Catalysis Science & Technology
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2024
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IF 4.4
Menghui Han,Fangyuan Cheng,Kui Xie
Porous single crystals (PSCs) are a novel class of solid-phase materials with tailored porosity. The long-range ordered lattice and interconnected pore structure in three dimensions enable them to minimize energy losses and maintain heightened catalytic activity and stability in electrochemical systems. In the process of electrocatalytic water splitting, transition metal oxides Fe2O3 and Co3O4 are regarded as highly promising catalytic materials for the oxygen evolution reaction (OER). Here, we employed a lattice reconstruction strategy to grow porous single crystals of Fe2O3 and Co3O4 through solid–solid phase transformation, utilizing FeS2 and CoS2 nano-octahedron single crystals as the parent crystals. PSC Fe2O3 and Co3O4 have large specific surface areas to provide enough electrocatalytic active sites while retaining the intrinsic properties of porous single crystals. Meanwhile, we quantitatively engineered Pt clusters/metal oxide interfaces on the surfaces of PSC Fe2O3 and Co3O4 to enhance the electrocatalytic performance. The PSC Pt/Co3O4 catalyst with lower overpotential (269 mV at 10 mA cm−2) exhibits optimal electrochemical performance in the OER, with no degradation observed within 25 hours. The structural consistency of these porous single crystal oxide catalysts, coupled with the construction of active interfaces, offers advantages in enhancing electrocatalytic activity and durability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Lin Yang,Jinxing Yu,Qingyang Fu,Lulu Kong,Xiaoxiang Xu
Grain boundaries serve as an interception to the transportation of photo-generated charges (e - and h + ), severely undermining the photocatalytic performance. In this work, SrNbO 2 N porous single crystals (PSCs) free of grain boundaries have been synthesized, which deliver exceptionally high photocatalytic activity and stability for water oxidation reactions. The removal of grain boundaries warrants fast charge transportation, reducing the risks of charge recombination. The high porosity of PSCs supplies ample inner surface to carry out catalytic reactions . Deposited with a proper cocatalyst , SrNbO 2 N PSCs can photocatalyze water oxidation into O 2 with apparent quantum efficiency (AQE) as high as 5.64% at 420 ± 20 nm. The high activity is also exemplified by integrating SrNbO 2 N PSCs into a Z-scheme system which can split water into H 2 and O 2 in stoichiometry under simulated solar insolation. These findings not only prove that PSCs expedite charge migration, triggering a high activity for photocatalytic reactions, but also enliven more attention upon traditional materials that hold the potential for solar energy conversions.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Lin Yang,Qingyang Fu,Lina Wang,Jinxing Yu,Xiaoxiang Xu
Porous single-crystalline SrTaO 2 N, combining structural homogeneity and high porosity, afford a great promise as an active photocatalyst. The lack of grain boundaries in SrTaO 2 N porous single crystals (PSCs) enables fast photocarrier migration from bulk to the surface whilst the high porosity offers adequate accessible surface to perform photocatalytic reactions. In this work, we demonstrate a facile synthesis of SrTaO 2 N PSCs via a topotactic conversion route. These SrTaO 2 N PSCs deliver exceptional activity and stability for photocatalytic O 2 production from water with a record-breaking apparent quantum efficiency as high as 17.9% at 420 ± 20 nm. Overall water splitting with H 2 /O 2 equals 2 has also been attained in a Z-scheme system employing SrTaO 2 N PSCs as the O 2 -evolution moiety. These results signify a paradigm to improve photocatalytic performance based on PSCs, which extends the toolbox to achieve efficient solar water splitting over conventional photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jiao Wang,Feng Zheng,Mingjun Li,Donghua Jia,Xiaodong Mao,Jifang Fu,Pengfei Hu,Qiang Zhen,Yi Yu
In this paper, four NiO nano-arrays with different morphology on nickel foam were synthesized by a hydrothermal approach. It is found that the porous single crystal NiO nanoflake array (PNFA) holds superior electrochemical properties , better than the other three samples. The specific capacitance of the PNFA obtained from the cyclic voltammetry curve was 716 F g −1 and that derived from the galvanostatic charge-discharge curve was 589 F g −1 in three-electrode system. The cycling stability of the PNFA could retain as high as 92.4% after 5000 cycles. When the PNFA was assembled into a symmetric supercapacitor , the PNFA//PNFA device exhibited an energy density of 39.3 W h kg −1 (at 550 W kg −1 ) and could retain 13.2 W h kg −1 (at 11,000 W kg −1 ) in two-electrode system. Furthermore, the SEM, XRD, TEM and XPS results prove that the PNFA is a special porous single crystal structure, which combines the advantages of the cross-linked single crystal structure for facilitating electron transfer and the porous structure providing more interfaces for insertion/exit of electrolyte ions from the active material. It indicates that the PNFA is a potential electrode material for supercapacitors .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Shufang Chang,Jinxing Yu,Ran Wang,Qingyang Fu,Xiaoxiang Xu
LaTaON2 porous single crystals (PSCs), integrating structural coherence and porous microstructures, will warrant promising photocatalytic performance. The absence of grain boundaries in PSCs ensures rapid photocarrier transportation from bulk to the surface, thereby mitigating photocarriers’ recombination. Porous microstructures not only provide ample reachable surface to host photochemical reactions but also reinforce photon-matter interactions by additional photon reflection/scattering. Here, we have synthesized LaTaON2 PSCs via a topotactic route and show significantly improved photocatalytic performance. Efficient water oxidation into O2 has been realized by LaTaON2 PSCs with an apparent quantum efficiency as high as 5.7% at 420 ± 20 nm. Stable overall water splitting into stoichiometric H2 and O2 has also been achieved in a Z-scheme setup using LaTaON2 PSCs as the O2 evolution photocatalyst. These results not only prove that PSCs facilitate photocarrier migrations, which in turn deliver exceptional photocatalytic performance, but also imply that PSCs are useful to reinvigorate conventional semiconductor photocatalysts toward efficient solar energy conversions.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Jun Teng,Minqi Chen,Yanyu Xie,Dawei Wang,Ji-Jun Jiang,Guangqin Li,Hai-Ping Wang,Yanan Fan,Zhang-Wen Wei,Cheng-Yong Su
Nanoreactors constructed by encapsulation of catalytic species in hierarchically porous metal–organic framework (HPMOF) nanostructures have emerged as a type of promising catalysts that deliver enhanced conversion and excellent selectivity/stability. However, the controlled synthesis of small HPMOF nanocrystals with tunable size and nanostructures remains challenging. Here, by coupling external ultrasonication with the inherent binding competitions between the metal ions of bimetallic Co/Zn-ZIF, we design and develop a new strategy, dynamic growth, for the facile synthesis of small (down to ca. 95 nm), single-crystalline and structure-/size-tunable HPMOF nanocrystals through a one-pot, additive-free procedure. Benefiting from the combined structure/size regulation, nanoreactors based on our small nanocrystals of meso-HP-Co/Zn-ZIF-50% are able to deliver exceptional conversion while keeping their excellent selectivity and stability. Insights gained from this work opens a new avenue for the development of complex/dynamic coordination materials in which the compositions, structures, properties, and functions can be designed/tuned through the coupling of their inherent binding competitions with external stimuli.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）