ACS Applied Energy Materials
·
2021
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IF 6.024
Chuanliang Li,Yangyang Ren,Fan Gao,Baosong Li,Lanlan Li,Xinghua Zhang,Zunming Lu,Xiaojing Yang,Xiaofei Yu
Pt-based nanoframes with unique morphologies are one of the most promising catalysts for the oxygen reduction reaction (ORR). In this study, stacked Pd@PtPd core–shell rhombic dodecahedrons (Pd@PtPd RDs) were obtained by a solvothermal method, and then PtPd nanonets (PtPd NNs) were formed by etching of Pd@PtPd RDs with Fe(NO3)3 and HNO3. Combining the time-dependent changes of morphology, atomic ratio, and elemental distribution, the formation mechanism of PtPd NNs was explored. According to the electrochemical tests, the mass and specific activities of PtPd NNs were 4.7 and 7.6 times higher than those of Pt/C and 2.5 and 2.2 times as large as those of Pd@PtPd RDs in an alkaline solution, respectively. Meanwhile, PtPd NNs displayed higher stability than Pd@PtPd RDs and Pt/C. The enhanced catalytic performance might result from the unique open structures, the compressive strain, and the electron transfer from Pd to Pt atoms.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Wei Liang,Qian Zhang,Hao Duan,Shiqi Zhou,Yaxi Zhou,Wenhao Li,Wenjie Yan
To investigate the influence of surface gelatinization on cold plasma (CP) modification of starch , this study used CaCl 2 to modify maize starch by surface gelatinization , further combined with CP treatment and characterized its multi-scale structure and physicochemical properties. The results revealed that starch surface gelatinization causes roughness and fragmentation on the granule surface, and CP undergoes etching effects. The synergistic modification promotes starch degradation, as evidenced by molecular weight decrease and short-chain ratio increase. Although the growth rings, FT-IR patterns, and crystal types of starch remained unchanged, the synergistic modification induced a reduction in the short-range orderliness and crystallinity of starch, thus causing a decrease in the pasting properties and contributing to its solubility. Notably, the CP treatment improved the RDS and SDS contents of the gelatinized starch due to more active sites on the granule surface after gelatinization, and this finding may provide insight into the deep processing of starch.
研究领域:
食品科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Jiayu Zheng,Diandian Wang,Hao Duan,Jinhong Guo,Yue Zheng,Wenhao Li,Wenjie Yan
This study investigated the effects of microwave (MW, 300W, 900W), electron beam irradiation (EBI, 8, 24 KGy), and their combination (MW-EBI, EBI-MW) on the morphology, structure and physicochemical properties of red adzuki bean starch. MW or EBI treatments had little effect on starch morphology, but high-frequency MW and high doses of EBI combined modification resulted in starch granule cracking. Both EBI and MW treatments retained the C-type crystalline structure of the starch but reduced the relative crystallinity, Mw, and short-range ordering. Besides, starch's short chain (A, B 1 ) content, pasting temperature, solubility, and RDS content were significantly increased. In contrast, long chain (B 2 , B 3 ), SDS + RS content, ΔH, SP, and RDS content were decreased considerably after MW and EBI treatments. Furthermore, the effect of MW and EBI combined modification on starch was higher than the single modification, and the MW-EBI modification was more effective than EBI-MW. Therefore, this study provides a green and efficient method to modify starch, which helps to broaden the scope of starch application.
