Unprecedented energy storage in metal–organic complexes <i>via</i> constitutional isomerism

Raja, A. Sivantha; Deebansok, Siraprapha; Deng, Jie; Mohammed, Amna; Zhu, Yachao; Bhat, Zahid Manzoor; Devendrachari, Mruthunjayachari Chattanahalli; Prabhakaran, Vinod; Kotresh, Harish Makri Nimbegondi; Fontaine, Olivier; Thotiyl, Musthafa Ottakam

doi:10.1039/d3sc01692g

Cited by 12 publications

(4 citation statements)

References 44 publications

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“…The extended aromaticity and conjugation provided by nitro (–NO 2 ) groups to the palladium complex make Pd( ii )TNPc more stable compared to parent Pc. 35,36…”

Section: Resultsmentioning

confidence: 99%

Tuning a palladium(ii) phthalocyanine embedded hybrid electrocatalyst for the hydrogen evolution reaction

Hadimane,

Aralekallu,

Sannegowda

2024

Sustainable Energy Fuels

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“…The extended aromaticity and conjugation provided by nitro (–NO 2 ) groups to the palladium complex make Pd( ii )TNPc more stable compared to parent Pc. 35,36…”

Section: Resultsmentioning

confidence: 99%

Tuning a palladium(ii) phthalocyanine embedded hybrid electrocatalyst for the hydrogen evolution reaction

Hadimane,

Aralekallu,

Sannegowda

2024

Sustainable Energy Fuels

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“…1a) to bring out the ligand assistance in electrocatalysis unambiguously. 46–48 Several characterizations were performed to validate the synthesis of the molecules. Matrix-Assisted Laser Desorption Ionisation-Time of flight (MALDI-TOF) furnished the mass of molecular ion peak at 571, 631 and 631, which corresponds to NiPc, α-TANiPc and β-TANiPc respectively, in Fig.…”

Section: Resultsmentioning

confidence: 99%

Fuel from waste: electrosynthesizing ammonia directly from agricultural digestate through ligand isomerization

Mendhe,

Mondal,

Raja Kottaichamy

et al. 2024

Green Chem.

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“…In particular, the OER activity of central metal ions generally follows the order Ni > Co > Fe > Mn, while the ORR activity shows the order Mn > Co > Fe > Ni . In addition, the functionalized atoms or groups in macrocyclic rings play a crucial role in modulating the catalytic behavior . For example, in a cobalt metal center with a variety of functional entities, the oxygen-based performance of the macrocyclic ring obeys the order N 2 O 2 > N 4 > N 2 S 2 > O 4 .…”

Section: Introductionmentioning

confidence: 99%

“…26 In addition, the functionalized atoms or groups in macrocyclic rings play a crucial role in modulating the catalytic behavior. 27 For example, in a cobalt metal center with a variety of functional entities, the oxygen-based performance of the macrocyclic ring obeys the order N 2 O 2 > N 4 > N 2 S 2 > O 4 . 28 In comparison to monomeric macrocycles, polymeric macrocycles are found to be advantageous, owing to their large surface area with multiple active sites, which enhances the catalytic performance of designed catalyst.…”

Section: Introductionmentioning

confidence: 99%

Phthalocyanine Polymer Anchored Ketjen Black Nanoparticles for Bifunctional Oxygen Electrocatalysis

Kousar,

Thimmappa,

Giddaerappa

et al. 2024

ACS Appl. Nano Mater.

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The limitations of current benchmark oxygen electrocatalysts, such as RuO 2 , IrO 2 , and Pt/C, due to their high cost, scarcity, and unifunctionality, have inspired a search for more effective oxygen catalysts to advance sustainable enegry solutions. Hence, development of cost-effective bifunctional catalysts to overcome the issues associated with benchmark catalysts is crucial. Metal−organic framework composites containing conductive carbon materials present promising solutions to these challenges. This study reports the synthesis, characterization, and application of a metal−organic framework of cobalt(II) tetra(3-hydroxy tyramine) phthalocyanine polymer, poly[Co (II) THTPc], for bifunctional oxygen electrocatalysis. The synthesis methodology is simple, cost-effective, and sustainable. To improve the catalytic performance of poly[Co (II) THTPc], an organic-hybrid composite was prepared by incorporating Ketjen black (KB) nanoparticles at an optimized ratio. The resulting poly[Co (II) THTPc]:KB (4:1, respectively) hybrid exhibited outstanding catalytic activity for OER bearing an overpotential of 359 mV on a Ni foam substrate and 371 mV on a glassy carbon electrode (GCE) substrate at 10 mA cm −2 current density in 1.0 M KOH at 5 mV s −1 scan rate. Furthermore, the same composite catalyst demonstrated an onset potential of 0.876 V vs RHE for ORR with a half-wave potential of 0.767 V vs RHE, obeying four-electrontransfer pathway in the same electrolyte and scan rate on GCE. In addition, the designed hybrid catalyst demonstrated improved catalytic properties compared to standard catalysts, including a lower Tafel slope, reduced charge-transfer resistance, and higher exchange current density for OER and ORR. The remarkable catalytic performance of the developed hybrid can be attributed to various synergistic effects, favorable π−π interactions, and increased number of electroactive sites that downshifts the D-band center of Co adsorption sites, effectively reducing the activation barrier of reaction intermediates in both the OER and ORR. Importantly, the low-cost bifunctional oxygen catalyst exhibited excellent stability and efficiency, making it a potential bifunctional oxygen electrocatalyst for large-scale integrated green energy systems.

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Unprecedented energy storage in metal–organic complexes via constitutional isomerism

Abstract: The essence of any electrochemical system is engraved in their electrical double layer (EDL), and we report its unprecedented reorganization by the structural isomerism of molecules with a direct consequence...

Cited by 12 publications

References 44 publications

Tuning a palladium(ii) phthalocyanine embedded hybrid electrocatalyst for the hydrogen evolution reaction

Tuning a palladium(ii) phthalocyanine embedded hybrid electrocatalyst for the hydrogen evolution reaction

Fuel from waste: electrosynthesizing ammonia directly from agricultural digestate through ligand isomerization

Phthalocyanine Polymer Anchored Ketjen Black Nanoparticles for Bifunctional Oxygen Electrocatalysis

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