Kim Jaehoon, Song Jun Tae, Oh Jihun
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, South Korea.
Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
J Chem Phys. 2020 Aug 7;153(5):054702. doi: 10.1063/5.0009340.
Electrochemical CO production from CO electrolysis has been considered the most economically viable approach among various candidate products. AuCu bimetallic alloys are currently receiving attention for their potential to tailor catalytic activity. Here, we synthesized a dilute AuCu alloy nanostructure with an AuCu atomic composition ratio of 3% by using a simple electrochemical treatment method on a 200 nm-thick Au thin film. The dilute AuCu alloy catalyst shows an exceptional CO reduction activity in terms of selectivity and overpotential for CO production. In addition, the stability property is more significantly enhanced as compared to pure Au nanostructures. In addition, we describe an in situ tailoring method of catalytic activity for Au nanostructures by repeating an electrochemical treatment process that is performed for forming the Au nanostructure. This approach will be a promising and facile strategy not only for reactive Au catalysts but also to increase the stability activity simultaneously by utilizing Cu impurities existing in an aqueous electrolyte for CO reduction.
在各种候选产品中，通过CO电解进行电化学CO生产被认为是最具经济可行性的方法。AuCu双金属合金因其调整催化活性的潜力而受到关注。在此，我们通过在200nm厚的Au薄膜上采用简单的电化学处理方法，合成了AuCu原子组成比为3%的稀AuCu合金纳米结构。稀AuCu合金催化剂在CO生产的选择性和过电位方面表现出优异的CO还原活性。此外，与纯Au纳米结构相比，其稳定性得到了更显著的增强。此外，我们描述了一种通过重复用于形成Au纳米结构的电化学处理过程来原位调整Au纳米结构催化活性的方法。这种方法不仅对于活性Au催化剂将是一种有前途且简便的策略，而且还可以通过利用水性电解质中存在的Cu杂质同时提高稳定性活性以用于CO还原。
