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| 1 | The effect of high-temperature annealing on LaFe_(11.5)Si_(1.5) and the magneto-caloric properties of La_(1-x)Ce_xFe_(11.5)Si_(1.5) compounds显示文摘The powder X-ray diffraction patterns of LaFe11.5Si1.5 compounds annealed at different high temperatures from 1323 K (5 h) to 1623 K (2 h) show that a large amount of 1:13 phase begins to form in LaFe11.5Si1.5 compound annealed at 1423 K (5 h). In the temperature range from 1423 to 1523 K, α-Fe and LaFeSi phases rapidly decrease to form 1:13 phase. LaFeSi phase is rarely observed, and the most amount of 1:13 phase is obtained in the compound annealed at 1523 K (5 h). With the annealing temperature increasing to 1573 and 1623 K, LaFeSi is detected again in the LaFe11.5Si1.5 compound. According to the results of annealing at different high-temperatures, the La1-xCexFe11.5Si1.5 compounds are annealed at high temperatures of 1373 K (2 h) + 1523 K (5 h). The main phase is NaZn13-type phase, and the impurity is a small amount of α-Fe in La1-xCexFe11.5Si1.5 compounds with 0 ≤ x ≤ 0.35, and there is a large amount of Ce2Fe17 phase in La0.5Ce0.5Fe11.5Si1.5. It indicates that the substitution of cerium atoms for La in LaFe11.5Si1.5 compounds has limit. At the same time, the substitution of Ce for La has large effect on magnetocaloric properties. With increasing Ce content from x = 0 to x = 0.35, the Curie temperature decreases linearly from 196 to 168 K, the magnetic entropy change increases from 16.5 to 57.3 J·kg-1·K-1 in a low magnetic field change of 0-2 T, and the thermal hysteresis also increases from 3 K to 8 K. | CHEN Xiang CHEN Yungui TANG Yongbo | 2011 | Rare Metals2011，30，4： | 6 |
| 2 | Table-like magnetocaloric effect and large refrigerant capacity of composite magnetic refrigerants based on LaFe_(11.6)Si_(1.4)H_y alloys显示文摘Composite magnetic refrigerants were prepared by physical mixing LaFe_(11.6)Si_(1.4)H_y alloys with different Curie temperatures(Tc). The phase structures of these LaFe_(11.6)Si_(1.4)H_y alloys were analyzed by X-ray diffraction(XRD) and the magnetocaloric effect(MCE) and refrigerant capacity(RC) of these composite magnetic refrigerants were investigated by experiment and calculation in this paper. The magnetocaloric effect(MCE) and refrigerant capacity(RC) of these composite magnetic refrigerants were investigated by experiment and calculation in this paper. The results indicate the experimental magnetic entropy change(-△S_M)-Tcurve corresponds reasonably with the(-△S_M)-Tcurve calculated by the linear combination of(-△S_M)-T curves of the single material. An optimal mixing ratio can make the composite magnetic refrigerant possess a table-like(-△S_M)-Tcurve which is beneficial to magnetic Ericsson cycle. When three LaFe_(11.6)Si_(1.4)H_y alloys with different T_c are mixed, the full width at half maximum(△T_(FWHM)) of(-△S_M)-T curves is about 48.7 K and the RC is about 177.76 J/kg under a magnetic field change of 2 T. The composite magnetic refrigerants based on LaFe_(11.6)Si_(1.4)H_y alloys can be promising candidates for near room temperature magnetic refrigeration and the work will be helpful to develop novel composite magnetic refrigerants with table-like MCE and large RC. | Lingtong Zhou Yongbai Tang Yungui Chen Huaqiang Guo Wenkai Pang Xi Zhao | 2018 | Journal of Rare Earths2018，36，6： | 5 |
