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学者姓名：王立华
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摘要 ：
Polymeric carbon nitride (C3N4) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H2O2) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C3N4 nanosheets to form a homojunction structure (HJ-C3N4), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H2O2 yield of the HJ-C3N4 reached 115 mu mol L-1 h(-1) in pure water by visible light, which has an 8.6x higher production than g-C3N4 nanosheets. The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.
关键词 ：
Band alignment Band alignment Carbon nitride Carbon nitride H2O2 H2O2 Homojunction Homojunction Quantum dots Quantum dots
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| GB/T 7714 | Ma, Peijie , Zhang, Xu , Wang, Cong et al. Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 300 . |
| MLA | Ma, Peijie et al. "Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution" . | APPLIED CATALYSIS B-ENVIRONMENTAL 300 (2022) . |
| APA | Ma, Peijie , Zhang, Xu , Wang, Cong , Wang, Zhiwei , Wang, Kaiwen , Feng, Yibo et al. Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 300 . |
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摘要 ：
纳米Ir薄膜中缺陷结构的原子尺度研究
关键词 ：
缺陷 缺陷 多重孪晶 多重孪晶 面心立方 面心立方 位错 位错 原子尺度 原子尺度 孪晶界 孪晶界
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 韦如建 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 韦如建 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 韦如建 , 2021 , 40 (2) , 101-107 . |
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摘要 ：
金属铱(Ir)因具有高密度,高熔点,高硬度等特点而被广泛应用于航空航天、军工等高新科技领域.但Ir的塑性差,严重影响其进一步广泛应用.金属自身的结构及缺陷对其力学性能具有重要影响,研究Ir的原子尺度微观结构可为其力学性能优化提供重要参考.本文主要利用透射电子显微镜(TEM)对纳米Ir薄膜中的缺陷类型和缺陷密度进行了研究.发现薄膜中存在高密度的孪晶以及位错.其中,薄膜中的孪晶密度为1.6×103(1/μm2).此外,研究还发现薄膜中有两大类缺陷的相互作用:位错与孪晶相互作用以及孪晶与孪晶相互作用.前者包括层错与孪晶相互作用以及全位错对孪晶的钉扎作用;孪晶之间的相互作用形态包括头对头对接式,三重孪晶和五重孪晶等多种形态.
关键词 ：
位错 位错 多重孪晶 多重孪晶 原子尺度 原子尺度 面心立方 面心立方 孪晶界 孪晶界 缺陷 缺陷
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 电子显微学报 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 电子显微学报 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 电子显微学报 , 2021 , 40 (2) , 101-107 . |
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摘要 ：
为探究城市韧性恢复能力与空间形态特征的关系,选取长江中下游地区的20个城市作为研究对象,利用17个韧性评价指标和3个空间形态指标构建评价体系.通过因子分析提取6个韧性评价指标公共因子,利用FCM聚类算法将20个城市划分为4个等级,并分析不同等级城市的空间形态特征.研究发现:城市韧性恢复能力与空间形态特征之间存在相关关系;一级至四级韧性城市的紧凑度递减、形状分维数递增、信息熵相近.这说明城市构成要素的布局越紧凑,不同功能用地的规划越合理,韧性恢复能力越强;同时,城市韧性恢复能力越强,其避难场所、交通网络、生命线工程等设施的规划建设越合理,越能优化城市空间形态特征.
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| GB/T 7714 | 王丽华 , 马东辉 . 城市韧性恢复能力与空间形态特征相互关系研究 [J]. | 武汉理工大学学报（信息与管理工程版） , 2021 , 43 (3) : 197-202 . |
| MLA | 王丽华 et al. "城市韧性恢复能力与空间形态特征相互关系研究" . | 武汉理工大学学报（信息与管理工程版） 43 . 3 (2021) : 197-202 . |
| APA | 王丽华 , 马东辉 . 城市韧性恢复能力与空间形态特征相互关系研究 . | 武汉理工大学学报（信息与管理工程版） , 2021 , 43 (3) , 197-202 . |
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摘要 ：
本文利用原位实验技术,在透射电镜中对AuAg纳米晶薄膜裂纹扩展以及裂纹前端塑性机制进行了原位原子尺度观察。原位观察发现,在初期,裂纹在晶界处形核并沿着晶界扩展,在裂纹前端晶粒内部有形变孪晶的形核与长大。随着应变的增加,逐渐转为穿晶断裂,此时晶粒内的生长孪晶及变形孪晶均展现出良好的塑性变形能力。本实验对人们理解面心立方合金纳米晶材料的裂纹扩展机制具有一定借鉴意义。
关键词 ：
合金 合金 孪晶 孪晶 晶间裂纹 晶间裂纹 纳米晶薄膜 纳米晶薄膜 裂纹扩展 裂纹扩展 退孪晶 退孪晶
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| GB/T 7714 | 杨成鹏 , 符立波 , 郭谊忠 et al. AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察 [J]. | 电子显微学报 , 2021 , 40 (05) : 489-495 . |
| MLA | 杨成鹏 et al. "AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察" . | 电子显微学报 40 . 05 (2021) : 489-495 . |
| APA | 杨成鹏 , 符立波 , 郭谊忠 , 王立华 , 张泽 , 韩晓东 . AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察 . | 电子显微学报 , 2021 , 40 (05) , 489-495 . |
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摘要 ：
Detwinning is an important plastic deformation mechanism that can significantly affect the mechanical properties of twin-structured metals. Although many detwinning mechanisms have been proposed for pure metals, it is unclear whether such a deformation model is valid for nanocrystalline alloys because of the lack of direct evidence. Here, the atomic-scale detwinning deformation process of a nanocrystalline AuAg alloy with an average grain size of similar to 15 nm was investigated in situ. The results show that there are three types of detwinning mechanisms in nanocrystalline AuAg alloys. The first type of detwinning results from grain boundary migration. The second type of detwinning occurs through combined layer-by-layer thinning and incoherent twin boundary migration. The last one occurs through incoherent twin boundary migration, which results from the collective motion of partial dislocations in an array.
