Surpassing electrocatalytic limit of earth-abundant Fe4+ embedded in N-doped graphene for (photo)electrocatalytic water oxidation

Xue, Wenjia; Cheng, Feng; Li, Menglu; Hu, Wenjian; Wu, Congping; Wang, Bing; Liao, Kuo-Wei; Yu, Zhen‐Tao; Yao, Yingfang; Luo, Wenjun; Zou, Zhigang

doi:10.1016/j.jechem.2020.05.053

Cited by 10 publications

(3 citation statements)

References 51 publications

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“…However, in this work no significant peak was observed at the binding energy of ∼736 eV that relates to the expected position of the 2p orbit of Fe 4+ (Fe Fe • ) (Figure 4b) 42 and, as such, the mechanism described by eq 10 on both the dense and porous BF-BT does not appear to be significant here. The observed increased oxygen vacancy concentration is therefore most likely related to increased bismuth loss in the porous BF-BT during sintering, which is promoted by the higher surface area due to the presence of porosity.…”

Section: Structural Characterizationcontrasting

confidence: 46%

Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite–Barium Titanate Ceramics

Narayan,

Li,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Lead-free BiFeO 3 −BaTiO 3 (BF-BT) piezoceramics have sparked considerable interest in recent years due to their high piezoelectric performance and high Curie temperature. In this paper, we show how the addition of highly aligned porosity (between 40 and 60 vol %) improves the piezoelectric performance, sensing, and energy harvesting figures of merit in freeze-cast 0.70BiFeO 3 −0.30BaTiO 3 piezoceramics compared to conventionally processed, nominally dense samples of the same composition. The dense and porous BF-BT ceramics had similar longitudinal piezoelectric coefficients (d 33 ) immediately after poling, yet the dense samples were observed to age faster than those of porous ceramics. After 24 h, for example, the porous samples had significantly higher d 33 values ranging from 112 to 124 pC/N, compared to 85 pC/N for the dense samples. Porous samples exhibited 3 and 5 times higher longitudinal piezoelectric voltage coefficient g 33 and energy harvesting figure of merit d 33 g 33 than dense samples due to the unexpected increase in d 33 and decrease in relative permittivity with porosity. Spontaneous polarization (P s ) and remnant polarization (P r ) decrease as the porosity content increased from 37 to 59 vol %, as expected due to the lower volume of active material; however, normalized polarization values with respect to porosity level showed a slight increase in the porous materials relative to the dense BF-BT. Furthermore, the porous ceramics showed improved temperature-dependent strain−field response compared to the dense. As a result, these porous materials show excellent potential for use in high temperature sensing and harvesting applications.

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Section: Structural Characterizationcontrasting

confidence: 46%

Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite–Barium Titanate Ceramics

Narayan,

Li,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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“…prepared a self‐supporting CC@MOF‐74(NiO)@NiCo LDH heterostructure electrode with 3D flower‐like multistage structures, showing excellent super‐capacitive and sensing properties. [ 13 ] Zheng et al. found that hierarchical FeNi‐LDH/MOF catalysts exhibited enhanced OER activity profiting from the abundant metal sites and the extended electron transport channels from the ultra‐thin LDH arrays.…”

Section: Introductionmentioning

confidence: 99%

“…[12] Yin et al prepared a self-supporting CC@MOF-74(NiO)@NiCo LDH heterostructure electrode with 3D flower-like multistage structures, showing excellent super-capacitive and sensing properties. [13] Zheng et al found that hierarchical FeNi-LDH/MOF catalysts exhibited enhanced OER activity profiting from the abundant metal sites and the extended electron transport channels from the ultra-thin LDH arrays. [14] Zhou et al demonstrated that the pseudomorphic transformation of FeNi-MOF into LDH under alkali conditions could be utilized to prepare hybrid catalysts with promising OER activity.…”

Section: Introductionmentioning

confidence: 99%

A Kinetic Control Strategy for One‐Pot Synthesis of Efficient Bimetallic Metal‐Organic Framework/Layered Double Hydroxide Heterojunction Oxygen Evolution Electrocatalysts

Wang

Huang

et al. 2023

Adv Funct Materials

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Heterojunction materials are promising candidates for oxygen evolution reaction (OER) electrocatalysts to break the linear scaling relationship and lower the reaction barrier. However, the application of heterojunction materials is always hindered by the complicated multistep synthetic procedures which bring cost, complexity, and reproducibility issues. Herein, a strategy of kinetic controlled synthesis is developed to achieve the one-pot formation of bimetallic metal-organic framework (MOF)/layered double hydroxide (LDH) heterojunction electrodes as highly efficient OER electrocatalysts. The heterojunction electrodes present hierarchical structures with highly porous NiFe-LDH nanosheet networks vertically grown on the surface of NiFe-MOF-74 microprisms, promoting fast mass transport and high exposure of active sites. The strong interactions at the MOF/LDH heterojunction interfaces contribute to the outstanding OER activity surpassing the state-of-art RuO 2 OER catalysts. The MOF/LDH heterojunction electrode exhibits an ultralow overpotential of only 159.7 mV to reach the current density of 10 mA cm −2 , and yields large current densities at small overpotential (100 mA cm −2 at 230.2 mV and 1000 mA cm −2 at 284.3 mV) with long-term durability. This study presents an innovative approach to construct heterojunction materials with simple onestep synthesis, offering a promising pathway for high-efficiency electrocatalyst development.

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Coordination Engineering of Carbon Dots and Mn in Co‐Based Phosphides for Highly Efficient Seawater Splitting at Ampere‐Level Current Density

Fang,

Yu,

Han

et al. 2024

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Direct electrolysis of seawater to generate hydrogen is an attractive approach for storing renewable energy. However, direct seawater splitting suffers from low current density and limited operating stability, which severely hinders its industrialization. Herein, a promising strategy is reported to obtain a nano needle‐like array catalyst‐CDs‐Mn‐CoxP on nickel foam, in which the Mn─O─C bond tightly binds Mn, Carbon dots (CDs), and CoxP together. The coordination engineering of CDs and Mn not only effectively regulates the electronic structure of CoxP, but also endows the as‐prepared catalyst with selectivity and marked long‐term stability at ampere‐level current density. Low overpotentials of 208 and 447 mV are required to achieve 1000 mA cm−2 for hydrogen evolution reaction (HER) and Oxygen evolution reaction (OER) in simulated seawater, respectively. Cell potentials of 1.78 and 1.86 V are needed to reach 500 and 1000 mA cm−2 in alkaline seawater along with excellent durability for 350 h. DFT studies have verified that the introduction of Mn and CDs effectively shifts the d‐band center of Co‐3d toward higher energy, thereby strengthening the adsorption of intermediates and enhancing the catalytic activity. This study sheds light on the development of highly effective and stable catalysts for large‐scale seawater electrolysis.

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Surpassing electrocatalytic limit of earth-abundant Fe4+ embedded in N-doped graphene for (photo)electrocatalytic water oxidation

Cited by 10 publications

References 51 publications

Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite–Barium Titanate Ceramics

Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite–Barium Titanate Ceramics

A Kinetic Control Strategy for One‐Pot Synthesis of Efficient Bimetallic Metal‐Organic Framework/Layered Double Hydroxide Heterojunction Oxygen Evolution Electrocatalysts

Coordination Engineering of Carbon Dots and Mn in Co‐Based Phosphides for Highly Efficient Seawater Splitting at Ampere‐Level Current Density

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