Green Energy & Environment
·
2021
·
IF 8.207
Dashui Yuan,Zongyuan Li,Xueru Chen,Jing Ding,Hui Wan,Guofeng Guan
Proper interface and band alignment always play essential roles in the separation of photoexcited charge of photocatalysts. In this work, we prepared a homodispersed S-scheme carbon nitride homojunction with local electron structure difference by a facile pre-doping and two-step calcination approach. Boron doping into heptazine created extra acceptor impurity, and phosphorus doping into heptazine created extra donor impurity, which eventually modulated the electronic structure of carbon nitride. As heptazines with different element doping were integrated into carbon nitride by recalcination, B–CN and P–CN formed a homodispersed homojunction and thus produced a rich interface. Meanwhile, caused by Fermi energy levels equilibrium, the band bending constructed an S-scheme homojunction, which stimulated photogenerated electrons to transfer from CB of B–CN to VB of P–CN. The homodispersed S-scheme homojunction structure led to efficient suppression of recombination of photoinduced charge and retained stronger redox charge. Consequently, the photocatalytic performance was dramatically boosted to 2620 μmol g −1 from 60 μmol g −1 of pure CN in 4-h hydrogen evolution from water. This novel method for electron structure engineering helped to provide a new strategy for designing homojunction photocatalysts with excellent photocatalytic performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FlatChem
·
2022
·
IF 5.829
Shuting Hu,Yuheng Liang,Fuming Chen,Guannan He,Yinzhen Wang,Wei Li,Qinyu He
It is important for organic pollutants to be completely degraded without intermediates. In this work, a novel wide-spectrum-response oxygen-rich double direct Z-scheme heterojunction-structured photocatalyst, g-C 3 N 4 (precursor: urea, CN-U)/g-C 3 N 4 (precursor: thiourea, CN-T)/Bi 2 WO 6 (UTB), was prepared. The ternary system was confirmed by structural analysis and surface and morphological studies. The photocatalytic performances of the synthesized catalysts were estimated by photodegrading rhodamine B (RhB) solution. A more than 92 % mineralization and improved photocatalytic activity were achieved. UTB showed an outstanding photocatalytic performance for RhB degradation compared to CN-T, CN-U, Bi 2 WO 6 , and their binary nanocomposites.The improved photocatalytic properties and n more than 92 % mineralization were attributed to the double direct Z-scheme and oxygen vacancies, which maintained the outstanding redox capability of the electrons, expanded the range of light absorption, and facilitated the separation of photogenerated carriers. This study has demonstrated the prospect in obtaining a double Z-scheme structured photocatalysts with simultaneously high redox potential and narrow E g . This work has also offered a new strategy for fabricating low-consumption and efficient photocatalysts that mineralize more than 92 % of organic pollutants without existing intermediates.
研究领域:
环境科学
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材料科学
·
光催化
·
污染物降解
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 8
·1285-1289
·
IF 7.411
Yuhou Pei,Chaonan Mu,Haixia Li,Fujun Li,Jun Chen
Graphical Special K : Low-cost K 4 Fe(CN) 6 was studied as a cathode for potassium-ion batteries, which exhibit a high voltage of approximately 3.6 V and long lifespan of 400 cycles with an average capacity decay of 0.063 % per cycle. These are endowed by the highly reversible [Fe(CN)] 3−/4− redox couple for charge compensation, with enhanced ionic and electrical conductivity. Potassium-ion batteries (KIBs) are of interest for large-scale electrical energy storage, owing to the abundance of K resources and potential high energy density. Low-cost cathodes with high performance are crucial for KIBs. Herein, K 4 Fe(CN) 6 is shown to be a low-cost and high-voltage cathode for KIBs. It can deliver a high voltage of approximately 3.6 V and a discharge capacity of 65.5 mAh g −1 with a lifespan of 400 cycles of discharge and charge. This is attributed to the strong σ bonds between C atoms and Fe and to the reduced particle size and good contact with conductive carbon brought about by ball milling, which benefit both the K + ion and the electronic conduction. The [Fe(CN) 6 ] 3−/4− redox couple is found to be responsible for charge compensation upon reversible extraction/insertion of K + from/into K 4 Fe(CN) 6 . The high voltage and stability of K 4 Fe(CN) 6 will make it a promising low-cost cathode for KIBs and encourage more investigations into high-performance cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Wenting Chen,Hua Liang,Xin Wen,Zongchen Li,Hui Xiong,Qiang Tian,Minhao Yan,Yuanzhi Tan,Guy Royal
