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学者姓名：李钒
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摘要 ：
Oxygen evolution reaction (OER) is one of the most important components of various electrochemical systems such as water splitting, metal air batteries, and carbon dioxide reduction. However, the four-electron process of OER suffers from intrinsically sluggish kinetics, which contributes to significant overpotential in the electrochemical system. Herein, highly defective NiFeV layered triple hydroxide (LTH) catalyst was efficiently prepared using a one-step hydrothermal method. The crystal structure, electronic structure, and surface composition of NiFeV LTH were characterized by X-ray diffraction and photoelectron spectroscopy. Moreover, NiFeV LTH demonstrated a superior OER catalytic performance with-low overpotential (158 mV @10 mAcm-2), related small Tafel slope (102.3 mVdec-1), and long-term stability at a high current density of 100 mAcm-2. In situ Raman spectroscopy was applied to investigate the surface reconstruction during the OER process. It is revealed that Ni species were the most active sites at low overpotential, with the potential increasing subsequently Fe and V gradually participates in the catalytic reaction, the Fe and Ni species as OER catalytic active sites lead to the excellent OER catalytic activity of NiFeV LTH, and inhibited the further dissolution of high-valence NiOOH at high overpotential. The mechanism induced the outstanding activity and stability at high current densities in NiFeV LTH system. Dissolution of vanadium excited the active sites of NiFeV LTH synthesized by hydrothermal method which promoted both activity and stability, while the changes of surface species at different OER potentials were detected by in situ Raman spectroscopy.
关键词 ：
high stability high stability NiFeV LTH NiFeV LTH in situ Raman spectroscopy in situ Raman spectroscopy oxygen evolution reaction oxygen evolution reaction layered triple hydroxide layered triple hydroxide
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| GB/T 7714 | Li, Xi-Yuan , Xu, Lin-Cheng , Wang, Yue et al. Highly defective NiFeV layered triple hydroxide with enhanced electrocatalytic activity and stability for oxygen evolution reaction [J]. | FRONTIERS IN MATERIALS , 2024 , 11 . |
| MLA | Li, Xi-Yuan et al. "Highly defective NiFeV layered triple hydroxide with enhanced electrocatalytic activity and stability for oxygen evolution reaction" . | FRONTIERS IN MATERIALS 11 (2024) . |
| APA | Li, Xi-Yuan , Xu, Lin-Cheng , Wang, Yue , Yan, Yong , Feng, Ying-Jie , Li, Fan . Highly defective NiFeV layered triple hydroxide with enhanced electrocatalytic activity and stability for oxygen evolution reaction . | FRONTIERS IN MATERIALS , 2024 , 11 . |
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摘要 ：
Understanding the function of individual elements in high -entropy perovskites is one of the critical issues for the design of inexpensive and efficient bifunctional electrocatalysts. Here, we report our findings in boosting the electrochemical activity and durability of a high -entropy perovskite catalyst via sequential substitution of Sr2+ for the A -site elements. According to the Sr2+ localized tuned, the catalyst of (LaSmGdSrPr)0.2MnO3 has a halfwave potential of 0.786 V vs. RHE and an overpotential of 0.378 V and has better ORR and OER electrocatalytic activity than the Sr -free high -entropy perovskite catalyst (LaSmGdYPr)0.2MnO3.This is attributed to the local doping of Sr2+ activating the active center of the high -entropy perovskite catalyst (LaSmGdSrPr)0.2MnO3, modulating the adsorption energy of the oxygen -containing intermediates and the electronic structure of the transition metal at the B -site, which results in efficient oxygen electrocatalytic activity. On the other hand, the introduction of Sr2+ enhances the hybridization between Mn 2p and O 1 s and accelerates the adsorption and desorption kinetics of the intermediates, leading to both enhanced activity and durability of (LaSmGdSrPr)0.2MnO3. DFT theoretical calculations also demonstrate the key role played by Sr2+ in the highentropy perovskite structure for the improvement of the electrocatalytic activity. This study provides new insights for designing high -entropy electrocatalysts for various potential applications.
