Laboratoire de Chimie des Processus Biologiques, CNRS UMR 8229, Collège de France, UPMC Univ Paris 06, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France.
Laboratoire de Chimie du Solide et Energie, UMR 8260, Collège de France, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France.
Angew Chem Int Ed Engl. 2017 Apr 18;56(17):4792-4796. doi: 10.1002/anie.201700388. Epub 2017 Apr 4.
To use water as the source of electrons for proton or CO reduction within electrocatalytic devices, catalysts are required for facilitating the proton-coupled multi-electron oxygen evolution reaction (OER, 2 H O→O +4 H +4 e ). These catalysts, ideally based on cheap and earth abundant metals, have to display high activity at low overpotential and good stability and selectivity. While numerous examples of Co, Mn, and Ni catalysts were recently reported for water oxidation, only few examples were reported using copper, despite promising efficiencies. A rationally designed nanostructured copper/copper oxide electrocatalyst for OER is presented. This material derives from conductive copper foam passivated by a copper oxide layer and further nanostructured by electrodeposition of CuO nanoparticles. The generated electrodes are highly efficient for catalyzing selective water oxidation to dioxygen with an overpotential of 290 mV at 10 mA cm in 1 m NaOH solution.
为了在电催化装置中利用水作为质子或 CO 还原的电子源，需要催化剂来促进质子耦合的多电子氧气析出反应（OER，2H2O→O2+4H++4e-）。这些催化剂理想情况下基于廉价且丰富的金属，必须在低过电势下表现出高活性、良好的稳定性和选择性。虽然最近有许多报道了用于水氧化的 Co、Mn 和 Ni 催化剂的例子，但尽管效率有很大的提升空间，仅报道了少数使用铜的例子。本文提出了一种用于 OER 的经过合理设计的纳米结构铜/氧化铜电催化剂。该材料源自被氧化铜层钝化的导电铜泡沫，并通过电沉积 CuO 纳米颗粒进一步纳米结构化。所生成的电极在 1m NaOH 溶液中以 10mAcm 的电流密度催化选择性水氧化生成氧气时，具有 290mV 的低过电势。