| 3 | Substantial transition to clean household energy mix in rural China显示文摘The household energy mix has significant impacts on human health and climate,as it contributes greatly to many health-and climate-relevant air pollutants.Compared to the well-established urban energy statistical system,the rural household energy statistical system is incomplete and is often associated with high biases.Via a nationwide investigation,this study revealed high contributions to energy supply from coal and biomass fuels in the rural household energy sector,while electricity comprised∼20%.Stacking(the use of multiple sources of energy)is significant,and the average number of energy types was 2.8 per household.Compared to 2012,the consumption of biomass and coals in 2017 decreased by 45%and 12%,respectively,while the gas consumption amount increased by 204%.Increased gas and decreased coal consumptions were mainly in cooking,while decreased biomass was in both cooking(41%)and heating(59%).The time-sharing fraction of electricity and gases(E&G)for daily cooking grew,reaching 69%in 2017,but for space heating,traditional solid fuels were still dominant,with the national average shared fraction of E&G being only 20%.The non-uniform spatial distribution and the non-linear increase in the fraction of E&G indicated challenges to achieving universal access to modern cooking energy by 2030,particularly in less-developed rural and mountainous areas.In some non-typical heating zones,the increased share of E&G for heating was significant and largely driven by income growth,but in typical heating zones,the time-sharing fraction was<5%and was not significantly increased,except in areas with policy intervention.The intervention policy not only led to dramatic increases in the clean energy fraction for heating but also accelerated the clean cooking transition.Higher income,higher education,younger age,less energy/stove stacking and smaller family size positively impacted the clean energy transition. | Guofeng Shen Rui Xiong Yanlin Tian Zhihan Luo Bahabaike Jiangtulu Wenjun Meng Wei Du Jing Meng Yuanchen Chen Bing Xue Bin Wang Yonghong Duan Jia Duo Fenggui Fan Lei Huang Tianzhen Ju Fenggui Liu Shunxin Li Xianli Liu Yungui Li Mu Wang Ying Nan Bo Pan Yanfang Pan Lizhi Wang Eddy Zeng Chao Zhan Yilin Chen Huizhong Shen Hefa Cheng Shu Tao | 2022 | National Science Review2022，9，7： | 4 |
| 4 | Corrosion behavior and magnetocaloric effect of FeNi(1J85) coated LaFe_(11.6)Si_(1.4)/Sn composites显示文摘The FeNi coated LaFe_(11.6)Si_(1.4)/Sn composites were prepared by hot pressing(HP). The microstructure,corrosion behavior and magnetocaloric effect(MCE) of FeNi coated LaFe_(11.6)Si_(1.4)/Sn composites were investigated systematically. The results show that the corrosion resistance of FeNi coated LaFe_(11.6)Si_(1.4)Sn composites is better than that of LaFe_(11.6)Si_(1.4)/Sn composites in deionized water. The maximum magnetic entropy change((-△S_M)^(max)) and relative cooling power(RCP) of FeNi coated LaFe_(11.6)Si_(1.4)/Sn composites are 13.30 J/(kg-K) and 146.25 J/kg, respectively, which are larger than that((-△S_M)^(max), 10.65 J/(kg·K) and RCP, 106.53 J/kg) of LaFe_(11.6)Si_(1.4)/Sn composites in a low magnetic field change of 2 T. FeNi coated LaFe_(11.6)Si_(1.4)/Sn composites possess a more negative slope. The improvement of magnetic properties is due to high permeability FeNi permalloy(1 J85) which improves the itinerant-electron metamagnetic(IEM) transition. So, the method of coating FeNi can provide a new idea for enhancing the corrosion resistance and magnetocaloric effect of La(Fe_xSi_(1-x))_(13)-based materials. | Xi Zhao Ping Fang Yongbai Tang Yungui Chen Lingtong Zhou Huaqiang Guo | 2019 | Journal of Rare Earths2019，37，6： | 3 |