关键词 ：
Electronic structure Electronic structure High -entropy perovskite High -entropy perovskite DFT calculation DFT calculation Catalytic performance Catalytic performance
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| GB/T 7714 | Xu, Lincheng , Wang, Yue , Yan, Yong et al. Triggering efficient Mn active centers by tuning the localized Sr2+ sites in high-entropy ABO3 oxygen electrocatalysis [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 485 . |
| MLA | Xu, Lincheng et al. "Triggering efficient Mn active centers by tuning the localized Sr2+ sites in high-entropy ABO3 oxygen electrocatalysis" . | CHEMICAL ENGINEERING JOURNAL 485 (2024) . |
| APA | Xu, Lincheng , Wang, Yue , Yan, Yong , Hao, Zhanzhong , Chen, Xin , Li, Fan . Triggering efficient Mn active centers by tuning the localized Sr2+ sites in high-entropy ABO3 oxygen electrocatalysis . | CHEMICAL ENGINEERING JOURNAL , 2024 , 485 . |
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摘要 ：
Fe-N-C has a high number of FeNx active sites and has thus been regarded as a high-performance oxygen reduction reaction (ORR) catalyst, and combining Fe3C with Fe-N-C typically boosts ORR activity. However, the catalytic mechanism remains unknown, limiting further research and development. In this study, a precipitation-solvothermal process was used in conjunction with pyrolysis to produce a series of Fe-N-C catalysts derived from a zeolitic imidazolate framework (ZIF) that was composited with Fe3C. The prepared catalysts had a multiscale structure of ZIF-like carbon particles and rod-like structures, as well as bamboo-like carbon nanotubes (CNTs) and carbon layers wrapped with Fe3C particles while a series of studies revealed the origin of the rod-like structures and Fe3C phase. The hierarchical structure was beneficial to the enhanced electrocatalytic performance of catalysts for ORR. The optimal sample had the highest half-wave potential of 0.878 V vs. RHE, which was higher than that of commercial Pt/C (0.861 V vs. RHE). The ECSA of the optimal sample was 1.08 cm(2) mu g(-1), with an electron transfer number close to 4, and functioning kinetics. The optimal sample exhibited high durability and methanol tolerance for the ORR. Finally, blocking different Fe active sites with coordination ions demonstrated that Fe(ii) was the main active site, indicating that Fe3C primarily served as a cocatalyst to optimize the electron structure of Fe-N-C, thereby synergistically improving the ORR activity.
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| GB/T 7714 | Wang, Tanlun , Xu, Lincheng , Sun, Chenxiang et al. Synthesis of hierarchically structured Fe3C/CNTs composites in a FeNC matrix for use as efficient ORR electrocatalysts [J]. | RSC ADVANCES , 2023 , 13 (6) : 3835-3842 . |
| MLA | Wang, Tanlun et al. "Synthesis of hierarchically structured Fe3C/CNTs composites in a FeNC matrix for use as efficient ORR electrocatalysts" . | RSC ADVANCES 13 . 6 (2023) : 3835-3842 . |
| APA | Wang, Tanlun , Xu, Lincheng , Sun, Chenxiang , Li, Xiyuan , Yan, Yong , Li, Fan . Synthesis of hierarchically structured Fe3C/CNTs composites in a FeNC matrix for use as efficient ORR electrocatalysts . | RSC ADVANCES , 2023 , 13 (6) , 3835-3842 . |
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摘要 ：
Understanding the mechanisms by which rare-earth elements modulate the electronic structure and orbital filling of perovskites is essential for designing the highly active catalysts. Herein, by doping the A-site of LaMnO3 with Gd3+, the B-site active center is triggered, which effectively improving the covalency of Mn-O bond and increasing the oxygen vacancy concentration, also boosting the eg orbital filling electron number of La0.8Gd0.2MnO3 closer to 1. Ultimately, the mass activity and turnover frequency of La0.8Gd0.2MnO3 are 2.4 and 4.3 times higher than LaMnO3. DFT calculations show that Gd doping optimises the electronic structure of La0.8Gd0.2MnO3, resulting in modulation of the suitable intermediate adsorption energy, thus improving the catalytic activity. Based on these results, Zinc-air cells were assembled with La0.8Gd0.2MnO3 as the cathode catalyst and exhibited high capacity and cycling stability. This work provides a new perspective for rare-earth optimised the intrinsic properties of perovskites and enhance the bifunctional electrocatalytic performance.
关键词 ：
Perovskite Perovskite DFT calculation DFT calculation Gadolinium dopant Gadolinium dopant Catalytic performance Catalytic performance Electronic structure Electronic structure
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| GB/T 7714 | Xu, Lincheng , Wang, Yue , Yan, Yong et al. Optimisation of the electronic structure by rare earth doping to enhance the bifunctional catalytic activity of perovskites [J]. | APPLIED ENERGY , 2023 , 339 . |
| MLA | Xu, Lincheng et al. "Optimisation of the electronic structure by rare earth doping to enhance the bifunctional catalytic activity of perovskites" . | APPLIED ENERGY 339 (2023) . |
| APA | Xu, Lincheng , Wang, Yue , Yan, Yong , Hao, Zhanzhong , Chen, Xin , Li, Fan . Optimisation of the electronic structure by rare earth doping to enhance the bifunctional catalytic activity of perovskites . | APPLIED ENERGY , 2023 , 339 . |
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摘要 ：
Carbon-composited 3D network V-O Magneli compounds V4O7-C were prepared through the colloid-impregna-tion-carbonthermic method. After Pt nanoparticles loading, electrocatalysts for the methanol oxidation reac-tion (MOR) with different Pt contents Pt/V4O7-C were obtained. The specific activity of 15% Pt/V4O7-C was 3847 mA/g, which was 2.4 times that of commercial Pt/C. After 3000s durability tests the 15% Pt/V4O7-C had a stability similar to the Pt/C (38% activity retention), and the 20% Pt/V4O7-C showed better durability (45% activity retention) than commercial materials. XPS results implied that a strong metal-support interaction occurred between the Pt and V4O7-C, which may enhance the MOR performance. Moreover, a designed CO stripping experiment proved that V4O7 could enhance the adsorption of OH- and the oxidation reaction of intermediates and restrain the adsorption of carbonyl species of MOR. The synergistic effect between Pt and V4O7-C was summarized. The interaction between Pt and Magneli oxides may provide a new idea for the design of high performance catalytic materials for electrocatalytic oxidation in the view of the adsorption of the reac-tion species.
