Atomic Heterointerface Engineering of Nickel Selenide Confined Nickel Molybdenum Nitride for High‐Performance Solar‐Driven Water Splitting

Wang, Jingqiang; Tran, Duy Thanh; Chang, Kai; Prabhakaran, Sampath; Kim, Do Hwan; Kim, Nam Hoon; Lee, Joong Hee

doi:10.1002/eem2.12526

Cited by 16 publications

(10 citation statements)

References 72 publications

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“…In the structure of the NiMoO 4 , the Mo and Ni occupy the tetrahedral position (MoO 4 ) and octahedral position (NiO 6 ), respectively (Figure S6b). Such a structure determines that Mo is more stable than Ni in the NiMoO 4 . Therefore, during the pyrolysis step, Ni atoms were diffused outward and formed nanoparticles on the surface, while Mo atoms reacted with the C 2 H 2 in their original positions to form Mo 2 C. The formed Ni/Mo 2 C@C heterostructure was confirmed by XRD.…”

Section: Resultsmentioning

confidence: 83%

Nickel Nanoparticles Protruding from Molybdenum Carbide Micropillars with Carbon Layer-Protected Biphasic 0D/1D Heterostructures for Efficient Water Splitting

Wang,

Su,

et al. 2024

ACS Appl. Mater. Interfaces

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It remains a tremendous challenge to achieve highefficiency bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) for hydrogen production by water splitting. Herein, a novel hybrid of 0D nickel nanoparticles dispersed on the one-dimensional (1D) molybdenum carbide micropillars embedded in the carbon layers (Ni/Mo 2 C@C) was successfully prepared on nickel foam by a facile pyrolysis strategy. During the synthesis process, the nickel nanoparticles and molybdenum carbide were simultaneously generated under H 2 and C 2 H 2 mixed atmospheres and conformally encapsulated in the carbon layers. Benefiting from the distinctive 0D/1D heterostructure and the synergistic effect of the biphasic Mo 2 C and Ni together with the protective effect of the carbon layer, the reduced activation energy barriers and fast catalytic reaction kinetics can be achieved, resulting in a small overpotential of 96 mV for the HER and 266 mV for the OER at the current density of 10 mA cm −2 together with excellent durability in 1.0 M KOH electrolyte. In addition, using the developed Ni/Mo 2 C@C as both the cathode and anode, the constructed electrolyzer exhibits a small voltage of 1.55 V for the overall water splitting. The novel designed Ni/Mo 2 C@C may give inspiration for the development of efficient bifunctional catalysts with low-cost transition metal elements for water splitting.

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Section: Resultsmentioning

confidence: 83%

Nickel Nanoparticles Protruding from Molybdenum Carbide Micropillars with Carbon Layer-Protected Biphasic 0D/1D Heterostructures for Efficient Water Splitting

Wang,

Su,

et al. 2024

ACS Appl. Mater. Interfaces

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“…Moreover, lattice distortions and vacancy defects caused by heteroatom doping can also lead to structural self-reorganization or phase transition of the catalyst in the process of electrocatalysis. 84 Heteroatom doping is a viable strategy for inducing phase transition in the crystalline structures of polycrystalline IGTMSes with highly symmetric structures. 50 Below the critical temperature, numerous phase transitions occur through nucleation and growth processes.…”

Section: Discussionmentioning

confidence: 99%

Phase engineering of iron group transition metal selenides for water splitting

Cao

Shen

Men

et al. 2023

Mater. Chem. Front.

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“…The adsorption energy ΔG H* of NiSe 2 /NiMoN was expected to be the lowest. However, in reality, it turned out to be the highest and was close to 0 [ 37 ].…”

Section: Mechanismsmentioning

confidence: 99%

Nano-Scale Engineering of Heterojunction for Alkaline Water Electrolysis

Chen,

Xu,

Chen

2023

Materials

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Alkaline water electrolysis is promising for low-cost and scalable hydrogen production. Renewable energy-driven alkaline water electrolysis requires highly effective electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). However, the most active electrocatalysts show orders of magnitude lower performance in alkaline electrolytes than that in acidic ones. To improve such catalysts, heterojunction engineering has been exploited as the most efficient strategy to overcome the activity limitations of the single component in the catalyst. In this review, the basic knowledge of alkaline water electrolysis and the catalytic mechanisms of heterojunctions are introduced. In the HER mechanisms, the ensemble effect emphasizes the multi-sites of different components to accelerate the various intermedium reactions, while the electronic effect refers to the d-band center theory associated with the adsorption and desorption energies of the intermediate products and catalyst. For the OER with multi-electron transfer, a scaling relation was established: the free energy difference between HOO* and HO* is 3.2 eV, which can be overcome by electrocatalysts with heterojunctions. The development of electrocatalysts with heterojunctions are summarized. Typically, Ni(OH)2/Pt, Ni/NiN3 and MoP/MoS2 are HER electrocatalysts, while Ir/Co(OH)2, NiFe(OH)x/FeS and Co9S8/Ni3S2 are OER ones. Last but not the least, the trend of future research is discussed, from an industry perspective, in terms of decreasing the number of noble metals, achieving more stable heterojunctions for longer service, adopting new craft technologies such as 3D printing and exploring revolutionary alternate alkaline water electrolysis.

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Atomic Heterointerface Engineering of Nickel Selenide Confined Nickel Molybdenum Nitride for High‐Performance Solar‐Driven Water Splitting

Cited by 16 publications

References 72 publications

Nickel Nanoparticles Protruding from Molybdenum Carbide Micropillars with Carbon Layer-Protected Biphasic 0D/1D Heterostructures for Efficient Water Splitting

Nickel Nanoparticles Protruding from Molybdenum Carbide Micropillars with Carbon Layer-Protected Biphasic 0D/1D Heterostructures for Efficient Water Splitting

Phase engineering of iron group transition metal selenides for water splitting

Nano-Scale Engineering of Heterojunction for Alkaline Water Electrolysis

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