李则林
非线性电化学动力学,光谱电化学,纳米电化学,生物电化学,电催化,金属电溶解等领域
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- 姓名:李则林
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学术头衔:
博士生导师
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学科领域:
物理化学
- 研究兴趣:非线性电化学动力学,光谱电化学,纳米电化学,生物电化学,电催化,金属电溶解等领域
李则林,厦门大学博士(1997),湖南大学博士后(1999-2001),浙江师范大学特聘教授,湖南师范大学博士生导师。主持国家自然科学基金3项(20673103,20373063,20073012),在美国物理化学(J. Phys. Chem. A & B)、英国化学通讯(Chem. Commun.)等著名学术刊物上发表论文40多篇,多次应邀在国际学术会议上作口头报告,“电化学振荡体系的普适判据”于2003年获浙江省高校科研成果二等奖。“非线性电化学与光谱电化学研究”于2004年获湖南省科技进步二等奖。“高师化学化工学生个性发展与创新人才培养的研究与实践”于2003年获湖南省教学成果二等奖。
研究兴趣涉及非线性电化学动力学,光谱电化学,纳米电化学,生物电化学,电催化,金属电溶解等领域。
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李则林, Wei Huang, a Zelin Li, *ab Youdi Peng b, Zhenjiang Niu a
Chem. Commun., 2004, 1380-1381,-0001,():
-1年11月30日
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【期刊论文】Chaos during the Reduction of Iodate in Alkaline Solution: Geometrical Effect of the Electrode
李则林, Zelin Li, *, † Jiale Cai, ‡ and Shaomin Zhou‡
J. Phys. Chem. B 1998, 102, 1539-1542,-0001,():
-1年11月30日
Geometrical effects on the oscillatory behavior during the reduction of iodate in an alkaline solution have been studied in detail. We have found that the geometrical factors greatly affect the oscillatory behavior when the iodate concentration is smaller, and chaos appears on the electrodes with smaller size or smoother surface, whereas at higher iodate concentration, the influence from the geometrical factors is minor and periodic behavior occurs instead, though some differences still exist in the waveforms with different roughness. The geometrical factors affect mainly the convection mass transfer of the iodate induced by the hydrogen evolution,in addition to the different adsorption.
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李则林, Z. L. Li, *, †, ‡ B. Ren, § X. M. Xiao, ‡ Y. Zeng, ‡ X. Chu, ‡ and Z. Q. Tian*, §
J. Phys. Chem. A 2002, 106, 6570-6573,-0001,():
-1年11月30日
In situ Raman spectroscopic studies, in combination with electrochemical measurements, further testify that the electrochemical reactions,i.e., iodate reduction and periodic hydrogen evolution, coupled with alternately predominant diffusion and convection mass transfer of iodate,account for the potential oscillation that appears under galvanostatic reduction of iodate over its limiting current in alkaline solution. The diffusion-limited depletion and the convection-enhanced replenishment of the iodate consist of a pair of positive and negative feedback steps between the bistable states (iodate reduction with and without hydrogen evolution). This mechanism is applicable to the same category of oscillators originating from such a coupling. The limiting diffusion concentration profile and the concentration variation of iodate in the diffusion layer during the oscillation by diffusion-limited depletion and by convection-enhanced replenishment through hydrogen evolution have been measured directly by using in situ Raman spectroscopy for the first time. A crossing cycle in the cyclic voltammogram that displays the bistability and the positive and negative feedbacks can be obtained only when the scan is reversed at a potential where hydrogen evolution takes place, and hydrogen evolution is thus mainly to induce the convection feedback of the reactant after its surface concentration depletes to zero by diffusion-limited reduction, rather than purely an additional current carrier. No oscillation can occur by simply removing the convection feedback with another pure current carrier instead of hydrogen evolution. The other model on the basis of negative differential resistance (NDR) fails to reflect the convection feedback step required for this category of oscillators.
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李则林, Z.L. Li a, c, *, Q.H. Yuan a, B. Ren b, X.M. Xiao a, Y. Zeng a, Z.Q. Tian b
Electrochemistry Communications 3(2001)654-658,-0001,():
-1年11月30日
We present new experimental evidence that further confirms that a combination of electrochemical reactions and diffusion-convection (ERDC) mass transfer accounts for the potential oscillations that appear under conditions of transport limited current. A typical example is given for the reduction of Fe(CN)^ in alkaline solution accompanying periodic hydrogen evolution. No potential oscillations occur by simply replacing the hydrogen evolution with I03" reduction as the second current carrier. That replacement removes only the convection mass transfer induced by the hydrogen evolution, and retains the negative differential resistance (NDR) from the Frumkin repulsive effect. The key role of hydrogen evolution is thus to restore the Fe(CN)e surface concentration after its depleting to zero by diffusion-limited reduction, rather than purely a second current carrier. Therefore, the other mechanism, which emphasizes the NDR from the Frumkin interaction due to electrostatic repulsion, is excluded because it does not have a direct connection with the oscillations. Moreover, a crossing cycle in cyclic voltammograms is a more convincible criterion for this category of electrochemical oscillators than the negative impedance
Fe(, CN), 3-6, IO-3, Reduction, Hydrogen evolution, Potential oscillations, Mechanism, Mass transfer, Crossing cycle, Negative impedance
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李则林, Z.L. Li a, b, *, Z.J. Niu a, T.H. Wu a, H.D. Nie b, X.M. Xiao b
Electrochemistry Communications 5(2003)297300,-0001,():
-1年11月30日
Electrochemical quartz crystal microbalance (EQCM) has been employed to study the potential oscillatory mechanism for the IO- 3 reduction accompanying periodic hydrogen evolution. The new experimental results that were obtained by in situ EQCM monitoring clearly demonstrate the all key steps involved in the oscillation: the diffusion-limited depletion of IO-3 by reduction, the formation, growth and departure of hydrogen bubbles on the surface, and the convection-induced replenishment of IO-3 by the hydrogen evolution. In addition to the frequency response to the surface mass change as reported in the literature, our study first shows that simultaneous frequency responses to the changes of density and viscosity in the diffusion layer during the oscillation can also provide meaningful and even decisive information on the oscillatory mechanism for the oscillators involving the coupling of electrochemical reactions with diffusion and convection mass transfer.
IO-3, Reduction, Hydrogen evolution, Potential oscillations, Mechanism
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李则林, Z.L. Li a, b, *, T.H. Wu a, Z.J. Niu a, W. Huang a, H.D. Nie b
Electrochemistry Communications 6(2004)44-48,-0001,():
-1年11月30日
Raman spectroscopy has been used for investigating the gold oscillatory electrodissolution processes in a 2 mol dm-3 HCl solution. The vibration bands for Au–Cl-, AuCl-4 and Au–O(H) as a function of potential, the spatial profile of AuCl-4 concentration in the diffusion layer, and the temporal evolution of AuCl-4 during the current oscillations have all been measured in situ by a confocal Raman spectroscope. These experimental results indicate that the transition between active and passive states of gold accounts for the current oscillations in a very narrow potential range. A crossing cycle in the cyclic voltammogram that means a pair of overlapping positive and negative feedbacks corresponds to the active–passive transition. A possible oscillatory electrodissolution mechanism has been proposed on the basis of the experimental results.
Gold electrodissolution, Cl-ions, Current oscillations, In situ Raman spectroscopy, Mechanism
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