| 5 | Electronic structure, chemical bond and thermal stability of hydrogen absorber Li_2MgN_2H_2显示文摘The lowest total energy crystal structure of Li2MgN2H2 was identified by the first principle calculation with RPBE exchange-correlation function. Furthermore, the fine structure parameters of this crystal structure were calculated with PBE and PW91 exchange-correlation function. In a further step, the density of states, electron density, charge density difference on (0 0 1) plane and heat of formation of Li2MgN2H2 hydrogenation were computed with PW91 exchange-correlation function. Consequently, the electronic structures and chemical bonds in this compound were analyzed and discussed, and then the thermodynamic character of Li2MgN2H2 for hydrogen storage was evacuated. | WANG Qiang CHEN YunGui WU ChaoLing TAO MingDa GAI JingGang | 2009 | Chinese Science Bulletin2009，54，3： | 2 |
| 6 | Effect of single Si_(1−x)C_(x)coating and compound coatings on the thermal conductivity and corrosion resistance of Mg-3Sn alloy显示文摘A single Si_(1−x)C_(x)coating and compound coatings were deposited on Mg-3Sn matrix alloy by magnetron sputtering method.Compound coatings included Mg or Mg/AlTi intermediates between Mg-3Sn substrate and Si_(1−x)C_(x)coating.The thermal conductivity of the Mg-3Sn alloy after coating was enhanced at room temperature.The results showed that the Mg-3Sn alloy coated with Mg/AlTi/Si_(1−x)C_(x)displayed higher thermal conductivity,its thermal conductivity after corrosion was 90.1 W/(m K)and 108.4 W/(m K)at 25℃and 100℃,respectively.Meanwhile,it was revealed that the Mg/Si_(1−x)C_(x)and Mg/AlTi/Si_(1−x)C_(x)compound coatings had nobler Ecorr and much lower i_(corr),higher Rp,compared with the bare Mg-3Sn and Mg-3Sn/Si_(1−x)C_(x)system,and improved the corrosion resistance of the magnesium substrate. | Chunming Wang Sufen Xiao Yungui Chen Xia Liu | 2015 | Journal of Magnesium and Alloys2015，3，1： | 2 |
| 7 | The giant magnetocaloric effect in Gd_(5)Si_(2)Ge_(2)with low purity gadolinium显示文摘The giant magnetocaloric effect Gd5Si2Ge2 alloy was prepared with 99wt% low purity commercial Gd. Pow-der XRD and magnetic measurements showed that the Gd5Si2Ge2 alloy annealed at 1200℃ for 1 h had a significant magnetic- crystallographic first order phase transition at about 270 K. The maximal magnetic entropy change is 17.55 J·kg?1·K?1 under a magnetic field change of 0―5 T. The distinct increase of magnetic entropy change belongs to the first-order phase transition from the orthorhombic Gd5Si4-type to the monoclinic Gd5Si2Ge2-type after high temperature heat-treatment. | ZHANG Tiebang CHEN Yungui FU Hao TENG Baohua TANG Yongbai TU Mingjing | 2005 | Chinese Science Bulletin2005，50，16： | 2 |
| 8 | Sorption of chlorophenols onto fruit cuticles and potato periderm显示文摘To better understand the interaction mechanisms of plant surfaces with polar organic compounds,sorption of 4-chlorophenol,2,4dichlorophenol,and 2,4,6-trichlorophenol by fruit cuticles(i.e.,tomato,apple,and pepper),and potato tuber periderm were investigated.The roles of cuticular components(waxes,cutin,cutan and sugar) on sorption of chlorophenols are quantitatively compared.Cutin and waxes govern the sorption capacity of bulk apple cuticle by hydrophobic interactions.Potato periderm with highest sugar content exhibits the lowest sorption capability for the chlorophenols.With the increase of hydrophobicity(i.e.,K ow) of sorbate,the relative contribution of lipophilic components(wax,cutin and cutan) on total sorption increases,however,the ratios of K oc to K ow decreases due to increasing ionization degree of sorbates. | Yungui Li Yingqing Deng Baoliang Chen | 2012 | Journal of Environmental Sciences2012，24，4： | 2 |
| 9 | Effect of Al on hydrogen storage properties of V30 Ti35 Cr25 Fe10 alloy 显示文摘 | Yan Yigang Chen Yungui Liang Hao | 2006 | J Alloys and Compounds2006，426，： | 1 |