研究领域:
食品科学
·
淀粉化学
·
辐射技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Shuo Wang,Yong Yan,Yongping Du,Yuguo Zhao,Tongxian Li,Dong Wang,Peter Schaaf,Xiayan Wang
Recently, Ni-based chalcogenides havedemonstrated remarkable activity and selectivity for alcohol electrooxidation, but the mechanisms remain debated. This study synthesizes Ni-based electrodeswith different chalcogen anion coordination on nickel nanorod arrays (NiO x /Ni,NiS x /Ni, and NiSe x /Ni NRAs). NiSe x /Ni NRAsshowcases superior performance (Faradaic efficiency 92.9%) in glycerolelectrooxidation reaction (GOR). In situ spectroscopy reveals that NiSecoordination inhibits deep oxidative reconstruction of the Ni-based interface, preventingNiOOH phase formation during GOR, enhancing activity and stability of NiSe x /NiNRAs. Conversely, NiS and NiO coordination lead to deep reconstruction with NiOOHphase formation, limiting GOR performance. Differently, during competingreaction of GOR, the oxygen evolution reaction (OER) leads to deepreconstruction of NiSex interface due to the instability of Ni-Sebonds, inducing performance degradation and dissolution of Se components. Furthermechanism investigation elucidates that the rate-determining step (RDS) ofGOR at the NiSe x interface involves oxidation of *C 2 H 3 O 3 intermediatesthrough H 2 O adsorption, favoring stable formate production.Contrarily, the RDS at the NiS x , NiO x , and NiOOHinterfaces predominantly focus on the decarboxylation of multi-carbon intermediates, raisingenergy barriers and over-oxidizing formate to CO 2 . These results providenew insights for designing Ni-based non-oxide catalysts forefficient and stable electrocatalytic oxidation.
研究领域:
电化学
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材料科学
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催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yanyan Li,Haoran Guo,Jiayang Zhao,Kanglei Pang,Rui Song
Surface reconstruction generates genuine active phases under an electrochemical oxygen evolution reaction (OER); however, most OER catalysts exhibit slow self-reconstruction due to their relative stability in electrochemistry. Therefore, it is highly essential to rationally design precatalysts capable of rapidly generating more active OER species. Herein, a novel reconfigurable Te-doped NiFe layered double hydroxide (Te-NiFe LDH/NF) precatalyst is prepared, which exhibits ultrafast and in-depth self-reconstruction, significantly enhancing the activity for the OER step. By employing various in/ex situ techniques and theoretical calculations, the distinctive structure of Te-NiFe LDH/NF along with the alkaline electrolyte are identified as pivotal factors for facilitating the phase transition. The presence of Te cations can effectively reduce the energy barrier, thereby providing the feasibility of continuous reconstruction, while the alkaline electrolyte supplies a complement of OH– to form highly active oxyhydroxides. Besides, Te is doped in situ into the NiFeOxHy lattice (Te-NiFeOxHy/NF), leading to optimized binding energies of the OER intermediates and reduced energy barriers for the rate-determining step (RDS), ultimately enhancing the OER performance. As such, the self-restructured Te-NiFeOxHy/NF only required 208 and 310 mV to achieve 10 and 500 mA cm–2, respectively, together with high current stability for 300 h. This study provides a rational design strategy to develop highly efficient electrocatalysts for the OER through surface reconstruction.
研究领域:
材料科学
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电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Xiuxiu Yin,Yuxue Zheng,Xiangli Kong,Shuyun Cao,Shiguo Chen,Donghong Liu,Xingqian Ye,Jinhu Tian
The effects RG-І pectin (0.5, 1, 2, 5 and 10%, w/w) on the gelatinization behaviour, gel structure and digestibility of potato starch were characterized by means of rapid viscosity analysis (RVA), rheometry, scanning electron microscopy (SEM) and in vitro digestion. Results indicated that the addition of RG-I pectin significantly decreased the peak and breakdown viscosity and prolonged the pasting temperature of potato starch, but increased the setback viscosity. Meanwhile, the swelling power and amylose leaching of starch granules were restrained because of RG-I pectin adsorption on the starch granules surface. The presence of RG-I pectin also decreased the G’ values of potato starch gel but increased the tan δ values (especially for 1%), indicating that RG-І pectin decreased the 3D network formation of potato starch gel. The microstructure analysis indicated that RG-I pectin decreased the formation of the gel structure, which might place constraints on the relative amylose concentration in the continuous phase. The addition of RG-I pectin also reduced the rapidly digestible starch (RDS) content and increased the slowly digestible starch (SDS) content, while no significant differences of resistant starch (RS) content was observed. Those results indicated that RG-I pectin could affect the physicochemical properties of potato starch and modulate its digestibility and might be a potential option for producing starchy food with lower digestibility.