关键词 ：
atomic scale atomic scale detwinning detwinning in situ in situ transmission electron microscopy transmission electron microscopy twin-structured twin-structured
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| GB/T 7714 | Fu, Libo , Yang, Chengpeng , Lu, Yan et al. In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy [J]. | SCIENCE CHINA-MATERIALS , 2021 . |
| MLA | Fu, Libo et al. "In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy" . | SCIENCE CHINA-MATERIALS (2021) . |
| APA | Fu, Libo , Yang, Chengpeng , Lu, Yan , Teng, Jiao , Kong, Deli , Guo, Yizhong et al. In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy . | SCIENCE CHINA-MATERIALS , 2021 . |
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摘要 ：
Photocatalytic hydrogen production from water splitting has received considerable attention in recent years. The bottle-neck issue for hydrogen production efficiency is the relative slow charge separation and efficient hydrogen evolution. Currently, the major strategy for developing catalysts is to anchor small noble-metal cocatalysts onto relatively large photocatalysts. In this study, extremely small photocatalysts of TiO2 quantum dots were loaded onto the low-cost micro-sized cocatalysts of porous NiO/NiS2 nanosheets, promoting the rapid charge separation of photogenerated electrons from small-sized photocatalysts to large-sized cocatalysts. The size of cocatalysts is three orders of magnitude larger than that of photocatalysts. The hydrogen production of designed catalysts is similar to 16 times higher than that of pure TiO2 photocatalysts, clearly demonstrating the critical role of large-sized porous cocatalysts. Our game-changing strategy provides a distinctive approach to design new kinds of photocatalysts with rapid charge separation and highly efficient hydrogen evolution.
关键词 ：
Cocatalyst Cocatalyst Fast charge separation Fast charge separation Micro-sized porous nanosheet Micro-sized porous nanosheet Photocatalyst Photocatalyst Quantum dot Quantum dot
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| GB/T 7714 | Li, Yuanli , Gao, Chunlang , Jiang, Wenshuai et al. A game-changing design of low-cost, large-size porous cocatalysts decorated by ultra-small photocatalysts for highly efficient hydrogen evolution [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2021 , 286 . |
| MLA | Li, Yuanli et al. "A game-changing design of low-cost, large-size porous cocatalysts decorated by ultra-small photocatalysts for highly efficient hydrogen evolution" . | APPLIED CATALYSIS B-ENVIRONMENTAL 286 (2021) . |
| APA | Li, Yuanli , Gao, Chunlang , Jiang, Wenshuai , Zhuang, Chunqiang , Tan, Wuyuan , Li, Weiming et al. A game-changing design of low-cost, large-size porous cocatalysts decorated by ultra-small photocatalysts for highly efficient hydrogen evolution . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2021 , 286 . |
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摘要 ：
Body-centered-cubic (BCC) refractory high-entropy alloys (RHEAs) are being actively pursued due to their potential to outperform existing superalloys at elevated temperatures. One bottleneck problem, however, is that these RHEAs lack tensile ductility and, hence, processability at room temperature. The strategy previously invoked to sustain ductility in high-strength HEAs is to manage dislocation movements via incorporating dispersed obstacles; this, however, may also have embrittlement ramifications. Here, a new strategy is demonstrated to achieve ductile BCC HfNbTiV, via decomposing the BCC arrangement (β phase) into a β(BCC1) + β∗(BCC2) arrangement via spinodal decomposition, producing chemical composition modulations and, more importantly, elastic strain on a length scale of a few tens of nanometers. The periodically spaced β∗, with large lattice distortion, is particularly potent in heightening the ruggedness of the terrain for the passage of dislocations. This makes the motion of dislocations sluggish, causing a traffic jam and cross-slip, facilitating dislocation interactions, multiplication, and accumulation. Wavy dislocations form walls that entangle with slip bands, promoting strain hardening and delocalizing plastic strain. A simultaneous combination of high yield strength (1.1 GPa) and tensile strain to failure (28%) is achieved; these values are among the best reported so far for refractory high-entropy alloys. © The Royal Society of Chemistry.
