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nanoparticles. The so-formed CNH-based hybrid material showed excellent HER activity, durability, and stability even with low loading (~1 wt%) of Pt, which was approximately 40 times lower than commercial 40 wt% Pt/C. The hybrid’s HER efficiency was comparable to 40 wt% Pt/C as well as to Pt/MoS2-based electrocatalysts consisting of 10 and 2.03 wt% Pt. In addition, the Volmer–Heyrovsky mechanism was found to be the rate-limiting step for as-prepared catalyst, whereas for Pt/C, the Nanomaterials 2020, 10, 1407 15 of 26 Volmer–Tafel mechanism characterizes the kinetics of the reaction. Fiigure 4.. Schematic representation of the covalent bonding of PAMAM dendriimers encapsullatiing Pt n na an no op pa ar rttiic clle es s o on n o ox xiid diiz ze ed d C CN NH Hss. . As far as the OER concerns, to the best of our knowledge, there is only a single report concerning The role of CNHs as electrocatalytic supports for MoS2 and polydopamine (PDA)/Pd CNHs. So far, the best OER activities have been reported for metal oxides such as ruthenium and nanoparticles was also studied and their performance towards HER was evaluated [140]. The iridium oxides. In seeking to take distance from these expensive and scarce materials, a double core-shell catalytic system combining N-doped CNHs, MOF, and Ni nanoparticles (N-CNH-Ni-MOF) was prepared by a simple hydrothermal reaction [150]. Incorporation of CNHs helps to overcome the poor stability of MOFs in high temperatures and polar solvents, while it also improves conductivity. On the other hand, the introduction of MOFs gives CNHs massive active sites on their surface, which could significantly promote their catalytic property. Hence, dopamine was self-polymerized to introduce multiple chemical functional groups on the CNHs surface and direct the nucleation and growth of MOFs, leading to well-defined core-shell structures. Furthermore, Ni nanoparticles were introduced to the catalyst by pyrolyzing the material, while treatment of dopamine in elevated temperatures led toPDF Image | Carbon Nanohorn-Based Electrocatalysts for Energy Conversion
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