Chromium doping enabled improvement in alkaline seawater oxidation over cobalt carbonate hydroxide nanowire array

Abstract

The presence of chlorine species in seawater can cause severe anode corrosion, highlighting the critical need for the design of efficient and robust electrocatalysts towards oxygen evolution reaction (OER) for...

An Fe3+ induced etching and hydrolysis precipitation strategy affords an Fe–Co hydroxide nanotube array toward hybrid water electrolysis

“…The diffraction peaks at ∼30.2°, 33.5°, 34.9°, 36.2° and 39.2° for these two samples are ascribed to the Co(CO 3 ) 0.5 (OH)·0.11H 2 O phase (PDF #00-048-0083). 28,36 This result indicates that the surface deposited Fe species might be amorphous. Two other marked characteristic peaks located at ∼26° and 44° are attributed to the (002) and (101) reflections of typical sp 2 -bonded hexagonal graphite carbon that originated from CC.…”

“…19 Doping with other metal elements, constructing heterostructures, designing bimetallic or trimetallic carbonate hydroxides, and anion substitution are efficient modification strategies to improve their OER performances by electronic and morphological modulation. 22,23,27–35 However, how to realize effective dual modulation of the electronic structure and morphology of nickel or cobalt-based carbonate hydroxides to improve their OER performances by means of simple, room-temperature and eco-friendly methods still needs to be explored.…”

Recent advances of bifunctional electrocatalysts and electrolyzers for overall seawater splitting

“…By adding alkaline substances such as sodium hydroxide (NaOH) and potassium hydroxide (KOH) to seawater, the pH of the seawater is raised, thus inhibiting the oxidation reaction of Cl − and increasing the generation of oxygen. 59 The advantages of the alkali addition method are that it can improve the selectivity of electrolysis and has a low electrolytic voltage, but the disadvantages are that it requires high corrosion resistance of the materials used in electrolytic device and will increase the conductivity of seawater, resulting in an increase in the energy consumption of electrolysis, and may cause the waste of alkaline substances or the problem of seawater discharge.…”

Hierarchical CoS2@NiFe-LDH as an efficient electrocatalyst for alkaline seawater oxidation

“…6–10 Considering the abundantly demanded high-purity water as a feedstock for the practical application of water electrolysis and limited reserves of freshwater, seawater accounting for 96.5% of total water storage on the earth has become an appealing alternative to freshwater for H 2 production. 11–23 However, some barriers, including the slow reaction kinetics of the OER and the competitive chlorine evolution with the OER at the anode, still block the progress to realize the practical application of seawater electrolysis. Achieving large current densities at thermodynamic potential differences of <480 mV can avoid chlorine interference, which is thus essential for exploring highly selective and active OER electrocatalysts in alkaline seawater.…”