Large current density for oxygen evolution from pyramidally-coordinated Co oxide

Hu, Yitian; Li, Lili; Zhao, Jianfa; Huang, Yu‐Cheng; Kuo, Chang‐Yang; Zhou, Jing; Fan, Yalei; Lin, Hong‐Ji; Dong, Chung‐Li; Pao, Chih‐Wen; Lee, Jyh‐Fu; Chen, Chien‐Te; Jin, Changqing; Hu, Z.; Wang, Jianqiang; Zhang, Linjuan

doi:10.1016/j.apcatb.2023.122785

Cited by 17 publications

(6 citation statements)

References 64 publications

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“…Similarly, the XPS results in Figure S20 reveal the presence of peaks for Ni, Mo, Fe, and O, but the peak intensity of Mo is further decreased possibly caused by constant oxidation and dissolution into the alkaline electrolyte during the chronopotentiometry test. On the strength of two typical indicators of catalytic activity and stability of the electrocatalysts, the lowest overpotential and longest durability at large current density of 1000 mA cm –2 for the Mo-NiO@NiFe LDH can be observed in Figure S14d and Table S4, in comparison with most previously reported state-of-the-art OER catalysts, ,− showing great potential for industrial application.…”

Section: Resultsmentioning

confidence: 81%

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Ye,

Yuan,

Peng

et al. 2024

ACS Appl. Mater. Interfaces

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Heterostructure catalysts are considered as promising candidates for promoting the oxygen evolution reaction (OER) process due to their strong electron coupling. However, the inevitable dissolution and detachment of the heterostructure catalysts are caused by the severe reconstruction, dramatically limiting their industrial application. Herein, the NiFe-layered double hydroxide (LDH) nanosheets attached on Mo-NiO microrods (Mo-NiO@NiFe LDH) by the preoxidation strategy of the core NiMoN layer are synthesized for ensuring the high catalytic performance and stability. Owing to the enhanced electron coupling and preoxidation process, the obtained Mo-NiO@NiFe LDH exhibits a superlow overpotential of 253 mV to achieve a practically relevant current density of 1000 mA cm −2 for OER with exceptional stability over 1200 h. Notably, the overall water splitting system based on Mo-NiO@NiFe LDH reveals remarkable stability, maintaining the catalytic activity at a current density of 1000 mA cm −2 for 140 h under industrial harsh conditions. Furthermore, the Mo-NiO@NiFe LDH demonstrates outstanding activity and long-term durability in a practical alkaline electrolyzer assembly with a porous membrane, even surpassing the performance of IrO 2 . This work provides a new sight for designing and synthesizing highly stable heterojunction electrocatalysts, further promoting and realizing the industrial electrocatalytic OER.

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Section: Resultsmentioning

confidence: 81%

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Ye,

Yuan,

Peng

et al. 2024

ACS Appl. Mater. Interfaces

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“…In situ Raman spectroscopy was conducted to investigate the dynamic OER process (Figure ). ,, Herein, 0.1 M KOH was used as the electrolyte to prevent signal attenuation from the vigorous bubbling that may occur in the 1 M KOH solution under high-OER-potential conditions. Previous reports investigated the in situ Raman spectroscopy of Ni(OH) 2 using various KOH concentrations and yielded similar results .…”

Section: Resultsmentioning

confidence: 99%

Balance between Fe^IV–Ni^IV synergy and Lattice Oxygen Contribution for Accelerating Water Oxidation

Jing,

Li,

Chin

et al. 2024

ACS Nano

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Hydrogen obtained from electrochemical water splitting is the most promising clean energy carrier, which is hindered by the sluggish kinetics of the oxygen evolution reaction (OER). Thus, the development of an efficient OER electrocatalyst using nonprecious 3d transition elements is desirable. Multielement synergistic effect and lattice oxygen oxidation are two well-known mechanisms to enhance the OER activity of catalysts. The latter is generally related to the high valence state of 3d transition elements leading to structural destabilization under the OER condition. We have found that Al doping in nanosheet Ni–Fe hydroxide exhibits 2-fold advantage: (1) a strong enhanced OER activity from 277 mV to 238 mV at 10 mA cm–2 as the Ni valence state increases from Ni3.58+ to Ni3.79+ observed from in situ X-ray absorption spectra. (2) Operational stability is strengthened, while weakness is expected since the increased NiIV content with 3d8L2 (L denotes O 2p hole) would lead to structural instability. This contradiction is attributed to a reduced lattice oxygen contribution to the OER upon Al doping, as verified through in situ Raman spectroscopy, while the enhanced OER activity is interpreted as an enormous gain in exchange energy of FeIV–NiIV, facilitated by their intersite hopping. This study reveals a mechanism of Fe–Ni synergy effect to enhance OER activity and simultaneously to strengthen operational stability by suppressing the contribution of lattice oxygen.

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“…For industrial applications, water electrolysis needs to meet the strict criteria of achieving extremely large current densities (>500 mA cm –2 ) at low overpotentials, − and thus the possibility of industrial-scale application for Bi 0.2 NiFe LDH/NF was further evaluated. Specifically, the high current densities of 500 mA cm –2 and even 1 A cm –2 are obtained at low overpotentials of 342 and 373 mV, which are better than that of NiFe LDH/NF (498 and 580 mV).…”

Section: Resultsmentioning

confidence: 99%

Enhancing Electrocatalytic Water Oxidation of NiFe-LDH Nanosheets via Bismuth-Induced Electronic Structure Engineering

Xu,

Guo,

Lei

et al. 2023

ACS Appl. Mater. Interfaces

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Large current density for oxygen evolution from pyramidally-coordinated Co oxide

Cited by 17 publications

References 64 publications

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Balance between Fe^IV–Ni^IV synergy and Lattice Oxygen Contribution for Accelerating Water Oxidation

Enhancing Electrocatalytic Water Oxidation of NiFe-LDH Nanosheets via Bismuth-Induced Electronic Structure Engineering

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Large current density for oxygen evolution from pyramidally-coordinated Co oxide

Cited by 17 publications

References 64 publications

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Balance between FeIV–NiIV synergy and Lattice Oxygen Contribution for Accelerating Water Oxidation

Enhancing Electrocatalytic Water Oxidation of NiFe-LDH Nanosheets via Bismuth-Induced Electronic Structure Engineering

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Balance between Fe^IV–Ni^IV synergy and Lattice Oxygen Contribution for Accelerating Water Oxidation