High-performance seawater oxidation by a homogeneous multimetallic layered double hydroxide electrocatalyst

Abstract

Significance Seawater is one of the most abundant resources on Earth. Direct electrolysis of seawater is a transformative technology for sustainable hydrogen production without causing freshwater scarcity. However, this technology is severely impeded by a lack of robust and active oxygen evolution reaction (OER) electrocatalysts. Here, we report a highly efficient OER electrocatalyst composed of multimetallic layered double hydroxides, which affords superior catalytic performance and long-term durability for high-performance seawater electrolysis. To the best of our knowledge, this catalyst is among the most active for OER and it advances the development of seawater electrolysis technology.

A two-dimensional heterogeneous structured Ni3Se2@MoO3 catalyst for seawater electrolysis

“…This indicates that the high concentration of Cl ions has little effect on the catalytic activity and that the catalyst achieves high OER selectivity. 34 The Tafel value for Ni 3 Se 2 @-MoO 3 /CF was 74.7 mV dec −1 , which was lower than those for the benchmark RuO 2 catalyst (118.6 mV dec −1 ), Ni 3 Se 2 /CF (91.4 mV dec −1 ), and MoO 3 /CF (110.9 mV dec −1 ) (Fig. 3b).…”

“…3h). 34 The HER activities of the catalysts were also measured by LSV scans at 5 mV s −1 in 1.0 M KOH + seawater (Fig. 4a).…”

Recent Progress in Design Strategy of Anode for Seawater Electrolysis

“…The first two methods have the advantage of high measurement accuracy but complex equipment requirements while the last one is convenient but has low accuracy. [73,74] The FE of O 2 can be calculated using the theoretical gas concentrations (C gastheor ) which can be obtained based on Faraday law and the ideal gas equation and the nominal measured gas concentrations (C gasnominal ) as follows: FE (%) = C gasnominal /C gastheor * 100. [75] The FE can also be obtained by rotating ring-disk electrode (RRDE) test, under specific potentials (e.g., 0.5 V vs SHE), the Pt ring electrode is only sensitive to the reduction of ClO À back to Cl À (not sensitive to oxygen reduction reaction), while OER and possible COR occurs at the disk electrode.…”

Interfacial Electron Regulation and Composition Evolution of NiFe/MoC Heteronanowire Arrays for Highly Stable Alkaline Seawater Oxidation

“…To date, some non-precious OER catalysts for alkaline seawater electrolysis, including NiCo alloy nanoparticles decorated on N-doped carbon (NC) nanofibers, core-shell-structured CoP x @FeOOH, vanadium-incorporated CoP 2 , spherical Ni 3 S 2 /Fe-NiP x magic cube, Ni 3 S 2 /Co 3 S 4 heterojunction nanosheets and porous S-doped Ni/Fe (oxy)hydroxide, have developed. [17,[21][22][23][24][25][26][27][28] These catalysts could drive large current densities at low overpotentials in alkaline seawater or simulated seawater. For example, in alkaline seawater, the Ni 3 S 2 /Co 3 S 4 catalyst requires an overpotential of 360 mV to drive a current density of 100 mA cm À 2 .…”