To explore the effect of sensor structure on anions detection, three new hydrazones P-CN , P-CF 3 and P-NO 2 having different electron-withdraw groups are synthesized. Their anions recognition properties are investigated compared with those of P-OMe , P-H and acylhydrazone B-NO 2 . It shows all non-nitro hydrazones exhibit increasing sensitivity specifically toward CN − in the order of P-OMe < P-H < P-CN < P-CF 3 , indicated by color change from colorless to different shades of blue. Whereas P-NO 2 responds to CN − , F − and H 2 PO 4 − concurrently and its sensitivity to CN − is more than 4 times higher compared with that of the other hydrazones. CN − can be discriminated from F − by P-NO 2 in acetonitrile/water. On the other hand, B-NO 2 has only discernible response to CN − and F − with less sensitivity than P-NO 2 does. Detection details of P-NO 2 to CN − are investigated by titration, anti-interference tests, Job’s plot, HRMS, pH effect assays. The 1 H NMR, IR and reversibility tests demonstrate the deprotonation mechanism. The detection mechanisms of P-NO 2 and B-NO 2 to CN − are compared and demonstrate the reason of their recognition difference. The detection limits of P-NO 2 to CN − , F − and H 2 PO 4 − in acetonitrile are 0.0477 μM, 0.0876 μM and 1.46 μM, respectively. Hence, this work indicates that strong electron-withdraw group in related probes can improve their anion detection ability, meanwhile conjugation effect should be also considered in structure designing.
研究领域:
分析化学
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材料科学
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化学传感器
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 11
·3658-3663
·
IF 4.052
Naike Shi,Qilong Gao,Andrea Sanson,Qiang Li,Longlong Fan,Yang Ren,Luca Olivi,Jun Chen,Xianran Xing
Negative thermal expansion (NTE) behavior is an interesting physical phenomenon, but the number of NTE materials is limited. In this study, a new NTE compound has been found, FeFe(CN)6 Prussian blue analogue, where the average linear coefficient of thermal expansion (αl) is −4.260 × 10−6 K−1 between 100 and 450 K. The NTE properties and local vibration dynamics have been investigated by joint experiments of synchrotron X-ray diffraction, X-ray pair distribution function, and extended X-ray absorption fine structure spectroscopy. It has been observed that the Fe–C/Fe–N bonds expand with increasing temperature, while the unit cell shrinks in FeFe(CN)6. The vibration directions of both Fe–C and Fe–N prefer to be perpendicular to the linkage of Fe–CN–Fe rather than being parallel. More pieces of evidence indicate that the transverse vibrations of N atoms dominate the NTE behavior of FeFe(CN)6. The present results prove directly that the transverse thermal vibrations of C and N atoms are crucial for the occurrence of the NTE of Prussian blue analogues.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 11
·8541-8552
·
IF 4.6
Hui Zhang,Yi Hui Sun,Sheng Li An,Rui Hua Guo,Rui Fen Wang,Yu Wei Ma
S-type heterojunction photocatalysts (CeCux-BTC/CN) of cerium-copper bimetallic organic framework (CeCux-BTC) and graphitic carbon nitride (g-C3N4) were constructed by a simple solvothermal method using cerium nitrate, copper nitrate, and urea as the raw materials, and 1,3,5-benzene-tricarboxylic acid as the ligand for the photocatalytic CO2 reduction to CO and CH4. The results show that the built-in electric field constructed by Fermi energy level flattening transfers the electrons in an S-type manner, which not only preserves the strong reducing properties of the electrons in the material but also provides the maximum redox capacity and enables the composite samples to obtain higher visible-light trapping capacity and improve the separation efficiency of the carriers while refining the crystal particles. With the addition of only 1 mL of H2O as the proton supply source, CeCu0.05-BTC/CN exhibits the optimal photocatalytic performance. The CO and CH4 yields were 64.44 and 0.5575 μmol g−1, which were 7.56 and 2.42 times higher than those of g-C3N4, respectively, and the catalytic performances were basically stable after cycling tests.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuanzheng Zhang,Chao Liang,Kaihang Zhang,Yuxin Zeng,Yufei Zhou,Xiaoxia Zhang,Lifeng Yin,John Crittenden,Junfeng Niu
