Single-Atomic Ir and Mo Co-Confined in a Co Layered Hydroxide Nanobox Mutually Boost Oxygen Evolution

Abstract

The sluggish four-electron-transfer kinetics of the oxygen evolution reaction (OER) is a great challenge for the development of efficient and cost-effective OER electrocatalysts. Herein, we report single-atomic Ir and Mo co-confined in the lattice of a Co layered hydroxide (Co-LH) nanobox as an efficient OER electrocatalyst via a sacrificial template method. With the hollow structure and synergetic electronic interactions among Ir, Mo, and Co-LH, the catalyst delivers an ultralow overpotential of 220 mV at 10 mA cm–2 and high durability of over 800 h at 50 mA cm–2 in 1 M KOH, which significantly outperform the commercial Ir black catalyst. Density functional theory calculations indicate that adjacent Mo and Ir enhance the OER activities on the Ir sites at defects (defect-Ir) and Mo sites in the plane (in-plane-Mo), respectively. This study provides not only a highly efficient OER catalyst but also a strategy for confining dual-active centers with mutually improved catalytic activities.

An organic–inorganic hybrid polyoxoniobate decorated by a Co(iii)-amine complex for electrocatalytic urea splitting

“…36,37 The presence of Co 3+ can generate more reactive intermediates (CoOOH) as effective active sites in the catalytic process, resulting in better OH ion capture and faster reaction kinetics. 37,38 The peaks of Nb 3d 5/2 and Nb 3d 3/2 are assigned to the Nb 3d spectrum of Co 2 Nb 6 at 203.2 and 205.9 eV, respectively (Fig. 2c).…”

Ruthenium‐Induced Activation of Molybdenum‐Cobalt Phosphide for High‐Efficiency Water Splitting

“…This result is consistent with previous reports which may result from the hydrolysis of Na 2 MoO 4 solution. [ 31 ] Finally, after phosphorylation, the hollow hydroxide cubes converted into the corresponding phosphide. Figure 1b shows that Ru‐MoCoP maintained the cubic morphology with many nanosheets stacked on the surface, which inherited the properties of the hydroxide precursor well.…”

Engineering high-valence metal-enriched cobalt oxyhydroxide catalysts for an enhanced OER under near-neutral pH conditions

“…The 2θ peaks at 11.6°, 23.2°, 33.5°, 34.5°, and 60°correspond to the (003), (006), (012), (100), and (110) planes of cobalt hydroxides (JCPDS no. 46-0605) 32. There was no striking distinction in the crystal structure with the introduction of different high valence metals, which demonstrates the preservation of the α-Co(OH) 2 structure.Fig.…”