CoO-modified Co₄N as a heterostructured electrocatalyst for highly efficient overall water splitting in neutral media

Abstract

A CoO-domain-coated porous Co4N array was integrated for bifunctional catalysis of overall water splitting with a low voltage of 1.79 V in neutral media.

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

“…The heterostructure of CoO‐domain‐anchored Co 4 N nanowhiskers demonstrates as an effective bifunctional electrocatalyst for both OER and HER in neutral media. The periodically‐aligned (111) crystalline planes between Co 4 N and CoO provides good electron transport through their interface, the porous metallic Co 4 N nanowhiskers integrated on a nickel foam contributes an arterial channel for collecting current as well as a spacious surface area for increasing the reaction cross section for heterocatalysis . Co 3 O 4 quantum dots (QDs) as a highly efficient and stable OER catalyst at neutral pH has been reported, which were synthesized by reacting cobalt acetate with benzyl alcohol in the presence of ammonia under reflux conditions.…”

“…The heterostructure performs dual functions of elevating activity and diminishing interior resistance of the catalyst. Moreover, the porous metallic Co 4 N nanowhiskers integrates on a nickel foam, and this configuration contributes an arterial channel for collecting current as well as a spacious surface area for increasing the reaction cross section for heterocatalysis . Therefore, efficient structural identifications and fabrication of the heterostructure can provide possible reasons or root of the excellent performance.…”

Trace Iridium Engineering on Nickel Hydroxide Nanosheets as High‐active Catalyst for Overall Water Splitting

“…As shown in Figure S16b, the Ir 3 −Ni(OH) 2 /NF∥Ir 3 −Ni(OH) 2 /NF couple delivers the current densities of 10 and 50 mA ⋅ cm −2 at the potentials of 1.54 and 1.76 V in 1 M KOH solution, respectively. Moreover, Ir 3 −Ni(OH) 2 /NF∥Ir 3 −Ni(OH) 2 /NF couple requires a low potential of 1.64 V to afford 10 mA ⋅ cm −2 in 1 M PBS (Figure 4e), which is obviously lower than a string of recently reported neutral‐pH electrocatalysts (Figure 4f) [34–44] . Moreover, Ir 3 −Ni(OH) 2 /NF∥Ir 3 −Ni(OH) 2 /NF shows good stability for water electrolysis under alkaline condition and neutral‐pH water (Figure S14, S15).…”

“…Moreover, Ir 3 À Ni(OH) 2 /NF k Ir 3 À Ni(OH) 2 /NF couple requires a low potential of 1.64 V to afford 10 mA • cm À 2 in 1 M PBS (Figure 4e), which is obviously lower than a string of recently reported neutral-pH electrocatalysts (Figure 4f). [34][35][36][37][38][39][40][41][42][43][44] Moreover, Ir 3 À Ni(OH) 2 /NF k Ir 3 À Ni(OH) 2 /NF shows good stability for water electrolysis under alkaline condition and neutral-pH water ( Figure S14, S15).…”

Hatted 1T/2H‐Phase MoS2 on Ni3S2 Nanorods for Efficient Overall Water Splitting in Alkaline Media

“…[1][2][3][4][5] Innumerable publications have evidenced that the electrocatalytich ydrogen evolution reaction (HER) is an efficient and sustainable way to produce clean energy through water splitting. [11][12][13][14] Thus, electrocatalysts are indispensablet or educe the overpotential required for water splitting. [11][12][13][14] Thus, electrocatalysts are indispensablet or educe the overpotential required for water splitting.…”