Effect of crystallographic structure of iridium based oxides on electrochemical degradation

Thermal‐Driven Orderly Assembly of Ir‐atomic Chains on α‐MnO2 with Enhanced Performance for Acidic Oxygen Evolution

“…The N 2 adsorption‐desorption isotherms of the synthesized electrocatalysts are depicted in Figure 3, and the Brunauer‐Emmett‐Teller (BET), pore size parameters are listed in Table S1. According to the International Union of Pure and Applied Chemistry (IUPAC) classification in Figure 3, the N 2 adsorption‐desorption isotherms of α‐MnO 2 , α‐CeMnO 2 , IrMnO@Ir, and IrMnO@Ir, were of type IV with H3‐type hysteresis loops, which were similar to those reported earlier for MnO 2 nanorods, suggesting that the synthesized materials have a slit‐like mesoporous structure [14,19] . It was witnessed from the Barrett–Joyner–Halenda (BJH) pore size distribution results illustration in Figure S1 and Table S1.…”

“…According to the International Union of Pure and Applied Chemistry (IUPAC) classification in Figure 3, the N 2 adsorptiondesorption isotherms of α-MnO 2 , α-CeMnO 2 , IrMnO@Ir, and IrMnO@Ir, were of type IV with H3-type hysteresis loops, which were similar to those reported earlier for MnO 2 nanorods, suggesting that the synthesized materials have a slit-like mesoporous structure. [14,19] It was witnessed from the Barrett-Joyner-Halenda (BJH) pore size distribution results illustration in Figure S1 and Table S1. The mesoporous nature of electrocatalysts facilitates the realization of electrolyte penetration into the internal voids of the catalyst surface by providing efficient transport pathways and also facilitates the discharge of gases generated by electrolysis, inhibiting catalyst deactivation caused by gas bubbles covering the active sites.…”

“…Therein, 1D MnO 2 has the outstanding characteristics of rich valence distribution, high acid tolerance, and high redox activity, and is considered to assist Ir active sites to improve OER activity and stability. [13] An Ir-doped tunnel manganese oxide (K 1.65 (Mn 0.78 Ir 0.22 ) 8 O 16 ) based electrocatalyst system (η � 340 mV) reported by Sun et al [14] Several studies have reported that combining CeO 2 with IrO x and treating CeO 2 as an electronic regulator of the local electronic structure of iridium species, provides a new way to improve the catalytic activity and stability of IrO x . [11,15] Inspired by this, combining the electron buffer CeO 2 with IrMnO x solid solution is a feasible strategy to stabilize the oxidation state of low iridium, which in theory can minimize or even completely inhibit the dissolution of iridium in strongly oxidizing and strongly corrosive acidic OER environments.…”

“…Therein, 1D MnO 2 has the outstanding characteristics of rich valence distribution, high acid tolerance, and high redox activity, and is considered to assist Ir active sites to improve OER activity and stability [13] . An Ir‐doped tunnel manganese oxide (K 1.65 (Mn 0.78 Ir 0.22 ) 8 O 16 ) based electrocatalyst system (η≈340 mV) reported by Sun et al [14] . Several studies have reported that combining CeO 2 with IrO x and treating CeO 2 as an electronic regulator of the local electronic structure of iridium species, provides a new way to improve the catalytic activity and stability of IrO x [11,15] .…”