Pt nanodendrites with (111) crystalline facet as an efficient, stable and pH-universal catalyst for electrochemical hydrogen production

Platinum Nanocrystal Assisted by Low‐Content Iridium for High‐Performance Flexible Electrode: Applications on Neural Interface, Water Oxidation, and Anti‐Microbial Contamination

“…In order to study the kinetics information of the as-prepared electrocatalysts, Tafel slopes were obtained from their corresponding LSV polarization curves, which could disclose the rate-determining step (RDS) toward OER of the electrocatalysts. [56,58] As shown in Figure 8b, the resulting Tafel slope of IrO x /Pt flower coated microelectrode was 41.1 mV dec -1 that was much lower than that of bare Pt (227.4 mV dec -1 ) and Pt flower (162.9 mV dec -1 ) coated microelectrodes. This observation indicated that low-content Ir helped IrO x /Pt flower coated microelectrode achieve outstanding intrinisic OER kinerics, because of the dramatic increase of OER velocity within the same increased potential compared with the other two electrodes.…”

“…[56,57] In our previous work, we have already developed Pt nanocrystals through direct electrodeposition, presenting great potentiality toward HER. [58] However, the electrolytic efficiency of water is constrained by the high overpotential of the OER. [42,44] Herein, we utilized the as-prepared IrO x /Pt flower coated microelectrode to further study the electroactalytic OER activity, where single-channel microelectrodes of the same diameter were employed.…”

“…The polarization curve is an essential certification to estimate the electrocatalysts. [42,58] It could be seen from the LSV polarization curves displayed in Figure 8a that Pt flower coated microelectrode exhibited improved OER activity compared to the bare Pt one, corresponding to an onset overpotential of ≈145 mV and 220 mV versus RHE. Interestingly, our bare Pt microelectrode even showed slightly more positive electrocatalytic activity toward OER than the benchmarked catalyst of IrO 2 /C (240 mV) as reported in the literature.…”

“…The durability of the electrocatalyst was another key parameter for practical applications. [44,56,58] The electrocatalytic stability of IrO x /Pt flower coated microelectrode was examined by the chronopotentiometric measurement under 10 mA cm -2 current density in 0.5 m H 2 SO 4 . Figure 8d illustrates the polarization curves of a IrO x /Pt flower coated microelectrode before and after 12 h galvanostatic test.…”

Ultralong-lifetime Ti/RuO2–IrO2@Pt anodes with a strong metal–support interaction for efficient electrochemical mineralization of perfluorooctanoic acid

“…Schmidt et al 37 found that both the reaction rate and the enantioselectivity increased with the increase of the ratio of Pt (111) to Pt (100) in enantioselective hydrogenation on Pt (100) and Pt (111) nanoparticles. Sun et al 38 synthesized an efficient, stable, and pH-universal catalyst for electrochemical hydrogen production, and its outstanding activity towards the hydrogen evolution reaction was brought by the large electrochemically active area and the exposed (111) facet of Pt. The presence of Pt (111) facets may promote the degradation of PFOA, which is also proved in the following study.…”