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432 results on '"Ke, Xiaoxing"'

54. Mesoporous Single‐Crystal Lithium Titanate Enabling Fast‐Charging Li‐Ion Batteries (Adv. Mater. 18/2022)

Author

Jin, Xu, primary, Han, Yehu, additional, Zhang, Zhengfeng, additional, Chen, Yawei, additional, Li, Jianming, additional, Yang, Tingting, additional, Wang, Xiaoqi, additional, Li, Wanxia, additional, Han, Xiao, additional, Wang, Zelin, additional, Liu, Xiaodan, additional, Jiao, Hang, additional, Ke, Xiaoxing, additional, Sui, Manling, additional, Cao, Ruiguo, additional, Zhang, Genqiang, additional, Tang, Yongfu, additional, Yan, Pengfei, additional, and Jiao, Shuhong, additional

Published
2022
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66. Iridium single-atom catalyst coupled with lattice oxygen activated CoNiO2 for accelerating the oxygen evolution reaction.

Author

Yang, Meng-Qi, Zhou, Kai-Ling, Wang, Chao, Zhang, Man-Chen, Wang, Chang-Hao, Ke, Xiaoxing, Chen, Ge, Wang, Hao, and Wang, Ru-Zhi

Abstract

Iridium (Ir) single-atom catalysts (SACs) exhibit extraordinary advantages in the oxygen evolution reaction (OER) owing to their unique electronic structure and maximized atom utilization. However, further developments have met with bottlenecks due to the limited catalytic activity derived from the widely adopted adsorbate evolution mechanism (AEM) pathway in Ir SACs for OER. Herein, we report an efficient strategy to improve the intrinsic activity of Ir SACs by anchoring atomic Ir on an oxygen vacancy-modified CoNiO2 support (IrSA-VO-CoNiO2), in which a more advanced lattice oxygen oxidation (LOM) pathway is constructed by activating lattice oxygen to participate in OER. Specifically, the synthesized CoNiO2 support could provide the weak metal–oxygen bond and facilitate the movement and conversion of lattice oxygen. The oxygen vacancies provided abundant active sites for the adsorption of OH* and induced a substantial O 2p characteristic near the Fermi level for activating the lattice oxygen in CoNiO2. Moreover, the introduction of Ir atoms in the oxygen vacancies modulated CoNiO2 results in the significant overlap between the Ir 5d and O 2p bands and constructed a stronger Ir–O covalent bond, which extremely facilitated the transformation from O–O to OO* for boosting the final O2 evolution. Through the above-mentioned results, a more efficient LOM pathway in the single-atom Ir catalyst was constructed, and the as-synthesized IrSA-VO-CoNiO2 displayed outstanding OER performance with 10 mA cm−2 at a low overpotential of 183 mV and a high mass activity of 5 A mg−1 at the overpotential of 300 mV, significantly outperforming the reported catalysts. This work proposes an advanced channel to design efficient electrocatalysts for promising OER applications. [ABSTRACT FROM AUTHOR]

Published
2022
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72. Optimized MoP with Pseudo-Single-Atom Tungsten for Efficient Hydrogen Electrocatalysis

Author

Chen, Changli, primary, Luo, Wenjia, additional, Li, Haijing, additional, Hu, Tao, additional, Zhao, Yizhou, additional, Zhao, Zipeng, additional, Sun, Xiaolong, additional, Zai, Huachao, additional, Qi, Yifei, additional, Wu, Menghao, additional, Dong, Yuanyuan, additional, Dong, Juncai, additional, Chen, Wenxing, additional, Ke, Xiaoxing, additional, Sui, Manling, additional, Zhang, Liqiang, additional, Chen, Qi, additional, Wang, Ziyu, additional, Zhu, Enbo, additional, Li, Yujing, additional, and Huang, Yu, additional

Published
2021
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74. Excellent energy storage and discharge performances in Na1/2Bi1/2TiO3-based ergodic relaxors by enlarging the [AO12] cages.

