Ir Single Atom Catalyst Loaded on Amorphous Carbon Materials with High HER Activity

Abstract

The research of high efficiency water splitting catalyst is important for the development of renewable energy economy. Here, the progress in the preparation of high efficiency hydrogen evolution reaction (HER) catalyst is reported. The support material is based on a polyhexaphenylbenzene material with intrinsic holes, which heals into carbon materials upon heating. The healing process is found to be useful for anchoring various transition metal atoms, among which the supported Ir Single‐atom catalyst (SAC) catalyst shows much higher electrocatalytic activity and stability than the commercial Pt/C and Ir/C in HER. There is only 17 mV overpotential at 10 mA cm–2, which is significantly lower than that of commercial Pt/C and Ir/C catalysts respectively by 26 and 3 mV, and the catalyst has an ultra‐high mass activity (MA) of 51.6 AmgIr−1${\text{ A mg}}_{{\rm{Ir}}}^{ - 1}$ at 70 mV potential and turn over frequencies (TOF) of 171.61 s–1 at the potential of 100 mV. The density functional theory (DFT) calculation reveals the significant role of carbon coordination around the Ir center. A series of monatomic PBN‐300‐M are synthesized by using of designed carbon materials. The findings provide an enabling and versatile platform for facile accessing SACs toward many industrial important reactions.

Strong Electronic Metal–Support Interaction between Iridium Single Atoms and a WO3 Support Promotes Highly Efficient and Robust CO2 Cycloaddition

“…The high‐resolution Ir 4f XPS spectrum of Ir 1 –WO 3 exhibits a doublet with the 4f 7/2 peak centered at 62.7 eV, indicating an Ir valence state close to 4+ ( Figure a). [ 27 ] By contrast, the Ir 4f doublet of Ir 1 –CeO 2 and Ir 1 –TiO 2 noticeably shifts toward lower binding energy. [ 28 ] This implies a stronger electronic interaction between the Ir single atoms and the oxide support in Ir 1 –WO 3 , affording more significant metal‐to‐support electron transfer, compared to Ir 1 –CeO 2 and Ir 1 –TiO 2 .…”

Surface-Regulated Platinum–Copper Nanoframes in Electrochemical Reforming of Ethanol for Efficient Hydrogen Production

“…Furthermore, the electrochemical impedance spectroscopy (EIS) responses of PtCu NF/C and the commercial Pt/C were also investigated to evaluate the performance (Figure S9b). It is obvious that the PtCu NF/C has the smaller semicircle radius, corresponding to the lower charge-transfer resistance, resulting in the higher charge-transfer rate and faster catalytic kinetics than the commercial Pt/C. ,− …”

Carbon Material With Ordered Sub-Nanometer Hole Defects

“…Finally, we obtained the anticipated polyhexabenzocoronene network ( PBN ). More synthetic details and structural confirmation are provided in our another manuscript ( Liu et al, 2022 ).…”