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| 1 | 原位界面工程构建二元过渡金属碳化物异质结构及其高效全解水性能研究显示文摘调控催化剂表面的化学键来平衡表面水分子的吸附和分解对于碱性溶液中水分解至关重要.本研究提出一种通过原位界面工程来设计与合成表面具有丰富的Ni-W金属键的Ni2W4C-W3C Janus异质结构的简便策略.预先将金属离子均匀分散在纳米纤维中,在碳化过程中,以电纺纤维为反应器,金属盐首先被还原成Ni和W3C.在持续分解的过程中,Ni原子原位插入W3C晶体中形成新的Ni2W4C相,得到Ni2W4C-W3C Janus异质结构.这使得W3C中原本惰性的W原子成为Ni2W4C中的活性位点.Ni2W4C-W3C/碳纳米纤维可以直接作为电极材料,其在碱性电解液中析氢活性达到10 m A/cm^2的电流密度需要63 m V过电位,析氧活性达到30 m A/cm^2的电流密度需要270 m V的过电位.若同时用作阴极和阳极进行全解水性能研究,其电池电压分别需要1.55和1.87 V就达到10和100 m A/cm^2.密度泛函理论结果表明,Ni与W之间的强相互作用增强了W原子的局域电子态.Ni2W4C为H-OH键的裂解提供了活性位点,W3C促进了Hads中间体与H2分子的结合.原位电化学拉曼光谱的结果表明该材料对水分子和羟基具有很强的吸收能力,W原子是真正的反应活性位点.该方法为构建高效电解水催化材料提供了另一种思路. | 张颂歌 高国华 朱罕 蔡乐娟 姜小迪 陆双龙 段芳 东为富 柴扬 杜明亮 | 2020 | Science Bulletin2020，65，8： | 3 |
| 2 | Application of transparent soil model tests to study the soil-rock interfacial sliding mechanism显示文摘When transparent soil technology is used to study the displacement of a slope, the internal deformation of the slope can be visualized. We studied the sliding mechanism of the soil-rock slope by using transparent soil technology and considering the influence of the rock mass Barton joint roughness coefficient, angle of the soil mass, angle of the rock mass and soil thickness factors on slope stability. We obtained the deformation characteristics of the soil and rock slope with particle image velocimetry and the laser speckle technique. The test analysis shows that the slope sliding can be divided into three parts: displacements at the top, the middle, and the bottom of the slope; the decrease in the rock mass Barton joint roughness coefficient, and the increase in soil thickness, angles of the rock mass and soil mass lead to larger sliding displacements. Furthermore, we analyzed the different angles between the rock mass and soil thickness. The test result shows that the displacement of slope increases with larger angle of the rock mass. Conclusively, all these results can help to explain the soil-rock interfacial sliding mechanism. | WANG Zhuang LI Chi DING Xuan-ming | 2019 | Journal of Mountain Science2019，16，4： | 3 |
| 3 | Interfacial Voids Trigger Carbon-Based, All-Inorganic Cs Pb IBr2 Perovskite Solar Cells with Photovoltage Exceeding 1.33 V显示文摘A novel interface design is proposed for carbon-based,all-inorganic CsPbIBr2 perovskite solar cells(PSCs)by introducing interfacial voids between TiO2 electron transport layer and CsPbIBr2 absorber.Compared with the general interfacial engineering strategies,this design exempts any extra modification layer in final PSC.More importantly,the interfacial voids produced by thermal decomposition of 2-phenylethylammonium iodide trigger three beneficial e ects.First,they promote the light scattering in CsPbIBr2 film and thereby boost absorption ability of the resulting CsPbIBr2 PSCs.Second,they suppress recombination of charge carriers and thus reduce dark saturation current density(J0)of the PSCs.Third,interfacial voids enlarge built-in potential(Vbi)of the PSCs,awarding increased driving force for dissociating photo-generated charge carriers.Consequently,the PSC yields the optimized e ciency of 10.20%coupled with an open-circuit voltage(Voc)of 1.338 V.The Voc achieved herein represents the best value among CsPbIBr2 PSCs reported earlier.Meanwhile,the non-encapsulated PSCs exhibit an excellent stability against light,thermal,and humidity stresses,since it remains^97%or^94%of its initial e ciency after being heated at 85℃for 12 h or stored in ambient atmosphere with relative humidity of 30–40%for 60 days,respectively. | Weidong Zhu Zeyang Zhang Dandan Chen Wenming Chai Dazheng Chen Jincheng Zhang Chunfu Zhang Yue Hao | 2020 | Nano-Micro Letters2020，12，7： | 3 |
| 4 | I/P interface modification for stable and efficient perovskite solar cells显示文摘Interface engineering has played an increasingly essential role in the development of perovskite solar cells(PSCs).Herein,we adopted an effective and simple one-step interface passivation method on a FA-based perovskite to fabricate efficient and stable planar PSCs.The surface defects are reduced by the perovskite interface passivation layer incorporated between the hole transport and perovskite absorber layers,and then non-radiative recombination is suppressed while interfacial carrier extraction is enhanced.The passivated planar PSCs demonstrates 20.83%power conversion efficiency(PCE),which is caused by the simultaneous enhancement of the fill factor and open-circuit voltage.In addition,the device also shows great ambient and thermal stability.It retains 94%of its original PCE after 1000 h under ambient air without encapsulation as well as90%of its initial efficiency after 400 h under continuous heating at 65°C with encapsulation.This research provides a strategy for the development of efficient and stable PSCs. | Jie Zhang Shixin Hou Renjie Li Bingbing Chen Fuhua Hou Xinghua Cui Jingjing Liu Qi Wang Pengyang Wang Dekun Zhang Ying Zhao Xiaodan Zhang | 2020 | Journal of Semiconductors2020，41，5： | 1 |
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