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| 1 | Iron-group electrocatalysts for ambient nitrogen reduction reaction in aqueous media显示文摘Electrochemical nitrogen reduction reaction(NRR)is considered as an alternative to the industrial Haber-Bosch process for NH3 production due to both low energy consumption and environment friendliness.However,the major problem of electrochemical NRR is the unsatisfied efficiency and selectivity of electrocatalyst.As one group of the cheapest and most abundant transition metals,iron-group(Fe,Co,Ni and Cu)electrocatalysts show promising potential on cost and performance advantages as ideal substitute for traditional noble-metal catalysts.In this minireview,we summarize recent advances of iron-group-based materials(including their oxides,hydroxides,nitrides,sulfides and phosphides,etc.)as non-noble metal electrocatalysts towards ambient N2-to-NH3 conversion in aqueous media.Strategies to boost NRR performances and perspectives for future developments are discussed to provide guidance for the field of NRR studies. | Benyuan Ma Haitao Zhao Tingshuai Li Qian Liu Yongsong Luo Chengbo Li Siyu Lu Abdullah M.Asiri Dongwei Ma Xuping Sun | 2021 | Nano Research2021，14，3： | 8 |
| 2 | Porous LaFeO3 nanofiber with oxygen vacancies as an efficient electrocatalyst for N2 conversion to NH3 under ambient conditions显示文摘Electrocatalytic N2 reduction to NH3 under ambient conditions is an eco-friendly and sustainable alternative to the traditional Haber-Bosch process. However, inhibited by the high activation barrier of N2, this process needs efficient electrocatalysts to adsorb and activate the N2, enabling the N2 reduction reaction(NRR). Herein, we report that porous LaFeO3 nanofiber with oxygen vacancies acts as an efficient NRR electrocatalyst with abundant active sites to enhance the adsorption and activation of N2. When tested in 0.1 M HCl, such electrocatalyst achieves a high Faradaic efficiency of 8.77% and a large NH3 yield rate of 18.59 μg h–1 mgcat–1.at-0.55 V versus reversible hydrogen electrode. This catalyst also shows high long-term electrochemical stability and excellent selectivity for NH3 formation. Density functional theory calculations reveal that, by introducing oxygen vacancy on LaFeO3, the subsurface metallic ions are exposed with newly localized electronic states near the Fermi level, which facilitates the adsorption and activation of N2 molecules as well as the subsequent hydrogenation reactions. | Chengbo Li Dongwei Ma Shiyong Mou Yongsong Luo Benyuan Ma Siyu Lu Guanwei Cui Quan Li Qian Liu Xuping Sun | 2020 | Journal of Energy Chemistry2020，29，11： | 6 |
| 3 | Novel Phenomenon on Valence Unvariation of Doping Ion in Yb:YAG Transparent Ceramics Using MgO Additives显示文摘Yb:YAG nanopowders were synthesized by the alcohol-water co-precipitation method adding MgO as sintering additives. Appropriate amount of MgO adding can restrict the agglomeration and reduce the particle size of Yb:YAG powders. When the MgO content was 0.04wt%, well-dispersed Yb:YAG powders with ellipsoidal particles of less than 100 nm diameter were obtained. The experimental results showed the valence variation of doping ion Yb3+ would not appear when adding MgO as sintering additives, so ceramics showed colorless transparent instead of green due to Yb2+ color center using traditional SiO2 as additives. The transmission of the sintered Yb:YAG ceramics can reach 80.6% even without annealing. Ceramic morphology showed that the grains had uniform-distribution with the size of 10 μm or so, and no impurity and pore existed in the grain boundary and crystalline while using optimal sintering conditions. | 卢忠文 卢铁城 WEI Nian MA Benyuan ZHANG Wei LI Feng GUAN Yongbing | 2013 | Journal of Wuhan University of Technology(Materials Science)2013，28，2： | 2 |
| 4 | Microstructural sintering evolution and sintering parameters optimization of the silica-doped Nd:YAG ceramics using the co-precipitated raw powder显示文摘 | MA Benyuan LU Tiecheng ZHANG Wei | 2015 | J Eur Ceram Soc2015，35，24： | 1 |
| 5 | Improvement of optical properties of Nd:YAG transparent ceramics by post-annealing and post hot isostatic pressing显示文摘 | Wei Zhang Tiecheng Lu Benyuan Ma Nian Wei Zhongwen Lu Feng Li Yongbing Guan Xingtao Chen Wei Liu Lu Qi | 2013 | Optical Materials2013，，： | 1 |
| 6 | An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement显示文摘Achieving full densification of some ceramic materials,such as Y_(2)O_(3),without sintering aids by spark plasma sintering(SPS)is a great challenge when plastic deformation contributes limitedly to the densification as the yield stress of the material at an elevated temperature is higher than the applied sintering pressure.Herein,we demonstrate that particle fracture and rearrangement is an effective strategy to promote the densification during the pressure-assisted sintering process.Specifically,Y_(2)O_(3) nanocrystalline powders composed of nanorod and near-spherical particles were synthesized and sintered at various temperatures by the SPS.The results show that the relative density of the ceramics prepared by the nanorod powders is higher than the density of the ceramics from the near-spherical powders after 600℃ due to the fracture and rearrangement of the nanorods at low temperatures,which leads to the decrease of particle size and the increase of density and homogeneity.Based on this novel densification mechanism,ultrafine-grained Y_(2)O_(3) transparent ceramics with good optical and mechanical properties were fabricated successfully from the nanorod powders. | Zhangyi HUANG Yang SHI Yutong ZHANG Mao DENG Yi GUO Qingquan KONG Jianqi QI Benyuan MA Qingyuan WANG Haomin WANG | 2022 | Journal of Advanced Ceramics2022，11，12： | 0 |
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