研究领域:
食品科学
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化学工程
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Wenjie Ma,Hairong Huang,Bing Zheng,Jianhua Xie,Yi Chen,Jiayan Xie,Ruihong Dong,Xiaobo Hu,Qiang Yu
With the increasing prevalence of diet-related chronic diseases, developing baked goods with functional properties to enhance health benefits is essential. This study developed a modified fermented soluble dietary fiber (F-SDF) bread, assessing the impact of added F-SDF on starch, protein, and volatile flavor compounds, alongside potential mechanisms. The results showed that incorporating 1.0% F-SDF effectively enhanced bread quality. Specifically, adding 1.0% F-SDF reduced total starch content (1.59%), specific volume (0.48 mL/g), ΔH (1.65°C), hardness and chewiness compared to the control (CK). Additionally, adding 1.0% F-SDF increased the resistant starch content (1.72%), α -helix value (1.74%), relative crystallinity (2.68%), the short-range ordered structure (3.78%), and bound water content of bread. Notably, both F-SDF and unmodified soluble dietary fiber (R-SDF) reduced rapidly digestible starch (RDS) without a significant difference. Furthermore, Gas chromatography-ion mobility spectrometry (GC-IMS) analysis indicated that F-SDF incorporation introduced new volatile compounds, including Butyraldehyde and 1-Hexanol, while preserving key flavor compounds such as Hexanal and Ethyl acetate. Overall, this study expands the applications of F-SDF in baked goods and offers insights into the development of fiber-rich foods.
研究领域:
食品科学
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营养学
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烘焙科学
·
膳食纤维研究
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Baojie Zhang,Changti Pan,Hengjie Liu,Xingshun Wu,Hongliang Jiang,Li Yang,Zeming Qi,Guang Li,Lei Shan,Yunxiang Lin,Li Song,Yong Jiang
Urea oxidation reaction (UOR) has emerged as a competitive approach for many energy-related technologies due to the low overpotential and fast reaction dynamics. The main challenge lies in fabricating high-efficient catalysts with optimized electronic structure and understanding the intrinsic structure-related mechanisms. Here, we report a feasible strategy of regulating the rate-determining step (RDS) of UOR via an electrochemical reconstructed Co hydroxide catalyst incorporated with V single atoms. The optimal catalysts exhibit an enhanced UOR performance after V incorporation while remarkably suppressed the competitive oxygen evolution with the potential of 1.54 V (vs RHE) to achieve the current density of 30 mA cm −2 . Operando synchrotron-radiation Fourier transform infrared spectroscopy (SR-FTIR) combining density functional theory (DFT) calculations reveal that enabled by single atom V incorporation, the RDS of UOR has been changed from the first deprotonation step to the second one with a lower energy barrier of 2.05 eV (vs 2.6 eV), which is thermodynamically favorable for the overall reaction process.
研究领域:
电化学
·
材料科学
·
催化
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Yuru Zhou,Jing Hu,Yinan Liu,Wenyu Fan,Panpan Tao,Rui Yang,Haitao Huang,Xun Cao,Haijin Li,Siwei Li
Designing noble metal-free electrocatalysts remains a challenge for the oxygen evolution reaction (OER) in alkaline solutions. In this study, we present a facile electrodeposition approach coupled with an in situ anodic oxidation method to synthesize NiOOH–MnS/NF on nickel foam (NF), successfully creating NiOOH–MnOOH/NF heterojunctions to boost OER performance under alkaline conditions. The heterojunction's synergistic effect significantly modulates the adsorption energy of the rate-determining step (RDS), thereby enhancing the intrinsic electrocatalytic activity of the NiOOH–MnOOH/NF electrocatalyst. Furthermore, the introduction of SO42− leads to a variable degree of electron loss in both Mn and Ni, reducing adsorption strength of the OER intermediates and thus optimizing reaction kinetics. The as-prepared NiOOH–MnOOH/NF electrocatalyst demonstrates exceptional OER performance in 1.0 M KOH, achieving a current density of 100 mA cm−2 with a Tafel slope of 52.3 mV dec−1 and a minimal overpotential of 391 mV. Utilizing NiOOH–MnOOH/NF as a bifunctional electrode for overall water splitting (OWS), the system operates at a low potential of 1.66 V at 10 mA cm−2, showcasing its excellent durability. This work offers novel insights and promising prospects for the advancement and practical application of non-precious metal electrocatalysts in the field of electrocatalytic water splitting.
研究领域:
电化学
·
材料科学
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催化
·
能量转换与存储
✓ 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）