Iron–N-heterocyclic carbene complexes as efficient electrocatalysts for water oxidation under acidic conditions

Guo, Wen-Xiu; Shen, Zhi-Kai; Su, Yun-Fei; Li, Kang; Lin, Wang‐qiang; Chen, Guanghui; Guan, Jie; Wang, Xiaoming; Li, Zhaosheng; Yu, Zhen‐Tao; Zou, Zhigang

doi:10.1039/d2dt01474b

Cited by 3 publications

(2 citation statements)

References 52 publications

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“…Palladium–NHC metal complexes as heterogeneous electrocatalysts are rather unusual and unconventional; however, given their advantages as mentioned, it is not unexpected that these class of catalysts have eventually been found under the lens of electrochemistry. These NHC complexes so far have been mostly scrutinized in homogeneous electrochemical systems in applications such as CO 2 reduction, proton reduction, water oxidation, and so forth. − However, over the years, a handful of research articles have emerged centered on NHC complexes as heterogeneous electrocatalysts in sensing and energy conversion applications. − The preference of heterogeneous electrocatalysis over homogeneous electrocatalysis in this study is primarily focused on benchmarking with other common and conventional electrocatalysts; however, this task is more demanding and strenuous with homogeneous electrocatalysts …”

Section: Introductionmentioning

confidence: 99%

Palladium(II)–N-Heterocyclic Carbene Complex-Based Electrocatalysts for Hydrogen Evolution Reaction

et al. 2023

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The growing interest in the hydrogen economy demands for the sustainable and efficient production pathways from renewable sources. Among the arrays available, electrochemical hydrogen evolution reaction (HER) is considered as an efficient and sustainable approach for proton reduction to produce green hydrogen gas from water. The current work employs the construction of electrocatalysts developed from carbon composites of palladium(II) complexes derived from functionalized N-heterocyclic carbenes (NHCs). The developed electrocatalysts are studied for their HER performance in an acidic medium using a rotating ring disk electrode setup, displaying an overpotential as low as −449 mV versus reversible hydrogen electrode (RHE) with an onset potential of −240 mV versus RHE. The palladium complex-based carbon composites demonstrated improved charge transfer resistance (55–68 Ω) than that of palladium–NHC complexes (65–80 Ω). The confirmation of HER was investigated by hydrogen oxidation reaction enabled by the ring electrode. The developed electrocatalysts exhibit excellent stability for up to 10 h with minimal decrease in efficiency, as indicated by the post-stability linear sweep voltammogram. The post-HER analysis of the electrocatalysts indicates the structural and molecular intactness.

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Section: Introductionmentioning

confidence: 99%

Palladium(II)–N-Heterocyclic Carbene Complex-Based Electrocatalysts for Hydrogen Evolution Reaction

et al. 2023

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“…2,3 To fix the issues on the WOR, it is crucial to develop low-cost efficient catalysts. 4 Many homogeneous and heterogeneous nonprecious metal-based WOR catalysts were thereby exploited, including those derived from the first-row transition metals such as Mn, 3,5 Fe, 6,7 Ni, [8][9][10][11] Co [12][13][14][15] , and Cu. [16][17][18] It was demonstrated that the nanostructures of some first-row transition metal compounds supported on carbon materials were very effective heterogeneous catalysts Si-Yang Zhao and Xue-Ling Zhu contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

Catalytic water oxidation mediated by copper‐triazolylpyridine complexes

Zhao

Zhu

Wang

et al. 2023

Applied Organom Chemis

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Water oxidation reaction (WOR) is a rather sluggish process in the water splitting that hampers the extraction of hydrogen gas from water in a large scale. It is highly desirable to develop low‐cost WOR catalysts to increase the efficacy. Herein two Cu(II) complexes [Cu (DTEL)2]n(ClO4)2n (1) and [Cu(DTE)2(ClO4)2] (2) of two triazolylpyridines, 1‐(2‐hydroxy)‐4‐(2‐pyridyl)1,2,3‐triazole (DTEL) and 1‐(2‐acetoxymethyl)‐4‐(2‐pyridyl)1,2,3‐triazole (DTE), have been synthesized and characterized. The X‐ray diffraction analysis revealed that the copper centers of 1 and 2 adopted the octahedral coordination geometry with four N atoms from two DTEL or DTE ligands in the equatorial plane. The two axial sites were weakly ligated by the hydroxyl group of DTEL or perchlorate. Both complexes 1 and 2 were homogenous molecular catalysts boosting the WOR in pH 9.0 phosphate buffer solution with the overpotentials being 568 and 478 mV, rate constants (kcat) of 0.1 and 0.39 s−1, and Faradaic efficiencies of 90% and 93%, respectively. The pendant substituent on the two triazolylpyridine ligands DTEL and DTE apparently influenced the catalysis. A mechanism for the catalytic WOR mediated by 1 and 2 was suggested on the basis of the experimental data. This work illustrated that triazolylpyridines were promising scaffolds for forming metal complexes working as WOR catalysts.

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Recent advances in the catalytic applications of NHC-early abundant metals (Mn, Co, Fe) complexes

Cerquera-Montealegre,

Gallego,

Baquero

2024

Advances in Organometallic Chemistry

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Iron–N-heterocyclic carbene complexes as efficient electrocatalysts for water oxidation under acidic conditions

Abstract: The development of stable, earth-abundant, and high-activity molecular water oxidation catalysts in acidic and neutral conditions remains a great challenge. Here, the use of N-heterocyclic carbene (NHC)-based iron(III) complex 1...

Cited by 3 publications

References 52 publications

Palladium(II)–N-Heterocyclic Carbene Complex-Based Electrocatalysts for Hydrogen Evolution Reaction

Palladium(II)–N-Heterocyclic Carbene Complex-Based Electrocatalysts for Hydrogen Evolution Reaction

Catalytic water oxidation mediated by copper‐triazolylpyridine complexes

Recent advances in the catalytic applications of NHC-early abundant metals (Mn, Co, Fe) complexes

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