期刊：
Journal of Materials Chemistry A,2022年10(3):1086-1104 ISSN：2050-7488
通讯作者：
Yu, Y.;Qiu, M.
作者机构：
[Peng, Bowen; Shuai, Zeyu; Qiu, Ming; Yu, Ying] Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China;Mwalimu Julius K. Nyerere University of Agriculture and Technology, P. O Box 976, Musoma, Tanzania;[Masana, Jofrey J.] Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China<&wdkj&>Mwalimu Julius K. Nyerere University of Agriculture and Technology, P. O Box 976, Musoma, Tanzania
通讯机构：
[Ming Qiu; Ying Yu] I;Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
期刊：
Journal of Materials Chemistry A,2022年10(34):17552-17560 ISSN：2050-7488
通讯作者：
Yu, Y.;Yu, J.C.;Qiu, M.;Wang, Y.
作者机构：
[Zhang, Zhongshuo; Yu, Jimmy C.; Wang, Ying; Yu, Luo] Chinese Univ Hong Kong, Dept Chem, Hong Kong 999077, Peoples R China.;[Huang, Chuqiang; Xiao, Jiayong; Yu, Ying; Qiu, Ming] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Ming Qiu; Ying Yu] C;[Ying Wang; Jimmy C. Yu] D;Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR 999077, China<&wdkj&>College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
作者机构：
[Zhao, Danyang; Yu, Ying; Zhou, Qiancheng] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Zhu, Qiancheng; Zhang, Wenming] Hebei Univ, Coll Phys Sci & Technol, Natl & Local Joint Engn Lab New Energy Photoelect, Baoding 071002, Peoples R China.;[Chen, Shuo; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Chen, Shuo; Ren, Zhifeng] Univ Houston, TcSUH, Houston, TX 77204 USA.
通讯机构：
[Ying Yu] I;[Shuo Chen; Zhifeng Ren] D;Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, 430079 China<&wdkj&>Department of Physics and TcSUH, University of Houston, Houston, Texas, 77204 USA
摘要：
“Starch turns blue when it encounters iodine” is a classic chemical reaction, which results from the unique structure of the helix starch molecule–iodine complex. Inspired by this, the I0/I− conversion efficiency of an I2‐Zn battery is clearly enhanced by starch confinement. The redox couple of I0/I− in aqueous rechargeable iodine–zinc (I2‐Zn) batteries is a promising energy storage resource since it is safe and cost‐effective, and provides steady output voltage. However, the cycle life and efficiency of these batteries remain unsatisfactory due to the uncontrolled shuttling of polyiodide (I3− and I5−) and side reactions on the Zn anode. Starch is a very low‐cost and widely sourced food used daily around the world. “Starch turns blue when it encounters iodine” is a classic chemical reaction, which results from the unique structure of the helix starch molecule–iodine complex. Inspired by this, we employ starch to confine the shuttling of polyiodide, and thus, the I0/I− conversion efficiency of an I2‐Zn battery is clearly enhanced. According to the detailed characterizations and theoretical DFT calculation results, the enhancement of I0/I− conversion efficiency is mainly originated from the strong bonding between the charged products of I3− and I5− and the rich hydroxyl groups in starch. This work provides inspiration for the rational design of high‐performance and low‐cost I2‐Zn in AZIBs.
作者机构：
[Peng, Bowen; Liu, Jin; Wang, Zhouzhou; Huang, Chuqiang; Yu, Ying; Zhou, Qiancheng; Duan, Dingshuo] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Li, Liping] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China.;[Yu, Jiaguo] China Univ Geosci, Fac Mat Sci & Chem, Lab Solar Fuel, Wuhan 430079, Peoples R China.;[Yu, Luo] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong 999077, Peoples R China.;[Zhang, Wei] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.
