何荣桓
博士 教授 博士生导师
东北大学 理学院化学系
质子交换膜燃料电池中的电解质-质子交换膜
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- 姓名:何荣桓
- 目前身份:在职研究人员
- 担任导师情况:博士生导师
- 学位:博士
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学术头衔:
博士生导师, 享受国务院特殊津贴专家, 教育部“新世纪优秀人才支持计划”入选者, 省级人才支持计划入选者
- 职称:高级-教授
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学科领域:
物理化学
- 研究兴趣:质子交换膜燃料电池中的电解质-质子交换膜
何荣桓,女,1965年生。1985年毕业于南开大学化学系,1988年获南开大学环境科学系硕士学位。1988至2000年为烟台师范学院化学系助教(1988-1991),讲师(1992-1995),副教授(1996-2000)。其间主要从事微量物质的分析等研究。作为项目主持人和第二参与者先后完成了山东省自然科学基金项目共四项。1997年获得山东省高等学校中青年学术骨干学科带头人培养基金。2000年5月起在Technical University of Denmark化学系从事质子交换膜燃料电池的研究工作。在燃料电池领域,主要从事高温质子交换膜的研究。在丹麦科技大学化学系相继作访问学者和攻读博士学位期间,参加了欧盟第五期框架研究计划项目(ENK5-CT-2000-00323),北欧工业基金项目(Nordic Industrial foundation) (NI99-00443) 等国际重大合作项目的研究工作。2004年获The Royal Veterinary and Agricultural University of Denmark博士学位。2003年6月至今为东北大学化学系教授。2010年1月至7月在美国凯斯西储大学化工系做高级访问学者。
主要从事质子交换膜燃料电池中的电解质-质子交换膜的研究。共发表论文90余篇,其中SCI 收录33篇。所发表论文近三年的SCI被引用次数为60余次。2004年入选新世纪优秀人才支持计划项目。 2007年入选辽宁省百千万人才工程百人层次。2013年获得自然科学教学国务院政府特殊津贴。
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【期刊论文】Catalytic determination of cobalt by a concentration-jump chemical relaxation method
何荣桓, Ronghuan He, Jianhua Wang
R. He, J. Wang / Analytica Chimica Acta 432 (2001) 151-156,-0001,():
-1年11月30日
Acatalytic procedure incorporated with a concentration-jump chemical relaxation methodwas proposed, based on detectionby UV-VIS spectrophotometry. The chemical relaxation process of Fe(Ⅲ)-bipyridyl complex reduced to Fe(Ⅱ)-bipyridyl byphotoreduction in the presence of cobalt(Ⅱ) as a catalyst had been studied. The systemwas first pre-equilibrated, and afterwardsa perturbation (concentration-jump) of Fe(Ⅲ), which is about 30% of the pre-equilibrium concentration was introduced. Thesystem was allowed to relax to a new state of equilibrium, and the relaxation process was recorded. The calibration graphof relaxation time (1/τ) and cobalt concentration is linear for 0-2.5mgml-1. The 3σdetection limit is 12ng ml-1, and therelative standard deviation for 1mgml−1 level ofCo2+is 3.6% (n=4). The procedure had been validated by the determinationof cobalt in a certified reference material and a soil sample, with coefficients of variances of 1.3 and 2.9%, respectively. Arecovery test is also performed for the soil sample by spiking, and the recovery of 98% was obtained.
Chemical relaxation, Concentration-jump, Catalytic spectrophotometry, Incineration ash, Soil, Cobalt
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【期刊论文】The CO Poisoning Effect in PEMFCs Operational at Temperatures up to 200℃
何荣桓, Qingfeng Li, *, z Ronghuan He, Ji-An Gao, Jens Oluf Jensen, and Niels. J. Bjerrum*
Journal of The Electrochemical Society, 150 (12) A1599-A1605 (2003),-0001,():
-1年11月30日
The CO poisoning effect on carbon-supported platinum catalysts (at a loading of 0.5mg Pt/cm2 per electrode) in polymerelectrolyte membrane fuel cells (PEMFC) has been investigated in a temperature range from 125 to 200℃ with the phosphoricacid-doped polybenzimidazole membranes as electrolyte. The effect is very temperature-dependent and can be sufficiently suppressedat elevated temperature. By defining the CO tolerance as a voltage loss less than 10mV, it is evaluated that 3% CO inhydrogen can be tolerated at current densities up to 0.8 A/cm2 at 200℃, while at 125℃ 0.1% CO in hydrogen can be tolerated atcurrent densities lower than 0.3 A/cm2. For comparison, the tolerance is only 0.0025% CO (25ppm) at 80℃ at current densitiesup to 0.2 A/cm2. The relative anode activity for hydrogen oxidation was calculated as a function of the CO concentration andtemperature. The effect of CO2 in hydrogen was also studied. At 175℃, 25% CO2 in the fuel stream showed only the dilutioneffect.
