Phosphorus-bridged ternary metal alloy encapsulated in few-layered nitrogen-doped graphene for highly efficient electrocatalytic hydrogen evolution

Abstract

The strategy of combining non-noble metal core and carbon shell can produce a synergistic effect through interface engineering and simultaneously promote the activity and stability of materials. Heteroatomic doping can...

Simultaneous optimization of CoIr alloy nanoparticles and 2D graphitic-N doped carbon support in CoIr@CN by Ir doping for enhanced oxygen and hydrogen evolution reactions

“…36,37 And the broadened peak at around 2700 cm À1 further signies the existence of graphene layers, which is consistent with the TEM image shown above. 15,38,39 The I D /I G (the intensity ratio of D and G bands) values of Co@CN, CoIr@CN-0.15, CoIr@CN-0.20, and CoIr@CN-0.25 are 1.595, 1.776, 1.838, and 1.783, respectively. Obviously, the CoIr@CN-0.20 shows the largest I D /I G , which demonstrates that the Ir introduction could create more defects and disorders in the carbon matrix during the carbonization process, and thus lead to more unsaturated active sites for enhanced electrocatalytic performance.…”

In-situ Synthesis of Nitrogen-doped Graphene Layer Encapsulated Palladium Nanoparticles for Highly Selective Hydrogenation of Vanillin

“…此外, 包覆结构也保护 Pd 纳米颗粒不 被氧化, 提升了催化性能. 在包覆结构中, 由于限域催 化机制, 内核金属颗粒能够将活性价电子注入到石墨烯 壳层, 从而改变纳米结构的表面电子结构, 使外层石墨 烯成为催化的活性位点 [35][36] . 在商业 Pd@N/C 催化剂中 没有看到 Pd 纳米颗粒被石墨烯层包裹的现象, 而是可 以明显地看到 Pd 粒子均匀地分散在碳纳米管中(图 1(f)).…”

Emerging Nonplanar van der Waals Nanoarchitectures from 2D Allotropes for Optoelectronics

“…Solvothermal methods and thermal decomposition methods are the most common preparation methods. [168][169][170][171][172][173] When adopting solvothermal methods, the cores are dispersed in the liquid phase, thus the substrate is not required. The nanoshells are prepared at lower temperatures (<250 °C), avoiding damaging the internal cores.…”

“…The functional cores and corresponding nanoshells are distinguished from TEM and STEM images (Figure 9b-d). [14,[170][171][172][175][176][177][178][179]182] Ideal LBL coating requires suitable temperature, as lateral winged growth may occur at excessively high deposition rates. [176,180,183] If the cores serve only as templates, they should be removed by thermal decomposition or chemical etching after the reaction.…”