Interfacial engineering of worm-shaped palladium nanocrystals anchored on polyelectrolyte-modified MXene nanosheets for highly efficient methanol oxidation

Three‐Dimensional Porous Low‐Defect Carbon Nanotube and Graphene Network Supported Rh Nanocrystals as Efficient Methanol Oxidation Electrocatalysts

“…As can be seen from Figure 3a–c, the 3D architecture is mainly constructed from numerous slender LCNTs and RGO nanosheets, while the small‐sized Rh nanocrystals are closely attached on their surfaces. Statistical analysis discloses that the average particle diameter of these Rh nanocrystals is determined to be only 2.4 nm, which is comparable or even smaller than that of previously reported Pt and Pd nanostructures [34,35] . Moreover, from the high‐resolution TEM images (Figure 3d–e), the plane spacing of 0.34 nm is corresponding to the carbon (002) plane of LCNT and graphene, while the plane spacing of 0.22 nm is linked to the (111) planes of face‐centered cubic (fcc) Rh nanocrystals.…”

“…Statistical analysis discloses that the average particle diameter of these Rh nanocrystals is determined to be only 2.4 nm, which is comparable or even smaller than that of previously reported Pt and Pd nanostructures. [34,35] Moreover, from the high-resolution TEM images (Figure 3d-e), the plane spacing of 0.34 nm is corresponding to the carbon (002) plane of LCNT and graphene, while the plane spacing of 0.22 nm is linked to the (111) planes of face-centered cubic (fcc) Rh nanocrystals. Additionally, the high-angle annular dark-field scanning TEM (HAADF-STEM) and elemental mapping analysis shown in Figure 3f reveal that all three elements, including C, O and Rh, are uniformly distributed in the Rh/LCNT-RGO architecture, which is in good agreement with the EDX data (Figure S2).…”

Ultrafine Rh nanocrystals immobilized on 3D boron and nitrogen co-doped graphene–carbon nanotube networks: high-efficiency electrocatalysts towards the methanol oxidation reaction

“…The statistical calculation of particle size distribution discloses that the average diameter of these Rh nanoparticles is only 3.6 nm, which is comparable to those reported for recent state-of-the-art Pt-and Pd-based catalysts. 7,13 In addition, the characteristic lattice fringes of Rh nanocrystals, CNTs, and graphene can be clearly observed from the high-resolution TEM (HR-TEM) images (Fig. 2F and G), and each component of the hybrid catalyst has a good crystallinity.…”

“…5,6 In particular, DMFCs have been considered to be a very promising power source in the fields of portable electronic devices, electric vehicles, and aerospace crafts because of their high energy conversion efficiency, wide working temperature range, environmental friendliness, and structural safety. 7,8 As the core component of DMFCs, electrocatalysts effectively enhance the inherently slow kinetics of the anode during the methanol oxidation reaction (MOR), which can contribute directly to the output power density of the fuel cell. 9,10 Therefore, the exploration and utilization of high-performance and low-cost anode catalysts have become the key to the successful commercialization of DMFC systems.…”

Ultrafine cobalt selenide nanowires tangled with MXene nanosheets as highly efficient electrocatalysts toward the hydrogen evolution reaction

“…27,28 Nowadays, 2D Ti 3 C 2 T x MXene nanosheets have become a hotspot in energy conversion and storage due to their outstanding electrical conductivity, impressive electrochemical stability, large specific surface area, and rich surface chemistries. [29][30][31][32][33] Our recent studies have also shown that the incorporation of Ti 3 C 2 T x nanosheets can optimize the electronic structures of metal catalysts and significantly enhance the electrocatalytic activity. [34][35][36] Accordingly, it is reasonable to deduce that the combination of CoSe nanowires with Ti 3 C 2 T x MXene is capable of fully utilizing their distinct textural features as well as generating remarkable synergistic effects, which is beneficial to realize unusual electrochemical perform-ance toward the HER process.…”