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何荣桓, Ronghuan He, Qingfeng Li, Gang Xiao, Niels J. Bjerrum*
R. He et al./Journal of Membrane Science 226 (2003) 169-184,-0001,():
-1年11月30日
Phosphoric acid doped polybenzimidazole (PBI) and PBI composite membranes have been prepared in the present work.The PBI composites contain inorganic proton conductors including zirconium phosphate (ZrP), (Zr(HPO4)2•nH2O), phosphotungsticacid (PWA), (H3PW12O40•nH2O) and silicotungstic acid (SiWA), (H4SiW12O40•nH2O). The conductivity ofphosphoric acid doped PBI and PBI composite membranes was found to be dependent on the acid doping level, relativehumidity (RH) and temperature. A conductivity of 6.8×10-2 S cm-1 was observed for PBI membranes with a H3PO4 dopinglevel of 5.6 (mole number of H3PO4 per repeat unit of PBI) at 200℃ and 5% RH. A higher conductivity of 9.6×10-2 S cm-1was obtained by composite of 15 wt.% of ZrP in a PBI membrane under the same conditions. Homogeneous membraneswith good mechanical strength were prepared by introducing PWA (20-30 wt.%) and SiWA (20-30 wt.%) into PBI, and theirconductivity were found to be higher than or comparable with that of the PBI membrane at temperatures up to 110℃.
Conductivity, Polybenzimidazole, Phosphoric acid, Inorganic proton conductor, Membrane, Fuel cell
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【期刊论文】Integration of high temperature PEM fuel cells with a methanol reformer
何荣桓, Chao Pan, Ronghuan He, Qingfeng Li*, Jens Oluf Jensen, Niels J. Bjerrum, Henrik Andersen Hjulmand, Anders B'rsting Jensen
C. Pan et al./Journal of Power Sources 145 (2005) 392-398,-0001,():
-1年11月30日
On-board generation of hydrogen by methanol reforming is an efficient and practical option to fuel PEMFC especially for vehicle propulsionpurpose. The methanol reforming can take place at temperatures around 200℃ with a nearly 100% conversion at a hydrogen yield of about400L (h kg catalyst)−1. The CO content in the reformate gas at this temperature is less than 0.2vol.%. The recently developed high temperature PEMFC based on acid-doped PBI membranes can operate in the same temperature range and tolerate a few percent of CO in the feeding gas.The high CO tolerance makes it possible to use the reformate gas directly from the reformer without further CO removal. Integration of hightemperature PEMFC with a reformer is expected to improve the system efficiency and simplify the system construction and operation. Thepresent work has demonstrated this possibility.
High temperature PEM, Fuel cells, Methanol reforming, Integration
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【期刊论文】Physicochemical properties of phosphoric acid doped polybenzimidazole membranes for fuel cells
何荣桓, Ronghuan He a, Qingfeng Li*, Anders Bach, Jens Oluf Jensen, Niels J. Bjerrum
,-0001,():
-1年11月30日
Polybenzimidazole (PBI) membranes have been prepared with different molecular weights. When doped with phosphoric acid the membranes exhibit proton conductivity and have beenproposed for use as electrolyte in fuel cells. The swelling, mechanical strength, gaspermeability and proton conductivity were studied for the pristine and acid doped PBI membranes. When doped with 5 moles phosphoric acid per mole repeat unit of the polymer, alevel necessary to obtain high enough proton conductivity, a volume swelling by ca. 120%was observed, resulting in separation of the polymer backbones. The separation in turnreduces the mechanical strength of the membrane especially at high temperatures from 120 to 180℃. High molecular weight of the polymers improves the mechanical strength. Anotherconsequence is the increased H2 and O2 permeability through the membrane. In thetemperature range from 120 to 180℃, the hydrogen permeability was found to be 1.6 to 4.3×10-12mol.cm.cm-2.s-1.bar-1 and 1.2 to 4.0×10-10mol.cm.cm-2. s-1.bar-1 for pristine and aciddoped PBI membranes, respectively, while for oxygen it was 5.0 to 10 10-14mol.cm.cm-2.s-1.bar-1 and 3.0 to 9.4×10-11mol.cm.cm-2.s-1.bar-1, respectively. Conductivity measurementsshowed little influence of the polymer molecular weight.
Polybenzimidazole, Membrane strength, Gas permeability, Conductivity, Fuel cell
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【期刊论文】A Novel Catalytic Procedure for the Determination of Ultratrace Zirconium
何荣桓, Ronghuan He* and Jianhua Wang
,-0001,():
-1年11月30日
A novel catalytic procedure for zirconiumwas proposed based on Zr(Ⅳ) catalyzed oxidation ofgallocyanine by hydrogen peroxide in hexamethylenetetramine-hydrochloric acid buffer medium. The calibrationgraph is linear for 0-110ng·ml-1, and thedetection limit is 0.4ng·ml-1 Zr(Ⅳ). Most foreignions do not interfere with the determination, exceptfor Cu2+, Fe3+ and Cr(VI). The interferences of Cu2+and Fe3+ could be eliminated by masking with EDTAand mannitol, and that of Cr(Ⅵ) by reducing to Cr(Ⅲ)with ascorbic acid. The typical features of this procedureare that it is sensitive for zirconium, and the determinationcould be carried out at room temperature. It hadbeen used to the determination of zirconium in zirconiumbronze, simulated samples and a certfied refer-encematerial. The recoveries were 98.6~102%, andrelative standard deviations (R.S.D.) were 0.9~1.5%,respectively.
