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194 results on '"Chen, Ruotian"'

13. Bioinspired carbon nanotube–based nanofluidic ionic transistor with ultrahigh switching capabilities for logic circuits

Author

Liu, Wenchao, primary, Mei, Tingting, additional, Cao, Zhouwen, additional, Li, Chun, additional, Wu, Yitian, additional, Wang, Li, additional, Xu, Guoheng, additional, Chen, Yuanxia, additional, Zhou, You, additional, Wang, Senyao, additional, Xue, Yahui, additional, Yu, Yanhao, additional, Kong, Xiang-Yu, additional, Chen, Ruotian, additional, Tu, Bin, additional, and Xiao, Kai, additional

Published
2024
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22. Visualizing the role of applied voltage in non-metal electrocatalysts.

Author

Wang, Ziyuan, Chen, Jun, Ni, Chenwei, Nie, Wei, Li, Dongfeng, Ta, Na, Zhang, Deyun, Sun, Yimeng, Sun, Fusai, Li, Qian, Li, Yuran, Chen, Ruotian, Bu, Tiankai, Fan, Fengtao, and Li, Can

Subjects
ELECTRIC double layer, KELVIN probe force microscopy, HYDROGEN evolution reactions, ELECTROCATALYSTS, CHARGE exchange, VOLTAGE
Abstract

Understanding how applied voltage drives the electrocatalytic reaction at the nanoscale is a fundamental scientific problem, particularly in non-metallic electrocatalysts, due to their low intrinsic carrier concentration. Herein, using monolayer molybdenum disulfide (MoS2) as a model system of non-metallic catalyst, the potential drops across the basal plane of MoS2 (ΔVsem) and the electric double layer (ΔVedl) are decoupled quantitatively as a function of applied voltage through in-situ surface potential microscopy. We visualize the evolution of the band structure under liquid conditions and clarify the process of EF keeping moving deep into Ec, revealing the formation process of the electrolyte gating effect. Additionally, electron transfer (ET) imaging reveals that the basal plane exhibits high ET activity, consistent with the results of surface potential measurements. The potential-dependent behavior of kf and ns in the ET reaction are further decoupled based on the measurements of ΔVsem and ΔVedl. Comparing the ET and hydrogen evolution reaction imaging results suggests that the low electrocatalytic activity of the basal plane is mainly due to the absence of active sites, rather than its electron transfer ability. This study fills an experimental gap in exploring driving forces for electrocatalysis at the nanoscale and addresses the long-standing issue of the inability to decouple charge transfer from catalytic processes. [ABSTRACT FROM AUTHOR]

Published
2023
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33. Tip-induced directional charge separation on one-dimensional BiVO4nanocones for asymmetric light absorption

Author

Yang, Nengcong, Chen, Ruotian, Ni, Chenwei, Li, Dongfeng, Sun, Qi, Liu, Lifang, Qi, Yu, Jin, Shengye, Wang, Xiuli, Fan, Fengtao, Li, Can, and Zhang, Fuxiang

Abstract

In this work, we use 1D BiVO4nanocones and nanorods as prototypes to study the influence of 1D symmetry on charge separation. The unexpected spatial charge separation on the asymmetric nanocones as a result of charge carrier diffusion for the asymmetric tip-enhanced light absorption.

Published
2022
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42. CoOx nanoparticle anchored on sulfonated-graphite as efficient water oxidation catalyst† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c7sc01756a Click here for additional data file

Author

Guan, Jingqi, Ding, Chunmei, Chen, Ruotian, Huang, Baokun, Zhang, Xianwen, Fan, Fengtao, Zhang, Fuxiang, and Li, Can

Subjects
Chemistry, integumentary system, fungi, food and beverages
Abstract

Ultrasmall CoOx nanoparticles on sulfonated graphite exhibit highly efficient water oxidation activity and can be used for electrochemical and solar water oxidation., Development of efficient, robust and earth-abundant water oxidation catalysts (WOCs) is extremely desirable for water splitting by electrolysis or photocatalysis. Herein, we report cobalt oxide nanoparticles anchored on the surface of sulfonated graphite (denoted as “CoOx@G-Ph-SN”) to exhibit unexpectedly efficient water oxidation activity with a turnover frequency (TOF) of 1.2 s–1; two or three orders of magnitude higher than most cobalt-based oxide WOCs reported so far. The CoOx@G-Ph-SN nanocomposite can be easily prepared by a soft hydrothermal route to have an average CoOx size below 2 nm. Additionally, the loading of CoOx@G-Ph-SN catalyst on the surface of a BiVO4 or Fe2O3 photoanode can boost remarkably the photoanode currents for robust photocatalytic water oxidation under visible light irradiation. Its excellent activity and photochemical stability for water oxidation suggest that this ultrasmall cobalt-based composite is a promising candidate for solar fuel production.

