Although electrodes based on two dimensional hybrids with interstratification-assemble have been widely studied for supercapacitors, the performance enhancement still remains challenge mainly due to the random dispersion of surface passivated two dimensional nanosheets. Herein, a new covalent surface functionalization of MXene-based Ti 3 C 2 Cl 2 nanodots-interspersed MXene@NiAl-layered double hydroxides (QD-Ti 3 C 2 Cl 2 @NiAl-LDHs) hybrid electrode with superior pseudocapacitor storage performance has been elaborately designed by electrostatic-assembled. As a result, the QD-Ti 3 C 2 Cl 2 @NiAl-LDHs electrode exhibits a super specific capacitance of 2010.8F g −1 at 1.0 A g −1 and high energy density of 100.5 Wh kg −1 at a power density of 299.8 W kg −1 . In addition, 94.1% capacitance retention is achieved after cycling for 10,000 cycles at 1.0 A g −1 , outperforming previously reported of two dimensional hybrids electrode for supercapacitor. Furthermore, density functional theory (DFT) calculations show that the superior pseudocapacitor storage performance of the QD-Ti 3 C 2 Cl 2 @NiAl-LDHs may be attributed to the creation of numerous electrochemical active sites and the enhancement of electrical conductivity by the QD-Ti 3 C 2 Cl 2 MXene. This work provides new strategy for developing excellent pseudocapacitor supercapacitor based on two dimensional hybrid electrode.
Hongmiao Zhou,Jiayi Tian,Ruoyu Wang,Difu Zhan,Peng Liu,Ruolin Chen,Yizhong Huang,Zhifeng Liu,Changcun Han
Photocatalytic hydrogen (H 2 ) evolution is expected to be a promising approach to generating a clean energy source (H 2 ) with low carbon emissions, which is vital to solving environmental degradation and energy shortages. The critical challenge to designing highly efficient photocatalysts is the fast recombination of photo-generated carriers; thus, we select Ti 3 C 2 Cl 2 MXene with excellent metal characteristics to serve as a co-catalyst and combine with g-C 3 N 4 . The Ti 3 C 2 Cl 2 /g-C 3 N 4 composites exhibit an enhanced photocatalytic hydrogen evolution activity (maximum 155.9 μmol h −1 ) while they hardly perform photocatalytic activities. The photoluminescence (PL) spectra shows that Ti 3 C 2 Cl 2 MXenes help boost the separation of photo-generated carriers of g-C 3 N 4 and finally strengthen the photocatalytic hydrogen evolution performance. The ultraviolet–visible (UV–vis) spectra illustrate that composites perform a strengthened light absorption, which fits well with the results in the hydrogen evolution experiment. Thus, we fabricated a highly efficient photocatalyst through a safer molten salt approach without hydrofluoric acid (HF). We believe this work will offer a safer approach to manufacturing catalysts decorated with MXenes for highly efficient photocatalytic H 2 evolution.
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