Author

Li, Miaomiao, Zhu, Mankang, Zheng, Mupeng, Hou, Yudong, Wang, Jitong, Chao, Xiaolian, Yang, Zupei, Zhou, Jinling, Wang, Ke, and Ke, Xiaoxing

Abstract

In this work, a lead-free 0.86(0.93Na1/2Bi1/2TiO3-0.07BaTiO3)-0.14K1/2Bi1/2(Zn1/3Nb2/3)O3 (KBZN14) ergodic relaxor demonstrates excellent energy storage performance: Ws = 6.48 J cm−3, Wr = 5.10 J cm−3, and η = 80% at a moderate field of 29.0 kV mm−1, accompanied by an outstanding frequency and temperature stability as well as a fast discharge rate t0.9 of 69–79 ns. The excellent energy storage performance of the sample KBZN14 originates from the synergic effect of KBZN introduction: the enlargement of the [AO12] cages of the pseudocubic perovskite host to facilitate the local polarization, and the complex cations (Zn1/3Nb2/3)4+ destroy the long-range correlations to percolate the polar nanoregions (PNRs) to room temperature. Our work provides a way to design NBT-based materials as a candidate for high energy density and pulse capacitor applications. [ABSTRACT FROM AUTHOR]

Published
2022
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79. Moiré Fringe Method via Scanning Transmission Electron Microscopy.

Author

Ke, Xiaoxing, Zhang, Manchen, Zhao, Kangning, and Su, Dong

Subjects
*SCANNING transmission electron microscopy, *ELECTRON energy loss spectroscopy, *ENERGY dispersive X-ray spectroscopy, *ATOMIC beams, *MATERIALS science, *GEOMETRIC quantum phases, *ATOMIC structure
Abstract

Moiré fringe, originated from the beating of two sets of lattices, is a commonly observed phenomenon in physics, optics, and materials science. Recently, a new method of creating moiré fringe via scanning transmission electron microscopy (STEM) has been developed to image materials' structures at a large field of view. Moreover, this method shows great advantages in studying atomic structures of beam sensitive materials by significantly reduced electron dose. Here, the development of the STEM moiré fringe (STEM‐MF) method is reviewed. The authors first introduce the theory of STEM‐MF and then discuss the advances of this technique in combination with geometric phase analysis, annular bright field imaging, energy dispersive X‐ray spectroscopy, and electron energy loss spectroscopy. Applications of STEM‐MF on strain, defects, 2D materials, and beam‐sensitive materials are further summarized. Finally, the authors′ perspectives on the future directions of STEM‐MF are presented. [ABSTRACT FROM AUTHOR]

Published
2022
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81. Engineering Platinum Catalysts viaa Site-Isolation Strategy with Enhanced Chlorine Resistance for the Elimination of Multicomponent VOCs

Author

Gao, Ruyi, Zhang, Manchen, Liu, Yuxi, Xie, Shaohua, Deng, Jiguang, Ke, Xiaoxing, Jing, Lin, Hou, Zhiquan, Zhang, Xing, Liu, Fudong, and Dai, Hongxing

Abstract

Pt-based catalysts can be poisoned by the chlorine formed during the oxidation of multicomponent volatile organic compounds (VOCs) containing chlorinated VOCs. Improving the low-temperature chlorine resistance of catalysts is important for industrial applications, although it is yet challenging. We hereby demonstrate the essential catalytic roles of a bifunctional catalyst with an atomic-scale metal/oxide interface constructed by an intermetallic compound nanocrystal. Introducing trichloroethylene (TCE) exhibits a less negative effect on the catalytic activity of the bimetallic catalyst for o-xylene oxidation, and the partial deactivation caused by TCE addition is reversible, suggesting that the bimetallic, HCl-etched Pt3Sn(E)/CeO2catalyst possesses much stronger chlorine resistance than the conventional Pt/CeO2catalyst. On the site-isolated Pt–Sn catalyst, the presence of aromatic hydrocarbon significantly inhibits the adsorption strength of TCE, resulting in excellent catalytic stability in the oxidation of the VOC mixture. Furthermore, the large amount of surface-adsorbed oxygen species generated on the electronegative Pt is highly effective for low-temperature C–Cl bond dissociation. The adjacent promoter (Sn–O) possesses the functionality of acid sites to provide sufficient protons for HCl formation over the bifunctional catalyst, which is considered critical to maintaining the reactivity of Pt by removing Cl and decreasing the polychlorinated byproducts.

