A single atom Ir doped heterophase of a NiMoP-NiMoPxOy ultrathin layer assembled on CNTs-graphene for high-performance water splitting

Hoa, Van Hien; Prabhakaran, Sampath; Le, Kha Thuy Nhi; Kim, Do Hwan

doi:10.1039/d2ta03325a

Cited by 14 publications

(4 citation statements)

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“…18 NiMoP phases, observing a 90 mV overpotential to achieve a current density of 10 mA cm −2 for HER. 20 Shao et al loaded Ir nanoclusters onto covalent organic polymers (Ir-COP), which showed high activity for water splitting in both alkaline and acidic electrolytes. 21 These studies demonstrate that loading the small size Ir atoms and nanoclusters on the support material by forming the efficient electron interactions will be a good strategy for realizing the optimum catalytic activity of Ir.…”

Section: Introductionmentioning

confidence: 99%

“…Lei et al utilized the electrochemical deposition method to anchor Ir atoms on Ni (3‑ x ) Fe x S 2 nanosheets, which exhibit excellent OER performance in alkaline electrolyte due to the optimized interactions between Ir atoms and the sulfide substrate . Kim et al introduced Ir atoms into amorphous NiMoP x O y and crystalline NiMoP phases, observing a 90 mV overpotential to achieve a current density of 10 mA cm –2 for HER . Shao et al loaded Ir nanoclusters onto covalent organic polymers (Ir-COP), which showed high activity for water splitting in both alkaline and acidic electrolytes .…”

Section: Introductionmentioning

confidence: 99%

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Opposite Electron Transfer Induced High Valence Mo Sites for Boosting the Water Splitting Performance of Ir Atoms

Wei,

Liao,

Sun

et al. 2024

ACS Appl. Mater. Interfaces

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Developing highly efficient and low-cost bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in water splitting poses significant challenges. In this study, a novel bifunctional electrocatalyst, Ir n -CoMoPO x , was achieved via incorporating low-loading Ir single atoms and clusters with the high-valence Mo 6+ modified CoPO x nanosheets. The Ir n -CoMoPO x catalyst demonstrates remarkable low overpotentials of 222 mV and 36 mV for the OER and HER, respectively, in delivering a current density of 10 mA cm −2 . When employed as both the anode and cathode catalyst in overall water splitting, the Ir n -CoMoPO x ∥Ir n -CoMoPO x configuration exhibits a superior cell voltage of 1.53 V, outperforming the benchmark Pt/C∥IrO 2 electrolytic cell (1.60 V) for achieving the current density of 10 mA cm −2 . Benefiting from the high-valence of Mo species, the metal−support interaction of Ir n -CoMoPO x was greatly strengthened, resulting in an order of magnitude increase in the mass activity of Ir for the HER. The high valence of non-noble metals plays a crucial role in tuning the local electronic configurations and optimizing the adsorption energies of the intermediates, which synergistically improves the overall performance of Ir in water splitting. The study provides valuable insights for future research in the utilization of Ir-based bifunctional catalysts for overall water electrocatalysis applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Opposite Electron Transfer Induced High Valence Mo Sites for Boosting the Water Splitting Performance of Ir Atoms

Wei,

Liao,

Sun

et al. 2024

ACS Appl. Mater. Interfaces

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“…To evaluate this process, researchers typically use the Gibbs free energy of adsorbed hydrogen (ΔG H* ) to characterize: the closer the value of ΔG H* is to 0, the better the catalytic effect. [29][30][31] Based on this principle, a volcanic curve can be obtained. And as can be seen in Figure 3, the ΔG H* of noble metals is closest to 0, so noble metals have naturally high activity compared with non-precious metals.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Noble Metal‐Based Alloy Electrocatalysts and Their Application in Hydrogen Evolution Reaction

Cui

Jiao

Huang

et al. 2023

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Hydrogen energy is regarded as the ultimate energy source for future human society, and the preparation of hydrogen from water electrolysis is recognized as the most ideal way. One of the key factors to achieve large‐scale hydrogen production by water splitting is the availability of highly active and stable electrocatalysts. Although non‐precious metal electrocatalysts have made great strides in recent years, the best hydrogen evolution reaction (HER) electrocatalysts are still based on noble metals. Therefore, it is particularly important to improve the overall activity of the electrocatalysts while reducing the noble metals load. Alloying strategies can shoulder the burden of optimizing electrocatalysts cost and improving electrocatalysts performance. With this in mind, recent work on the application of noble metal‐based alloy electrocatalysts in the field of hydrogen production from water electrolysis is summarized. In this review, first, the mechanism of HER is described; then, the current development of synthesis methods for alloy electrocatalysts is presented; finally, an example analysis of practical application studies on alloy electrocatalysts in hydrogen production is presented. In addition, at the end of this review, the prospects, opportunities, and challenges facing noble metal‐based alloy electrocatalysts are tried to discuss.

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“…Recently, Ir has been considered to be an attractive candidate for acidic water electrolysis due to the inherent electronic structure similar to Pt and good stability. 12–14 However, the catalytic performance is difficult to meet the expectation. Therefore, many efforts have been made to construct efficient Ir-based catalysts for acidic water electrolysis, including surface modification and heteroatom doping.…”

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confidence: 99%

Phosphorus-induced activation of Ir metallene for efficient acidic overall water electrolysis

Wang¹,

Li²,

Zhang³

et al. 2023

Chem. Commun.

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A single atom Ir doped heterophase of a NiMoP-NiMoP_xO_y ultrathin layer assembled on CNTs-graphene for high-performance water splitting

Abstract: For bifunctional water splitting, the rational construction of efficient and robust catalysts with cost-effective and high-performance electrocatalysts study in industrial green H2 production. In this study, single atom Ir into...

Cited by 14 publications

References 76 publications

Opposite Electron Transfer Induced High Valence Mo Sites for Boosting the Water Splitting Performance of Ir Atoms

Opposite Electron Transfer Induced High Valence Mo Sites for Boosting the Water Splitting Performance of Ir Atoms

Design and Synthesis of Noble Metal‐Based Alloy Electrocatalysts and Their Application in Hydrogen Evolution Reaction

Phosphorus-induced activation of Ir metallene for efficient acidic overall water electrolysis

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