关键词 ：
Ductility Ductility Entropy Entropy High-entropy alloys High-entropy alloys Refractory alloys Refractory alloys Spinodal decomposition Spinodal decomposition Strain hardening Strain hardening Superalloys Superalloys Tensile strain Tensile strain Traffic congestion Traffic congestion
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Yang, Tao et al. Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy [J]. | Materials Horizons , 2021 , 8 (3) : 948-955 . |
| MLA | An, Zibing et al. "Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy" . | Materials Horizons 8 . 3 (2021) : 948-955 . |
| APA | An, Zibing , Mao, Shengcheng , Yang, Tao , Liu, Chain Tsuan , Zhang, Bin , Ma, Evan et al. Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy . | Materials Horizons , 2021 , 8 (3) , 948-955 . |
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摘要 ：
Silicon heterojunction solar cells are expected to increase their market share in the near future. Qu et al. identify an embedded nanotwin structure at the crystalline silicon/hydrogenated amorphous silicon interface of silicon heterojunction cells that limits the device performance and devise an approach to suppress its formation. The interface of high-quality crystalline silicon/hydrogenated amorphous silicon (c-Si/a-Si:H) is indispensable for achieving the ideal conversion efficiency of Si heterojunction solar cells. Therefore, it is extremely desirable to characterize and control the interface at the atomic scale. Here, we employ spherical aberration-corrected transmission electron microscopy to investigate the atomic structure of the c-Si/a-Si:H interface in high-efficiency Si heterojunction solar cells. Their structural evolution during in situ annealing is visualized at the atomic scale. High-density embedded nanotwins, detrimental to the device performance, are identified in the thin epitaxial layer between c-Si and a-Si:H. The nucleation and formation of these nanotwins are revealed via ex situ and in situ high-resolution transmission electron microscopy. Si heterojunction solar cells with low-density nanotwins are fabricated by introducing an ultra-thin intrinsic a-Si:H buffer layer and show better performance, indicating that the strategy to restrain embedded nanotwins can further enhance the conversion efficiency of Si heterojunction solar cells.
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| GB/T 7714 | Qu, Xianlin , He, Yongcai , Qu, Minghao et al. Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells [J]. | NATURE ENERGY , 2021 , 6 (2) : 194-202 . |
| MLA | Qu, Xianlin et al. "Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells" . | NATURE ENERGY 6 . 2 (2021) : 194-202 . |
| APA | Qu, Xianlin , He, Yongcai , Qu, Minghao , Ruan, Tianyu , Chu, Feihong , Zheng, Zilong et al. Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells . | NATURE ENERGY , 2021 , 6 (2) , 194-202 . |
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摘要 ：
Previous molecular simulations and experiments suggest that grain boundaries (GBs) serve as dislocation sources in nanocrystalline metals. Although a large number of studies have been carried out, direct experimental evidence of dislocation nucleation from GBs has rarely been achieved. In this work, we performed in situ transmission electron microscopy (TEM) observations for a Pt nanocrystalline film with an average grain size of -10 nm during tensile deformation. This study revealed direct evidence of dislocation nucleation at the GBs at the atomic scale. This is different from the common hypothesis predicted by molecular dynamic simulations that only partial dislocations are emitted from GBs in small-grained structures.
关键词 ：
Dislocations Dislocations Grain boundary-mediated plasticity Grain boundary-mediated plasticity Nanocrystalline metal Nanocrystalline metal Transmission electron microscopy Transmission electron microscopy
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| GB/T 7714 | Li, Xiaochen , Long, Haibo , Zhang, Jianfei et al. Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum [J]. | MATERIALS CHARACTERIZATION , 2021 , 181 . |
| MLA | Li, Xiaochen et al. "Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum" . | MATERIALS CHARACTERIZATION 181 (2021) . |
| APA | Li, Xiaochen , Long, Haibo , Zhang, Jianfei , Ma, Dongfeng , Kong, Deli , Lu, Yan et al. Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum . | MATERIALS CHARACTERIZATION , 2021 , 181 . |
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