Published
2022
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84. Carrier transport composites with suppressed glass-transition for stable planar perovskite solar cells

Author

Wang, Ligang, primary, Zhou, Huanping, additional, Li, Nengxu, additional, Zhang, Yu, additional, Chen, Lihaokun, additional, Ke, Xiaoxing, additional, Chen, Zhenxin, additional, Wang, Zelin, additional, Sui, Manling, additional, Chen, Yihua, additional, Huang, Yuan, additional, Li, Liang, additional, Xu, Ziqi, additional, Chen, Qi, additional, Sun, Ling-Dong, additional, and Yan, Chun-Hua, additional

Published
2020
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87. Anomalous Anisotropy in Superconducting Nanodiamond Films Induced by Crystallite Geometry

Author

Zhang, Gufei, primary, Kačmarčík, Jozef, additional, Wang, Zelin, additional, Zulkharnay, Ramiz, additional, Marcin, Miroslav, additional, Ke, Xiaoxing, additional, Chiriaev, Serguei, additional, Adashkevich, Vadzim, additional, Szabó, Pavol, additional, Li, Yejun, additional, Samuely, Peter, additional, Moshchalkov, Victor V., additional, May, Paul W., additional, and Rubahn, Horst-Günter, additional

Published
2019
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88. Tungsten as “Adhesive” in Pt 2 CuW 0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Author

Tu, Wenzhe, primary, Luo, Wenjia, additional, Chen, Changli, additional, Chen, Kai, additional, Zhu, Enbo, additional, Zhao, Zipeng, additional, Wang, Zelin, additional, Hu, Tao, additional, Zai, Huachao, additional, Ke, Xiaoxing, additional, Sui, Manling, additional, Chen, Pengwan, additional, Zhang, Qingshan, additional, Chen, Qi, additional, Li, Yujing, additional, and Huang, Yu, additional

Published
2019
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91. Advanced TEM Characterization for Single-atom Catalysts: from Ex-situTowards In-situ

Author

Wang, Guowei, Ke, Xiaoxing, and Sui, Manling

Abstract

Clean energy innovation has triggered the development of single-atom catalysts(SACs) due to their excellent catalytic activity, high tunability and low cost. The success of SACs for many catalytic reactions has opened a new field where the fundamentals of catalytic property-structure relationship at atomic level await exploration, and thus raises challenges for structural characterization. Among the characterization techniques for SACs, aberration-corrected transmission electron microscopy(TEM) has become an essential tool for direct visualization of single atoms. In this review, we briefly summarize recent studies on SACs using advanced TEM. We first introduce TEM methods, which are particularly important for SACs characterization, and then discuss the applications of advanced TEM for SAC characterization, where not only atomic dispersion of single atoms can be studied, but also the distribution of elements and the valence state with local coordination can be resolved. We further extend our review towards in-situTEM, which has increasing importance for the fundamental understanding of catalytic mechanism. Perspectives of TEM for SACs are finally discussed.

Published
2022
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96. Origin of the near-room temperature resistance transition in lutetium with H2/N2gas mixture under high pressure

Author

Peng, Di, Zeng, Qiaoshi, Lan, Fujun, Xing, Zhenfang, Zeng, Zhidan, Ke, Xiaoxing, Ding, Yang, and Mao, Ho-kwang

Abstract

The recent report of room-temperature superconductivity at near-ambient pressure in nitrogen-doped lutetium hydride (Lu-H-N) by Dasenbrock-Gammon et al.[Nature615, 244–250 (2023)] has attracted tremendous attention due to its anticipated great impact on technology. However, the results could not be independently reproduced by other groups worldwide in follow-up studies, which elicited intense controversy. Here, we develop a reliable experimental protocol to minimize the extensively concerned extrinsic influences on the sample by starting the reaction from pure lutetium loaded with an H2/N2gas mixture in a diamond anvil cell under different pressures and temperatures and simultaneously monitoring the entire chemical reaction process using in situfour-probe resistance measurements. Therefore, we could repeatedly reproduce the near-room temperature upsurge of electrical resistance at a relatively early stage of the chemical reaction. However, the mechanism is suggested to be a metal-to-semiconductor/insulator transition associated with the structural modulation in the non-stoichiometric Lu-H-N, rather than superconductivity.The near-room temperature resistance transition in the Lu-H-N compound is repeatedly reproduced, which is clarified to originate from a metal-to-semiconductor/insulator transition rather than superconductivity.