The persistent challenge of nitrate (NO 3 – ) pollution in water systems, profoundly impacting ecosystems and human health, demands effective remediation strategies. Here, we present an innovative S-scheme Cu@CN/TiO x heterojunction for high-efficiency photocatalytic denitrification (PCDN). Evaluation of its performance demonstrates exceptional NO 3 – removal efficiency (99.5%) and remarkable N 2 selectivity (95.5%), with 13.7 and 4.1 times higher rate constants of NO 3 – removal than the individual Cu@CN and TiO x components. Notably, this catalyst exhibits impressive stability across multiple cycles, maintaining consistent high conversion rates and selectivity. Mechanistic insights unveiled a tandem reaction pathway where Cu@CN selectively reduced NO 3 – to NO 2 – , followed by the TiO x -mediated CO 2 • – generation, enabling highly selective NO 2 – to N 2 conversion. This unique catalytic system, featuring spatially separated redox-active sites, presents a promising avenue for efficient, selective, and stable denitrification processes, offering significant potential in addressing water pollution challenges and advancing tandem catalytic systems.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 29
·23827-23835
·
IF 4.6
Haoxi Chu,Bo Jin,Yang Zhao,Rufang Peng
The fullerene derivative C60-CM-Cn was synthesized via a two-step reaction using fullerene (C60), curcumin (C21H18O5), and bromoalkanes (RBr) as raw materials. The structure of C60-CM-Cn was characterized by nuclear magnetic resonance (1H and 13C NMR) and high-resolution mass spectrometry (HR MS). Thermal analysis, including differential thermal analysis (DTA), vacuum stability tests (VST), thermogravimetric analysis (TG), and methyl violet experiments, along with electron paramagnetic resonance spectroscopy, was used to investigate the interaction mechanism between C60-CM-Cn and nitrocellulose (NC). The results demonstrated that there is good compatibility between C60-CM-Cn and NC, C60-CM-Cn extended the color change time of methyl violet paper by 28–47 min, reduced the gas released during the thermal decomposition of NC by 0.7–1.69 mL g−1, and decreased the heat loss rate of NC by 9.8–15.6%. Additionally, at a minimum concentration of 0.19 g L−1, C60-CM-Cn achieved a 50% removal rate of nitrogen oxides (NOx). These findings indicate that C60-CM-Cn serves as an effective antioxidant for the removal of nitrogen oxides from NC fibers, outperforming traditional stabilizers such as diphenylamine (DPA) and C2 in improving NC stability.
研究领域:
材料科学
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化学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EES Catalysis
·
2024
·
IF 0
Xiao Yu,Chuang Zhao,Lixia Yang,Jian Zhang,Chunlin Chen
The Pt-Mn2O3/CN catalyst formed through the synthesis via the solvent-thermal method involves a synergistic combination of polymer CN and Pt nanoparticles loaded on Mn2O3 to catalyze the degradation of toluene. The composition incorporates Mn2O3 as the central element for photothermal conversion, CN as a uniformly dispersed matrix for Pt nanoparticles, and Pt as the catalytically active center, demonstrating significant efficacy. Particularly noteworthy is the discernible enhancement in the photothermal catalytic degradation capability of the Pt-Mn2O3/CN composite catalyst, specifically in the context of toluene. When subjected to light intensity of 300 mW cm-2 and a toluene concentration of 400 ppm, Pt-Mn2O3/CN achieves toluene conversion and CO2 mineralization rates of 99% and 80.9%, respectively. This improvement primarily stems from the Pt nanoparticles inducing a substantial presence of oxygen vacancies within the catalyst structure, thereby increasing oxygen adsorption capacity and surface mobility. This, in turn, activates adsorbed oxygen species at the catalyst’s interface. The adept utilization and conversion of solar irradiance for volatile organic compound (VOC) abatement underscore its potential as an environmentally friendly and renewable energy source.
