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| 1 | Multimetallic AuPd@Pd@Pt core-interlayer-shell icosahedral electrocatalysts for highly efficient oxygen reduction reaction显示文摘Incorporating Pt with core metals into Pt-based core-shell catalysts is regarded as a promising strategy to substantially enhance the catalytic properties towards oxygen reduction reaction(ORR) in fuel cells due to the synergetic effect between distinct metals. In this wok, ultrathin Pt skins with two atomic layers were epitaxially coated on as-prepared icosahedral Au_50Pd_50, Au_60Pd_40 and Au_66Pd_34 nanocrystal seeds,which are constructed with alloyed cores and Pd shells with different thickness. Through electron microscopic characterizations, Pd interlayers with tunable thickness of 3, 6, and 12 atomic layers can be found in the Au_66Pd_34@Pt, Au_60 Pd_40@Pt and Au_50Pd_50@Pt icosahedra, respectively. These icosahedral Au Pd@Pd@Pt nanocrystals show substantially enhanced activities and durabilities in electrocatalytic measurements towards ORR compared to Au_75Pd_25@Pt icosahedra without Pd interlayer and commercial Pt/C catalysts. Specifically, Au_60Pd_40@Pt icosahedra with 6 atomically thick Pd interlayer display the best electrocatalytic performances, whose mass activities before and after durability tests of 50,000 cycles are11.6 and 30.2 times, respectively, as high as that of the commercial Pt/C. | Qingfeng Xu Wenlong Chen Yucong Yan Zhemin Wu Yi Jiang Junjie Li Ting Bian Hui Zhang Jianbo Wu Deren Yang | 2018 | Science Bulletin2018，63，8： | 5 |
| 2 | Oxygen vacancy engineering of calcium cobaltate:A nitrogen fixation electrocatalyst at ambient condition in neutral electrolyte显示文摘In order to sustainably transform N2 to ammonia(NRR)using electrocatalysts under mild ambient condition,it is urgent to design and develop non-nobel metal nanocatalysts that are inexpensive and suitable for mass-production.Herein,a calcium metalate catalyst CaCoO_(x)with oxygen vacancies was synthesized and used as an electrocatalyst for NRR for the first time,whose morphology can be controlled by the calcination temperature and the heating rate.Under the optimal conditions,the CaCoO_(x)catalyst achieved the yield of nitrogen conversion to ammonia of 16.25μg·h^(-1)·mg_(cat.)^(-1)at the potential of-0.3 V relative to the reversible hydrogen electrode(RHE)with a Faraday efficiency of 20.51%.The electrocatalyst showed good stability even after 12 times recyclability under environmental conditions and neutral electrolyte.Later,the electrocatalytic nitrogen reduction performance of CaFeO_(x),CaNiO_(x),CaCuO_(x)was investigated.These earth-rich transition metals also exhibited certain NRR electrocatalytic capabilities,which provided a door for further development of inexpensive and easily available transition metal as nitrogen reduction electrocatalysts. | Xinyu Chen Ke Li Xiaoxuan Yang Jiaqi Lv Sai Sun Siqi Li Dongming Cheng Bo Li Yang-Guang Li Hong-Ying Zang | 2021 | Nano Research2021，14，2： | 2 |
| 3 | 限域型贵金属氧还原反应电催化剂研究进展显示文摘开发高效的氧还原反应电催化剂是实现质子交换膜燃料电池规模化应用的关键技术之一。目前常用的贵金属催化剂成本较高,并且稳定性仍需改善。物理限域是改善催化剂稳定性的有效策略,在不影响贵金属催化剂催化活性的前提下,物理限域层不仅可以抑制催化剂的烧结,还能够减少催化剂在反应过程中的团聚、脱落以及溶解等问题,从而提升催化剂的寿命。本文回顾了近年来用于电催化氧还原反应的限域型贵金属催化剂,主要包括导电聚合物限域、非金属氧化物限域、金属氧化物限域以及碳层限域的贵金属催化剂。根据限域层制备策略不同,重点分析了限域层的孔结构、导电性、致密性、抗腐蚀性与催化剂性能之间的构效关系。着重介绍了实现碳层限域的三种策略,包括“沉积-转化”、“嵌入-转化”以及“一步热解”。分析表明,通过构筑具有丰富孔结构、高导电性及合适厚度的限域层能够在保证活性的同时显著提升催化剂稳定性。最后对全文进行了总结并对当前存在的问题进行了整理,同时对未来限域型催化剂的发展进行了展望。 | 胡冶州 王双 申涛 朱叶 王得丽 | 2022 | 储能科学与技术2022，11，4： | 1 |
| 4 | Pt@h-BN core-shell fuel electrocatalysis confined cell electrocatalysts wit under outer shells显示文摘 | Mengmeng Sun Jinchao Dong Yang Lv Siqin Zhao Caixia Meng Yujiang Song Guoxiong Wang Jianfeng Li Qiang Fu Zhongqun Tian Xinhe Bao | 2018 | Nano Research2018，11，6： | 0 |
| 5 | Pt-H2SO4/Zr-montmorillonite: An efficient catalyst for the polymerization of octamethylcy-clotetrasiloxane, polymethylhydrosiloxane and hexamethyldisiloxane to low-hydro silicone oil显示文摘The liquid phase ring-opening of octamethylcy-clotetrasiloxane(D_4) was investigated over Pt-H_2SO_4/Zrmontmorillonite catalyst. Montmorillonite(Mt), Zr-Mt, H_2SO_4/Mt, H_2SO_4/Zr-Mt and Pt-H_2SO_4/Zr-Mt were also detected for evaluation. The catalysts were characterized by X-ray fluorescence, X-ray diffraction, nitrogen adsorption–desorption, NH_3-TPD and pyridine-FTIR measurements. In comparison to activate clay which is used in the industry of catalyst, Zr-Mt catalyst displayed stronger acidity and more excellent catalytic activity in the polymerization of D_4, polymethylhydrosiloxane(D_4 H) and hexamethyldisiloxane(MM) to low-hydro silicone oil. Relative to Zr-Mt, the acidity of H_2SO_4/Zr-Mt was noticeably improved and the catalyst exhibited a higher capability of ring-opening of D_4 conversion and yield of low-hydro silicone oil. To enhance the stability of H_2SO_4/Zr-Mt catalyst, a small amount of metals(Pt) was doped. The nitrogen adsorption–desorption results indicated that pore textural parameters of the Pt-H_2SO_4/Zr-Mt had not changed with larger specific surface area. Compared with H_2SO_4/Zr-Mt, the total acidity of Pt-H_2SO_4-Zr/Mt catalyst retained, but the content of the Br?nsted acid increased and the content of the Lewis acid decreased. The Pt-H_2SO_4-Zr/Mt catalyst displayed higher catalyst reproducibility. After 40 h reaction of polymerization, the yield of low-hydro silicone oil decreased from 93% to 42% over H_2SO_4/Zr-Mt catalyst, while the yield of low-hydro silicone oil reduced from 93% to 78%over Pt-H_2SO_4/Zr-Mt catalyst. A sharp decrease in catalytic activity after 35 h of Pt-H_2SO_4/Zr-Mt catalyst was detected. Furthermore, Pt-H_2SO_4/Zr-Mt was completely regenerated under appropriate condition and appeared good repeatability in the D_4, D_4 Hand MM to low-hydro silicone oil. | Yuedong Zhou Fengfu Li Junwei Liu Zhi Yun Xia Gui | 2017 | Chinese Journal of Chemical Engineering2017，25，12： | 0 |
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