Junqueira João R C, O'Mara Peter B, Wilde Patrick, Dieckhöfer Stefan, Benedetti Tania M, Andronescu Corina, Tilley Richard D, Gooding J Justin, Schuhmann Wolfgang
Analytical Chemistry - Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr-Universität Bochum Universitätsstraße 150 D-44780 Bochum Germany.
School of Chemistry and Australian Centre for NanoMedicine University of New South Wales Sydney 2052 Australia.
ChemElectroChem. 2021 Dec 13;8(24):4848-4853. doi: 10.1002/celc.202100906. Epub 2021 Dec 23.
Bimetallic silver-copper electrocatalysts are promising materials for electrochemical CO reduction reaction (CORR) to fuels and multi-carbon molecules. Here, we combine Ag core/porous Cu shell particles, which entrap reaction intermediates and thus facilitate the formation of C products at low overpotentials, with gas diffusion electrodes (GDE). Mass transport plays a crucial role in the product selectivity in CORR. Conventional H-cell configurations suffer from limited CO diffusion to the reaction zone, thus decreasing the rate of the CORR. In contrast, in the case of GDE-based cells, the CORR takes place under enhanced mass transport conditions. Hence, investigation of the Ag core/porous Cu shell particles at the same potentials under different mass transport regimes reveals: (i) a variation of product distribution including C products, and (ii) a significant change in the local OH activity under operation.
双金属银铜电催化剂是用于将电化学CO还原反应（CORR）转化为燃料和多碳分子的有前景的材料。在这里，我们将Ag核/多孔Cu壳颗粒与气体扩散电极（GDE）相结合，Ag核/多孔Cu壳颗粒能够捕获反应中间体，从而在低过电位下促进C产物的形成。传质在CORR的产物选择性中起着关键作用。传统的H型电池配置存在CO向反应区扩散受限的问题，从而降低了CORR的速率。相比之下，在基于GDE的电池中，CORR在增强的传质条件下发生。因此，在不同传质条件下研究相同电位下的Ag核/多孔Cu壳颗粒揭示了：（i）包括C产物在内的产物分布变化，以及（ii）运行过程中局部OH活性的显著变化。
