Hu Haotian, Li Mai, Xu Wendong, Li Chenxi, Irfan Ayesha, Ullah Inaam, Ul Hasan Waqar, Deng Qinglin, Meng Zheyi, He Jun, Sun Zhongyi, Peng Xiang
College of Science, Donghua University, Shanghai 201620, China.
School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.
ACS Appl Mater Interfaces. 2025 Apr 23;17(16):23834-23847. doi: 10.1021/acsami.4c22281. Epub 2025 Apr 11.
Developing high-performance materials for energy storage and water splitting remains a significant challenge in energy research. Metal selenides, such as CdSe, exhibit excellent electrical conductivity and electrochemical activity, but they tend to form aggregates. Two-dimensional (2D) TiCT MXene has good stability and conductivity but is limited by its low capacitance and electrocatalytic performance. To address these issues, CdSe@TiCT composites were synthesized by a two-step large-scale hydrothermal method, where CdSe nanoparticles were uniformly grown on TiCT MXene nanosheets. The composites significantly enhance the specific capacity, ion mobility, cycling stability, and catalysis activity due to the synergistic effect between TiCT and CdSe nanoparticles. In a three-electrode system, the composites achieve a specific capacitance of 1847 F g at 0.125 mA cm and retain 89.2% of their capacitance after 10 000 cycles, demonstrating superior electrochemical properties compared to those of CdSe- or TiCT-based electrodes. The asymmetric supercapacitor (ASC) with CdSe@TiCT as the positive electrode and activated carbon (AC) as the negative electrode has a specific capacitance of 219.1 F g, a capacity retention of 88.1% after 5000 cycles, and an energy density of 45.8 W kg. This research also analyzes the reasons for the performance enhancement from the perspective of density of states theory. Furthermore, the CdSe@TiCT composite shows catalytic potential for water splitting, with overpotentials of 201 mV for the hydrogen evolution reaction (HER) and 276 mV for the oxygen evolution reaction (OER). These results suggest that 2D MXene-based CdSe is a promising candidate for energy storage and water splitting.
开发用于能量存储和水分解的高性能材料仍然是能源研究中的一项重大挑战。金属硒化物，如CdSe，具有优异的导电性和电化学活性，但它们容易形成聚集体。二维（2D）TiCT MXene具有良好的稳定性和导电性，但其低电容和电催化性能限制了它的应用。为了解决这些问题，通过两步大规模水热法合成了CdSe@TiCT复合材料，其中CdSe纳米颗粒均匀生长在TiCT MXene纳米片上。由于TiCT和CdSe纳米颗粒之间的协同效应，该复合材料显著提高了比容量、离子迁移率、循环稳定性和催化活性。在三电极系统中，该复合材料在0.125 mA cm时的比电容达到1847 F g，在10000次循环后仍保留其电容的89.2%，与基于CdSe或TiCT的电极相比，显示出优异的电化学性能。以CdSe@TiCT为正极、活性炭（AC）为负极的不对称超级电容器（ASC）的比电容为219.1 F g，在5000次循环后的容量保持率为88.1%，能量密度为45.8 W kg。本研究还从态密度理论的角度分析了性能增强的原因。此外，CdSe@TiCT复合材料显示出对水分解的催化潜力，析氢反应（HER）的过电位为201 mV，析氧反应（OER）的过电位为276 mV。这些结果表明，基于二维MXene的CdSe是能量存储和水分解的有前途的候选材料。
