Physique de la Matière Condensée, École Polytechnique, CNRS, 91128 Palaiseau, France.
J Am Chem Soc. 2011 Feb 2;133(4):762-4. doi: 10.1021/ja109295x.
Recent advances in bioelectrochemistry came from the elaboration of conducting electrodes modified by an organic layer onto which nanoparticles are adsorbed. Self-assembled monolayers on noble-metal electrodes are known to hinder the electrochemical kinetics of fast-transfer redox systems. Surprisingly, fast kinetics are recovered when metal nanoparticles are deposited on top of the monolayer. We show that this surprising behavior can be fully accounted for when realizing that electron transfer from metal to metal is intrinsically easier than transfer between metal and redox system by many orders of magnitude.
生物电化学的最新进展来自于对通过有机层修饰的导电电极的精心研究，该有机层吸附了纳米粒子。众所周知，贵金属电极上的自组装单分子层会阻碍快速转移氧化还原体系的电化学动力学。令人惊讶的是，当金属纳米粒子沉积在单层的顶部时，快速动力学会恢复。我们表明，当意识到金属到金属的电子转移本质上比金属和氧化还原体系之间的转移容易几个数量级时，就可以完全解释这种令人惊讶的行为。
