Homogeneous electrocatalytic water oxidation catalyzed by a mononuclear nickel complex

Lin, Junqi; Kang, Peng; Liang, Xiangming; Ma, Baochun; Ding, Yong

doi:10.1016/j.electacta.2017.11.061

Cited by 71 publications

(58 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Synthesis, structure and redox properties of 1 2--3 2-We have prepared and characterized complexes 1 2-, 2 2and 3 2in Figure 1A following similar procedures described in the literature (See SI). 23,25 As already reported for 1 2-, complexes 2 2and 3 2-with Me and MeO substitution at the aromatic ring respectively, also feature a pseudo square-planar geometry typical of a low spin d 8 Ni(II) complex as shown in their crystal structure presented in Figure 1B. The Ni-N distances range from 1.852 to 1.918 Å and are slightly shorter than those of the analogous copper complexes, 25 reflecting the strength and stability of the Nickel-amidate bonds.…”

Section: Resultsmentioning

confidence: 99%

“…[18][19][20][21] True homogeneous catalysis based on Ni complexes are rare and thus is a relatively unexplored field. [22][23][24] In order to decipher the narrow line between homogeneous and heterogeneous catalysis using molecular Ni complexes, we have chosen the recently reported [(L 1 )Ni II ] 2-(L 1 = ophenylenebis(oxamidate)) complex, 1 2-, 19 and its aryl substituted analogues [(L 2 )Ni II ] 2-(L 2 = 4,5-dimethyl-1,2-phenylenebis(oxamidate)), 2 2-, and [(L 3 )Ni II ] 2-(L 2 = 4-methoxy-1,2phenylenebis(oxamidate)), 3 2reported here for the first time (See Figure 1 for a drawn structure and crystal structure). We study in depth the catalytic pathways available to this family of complexes together with the deactivation paths that can lead to the formation of NiOx.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Can Ni Complexes Behave as Molecular Water Oxidation Catalysts?

et al. 2019

View full text Add to dashboard Cite

The present report uncovers the borderline between homogeneous and heterogeneous water oxidation catalysis using a family of Ni complexes containing oxamidate anionic type of ligands. In particular, the Ni complex [(L 1)Ni II ] 2-(1 2-; L 1 = o-phenylenebis(oxamidate)) and its modified analogues [(L 2)Ni II ] 2-(2 2-;L 2 = 4,5-dimethyl-1,2-phenylenebis(oxamidate)) and [(L 3)Ni II ] 2-(3 2-;L 2 = 4methoxy-1,2-phenylenebis(oxamidate)) have been prepared and evaluated as molecular water oxidation catalysts at basic pH. Their redox features have been analyzed by mean of electrochemical measurements revealing a crucial involvement of the ligand in the electron transfer processes. Moreover, the stability of those complexes has been assessed both in solution and immobilized on graphene-based electrodes at different potentials and pHs. The degradation of the molecular species generates a NiOx layer, whose stability and activity as water oxidation catalyst has also been stablished. Electrochemical methods, together with surface characterization techniques, have shown the complex mechanistic scenario in water oxidation catalyzed by this family of Ni complexes, which consists of the coexistence of two catalytic mechanism: a homogeneous pathway driven by the molecular complex and a heterogeneous pathway based on NiOx. The electronic perturbations exerted through the ligand framework has manifested a strong influence over the stability of the molecular species under turnover conditions. Finally, 1 2has been used as a molecular precursor for the formation of NiFeOx anodes that behave as extremely powerful water oxidation anodes.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Can Ni Complexes Behave as Molecular Water Oxidation Catalysts?

et al. 2019

View full text Add to dashboard Cite

show abstract

“…, and 2-((bis(pyridin-2ylmethyl)amino)methyl)phenol, have been synthesized and used to assess the performance of catalytic water oxidation. 254,[257][258][259] Some other Ni-based complexes were reported as precursors to generate active Ni oxide films for water oxidation. [260][261][262] Because of the fewer redox states of Ni ions, development of Ni-based WOCs with low overpotentials remains challenging.…”

Section: Overview Of Molecular Water-oxidation Catalysts (Wocs)mentioning

confidence: 99%

Artificial photosynthesis: opportunities and challenges of molecular catalysts

2019

View full text Add to dashboard Cite

show abstract

“…There are two categories of WOC: homogeneous catalysts and heterogeneous catalysts. Owing to the advantage of chemical modification and mechanistic understanding, systematical improvement of catalytic ability of homogeneous WOC is relatively easy in comparison to heterogeneous WOC ,. Heterogeneous catalyst are reusable since they can be easily separated from reaction system.…”

Section: Introductionmentioning

confidence: 99%

Catalysts Based on Earth‐Abundant Metals for Visible Light‐Driven Water Oxidation Reaction

Lin

Han

Ding

2018

The Chemical Record

Self Cite

View full text Add to dashboard Cite

Exploration of water oxidation catalyst (WOC) with excellent performance is the key for the overall water splitting reaction, which is a feasible strategy to convert solar energy to chemical energy. Although some compounds composed of noble metals, mainly Ru and Ir, have been reported to catalyze water oxidation with high efficiency, catalysts based on low-cost and earth-abundant transition metals are essential for realizing economical and large-scale light-driven water splitting. Various WOCs containing earth-abundant metals (mainly Mn, Fe, Co, Ni, Cu) have been utilized for visible light-driven water oxidation in recent years. In this Personal Account, we summarize our recent developments in WOCs based on earth-abundant transition metals including polyoxometalates (POMs), metal oxides or bimetal oxides, and metal complexes containing multidentate ligand scaffolds for visible light-driven water oxidation reaction.

show abstract

Homogeneous electrocatalytic water oxidation catalyzed by a mononuclear nickel complex

Cited by 71 publications

References 46 publications

Can Ni Complexes Behave as Molecular Water Oxidation Catalysts?

Can Ni Complexes Behave as Molecular Water Oxidation Catalysts?

Artificial photosynthesis: opportunities and challenges of molecular catalysts

Catalysts Based on Earth‐Abundant Metals for Visible Light‐Driven Water Oxidation Reaction

Contact Info

Product

Resources

About