通讯机构：
[Liping Li] S;[Jiaguo Yu] L;[Ying Yu] I;Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, China<&wdkj&>Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, China<&wdkj&>State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
摘要：
Among various studied catalysts, copper-based electrocatalysts can convert CO2 into hydrocarbons. Two main challenges in this research area are low selectivity, especially for value-added C2+ products and the high overpotentials required to initiate carbon dioxide reduction reaction (CO2RR). The interaction between copper and oxygen has always been inevitable in the design of copper-based catalysts owing to the intrinsic activity of copper and the oxygen-rich environment we live in. Recently, due to the unprecedented development of in-situ characterization, continuously increasing attention has been paid to oxygen species, which is usually accounting for the highest proportion of metalloid composition in copper-based catalysts. Herein, we have summarized the research progress on oxygen-containing copper catalysts, both experimentally and theoretically, and revealed the evolution of oxygen and the relationship between catalytic performance and oxygen species. It is found that the existence of subsurface oxygen in the electrochemical interface of copper-based electrodes has been proved both by in-situ characterization and theoretical simulation, which is also essential for efficient CO2RR to C2+ products. Additionally, selectivity to C2+ products is basically boosted in three ways: facilitating the conversion of CO2 from physical adsorption to chemical adsorption, strengthening intermediate binding and optimizing the adsorption configuration of CO2. It is expected that this review will provide clue for utilizing oxygen to enhance C2+ selectivity in the design of copper-based catalysts. (c) 2021 Elsevier Ltd. All rights reserved.
通讯机构：
[Y. Yu] I;[S. Chen] D;Department of Physics and TcSUH, University of Houston, Houston, TX, 77204, USA<&wdkj&>Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, China
摘要：
Rechargeable aqueous Zn-based batteries are highly desirable for future applications in large-scale energy storage since they are inexpensive and safe in comparison with lithium-ion batteries (LIBs). Additionally, the high energy density of Zn batteries, nearly comparable to that of LIBs, stands out in all types of aqueous batteries. Fast charge, extremely important in practical application, is another typical characteristic in aqueous batteries compared to LIBs with organic electrolyte, but little attention has been paid to it thus far. Herein, ultrafast charge of the cathodes in Zn batteries are realized through the rapid conversion of low-valence transition-metal ions to their high-valence solid oxides using a simple high potential deposition strategy. In particular, the Mn-based cathode exhibits a charge time that is only around 1/40 of that by traditional constant-current charge method, while high capacity is acquired simultaneously due to the multivalent conversion. (C) 2021 Elsevier Ltd. All rights reserved.
摘要：
Compared to single metal–organic framework (MOF), core–shell MOF crystals are more promising due to their special structure and unique properties. Herein, since ZIF-8 and ZIF-67 have the same topology, crystal growth method is used to synthesize core–shell crystals ZIF-8@ZIF-67, which exhibit far superior light adsorption, charge separation capabilities, and excellent stability than ZIF-8 and ZIF-67. The photocatalytic H2 generation rate for ZIF-8@ZIF-67 (1:1) is about 17 times higher than that of pure ZIF-67 without cocatalyst loading under same reaction conditions. Through a series of characterizations, two connection modes between ZIF-8 and ZIF-67 frames in core–shell contact interface are proposed, and the corresponding photocatalytic mechanism is elucidated. Transient photovoltaic curve reveals the unique transfer paths of electrons through contact interface, which leads to efficient charge separation compared with other ZIF materials. This study provides a novel and simple strategy to synthesis high effective and stable core–shell ZIF photocatalyst for photodegradation and hydrogen evolution.
关键词：
Radio bursts;Radio transient sources;Neutron stars;Magnetars;X-ray transient sources;Non-thermal radiation sources
摘要：
The nature of fast radio bursts (FRBs) is currently unknown. Repeating FRBs offer better observation opportunities than nonrepeating FRBs because their simultaneous multiwavelength counterparts might be identified. The magnetar flare model of FRBs is one of the most promising models that predict high-energy emission in addition to radio burst emission. To investigate such a possibility, we have searched for simultaneous and quasi-simultaneous short-term hard X-ray bursts in all Swift/BAT event mode data, which covered the periods when FRB detections were reported in the repeating FRB 121102, by making use of BAT's arcminute-level spatial resolution and wide field of view. We did not find any significant hard X-ray bursts that occurred simultaneously with those radio bursts. We also investigated potential short X-ray bursts that occurred quasi-simultaneously with those radio bursts (occurrence time differs in the range from hundreds of seconds to thousands of seconds) and concluded that even the best candidates are consistent with background fluctuations. Therefore, our investigation concluded that there were no hard X-ray bursts detectable with Swift/BAT that occurred simultaneously or quasi-simultaneously with those FRBs in the repeating FRB 121102.