关键词 ：
Magn?li phase oxide Magn?li phase oxide Electrocatalysis Electrocatalysis MOR MOR Hydroxyl adsorption Hydroxyl adsorption
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| GB/T 7714 | Wang, Yue , Zou, Haoran , Xu, Lincheng et al. Enhancing hydroxyl adsorption for methanol oxidation reaction (MOR) of Pt-loaded on carbon support 3D network Magn?li phase V4O7 composite [J]. | JOURNAL OF ELECTROANALYTICAL CHEMISTRY , 2023 , 932 . |
| MLA | Wang, Yue et al. "Enhancing hydroxyl adsorption for methanol oxidation reaction (MOR) of Pt-loaded on carbon support 3D network Magn?li phase V4O7 composite" . | JOURNAL OF ELECTROANALYTICAL CHEMISTRY 932 (2023) . |
| APA | Wang, Yue , Zou, Haoran , Xu, Lincheng , Yan, Yong , Li, Fan . Enhancing hydroxyl adsorption for methanol oxidation reaction (MOR) of Pt-loaded on carbon support 3D network Magn?li phase V4O7 composite . | JOURNAL OF ELECTROANALYTICAL CHEMISTRY , 2023 , 932 . |
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摘要 ：
The relationship between the interactions of valence, electronic structure and orbitals generated by rare-earth doped perovskites and the electrocatalytic mechanism is important research work. Herein, the experimental and theoretical studies prepared through La1-xSmxMnO3 show that the doping of Sm triggers the B-site active center, which will promote the ORR and OER kinetics at the catalyst interface, and ultimately give La0.7Sm0.3MnO3 (LSM0.3) which has the most positive half-wave potential of 0.70 V versus RHE and the smallest overpotential of 0.48 V. Meanwhile, the specific electron configuration of Sm reduces the grain boundary energy and suppresses Oswald maturation, which causes the smallest reduction for ORR current density during long-term operation. Finally, zinc-air cell assembled with LSM0.3 as a cathode catalyst can be cycled stably for 330 h at 1 mA cm(-2). This work provides new insight into the improved electrocatalytic performance of oxygen by rare-earth doped perovskites.
关键词 ：
density functional theory density functional theory catalytic performance catalytic performance rare earth elements rare earth elements perovskite perovskite
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| GB/T 7714 | Hao, Zhanzhong , Xu, Lincheng , Yan, Yong et al. Understanding the Effect of the Valence State of Perovskite B-Site Ions on Its Oxygen Electrocatalytic Performance [J]. | ADVANCED MATERIALS INTERFACES , 2022 , 9 (16) . |
| MLA | Hao, Zhanzhong et al. "Understanding the Effect of the Valence State of Perovskite B-Site Ions on Its Oxygen Electrocatalytic Performance" . | ADVANCED MATERIALS INTERFACES 9 . 16 (2022) . |
| APA | Hao, Zhanzhong , Xu, Lincheng , Yan, Yong , Li, Fan . Understanding the Effect of the Valence State of Perovskite B-Site Ions on Its Oxygen Electrocatalytic Performance . | ADVANCED MATERIALS INTERFACES , 2022 , 9 (16) . |
