Non‐Noble Metal Ion‐Based Metal‐Organic Framework Electrocatalyst for Electrochemical Hydrogen Generation

Prakash, Satya; Tanwar, Deepika; Raizda, Pankaj; Singh, Pardeep; Mudgal, Manish; Srivastava, Avanish Kumar; Singh, Archana

doi:10.1002/9781119776086.ch5

Cited by 1 publication

(2 citation statements)

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“…Currently, the global population is around 7.9 billion, growing annually by 1.05%. This has led to a 5.8% increase in primary energy consumption in 2021. , Unfortunately, a significant portion of the world’s energy demand is met through the burning of nonrenewable fossil fuels like coal and petroleum. Since fossil fuels are finite resources and cause pollution, there is an urgent need to transition to renewable energy sources with minimal carbon emissions. − While nature has provided abundant energy resources such as wind and solar power, their limitations including availability, costs, and specificity hinder their full utilization.…”

Section: Introductionmentioning

confidence: 99%

“…It offers advantages over traditional energy storage systems such as fuel cells or lithium-ion batteries due to its high energy density, burning efficiency, nontoxicity, and renewable nature. Hydrogen is considered one of the cleanest energy carrier for the future. ,− Water splitting is a highly promising method for producing hydrogen, particularly through direct water splitting using electrocatalysts at room temperature. Water splitting involves two half-cell reactions: the hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the anode.…”

Section: Introductionmentioning

confidence: 99%

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Graphene Supported Pillared Ni–Co Metal–Organic Framework as an Efficient Electrocatalyst for the Water Oxidation Reaction

Prakash,

Kamlesh,

Tavar

et al. 2023

ACS Appl. Energy Mater.

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The oxygen evolution reaction (OER) plays a critical role in the overall efficiency of water electrolysis. To address the ongoing challenge of creating electrocatalysts with high current density, low overpotential, and durable performance, we present a potential electrocatalyst for water oxidation in an alkaline medium in the form of a composite of pillared metal−organic framework (MOF) and graphene (G), designated as Ni 2 Co(bdc) 2 D@G. The bimetallic MOF was synthesized via a solvothermal approach, using nickel and cobalt metal ions that coordinate with 1,4-benzenedicarboxylic acid (bdc) and 1,4diazobicyclo[2.2.2]-octane (DABCO, D) as a pillared ligand. The assynthesized MOF was then combined with graphene to form the composite. Our electrochemical analysis revealed that the Ni 2 Co-(bdc) 2 D@G composite exhibits superior catalytic activity to that of Ni 2 Co(bdc) 2 D, with an overpotential of 350 mV at 10 mA cm −2 and a Tafel slope of 42.7 mV dec −1 , as opposed to 420 mV at 10 mA cm −2 and a Tafel slope of 84.4 mV dec −1 for Ni 2 Co(bdc) 2 D. Furthermore, the MOF@G composite required only 400 mV to achieve a current density of 50 mA cm −2 . This significant improvement in performance is attributed to the synergistic effects between the MOF and graphene, resulting in enhanced current density and reduced overpotential. The high electrocatalytic performance of the composite was attributed to the strong π−π interaction between the MOF and G, as well as the high surface area of the composite. Additionally, during the OER, the composite facilitated the formation of Ni(OH) 2 /NiOOH and Co(OH) 2 / CoOOH species, which further contributed to the overall efficiency of the electrocatalyst.

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