Ni-based heterogeneous catalyst from a designed molecular precursor for the efficient electrochemical water oxidation

Abstract

Bimetallic Ni-Mo alkoxide was synthesized and exploited as the single-source precursor for the solution-processed deposition of the mixed-oxide layers on different conducting surfaces. Upon potential cycling in 1 M NaOH, these composites convert, in situ, into highly porous NiOx/NiOOH catalysts characterized by the high electrocatalytic activity for water oxidation under both basic (pH 13.6) and near neutral (pH 9.2) conditions.

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

“…This strongly indicate that nanohybrids of Ni‐based catalysts and carbon a facile path for the development of highly active electrocatalysts . By using the bimetallic Ni–Mo alkoxide as the single‐source precursor and potential cycling in 1.0 m NaOH, the derived highly porous NiO x /NiOOH mixed‐oxide layers can be utilized for water oxidation in both basic (pH 13.6) and near‐neutral (pH 9.2) conditions . Designing of metallic with 1D/1D hierarchical nanostructures can boost the OER.…”

Cobalt Oxide Materials for Oxygen Evolution Catalysis via Single‐Source Precursor Chemistry

“…[7][8][9][10][11] Following this argument, as ynthetic protocolc ouldb ed evised that includes the preparation of am ultimetallic materialf rom which certain constituentsa re then removed to leave ap orous, high-surfacearea structure. [12,13] Heterometallic alkoxides seem to be an excellent optiont oa ccomplish this goal, as they readily decompose upon hydrolytic or thermalt reatment to produce homogeneous heterometallic oxidefilms with elementratios precise-ly defined by the precursor stoichiometry.M oreover,t he potential for tuning the metal combinationsi sr estricted only by the inherentt hermodynamic instability of particular metalÀ oxygen bonds, which makes the approachb ased on alkoxide precursors au niversal means for the productiono fo xide coatings, [14][15][16] particularly for energy applications. [13,[17][18][19][20][21][22] Another factor contributing to the efficiency of the electrolysis cell is the electrolyte species, which, apart from having a bufferingr ole, can affect the catalystp erformance throught he structural tuning of the latter by the inclusion of cations or anions into the catalyst structure or by ac ation/anion effect on the interfacial water structure.…”

“…An increase in the specific surface area could be achieved, for instance, by leaching or electrochemical dissolution of some of the bulk constituents . Following this argument, a synthetic protocol could be devised that includes the preparation of a multimetallic material from which certain constituents are then removed to leave a porous, high‐surface‐area structure . Heterometallic alkoxides seem to be an excellent option to accomplish this goal, as they readily decompose upon hydrolytic or thermal treatment to produce homogeneous heterometallic oxide films with element ratios precisely defined by the precursor stoichiometry.…”

“…Heterometallic alkoxides seem to be an excellent option to accomplish this goal, as they readily decompose upon hydrolytic or thermal treatment to produce homogeneous heterometallic oxide films with element ratios precisely defined by the precursor stoichiometry. Moreover, the potential for tuning the metal combinations is restricted only by the inherent thermodynamic instability of particular metal−oxygen bonds, which makes the approach based on alkoxide precursors a universal means for the production of oxide coatings, particularly for energy applications …”

“…Interest in molybdenum as ad opant in cobalt-and nickelbased materials for water oxidation catalysis has arisen as a result of an umber of reports describing the high activity of catalysts containingm olybdenum as ac ounterpartt on ickel, cobalt,a nd iron. [13,[29][30][31][32][33] This urged us to investigate compounds comprising these non-noblem etals [13] in combination with molybdenum to produce materials with high electrocatalytic activity towards water oxidation.…”