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Your search keyword '"Ma, Jiangping"' showing total 120 results
Start Over Author "Ma, Jiangping" Publication Type Academic Journals
120 results on '"Ma, Jiangping"'

27. Identifying and eliminating false positives in thermal-assisted photocatalysis.

Author

Feng, Yajie, Lin, Chi, Ma, Jiangping, Ban, Chaogang, Zhao, Wenling, Tao, Xiaoping, Gan, Liyong, and Zhou, Xiaoyuan

Subjects
HYDROGEN production, PHOTOCATALYSIS, CALIBRATION
Abstract

We discovered that employing inappropriate calibration curves for activity evaluation resulted in false positive results. Specifically, an artificial efficiency of hydrogen production is exaggerated by up to 2.2-fold if the calibration curves are misused, leading to considerably high false positive results. Our study highlights the importance of utilizing the correct calibration curve to ensure a true performance, and is beneficial for fostering advancements in the development of thermal-assisted photocatalysis. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Double Bonuses Achieved in Single‐Atom Catalysts for Efficient Oxygen Evolution: Enhanced Reaction Kinetics and Reinforced Electrochemical Reconstruction.

Author

Liu, Xue, Jing, Shaojie, Wang, Kaiwen, Ban, Chaogang, Ding, Junjie, Feng, Yajie, Duan, Youyu, Ma, Jiangping, Yu, Danmei, Han, Xiaodong, Wang, Cong, Gan, Liyong, and Zhou, Xiaoyuan

Subjects
OXYGEN evolution reactions, CHEMICAL kinetics, CATALYSTS, HYDROGEN evolution reactions
Abstract

Single metal atoms decorated on earth‐abundant transition‐metal‐based supports have attracted intensive attention toward oxygen evolution reaction (OER) due to their decent activity and low cost. However, further optimizing the catalytic performance is severely plagued by the limited active sites. Conventional optimization relies primarily on increasing the metal loading but is extremely difficult. Thus, it is imperative to go beyond the current design paradigms. Herein, it is reported that the anchored highly active single metal atoms can reinforce the electrochemical reconstruction of the supports and thus yield more substrate active sites. Consequently, increased amount of active sites and enhanced intrinsic activity can be readily realized simultaneously. Taking Ni2P4O12 decorated with single Ir atoms as a typical example, an extraordinary activity of η10 = 186 mV and η100 = 238 mV and robust stability up to 108 h are achieved. Mechanistic study uncovers that the reinforced reconstruction of Ni2P4O12 originates from the promoted PO43− leaching by single Ir atoms, which is an intrinsic feature of the supports to achieve such reinforcement. The proposed concept, decorating single metal atoms on supports featured by facile anion leaching, opens a new avenue to the design of practical electrocatalysts for efficient OER. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Bismuth clusters pinned on TiO2 porous nanowires boosting charge transfer for CO2 photoreduction to CH4.

Author

Meng, Jiazhi, Wang, Kaiwen, Wang, Yang, Ma, Jiangping, Ban, Chaogang, Feng, Yajie, Zhang, Bin, Zhou, Kai, Gan, Liyong, Han, Guang, Yu, Danmei, and Zhou, Xiaoyuan

Subjects
CHARGE transfer, PHOTOREDUCTION, ARTIFICIAL photosynthesis, NANOWIRES, TIME-resolved spectroscopy, CHARGE carriers, PROTON transfer reactions
Abstract

