An Extraordinary OER Electrocatalyst Based on the Co−Mo Synergistic 2D Pure Inorganic Porous Framework

Abstract

In this paper, three Compounds have been synthesized via conventional solution method. Compound 1 is a pure 2D (two dimensional) inorganic {CoO 6 Mo 8 O 28 } n framework. In the structure, the rare {γ-Mo 8 O 28 } units connect into 1D chains via vertex-sharing mode, and further assemble into 2D frameworks by {CoO 6 } octahedral linkers. This Compound was proved to be a costeffective pre-catalyst with excellent catalytic performances due to presence of cobalt for water oxidation with low overpotential of 293 mV at 10.0 mA cm À 2 and small Tafel slope of 53 mV dec À 1 . Furthermore, the electrocatalytic activity can be maintained for a quite long time with the retention rate of 94 % within 24 hours. Compared with 1D {γ-Mo 8 O 26 } n (Compound 2) and 0D {α-Mo 8 O 26 } (Compound 3), the CoÀ Mo complex catalyst based on compound 1, featured with Co-doped 2D {Mo 8 O 28 } n porous framework and CoÀ Mo synergistic effect, which is supported by the high resolution XPS of Co 2p and Mo 3d, exhibits an extraordinary electrocatalytic reaction for water oxidation. The work shown here enriches inorganic polyoxometalate (POM) -based functional material applied to relief energy crisis.

Recent research progress on polyoxometalate-based electrocatalysts in energy generation

“…In parallel research, Zeng et al compared the OER capabilities of conventional POMs with transition metal-incorporated derivatives. 114 Three functional framework compounds, {CoO 6 Mo 8 O 28 } n ( 1 ), {γ-Mo 8 O 26 } n ( 2 ) and {α-Mo 8 O 26 } ( 3 ), were synthesized using the conventional solution method. Compound 1 possessed a pure 2D inorganic {CoO 6 Mo 8 O 28 } n framework, compound 2 had a 1D structure, and compound 3 exhibited a 0D structure.…”

Polyoxometalate-based frameworks as chemical nanoreactors: in situ synthesis of active silver nanoparticles in confined spaces

“…9 The ligand shell can endow MNPs with unique physicochemical properties. Polyoxometalates (POMs) that possess redox activity, acidity, and composition diversity currently have been undergoing a remarkable development because of their broad application prospects in fluorescence, 10 catalysis, [11][12][13][14][15][16] medicine, [17][18][19][20] stimulus-response, 21 magnetism, 22 and energy storage. [23][24][25][26][27] They can be regarded as bulk inorganic ligands, reducing agents, and capping agents for the preparation of MNPs.…”

Chiral polyoxometalate–cyclodextrin frameworks via Mn-mediated assembly: Enhanced stability and catalytic activity

“…MOFs featuring large specific surface areas and permanent pores have become outstanding candidates for loading POMs. The application of POMs as building blocks to construct POM-based open frameworks has many advantages, such as robustness, intrinsic porosity, and easy recycling [14][15][16][17][18][19][20].…”