Influence of the flexible tetrapyridines on electrocatalytic water oxidation by cobalt complexes

Xie, Qin; Fu, Qiang; Cui, Hai-Bin; Luo, Bo-Hong; Liu, Weiqiang; Qiao, R.; Ren, Ya‐Jie; Chen, Fei; Zhang, Huaxin; Long, Jingjing

doi:10.1016/j.poly.2020.114731

Cited by 7 publications

(5 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For Co(H L ), a Faradaic efficiency of 83 ± 6% was found, which is a typical value for homogeneous Co-based catalysts (Figure S42). ,− , No visible changes in color, nor significant changes in the UV–vis spectrum were observed upon bulk electrolysis of a solution containing Co(H L ) for 5 h at a relatively high potential of 1.49 V versus NHE (Figure S44).…”

Section: Resultsmentioning

confidence: 99%

“…The application of molecular catalysts allows for ligand design, which could help stabilize Co-based WOCs. Stabilization or circumvention of high-valent Co species seems to be one of the key design principles in the development of homogeneous Co-based WOCs, as it reduces the problem of Co 2+ leaching or catalyst degradation with the formation of CoO x . ,− The utilization of redox-active ligands can circumvent the formation of unstable high-oxidation state metal intermediates by storing redox equivalents on the ligand. ,, Recently this strategy has already been effectively utilized for Ru-, Ni-, , and Cu-based − WOCs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Homogeneity of a Cobalt-Based Water Oxidation Catalyst

et al. 2022

View full text Add to dashboard Cite

The homogeneity of molecular Co-based water oxidation catalysts (WOCs) has been a subject of debate over the last 10 years as assumed various homogeneous Co-based WOCs were found to actually form CoO x under operating conditions. The homogeneity of the Co(H L ) (H L = N , N -bis(2,2′-bipyrid-6-yl)amine) system was investigated with cyclic voltammetry, electrochemical quartz crystal microbalance, and X-ray photoelectron spectroscopy. The obtained experimental results were compared with heterogeneous CoO x . Although it is shown that Co(H L ) interacts with the electrode during electrocatalysis, the formation of CoO x was not observed. Instead, a molecular deposit of Co(H L ) was found to be formed on the electrode surface. This study shows that deposition of catalytic material is not necessarily linked to the decomposition of homogeneous cobalt-based water oxidation catalysts.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Homogeneity of a Cobalt-Based Water Oxidation Catalyst

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Then the resulted O-H bond of the water ligand coordinated on the central cobalt would break, and then (Co III ) 2 Co IV ═O, (Co III ) 2 Co II -O-OH, O-O bonds would construct sequentially, resulting in the release of oxygen at last. [73][74][75][76][77][78]…”

Section: Electrochemical Water Oxidation Catalytic Studiesmentioning

confidence: 99%

Bioinspired cobalt molecular electrocatalyst for water oxidation coupled with carbon dioxide reduction

Yin

Zhang

Wang

et al. 2021

Applied Organom Chemis

View full text Add to dashboard Cite

To mimic photosynthesis in green plants, it is a crucial challenge to drive water oxidation and CO 2 reduction in one single system. In this study, we present a bioinspired trinuclear pyridinedicarboxylate cobalt complex (Et 3 NH) 2 [Co III 2 Co II (OH 2 )(pda) 5 ]ÁH 2 O (1) that is capable of homogeneously electrocatalytic water oxidation and CO 2 reduction simultaneously. The designed mix-valent cobalt complex is in a V-configuration composed of two terminal Co III ions and one central Co II ion coordinated with one water ligand, which is resemble to aqua ligation of the natural catalytic complex in oxygenevolving complex (OEC). The electrochemical results show that this trinuclear cobalt complex could electrocatalyze water oxidation under neutral condition at the potentials of 1.15 V and 2.00 V versus NHE, with the Faraday efficiency as high as about 96% and 82%, and the TOF of 2.22 and 10.20 s À1 , respectively. Meanwhile, it also displays electrocatalytic activity for the reduction of CO 2 to CO with the TOF of 0.93 s À1 . The cobalt complex has good catalytic performance for the conversion of H 2 O and CO 2 into O 2 and CO, respectively, which may be mainly due to the key role of the flexible water ligand on the central Co II ion in the catalytic process. This work represents the first multinuclear cobalt complex for mimicking bio-system to drive water oxidation coupled with carbon dioxide reduction simultaneously.

show abstract

“…8–11 Among them, many molecular catalysts exhibited good activity in the WOR, especially some cobalt complexes based on polypyridyl ligands. 12–16 For the catalysts based on metal complexes, the scaffolds of the organic ligands in the complexes are very crucial to their activity and stability. It has been found that the distal groups on the ligands affect the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%