Artificial photosynthesis in carbon dioxide (CO2) conversion into value-added chemicals attracts considerable attention but suffers from the low activity induced by sluggish separation of photogenerated carriers and the kinetic bottleneck-induced unsatisfied selectivity. Herein, we prepare a new-style Bi/TiO2 catalyst formed by pinning bismuth clusters on TiO2 nanowires through being confined by pores, which exhibits high activity and selectivity towards photocatalytic production of CH4 from CO2. Boosted charge transfer from TiO2 through Bi to the reactants is revealed via in situ X-ray photon spectroscopy and time-resolved photoluminescence (PL). Further, in situ Fourier transform infrared results confirm that Bi/TiO2 not only overcomes the multi-electron kinetics challenge of CO2 to CH4 via boosting charge transfer, but also facilitates proton production and transfer as well as the intermediates ⋆CHO and ⋆CH3O generation, ultimately achieving the tandem catalysis towards methanation. Theoretical calculation also underlies that the more favorable reaction step from ⋆CO to ⋆CHO on Bi/TiO2 results in CH4 production with higher selectivity. Our work brings new insights into rational design of photocatalysts with high performance and the formation mechanism of CO2 to CH4 for solar energy storage in future. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Proton doping enhanced flexoelectricity and photocurrent in hydrogen-charged TiO2.

Author

Wang, Z. L., Jin, Yangshi, Suen, Chun Hung, Mao, Chenyue, Gong, Xiangnan, Ma, Jiangping, Hong, J. W., Zhang, F., Wong, Chi-Ho, Chen, W. P., Zhou, X. Y., and Dai, Ji-Yan

Subjects
PROTONS, FLEXOELECTRICITY, STRAINS & stresses (Mechanics), PROTON conductivity, DIELECTRIC materials, SINGLE crystals, ENERGY conversion, CHARGE carriers, PHOTOCATHODES
Abstract

The intrinsic flexoelectric effect observed in oxide materials often falls below the desired threshold for practical applications. In this work, we demonstrate proton doping in insulating rutile TiO2 crystal as an effective approach to significantly increase flexoelectricity by more than two orders of magnitude. We attribute the noteworthy enhancement of flexoelectricity to the dual impact of proton doping in oxide materials. First, proton doping serves to induce the presence of charge carriers, resulting in the generation of flexoelectric currents. Second, proton doping induces expansion and distortion of the lattice structure, leading to an amplified flexoelectric field when the crystal experiences a strain gradient. The formation of O–H bonding in TiO2 crystal provides another route to break centrosymmetry according to lattice distortion of the TiO2 lattice, resulting in a larger flexoelectric field. In addition, the introduction of proton doping in TiO2 single crystals leads to a substantial increase in photocurrent by effectively flattening the interfacial Schottky junction. This phenomenon results in a three-order of magnitude enhancement of the photocurrent. Our work broadens the horizon of study on dielectric materials through proton doping and may also provide an approach that enables the utilization of dielectric materials in energy conversion applications. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Origin of Bismuth‐Rich Strategy in Bismuth Oxyhalide Photocatalysts.

Author

Wang, Yang, Meng, Jiazhi, Jing, Shaojie, Wang, Kaiwen, Ban, Chaogang, Feng, Yajie, Duan, Youyu, Ma, Jiangping, Gan, Liyong, and Zhou, Xiaoyuan

Subjects
BISMUTH, PHOTOCATALYSTS, VISIBLE spectra, ELECTRIC fields, PHOTOREDUCTION
Abstract

Recently, the bismuth‐rich strategy via increasing the bismuth content has been becoming one of the most appealing approaches to improve the photocatalytic performance of bismuth oxyhalides. However, insights into the mechanism behind the encouraging experiments are missing. Herein, we report the results of the theory‐led comprehensive picture of bismuth‐rich strategy in bismuth oxyhalide photocatalysts, selecting Bi5O7X (X = F, Cl, Br, I) as a prototype. First‐principle calculations revealed that the strategy enables good n‐type conductivity, large intrinsic internal electric field, high photoreduction ability and outstanding harvest of visible light, and particularly ranked the intrinsic activity of this family: Bi5O7F > Bi5O7I > Bi5O7Br > Bi5O7Cl. Designed experiments confirmed the theoretical predictions, and together, these results are expected to aid future development of advanced photocatalysts. [ABSTRACT FROM AUTHOR]

Published
2023
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