PtPd alloy embedded in nitrogen-rich graphene nanopores: High-performance bifunctional electrocatalysts for hydrogen evolution and oxygen reduction

Entropy‐Maximized Synthesis of Multimetallic Nanoparticle Catalysts via a Ultrasonication‐Assisted Wet Chemistry Method under Ambient Conditions

“…In Figure b, HEA‐NPs/carbon‐700 °C exhibits a Tafel slope value of 62 mV dec −1 , which is smaller than commercial Pt/C (77 mV dec −1 ), PtAuPdRh/carbon‐700 °C (91 mV dec −1 ) and PtAuPd/carbon‐700 °C (177 mV dec −1 ). With less than 0.03 mg cm −2 loading of active metal, the operating potential −0.37 V to deliver 100 mA cm −2 is better than several noble metallic electrocatalysts yet reported . As compared, Pt catalysts are measured with a Tafel slope of 116 mV dec −1 in alkaline solution (0.1 m NaOH) .…”

“…As discussed in recent papers, the HER catalytic activity in alkaline solutions is more difficult than in acidic solution, which is ascribed to weaker H/OH‐binding and a higher energy barrier for water dissociation on the catalyst surface . Modulating the electronic and geometric structures of the catalysts is a workable strategy to enhance HER catalytic performance, as seen from the results of various shape‐controlled bimetallic nanocatalysts . The synergistic effects of the different metals in multimetallic catalysts generally exhibit enhanced performance than monometallic materials in electrocatalytic reactions.…”

A review of nanocarbons in energy electrocatalysis: Multifunctional substrates and highly active sites

“…In general, the encapsulation-induced confinement effect is demonstrated to decrease the local work function, increase the DOS near Fermi level, and enhance the chemical reactivity of the modified region of the CNT exterior. The resultant electron transfer and performance enhancement have http://engine.scichina.com/doi/10.1016/j.jechem.2017.08.008 been widely revealed in various systems, such as N-doped carbon shell@Fe nanoparticles for ORR [138,142] , N-doped CNT@Co nanoparticles for ORR/OER [144,145] , N-doped graphene@PtPd alloy for HER/ORR [146] , N-enriched mesoporous carbon@CuCo alloy for ORR/HER [147] , graphene@FeNi alloy for OER [140] , N, O, S tri-doped carbon@Co 9 S 8 for ORR/OER [148] , N-doped graphene@ γ -Fe 2 O 3 for ORR [149] , etc.…”

Enhanced Oxygen Reduction Activity on Carbon Supported Pd Nanoparticles Via SiO2

“…[2b,3] Among these strategies, palladium has attracted considerable attention for replacing the platinum [4] in anodes and cathodes of PEMFCs because of its more abundant reserves and similarities with Pt, as well as its low cost. [5] Furthermore, palladium exhibits high efficiency catalytic activity for alcohol oxidation in alkaline medium and high tolerance of CO poisoning. [6] A lot of studies have been conducted on Pd [7] by changing its electronic structures in order to improve the catalytic activity.…”