Phase modification of cobalt-based structures for improvement of catalytic activities and energy storage

Allison, Cassia A.; Gupta, Anjali; Kumar, Anuj; Srivastava, Rishabh; Wang, Lin; Sultana, Jolaikha; Mishra, Sanjay R.; Pérez, Felio; Gupta, Ram K.; Dawsey, Tim

doi:10.1016/j.electacta.2023.143023

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…Such metals, however, are not readily abundant and, as a result, are high in cost, thus limiting their large‐scale application. As such, a material that can act as a catalyst for HER that is readily available and cheap to acquire and manufacture is required 7,8 …”

Section: Introductionmentioning

confidence: 99%

Ni‐Co‐based bimetal organic framework as superior electrode material for hydrogen evolution reaction and supercapacitors

Bhardwaj,

Srivastava,

Mageto

et al. 2023

Energy Storage

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Metal‐organic frameworks (MOFs) possess several desirable properties, including a homogeneous crystal structure, variable porosity, high surface area, and a notable adsorption affinity, making them highly promising contenders for deployment as electrode materials in supercapacitors (SCs) and water electrolyzers, which are acknowledged for the ever‐increasing demand for instantaneous energy. Herein, we report the rationally assembled Ni‐Co‐based bimetallic MOF compounds using a glutaric acid as an organic ligand and low‐temperature hydrothermal treatment that surmounts the electrocatalytic and electrochemical charge storage activity in an alkaline medium. The NiCo‐MOF surpassed the hydrogen evolution reaction (HER) among other as‐synthesized materials, exhibiting the least overpotential of 182 mV at 10 mA/cm2 of current density, showed splendid kinetics with a turnover frequency of 2.86 s−1, and higher stability after 1000 HER cycles in 1 M KOH. Furthermore, NiCo‐MOF impetuses were employed for SC application and displayed the highest specific capacitance of 978 F/g than Ni‐MOF (706 F/g) and Co‐MOF (91 F/g) at 1 A/g of current density. Theoretical studies exhibited that the optimal electronic coupling and synergistic effect due to Ni‐Co sites enhances the overall electronic properties of NiCo‐MOF. Therefore, enhancing its electrochemical performance concerning water‐splitting and charge storage. This study showcases a novel approach for producing ultrathin and flexible bimetallic MOF‐based electrode material to enrich the performance in electrocatalytic HER and SCs.

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Section: Introductionmentioning

confidence: 99%

Ni‐Co‐based bimetal organic framework as superior electrode material for hydrogen evolution reaction and supercapacitors

Bhardwaj,

Srivastava,

Mageto

et al. 2023

Energy Storage

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“…Within this framework, transition metal oxides [RuO 2 , MnO 2 , Co 3 O 4 , hydroxides (Ni(OH) 2 , Co(OH) 2 ), sulfides (MoS 2 , Co 9 S 8 ), and phosphides (Ni 2 P)] have been tested as electrode materials in these devices [ 9 – 15 ]. However, these materials still have limited electrochemical performance and stability in water electrolyzers and supercapacitors, which may be due to poor alteration of transition metal electronic characteristics by corresponding oxide, sulfide, and phosphide frameworks [ 15 – 20 ].…”

Section: Introductionmentioning

confidence: 99%

Optimum iron-pyrophosphate electronic coupling to improve electrochemical water splitting and charge storage

Srivastava,

Chaudhary,

Kumar

et al. 2023

Discover Nano

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Tuning the electronic properties of transition metals using pyrophosphate (P2O7) ligand moieties can be a promising approach to improving the electrochemical performance of water electrolyzers and supercapacitors, although such a material’s configuration is rarely exposed. Herein, we grow NiP2O7, CoP2O7, and FeP2O7 nanoparticles on conductive Ni-foam using a hydrothermal procedure. The results indicated that, among all the prepared samples, FeP2O7 exhibited outstanding oxygen evolution reaction and hydrogen evolution reaction with the least overpotential of 220 and 241 mV to draw a current density of 10 mA/cm2. Theoretical studies indicate that the optimal electronic coupling of the Fe site with pyrophosphate enhances the overall electronic properties of FeP2O7, thereby enhancing its electrochemical performance in water splitting. Further investigation of these materials found that NiP2O7 had the highest specific capacitance and remarkable cycle stability due to its high crystallinity as compared to FeP2O7, having a higher percentage composition of Ni on the Ni-foam, which allows more Ni to convert into its oxidation states and come back to its original oxidation state during supercapacitor testing. This work shows how to use pyrophosphate moieties to fabricate non-noble metal-based electrode materials to achieve good performance in electrocatalytic splitting water and supercapacitors.

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Bimetallic MnNi-hydroxide electrodeposited on Ni-foam for superior water-splitting and energy storage

Srivastava,

Bhardwaj,

Kumar

et al. 2024

International Journal of Hydrogen Energy

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Phase modification of cobalt-based structures for improvement of catalytic activities and energy storage

Cited by 3 publications

References 41 publications

Ni‐Co‐based bimetal organic framework as superior electrode material for hydrogen evolution reaction and supercapacitors

Ni‐Co‐based bimetal organic framework as superior electrode material for hydrogen evolution reaction and supercapacitors

Optimum iron-pyrophosphate electronic coupling to improve electrochemical water splitting and charge storage

Bimetallic MnNi-hydroxide electrodeposited on Ni-foam for superior water-splitting and energy storage

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