Evers Mathies V, Bernal Miguel, Roldan Cuenya Beatriz, Tschulik Kristina
Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Chair of Analytical Chemistry II, 44801, Bochum, Germany.
Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195, Berlin, Germany.
Angew Chem Int Ed Engl. 2019 Jun 11;58(24):8221-8225. doi: 10.1002/anie.201813993. Epub 2019 May 15.
The impact of individual HAuCl nanoreactors is measured electrochemically, which provides operando insights and precise control over the modification of electrodes with functional nanoparticles of well-defined size. Uniformly sized micelles are loaded with a dissolved metal salt. These solution-phase precursor entities are then reduced electrochemically-one by one-to form nanoparticles (NPs). The charge transferred during the reduction of each micelle is measured individually and allows operando sizing of each of the formed nanoparticles. Thus, particles of known number and sizes can be deposited homogenously even on nonplanar electrodes. This is demonstrated for the decoration of cylindrical carbon fibre electrodes with 25±7 nm sized Au particles from HAuCl -filled micelles. These Au NP-decorated electrodes show great catalyst performance for ORR (oxygen reduction reaction) already at low catalyst loadings. Hence, collisions of individual precursor-filled nanocontainers are presented as a new route to nanoparticle-modified electrodes with high catalyst utilization.
通过电化学方法测量单个氯金酸纳米反应器的影响，这能提供原位见解并对用尺寸明确的功能性纳米颗粒修饰电极进行精确控制。尺寸均匀的胶束负载有溶解的金属盐。然后将这些溶液相前驱体实体逐个进行电化学还原以形成纳米颗粒（NP）。在每个胶束还原过程中转移的电荷被单独测量，从而可以对每个形成的纳米颗粒进行原位尺寸测定。因此，即使在非平面电极上，已知数量和尺寸的颗粒也能均匀沉积。用填充有氯金酸的胶束制备尺寸为25±7纳米的金颗粒来修饰圆柱形碳纤维电极就证明了这一点。这些金纳米颗粒修饰的电极在低催化剂负载量下就已对氧还原反应（ORR）表现出优异的催化性能。因此，单个填充前驱体的纳米容器的碰撞被视为一种获得高催化剂利用率的纳米颗粒修饰电极的新途径。