| 10 | The effect of Si on V30 Ti35 Cr25 Fe10 BCC hydrogen storage alloy 显示文摘 | Yan Yigang Chen Yungui Liang Hao | 2007 | J Alloys and Compounds2007，441，： | 1 |
| 11 | Macrophage immunomodulatory activity of extracellular polysaccharide (PEP) of Antarctic bacterium Pseudoaltermonas sp.S-5显示文摘 | Yungui Bai Pengying Zhang Guochuang Chen Jianfeng Cao Taotao Huang Kaoshan Chen | 2012 | International Immunopharmacology2012，，4： | 1 |
| 12 | Is proton a charge carrier for δ-MnO_(2) cathode in aqueous rechargeable magnesium-ion batteries?显示文摘Manganese dioxide(MnO_(2)) is considered as a potential cathode material for aqueous magnesium-ion batteries. However, the charge/discharge mechanism of MnO_(2)in aqueous electrolyte is still unclear. In present study, highly porous δ-MnO_(2) is investigated, which delivers a high capacity of 252.1 m Ah g^(-1) at 0.05 A g^(-1) and excellent rate capability, i.e., 109.7 m Ah g^(-1) at 1 A g^(-1), but a low-capacity retention of 54.4% after 800 cycles at 1 A g^(-1). The two-step discharging process, namely a consequent H^(+) and Mg^(2+) insertion reaction, is verified, by comparing the electrochemical performance of δ-MnO_(2) in 1 M MgCl_(2) and 1 M MnCl_(2) aqueous electrolyte and analyzing detailedly the Mg content and the bonding state of Mn at different charge/discharge state. Furthermore, partial irreversibility of Mg^(-1) ion insertion/extraction is observed, which may be one of the major reasons leading to capacity decay. | Zhenzhen Liu Xiang Li Jian He Qian Wang Ding Zhu Yigang Yan Yungui Chen | 2022 | Journal of Energy Chemistry2022，31，5： | 1 |
| 13 | The structure and high-temperature (333K) electrochemical performance of La 0.8? x Ce x Mg 0.2 Ni 3.5 ( x =0.00–0.20) hydrogen storage alloys显示文摘 | Shen Xiangqian Chen Yungui Tao Mingda Wu Chaoling Deng Gang Kang Zhenzhen | 2009 | International Journal of Hydrogen Energy2009，，8： | 1 |
| 14 | Effect of Al on hydrogen storage properties of V 30 Ti 35 Cr 25 Fe 10 alloy显示文摘 | Yigang Yan Yungui Chen Hao Liang Chaoling Wu Mingda Tao Tu Mingjing | 2006 | Journal of Alloys and Compounds2006，，1： | 1 |
| 15 | Catalytic effect and reaction mechanism of Ti doped in NaAlH_4: A review显示文摘Catalytic effect and hydrogen reaction mechanism of Ti doped in NaAlH4 were elaborated in this paper, and current viewpoints about Ti active species in hydrogen reaction were discussed. In a further step, the possibility and practicality of the hydrogen reaction mechanism of Ti-doped NaAlH_4 were elucidated. They could be summarized as follows: while the current theory about the hydrogen reaction mecha-nism of Ti-doped NaAlH_4 should be further improved and modified, the research on Ti-doped NaAlH_4 would be a recommendable pattern for the catalyst research in other metal complex hydrides. | WANG Qiang CHEN YunGui WU ChaoLing TAO MingDa | 2008 | Chinese Science Bulletin2008，53，12： | 1 |
| 16 | Indentation creep behavior of AE42 and Ca-containing AE41 alloys 显示文摘 | Huang Deming Chen Yungui Tang Yongbai | 2007 | Materials Letters2007，61，： | 1 |
| 17 | Low-temperature hydrogen storage alloy and its application in NiMH battery显示文摘 | Tao Mingda Chen Yungui Wu Chaoling | 2004 | J Rare Earths2004，22，6： | 1 |
| 18 | 显示文摘 | Yan Y G Chen Yungui Liang Hao | 2007 | J Alloys Compd2007，427，： | 1 |
| 19 | Tensile and indentation creep behavior of Mg-5% Sn and MZ-5% Sn-2% Di alloys显示文摘 | Hongmei Liu Yungui Chen Yongbai Tang | 2007 | Materials Science and Engineering A2007，，464： | 1 |
| 20 | Copper recovery from waste printed circuit boards concentrated metal scraps by electrolysis显示文摘 | Xiaonan Liu Qiuxia Tan Yungui Li Zhonghui Xu Mengjun Chen | 2017 | Frontiers of Environmental Science & Engineering2017，11，5： | 1 |
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