Iridium substitution in nickel cobaltite renders high mass specific OER activity and durability in acidic media

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

“…Pt and Ir/Ru-based nanocatalysts are emerging as the state-of-the-art metal catalysts for HER and OER in PEMWE, respectively [2, [18][19][20][21][22]. However, these catalysts feature moderate intrinsic electrocatalytic activity with sluggish kinetics of HER and OER, and low durability in harsh acidic media and high cost, discouraging their large-scale applications [23][24][25]. Therefore, numerous scientific research efforts have been devoted to investigating and designing efficient noble metal nanocatalysts with high electrocatalytic activity, long-term stability and the use of non-noble metals.…”

“…Therefore, numerous scientific research efforts have been devoted to investigating and designing efficient noble metal nanocatalysts with high electrocatalytic activity, long-term stability and the use of non-noble metals. Alloying Ir with transition group metals [19,[24][25][26][27][28][29][30][31][32][33][34] is generally regarded as an effective strategy that not only substantially reduces the usage of Ir but also facilitates the catalytic activity and stability for water splitting by tuning the d-band structure and oxygen adsorption energy on the surface of Ir. Another strategy to optimize the overall catalytic activity is to tune the geometric shape of the nanocatalysts [18,[35][36][37][38][39][40][41][42].…”

Ultrafine Defective RuO2 Electrocatayst Integrated on Carbon Cloth for Robust Water Oxidation in Acidic Media

“…Actually, we have considered different ZnCl 2 contents of the precursor solution and achieved the optimized OER activity at the ZnCl 2 content of 0.40 g ( Figure S11, Supporting Information). [51,52] The electrochemical impedance spectroscopy (EIS) was employed to further investigate the OER kinetics. [51,52] The electrochemical impedance spectroscopy (EIS) was employed to further investigate the OER kinetics.…”

“…Actually, we have considered different ZnCl 2 contents of the precursor solution and achieved the optimized OER activity at the ZnCl 2 content of 0.40 g (Figure S11, Supporting Information). As shown in the Tafel plots (Figure b), UfD‐RuO 2 /CC shows the lowest Tafel slope of 36.9 mV dec −1 , indicating faster OER kinetics of UfD‐RuO 2 /CC than RuO 2 /CC and commercial RuO 2 . The electrochemical impedance spectroscopy (EIS) was employed to further investigate the OER kinetics.…”

Decoupling Oxygen and Chlorine Evolution Reactions in Seawater using Iridium‐based Electrocatalysts

“…[27,28] Based on the high performance and chemical stability of Ir-based electrocatalysts for OER in acidic electrolytes, and given the literature reports of improving electrocatalytic activity of non-precious metal catalysts on carbon supports, [29,30,31,32] we chose to study the activity of pyrolyzed Irbased organometallics embedded within a high surface area carbonaceous support. [33] Prior reports on Ir-based electrocatalysts for OER have utilized IrO 2 and/or Ir alloys supported on carbon or transition metal supports, [33,34,35,36] with only one example of the pyrolysis of iridium chloride with nickel oxide. [37] Moreover, pyrolyzing organometallics onto high surface area carbon has shown to improve OER performance.…”