Catalytic spectrophotometry, gallocyanine, zirconium.,
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何荣桓, Ronghuan He, Hua Jiang, and Jianhua Wang
,-0001,():
-1年11月30日
A concentration-jump chemical relaxationcatalytic procedure by using stopped flow injection isdescribed with detection by spectrophotometry. Thephotoreduction of the Fe(Ⅲ)-bipyridyl complex toFe(Ⅱ)-bipyridyl is pre-equilibrated at dark for at least12h. This solution is afterwards delivered by a peristalticpump and mixed up with a stream of Co2+ solutionas a catalyst. The mixture is confluenced down-streamwith a flow of Fe(Ⅲ) solution from a second pump, theconcentration of which is about 30% of the preequilibratedFe(Ⅲ)-bipyridyl solution and acts as theperturbation (concentration-jump). The chemical relaxationprocess was monitored under thermodynamicallynon-equilibrium state, and the characteristic parameterof the relaxation process, relaxation time, is derived.The calibration graph between 1=-1 and cobalt concentrationis linear within 0.1-2.5μgmL-1. The detectionlimit (LOD) and precision (RSD) are 9 ngmL-1 and1.6%, respectively, both have been improved as comparedto 12ngmL-1 and 3.6% with a former reportedmanually operated procedure. The present procedurehas been applied to the determination of cobalt in acertified reference material and a soil sample.
Stopped flow injection, chemical relaxation, concentration-jump, catalytic spectrophotometry, cobalt.,
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何荣桓, Q. Li*, R. He, J.O. Jensenl, and N.J. Bjerrum
FUEL CELLS 2004, 4, No.3,-0001,():
-1年11月30日
Proton exchange membrane fuel cell (PEMFC) technologybased on perfluorosulfonic acid (PFSA) polymer membranesis briefly reviewed. The newest development in alternativepolymer electrolytes for operation above 100℃ is summar-ized and discussed. As one of the successful approaches tohigh operational temperatures, the development and evalua-tion of acid doped polybenzimidazole (PBI) membranes arereviewed, covering polymer synthesis, membrane casting,acid doping, physicochemical characterization and fuel celltesting. A high temperature PEMFC system, operational atup to 200℃ based on phosphoric acid-doped PBI mem-branes, is demonstrated. It requires little or no gas humidifi-cation and has a CO tolerance of up to several percent. Thedirect use of reformed hydrogen from a simple methanolreformer, without the need for any further CO removal, hasbeen demonstrated. A lifetime of continuous operation, forover 5000h at 150℃, and shutdown-restart thermal cycletesting for 47 cycles has been achieved. Other issues such ascooling, heat recovery, possible integration with fuel proces-sing units, associated problems and further development arediscussed.
PEMFC,, Polybenzimidazole (, PBI), ,, Fuel Cell,, Polymer Electrolyte Membrane,, High Temperature
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【期刊论文】Water uptake and acid doping of polybenzimidazoles as electrolyte membranes for fuel cells
何荣桓, Qingfeng Li*, Ronghuan He, Rolf W. Berg, Hans A. Hjuler, Niels J. Bjerrum
Q. Li et al./Solid State Ionics 168 (2004) 177-185,-0001,():
-1年11月30日
Acid-doped polybenzimidazole (PBI) membranes have been demonstrated for fuel cell applications with advanced features such as highoperating temperatures, little humidification, excellent CO tolerance, and promising durability. The water uptake and acid doping of PBImembranes have been studied. The water uptake of PBI from the vapour phase is only slightly increased as the atmospheric humidity increasesup to unity (100%). Little difference is observed for the water uptake from vapour and liquid phases, behaving very differently from Nafionmembranes. When doped with phosphoric acid at low levels (P<2), the active sites of the imidazole ring are preferably occupied by the dopingacid and the water uptake is consequently lower. At higher acid doping levels, the water uptake is influenced by the excess of hygroscopic acidand higher water uptake than for Nafion membranes is observed. Upon doping, the acid is found to be concentrated inside the polymer. Onlytwo molecules of phosphoric acid are bonded to each repeat unit of PBI, corresponding to the two nitrogen sites available. Infrared and Ramanspectra show the presence of strong hydrogen bonds between phosphoric acid and nitrogen atoms of the imidazole rings. The excessive dopingacid is "free acid" that contributes to high conductivity but suffers from a fast washing out when adequate liquid is present.
Polymer membrane, Fuel cell, Polybenzimidazole (, PBI), , Water uptake, Aciddoping
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何荣桓
,-0001,():
-1年11月30日
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