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摘要 ：
本发明公开了一种可调控高粘度流体成膜厚度及均匀性的装置，包括成膜盘、上连接杆、万向轴承、三角支架、下连接杆、磁摆、电磁铁、偏转轮和电机。本发明利用类似于地动仪的“悬垂摆原理”，在未通电时由于重力作用使成膜盘成水平状态；通电后通过轴承、连接杆以及电磁铁和磁摆的相互吸引作用使成膜盘与水平面成一定角度做倾斜圆周运动，保证了成膜的均匀性；通过调整偏转轮旋转速度可以控制成膜厚度；依据高粘度流体粘稠度的不同，通过调节电磁铁距偏转轮正中心的距离来调节成膜盘做倾斜圆周运动时与水平面所成角度，也能更好地调节成膜厚度以及均匀性问题。因此，解决了高粘度流体成膜厚度及均匀性不好调控的问题。
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| GB/T 7714 | 李钒 , 路楠 , 侯海元 . 一种可调控高粘度流体成膜厚度及均匀性的装置 : CN202210693854.7[P]. | 2022-06-19 . |
| MLA | 李钒 et al. "一种可调控高粘度流体成膜厚度及均匀性的装置" : CN202210693854.7. | 2022-06-19 . |
| APA | 李钒 , 路楠 , 侯海元 . 一种可调控高粘度流体成膜厚度及均匀性的装置 : CN202210693854.7. | 2022-06-19 . |
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摘要 ：
本发明公开了一种可以阴阳极转换的连续再生光电一体化污水处理装置，由两个圆筒反应室组成，贯流式转轮和绞龙是通过与电机相连的旋转驱动轴驱动的。当污水在贯流式转轮和绞龙的带动下进入第一圆筒反应室后，在紫外灯照射和电极作用下，污水中的特定物质在催化剂的作用下发生光催化和电催化反应，使其得以高效降解。抄板对催化剂起到搅拌的作用，使催化剂界面能够得到及时更新，促进催化过程的进行，也使催化剂的性能更加稳定。经孔板分离后的催化剂进入第二圆筒反应室，电极反转阴阳极转换使催化剂发生电还原反应，恢复其原有的催化效果，实现催化剂的再生，可以连续投入使用。
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| GB/T 7714 | 李钒 , 许林成 , 侯海元 et al. 一种可以阴阳极转换的连续再生光电一体化污水处理装置 : CN202210693845.8[P]. | 2022-06-19 . |
| MLA | 李钒 et al. "一种可以阴阳极转换的连续再生光电一体化污水处理装置" : CN202210693845.8. | 2022-06-19 . |
| APA | 李钒 , 许林成 , 侯海元 , 何瑜庥 . 一种可以阴阳极转换的连续再生光电一体化污水处理装置 : CN202210693845.8. | 2022-06-19 . |
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摘要 ：
本发明公开了一种连续雾化进样的聚合物合成反应装置，涉及化学反应合成装置领域。该装置由具有加热搅拌及气氛保护的反应部分和连续雾化进样部分组成，反应所需的雾化溶剂通过一定压力的气体连续吹入反应装置。该装置可保证在惰性气氛条件下，高温合成的过程中添加溶剂或反应物的安全性，通过气相吹扫带动连续雾化进样的方式可以减小进样时反应体系的温度变化，并使反应物与溶剂可以充分混合，调节进气量和雾化量可以控制溶剂或反应物的进样速率，进一步控制反应的速率，本发明在制备效率、合成安全性、反应条件控制等方面具有优势。
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| GB/T 7714 | 李钒 , 邹灏然 , 侯海元 et al. 一种连续雾化进样的聚合物合成反应装置 : CN202211669284.4[P]. | 2022-12-24 . |
| MLA | 李钒 et al. "一种连续雾化进样的聚合物合成反应装置" : CN202211669284.4. | 2022-12-24 . |
| APA | 李钒 , 邹灏然 , 侯海元 , 王越 , 许林成 , 李溪源 . 一种连续雾化进样的聚合物合成反应装置 : CN202211669284.4. | 2022-12-24 . |
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摘要 ：
本发明公开了一种可交换阴阳极反应室及搅拌电极填料的污水处理装置，由贯流式转轮和反应器两部分组成，贯流式转轮通过旋转驱动轴和反应器连接在一起。反应器分内层和外层两部分：通过绝缘材料将圆筒反应室内层分隔成四个填料室，每个填料室均为导电材料制备，相互之间通过绝缘孔板隔开；外层是固定在绝缘外壳上的两个电极，以银碳刷与内层圆筒反应室导电外壁接触。电极填料填充在四个填料室内，污水经由贯流式转轮进入装置内，贯流式转轮带动圆筒反应室整体旋转；在两个电极上接通电源施加电流，转动的内层反应器交替作为阴极和阳极反应室；为保证各个反应器之间的导通，反应室内侧绝缘孔板开有小孔，保证污水能够自由流通各个反应室。
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| GB/T 7714 | 李钒 , 何瑜庥 , 侯海元 et al. 一种可交换阴阳极反应室及搅拌电极填料的污水处理装置 : CN202210693855.1[P]. | 2022-06-19 . |
| MLA | 李钒 et al. "一种可交换阴阳极反应室及搅拌电极填料的污水处理装置" : CN202210693855.1. | 2022-06-19 . |
| APA | 李钒 , 何瑜庥 , 侯海元 , 许林成 . 一种可交换阴阳极反应室及搅拌电极填料的污水处理装置 : CN202210693855.1. | 2022-06-19 . |
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