Synergistically Interfaced Bifunctional Transition Metal Selenides for High‐Rate Hydrogen Production Via Urea Electrolysis

Desalegn, Bezawit Z.; Kim, Hern; Seo, Jeong Gil

doi:10.1002/cctc.202100969

Cited by 11 publications

(7 citation statements)

References 54 publications

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“…Recently, the urea oxidation reaction (UOR) has attracted great attention in urea-based energy conversion technologies as it allows for the simultaneous production of hydrogen and the treatment of urea-rich wastewater [ 23 , 26 , 27 , 28 , 29 , 30 ]. Theoretically, the UOR needs a significantly lower thermodynamic potential of 0.37 V while the OER requires a minimum of 1.23 V. Hence, the UOR offers advantageous energy savings and elevation of energy efficiency in hydrogen generation via electrochemical water-splitting [ 31 , 32 , 33 ]. Nevertheless, the UOR actually suffers from slow reaction kinetics due to the complex six-electron-transfer involved mechanism and the diverse adsorption/desorption of reaction intermediates [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

et al. 2022

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Developing efficient electrocatalysts for urea oxidation reaction (UOR) can be a promising alternative strategy to substitute the sluggish oxygen evolution reaction (OER), thereby producing hydrogen at a lower cell-voltage. Herein, we synthesized a binder-free thin film of ultrathin sheets of bimetallic Cu-Fe-based metal–organic frameworks (Cu/Fe-MOFs) on a nickel foam via a drop-casting route. In addition to the scalable route, the drop-casted film-electrode demonstrates the lower UOR potentials of 1.59, 1.58, 1.54, 1.51, 1.43 and 1.37 V vs. RHE to achieve the current densities of 2500, 2000, 1000, 500, 100 and 10 mA cm−2, respectively. These UOR potentials are relatively lower than that acquired by the pristine Fe-MOF-based film-electrode synthesized via a similar route. For example, at 1.59 V vs. RHE, the Cu/Fe-MOF electrode exhibits a remarkably ultra-high anodic current density of 2500 mA cm—2, while the pristine Fe-MOF electrode exhibits only 949.10 mA cm−2. It is worth noting that the Cu/Fe-MOF electrode at this potential exhibits an OER current density of only 725 mA cm—2, which is far inconsequential as compared to the UOR current densities, implying the profound impact of the bimetallic cores of the MOFs on catalyzing UOR. In addition, the Cu/Fe-MOF electrode also exhibits a long-term electrochemical robustness during UOR.

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Section: Introductionmentioning

confidence: 99%

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

et al. 2022

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“…2NH3 + CO2 ⇌ NH2OCONH4 ⇌ NH2CONH2 + H2O Equation 8Hydrogen production from urea is theoretically feasible via processes such as urea electrolysis. 74 Research has focused on ways to recover hydrogen from the precursor ammonia, but so far the cracking of ammonia remains a challenge. However, if this challenge is solved, it is unclear what value would come from delivering CO2 by way of urea.…”

Section: Methanolmentioning

confidence: 99%

Emerging concepts in carbon dioxide storage

Breunig

Rosner

Lim

et al. 2022

Preprint

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Finding means of storing and transporting captured carbon dioxide (CO2) has become increasingly important. Not all capture technologies (sources) can be co-located with sequestration options (sinks), and the development of an expansive CO2 pipeline network to connect sources and sinks requires significant time and capital. Additionally, temporary storage of CO2 in a solid or liquid state could prove useful for allowing today’s capture technologies to come online before permanent and ideally lucrative CO2 sequestration options open up. There are several methods for reversible solid-state and chemical CO2 storage, but their advantages and limitations have yet to be reviewed. This article focuses on the physical and chemical aspects of CO2 storage via liquid and solid chemical carriers and sorbents, and gives an overview of the energetics around their use, as well as prospects for their future development. Exciting opportunities for co-transporting hydrogen with CO2, for energy efficient long-distance transportation, and for coupling capture and multi-year storage could open up new options for carbon supply chains. Key findings of the analysis are the remarkable storage capacity of oxalic acid and formic acid (CO2-density of 1857 kg/m3 and 1152 kg/m3, compared with condensed liquid CO2 at 993–1096 kg/m3, respectively), the relative scalability and compatibility of carbonate salts for stationary storage with direct air capture, and the potential promise of multiple carriers for CO2 transportation. Solid sorbents do not achieve such ultra-high storage capacities, but could improve storage over compressed gas tanks on a capacity and energetics basis.

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“…Thus, UOR can achieve resource reuse while reducing the harm of urea emissions to the environment. However, the intrinsic drawbacks of UOR, such as sluggish 6e – transfer processes, multiple gas desorption steps, and complicated intermediate transfers, require high catalyst activity, which limits its large-scale application . Consequently, it is essential to investigate efficient electrocatalysts for both the HER and UOR to achieve the practical application of hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured MoSe₂/NiSe₂ Electrocatalysts with Heterojunctions for Hydrogen Evolution Coupling Urea Oxidation

Chen,

Ge,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Developing highly efficient and low-cost hydrogen evolution reaction (HER) electrocatalysts is an urgent and important task for development of green water electrolysis hydrogen production technology. In this work, the nanostructured MoSe 2 /NiSe 2 electrocatalyst with heterojunctions is constructed by a two-step hydrothermal method for HER coupling urea oxidation reaction (UOR). The presence of heterojunctions accelerates the charge transfer and enhances the conductivity of electrocatalysts; thus, the as-prepared nanostructured MoSe 2 / NiSe 2 exhibits bifunctional electrocatalytic activity. Low overpotentials of 79 and 120 mV are required to achieve 10 mA cm −2 current density for the HER and UOR, respectively. For the twoelectrode urea electrolysis containing 1 M KOH and 0.5 M urea, a voltage of only 1.47 V is required to deliver the current density of 10 mA cm −2 . Density functional theory (DFT) calculation results show that the MoSe 2 /NiSe 2 electrocatalyst can optimize the adsorption of H* and improve the HER activity because of the existence of the heterostructure. This work provides a promising potential for designing energy-saving hydrogen evolution catalysts with alternative electrode reactions.

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Synergistically Interfaced Bifunctional Transition Metal Selenides for High‐Rate Hydrogen Production Via Urea Electrolysis

Cited by 11 publications

References 54 publications

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

Emerging concepts in carbon dioxide storage

Nanostructured MoSe₂/NiSe₂ Electrocatalysts with Heterojunctions for Hydrogen Evolution Coupling Urea Oxidation

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Synergistically Interfaced Bifunctional Transition Metal Selenides for High‐Rate Hydrogen Production Via Urea Electrolysis

Cited by 11 publications

References 54 publications

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

Emerging concepts in carbon dioxide storage

Nanostructured MoSe2/NiSe2 Electrocatalysts with Heterojunctions for Hydrogen Evolution Coupling Urea Oxidation

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Product

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Nanostructured MoSe₂/NiSe₂ Electrocatalysts with Heterojunctions for Hydrogen Evolution Coupling Urea Oxidation