摘要：
NiFe layered double hydroxide (NiFe-LDH) nanosheets and metal-nitrogen-carbon materials (M-N-C, M = Ni, Fe, Co, etc.) are supreme catalysts in the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) process, respectively. Nevertheless, the monotonic performance and insufficient stability severely hamper their practical application in rechargeable batteries. Herein, we simultaneously combine ultrathin NiFe-LDH nanowalls with renewable soybean-derived Fe-N-C matrix to obtain a hybrid materials (NiFe-LDH/FeSoy-CNSs-A), which exhibits robust catalytic activities for OER (Ej=10 = 1.53 V vs. RHE) and ORR (E1/2 = 0.91 V vs. RHE), with a top-notch battery parameters and stability in assembled rechargeable Zn-air batteries. Intensive investigations indicate that the vertically dispersed NiFe-LDH nanosheets, Fe-N-C matrix derived from soybean and the strong synergy between them are responsible for the unprecedented OER and ORR performances. The key role of intrinsic N defects involved in the hybrid materials is firstly specified by ultrasoundassisted extraction of soy protein from soybean. The exquisite design can facilitate the utilization of sustainable biomass-derived catalysts, and the mechanism investigations of N defects and oxygenic groups on the structure-activity relationship can stimulate the progress of other functional hybrid electrocatalysts.
摘要：
Morphology is a key parameter in the design of novel nanocrystals with desired functional properties. Here we report our findings in controlling or tuning the morphology of TiO2 nanorod bundles using neodymium ions (Nd3+) in order to dramatically enhance Li ion transport during the lithiation process. We have revealed the underlying growth mechanism by tracking the evolution of the TiO2 nanocrystals during the growth process. By carefully controlling experimental conditions, we have successfully directed the growth of TiO2 nanocrystal along the [001] direction. When tested in a Li-ion battery, the obtained TiO2 nanorod bundles display superior electrochemical performance, demonstrating high capacity (305 mA h/g at 0.1 A/g) and excellent cycling stability (only 1.6% capacity fading per 100 cycles over 800 cycles). The approach may be applicable to the fabrication of other metal oxides with a broad range of compositions and properties.
期刊：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2020年142(26):11417-11427 ISSN：0002-7863
通讯作者：
Qiu, Ming;Yu, Ying;Ren, Zhifeng
作者机构：
[Xiao, Qin; Huang, Chuqiang; Zhang, Wei; Yu, Ying; Yu, Luo; Shuai, Ling; Qiu, Ming] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Luo; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo; Ren, Zhifeng] Univ Houston, Texas Ctr Superconduct, Univ Houston TcSUH, Houston, TX 77204 USA.;[Zhang, Jing; An, Pengfei] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China.
通讯机构：
[Qiu, M; Yu, Y] C;[Ren, Zhifeng] U;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, Texas Ctr Superconduct, Univ Houston TcSUH, Houston, TX 77204 USA.
摘要：
Oxygen-bearing copper (OBC) has been widely studied for enabling the C-C coupling of the electrocatalytic CO(2) reduction reaction (CO(2)RR) since this is a distinctive hallmark of strongly correlated OBC systems and may benefit many other Cu-based catalytic processes. Unresolved problems, however, include the instability of and limited knowledge regarding OBC under realistic operating conditions, raising doubts about its role in CO(2)RR. Here, an atypical and stable OBC catalyst with a hierarchical pore and nanograin-boundary structure was constructed and was found to exhibit efficient CO(2)RR for the production of ethylene with a Faradaic efficiency of 45% at a partial current density of 44.7 mA cm(-2) in neutral media, and the ethylene partial current density is nearly 26 and 116 times that of oxygen-free copper (OFC) and commercial Cu foam, respectively. More importantly, the structure-activity relationship in CO(2)RR was explored through a comprehensive analysis of experimental data and computational techniques, thus increasing the fundamental understanding of CO(2)RR. A systematic characterization analysis suggests that atypical OBC (Cu(4)O) was formed and that it is stable even at -1.00 V [(vs the reversible hydrogen electrode (RHE)]. Density functional theory calculations show that the atypical OBC enables control over CO adsorption and dimerization, making it possible to implement a preference for the electrosynthesis of ethylene (C(2)) products. These results provide insight into the synthesis and structural characteristics of OBC as well as its interplay with ethylene selectivity.