研究领域:
环境科学
·
材料化学
·
催化化学
✓ 已验证
DOI
ELECTROCHEMISTRY
·
2019
·Vol. 87
·期 4
·214-219
·
IF 1.293
Jianhong LU,Mingyong WANG,Xiaomei DENG,Jianhei YAN,Jimmy YUN,Shuqiang JIAO
Potassium ferricyanide (K3Fe(CN)6) as a stabilizer was used for electroless copper plating in EDTA/THPED dual-ligands system. The deposition behavior and surface structure of copper layer were studied systematically. The results indicated that the overall deposition process was divided into three regions designated as induction, transitional and stable regions. It was confirmed that K3Fe(CN)6 can delay the fall-off trend of electrode potential, which may be related to the competitive adsorption between Fe(CN)63− with large radius and OH− with small radius on the electrode surface. The addition of K3Fe(CN)6 led to a decrease of 70% in redox current density, which reduced obviously Cu deposition rate. Meanwhile, the decomposition time of electroless solution sharply increased and the reoxidation of Cu(I) ion was effectively inhibited in the presence of K3Fe(CN)6. Metallographic studies of copper layers with and without K3Fe(CN)6 stabilizer revealed that surface structures and fine particle distribution were uniform. The resultant product was high-purity without detectable iron impurities. Moreover, the addition of K3Fe(CN)6 was favorable to the formation of the preferred orientation on (220) crystal plane, and the grain size decreased from 61.5 nm to 40.4 nm with the addition of 50 mg L−1 K3Fe(CN)6.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2008
·
IF 2.394
Yunlai Ren,Zhifei Liu,Shuang Zhao,Xinzhe Tian,Jianji Wang,Weiping Yin,Shebin He
Commercially available and inexpensive ethylenediamine/Cu(OAc) 2 · H 2 O has been found to be a highly effective catalyst system for the cyanation of aryl bromides in the solvent of NMP. At the same time, the highly activated aryl chlorides with NO 2 groups gave corresponding benzonitriles in good yields. Similar to the previous observation, it is not necessary to use an excess of K 4 [Fe(CN) 6 ] in the cyanation reaction (only 20 mol% of K 4 [Fe(CN) 6 ] was used). In other hand, a more remarkable KI-accelerated effect was observed for the cyanation reaction: the addition of KI increased the yield from 6% to 91% in the cyanation of bromobenzene.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiuxuan Zhang,Chunhua Zhang,Hong Jiang,Yefei Liu,Rizhi Chen
Selective hydrogenation of phenol is a green strategy to produce cyclohexanone. Achieving high phenol conversion and cyclohexanone selectivity under mild conditions is a significant challenge in the design and synthesis of highly efficient catalysts. Herein, a highly efficient Pd@CN-rGO catalyst is synthesized by supporting Pd nanoparticles on the composite of ZIF-derived N-doped carbon and reduced GO (CN-rGO), which is prepared via annealing the composite of layered ZIF-L-Co and GO. The as-fabricated Pd1.2@CN-rGO-15 catalyst shows superior catalytic performance in phenol hydrogenation, and its turnover frequency (TOF) is 33.7 h–1, 3.2 times higher than that of Pd1.6/rGO and 1.5 times higher than that of Pd0.9@CN-rGO-0. The synergistic effect of CN and rGO leads to the uniform dispersion of Pd, high phenol adsorption ability, and strong antioxidizability of Pd, which contributes to the superior catalytic performance. More importantly, Pd@CN-rGO has good reusability in phenol hydrogenation. These findings will offer new insights into the development of high-performance catalysts for the selective hydrogenation of phenol.
研究领域:
化学工程
·
催化科学
·
绿色化学
✓ 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）