Published
2017

43. Light-driven directional ion transport for enhanced osmotic energy harvesting.

Author

Xiao, Kai, Giusto, Paolo, Chen, Fengxiang, Chen, Ruotian, Heil, Tobias, Cao, Shaowen, Chen, Lu, Fan, Fengtao, and Jiang, Lei

Subjects
ENERGY harvesting, TRANSPORT theory, MEMBRANE potential, BIOLOGICAL transport, PHOTOCURRENTS, OSMOTIC pressure
Abstract

Light-driven ion (proton) transport is a crucial process both for photosynthesis of green plants and solar energy harvesting of some archaea. Here, we describe use of a TiO2/C3N4 semiconductor heterojunction nanotube membrane to realize similar light-driven directional ion transport performance to that of biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, the TiO2/C3N4 heterojunction nanotube membrane can generate a photocurrent of about 9 μA/cm2, corresponding to a pumping stream of ∼5500 ions per second per nanotube. By changing the position of TiO2 and C3N4, a reverse equivalent ionic current can also be realized. Directional transport of photogenerated electrons and holes results in a transmembrane potential, which is the basis of the light-driven ion transport phenomenon. As a proof of concept, we also show that this system can be used for enhanced osmotic energy generation. The artificial light-driven ion transport system proposed here offers a further step forward on the roadmap for development of ionic photoelectric conversion and integration into other applications, for example water desalination. [ABSTRACT FROM AUTHOR]

Published
2021
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44. Probing of coupling effect induced plasmonic charge accumulation for water oxidation.

Author

Gao, Yuying, Cheng, Feng, Fang, Weina, Liu, Xiaoguo, Wang, Shengyang, Nie, Wei, Chen, Ruotian, Ye, Sheng, Zhu, Jian, An, Hongyu, Fan, Chunhai, Fan, Fengtao, and Li, Can

Subjects
OXIDATION of water, PHOTOCATALYSIS, KELVIN probe force microscopy, PHOTOCATALYTIC oxidation, SURFACE photovoltage, PHOTOCATALYSTS, GOLD nanoparticles
Abstract

A key issue for redox reactions in plasmon-induced photocatalysis, particularly for water oxidation, is the concentration of surface-accumulating charges (electrons or holes) at a reaction site for artificial photosynthesis. However, where plasmonic charge accumulated at a catalyst's surface, and how to improve local charge density at active sites, remains unknown because it is difficult to identify the exact spatial location and local density of the plasmon-induced charge, particularly with regard to holes. Herein, we show that at the single particle level, plasmon-coupling-induced holes can be greatly accumulated at the plasmonic Au nanoparticle dimer/TiO2 interface in the nanogap region, as directly evidenced by the locally enhanced surface photovoltage. Such an accumulation of plasmonic holes can significantly accelerate the water oxidation reaction (multi-holes involved) at the interfacial reaction site, with nearly one order of magnitude enhancement in photocatalytic activities compared to those of highly dispersed Au nanoparticles on TiO2. Combining Kelvin probe force microscopy and theoretical simulation, we further clarified that the local accumulated hole density is proportional to the square of the local near-field enhancement. Our findings advance the understanding of how charges spatially distribute in plasmonic systems and the specific role that local charge density at reaction sites plays in plasmonic photocatalysis. [ABSTRACT FROM AUTHOR]

Published
2021
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49. Reducing the surface defects of Ta3N5 photoanode towards enhanced photoelectrochemical water oxidation.

Author

Shao, Chenyi, Chen, Ruotian, Zhao, Yongle, Li, Zheng, Zong, Xu, and Li, Can

Abstract

Tuning the concentration and location of defects in semiconductors has been found to be effective in modifying their photoelectrochemical (PEC) performance. Herein, we present the fabrication of Ta3N5 photoanodes with reduced surface defects through the nitridation of a two-step-flame-heating-derived Ta2O5 precursor (TSFH-Ta2O5). We found that by using TSFH-Ta2O5 instead of the one-step-flame-heating-derived Ta2O5 (OSFH-Ta2O5), the concentrations of low valence Ta species on the surface of Ta2O5 and the resulting Ta3N5 photoelectrodes are reduced. Moreover, we clarified that low valence Ta species on the Ta3N5 surface led to the formation of undesirable surface states, which induces severe Fermi level pinning and aggravates charge recombination. Therefore, TSFH-Ta3N5 delivered enhanced charge separation and injection efficiencies for PEC water oxidation reaction. A photocurrent density of 6.8 mA cm−2 at 1.23 V vs. reversible hydrogen electrode (RHE) was obtained on TSFH-Ta3N5 after loading a Co(OH)x cocatalyst, which is among the highest values reported for planar Ta3N5 photoanodes. [ABSTRACT FROM AUTHOR]

Published
2020
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