rationally designed and successfully synthesized by introducing single-walled carbon nanotubes (SCNTs) as interlayer spacers to decrease the restacking of the Ti 3 C 2 T x sheets during the synthesis process. SCNTs can not only increase the specific surface area as well as the interlayer space of the Ti 3 C 2 T x electrode, but also increase the accessible capability of electrolyte ions , and thus it improved the electrochemical performance of the electrode. The as-prepared Ti 3 C 2 T x /SCNT self-assembled composite electrode achieved a high areal capacitance of 220 mF/cm 2 (314 F/cm 3 ) and a remarkable capacitance retention of 95% after 10,000 cycles.
Cencong Wang,Gaosheng Li,Yang Hu,Wenji Li,Quanling Yang,Chuanxi Xiong,Zhuqun Shi
Traditional cellulose-based sensors often suffer from limitations such as inadequate compression resilience and environmental instability, particularly under humid conditions. To address these issues, a hydrophobic and elastic nanocellulose/sulfonated carbon nanotube (SCNT) aerogel with a layered structure was fabricated via a one-pot synthesis. The incorporation of the SCNT facilitates the formation of a conductive network within the aerogel. Consequently, when the aerogel undergoes deformation under applied pressure, alterations in the conductive pathway induce a corresponding and measurable change in the electrical resistance. In comparison to unmodified nanocellulose aerogels, the developed aerogels exhibit significantly enhanced surface and internal hydrophobicity (water contact angle all over 130°), leading to improved structural integrity even in humid environments. Furthermore, the hydrophobic TOCN aerogel with 1 wt % SCNT content demonstrates a high compressive strength retention rate of 92% at 50% deformation, a sensitivity of 1.15 kPa–1, a rapid response time of 100 ms, and exceptional cycling stability exceeding 10,000 cycles. Due to its outstanding elasticity and hydrophobicity, the modified aerogel achieves significantly greater stability, broadening its applicability in sensors.
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