Published
2024
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98. Over 7% Efficiency of Sb2(S,Se)3 Solar Cells via V‐Shaped Bandgap Engineering.

Author

Li, Kanghua, Lu, Yue, Ke, Xiaoxing, Li, Sen, Lu, Shuaicheng, Wang, Chong, Wang, Siyu, Chen, Chao, and Tang, Jiang

Subjects
SOLAR cells, SILICON solar cells, VAPOR-plating, OPEN-circuit voltage, SHORT-circuit currents, ENGINEERING, COPPER films, COPPER-zinc alloys
Abstract

Antimony chalcogenides (including Sb2S3, Sb2Se3, and Sb2(S,Se)3 alloy) have emerged as promising solar absorber materials. Notably, the Sb2(S,Se)3 alloy possesses continuously tunable bandgap from 1.1 to 1.7 eV, which covers the ideal bandgap for single‐junction photovoltaics governed by the Shockley–Queisser theory. Moreover, the bandgap gradient provides effective ways for photogenerated carriers collection and has the potential for high‐efficient Sb2(S,Se)3 alloy solar cells. Herein, a V‐shaped distributional bandgap in Sb2(S,Se)3 solar cells is reported through a simple dual‐source vapor transport deposition process, enabling the synergetic increase of the open‐circuit voltage (VOC) and short‐circuit current (JSC). Through careful optimization, a power conversion efficiency of 7.27% under AM1.5G illumination is obtained, with VOC and JSC of 0.46 V and 29.6 mA cm−2, respectively. This V‐shaped bandgap engineering provides an effective method to enhance the device performance and can be extended to other chalcogenide thin‐film solar cells such as Sn–X, Ge–X, Cu–Sb–X (X = S and Se), and so on. [ABSTRACT FROM AUTHOR]

Published
2020
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100. Tungsten as "Adhesive" in Pt2CuW0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis.

Author

Tu, Wenzhe, Luo, Wenjia, Chen, Changli, Chen, Kai, Zhu, Enbo, Zhao, Zipeng, Wang, Zelin, Hu, Tao, Zai, Huachao, Ke, Xiaoxing, Sui, Manling, Chen, Pengwan, Zhang, Qingshan, Chen, Qi, Li, Yujing, and Huang, Yu

Subjects
TERNARY alloys, OXYGEN reduction, TUNGSTEN, ELECTROCATALYSIS, CHEMICAL stability, SURFACE energy, STANDARD hydrogen electrode
Abstract

Pt‐based alloy nanocrystals have shown great success in oxygen reduction electrocatalysis owing to their unique surface and electronic structures. However, they suffer from severe stability issues due to the dissolution of non‐noble metal elements, leading to the "trade‐off" between activity and stability. In this work, targeting the stability issue of a PtxCuy‐based alloy, Pt2CuW0.25 ternary alloy nanoparticles are synthesized by thermal reduction strategy based on wet‐chemical method using W(CO)6 as a reductant. Apart from the competitive activity, the obtained Pt2CuW0.25/C shows remarkable stability, whereby the area specific activity and mass activity maintain 89.5% and 95.9% of the initial values, respectively, after 30 000 cycles of accelerated polarization between 0.6 and 1.1 V (vs reversible hydrogen electrode). By using vacancy formation energy of surface Pt as the descriptor, it is found that the enhanced stability of Pt2CuW0.25/C originates mainly from the stronger bonding between W and Pt/Cu atoms, acting as an "adhesive" to stabilize the atoms from dissolution, which is further verified by chemical stability experiments. This work demonstrates a rational design strategy for ternary alloy nano‐electrocatalyst that has high thermodynamic stability while maintaining high activity by employing high‐melting‐point metal. [ABSTRACT FROM AUTHOR]

Published
2020
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