Electrocatalytic hydrogenation is a competing reaction for hydrogen evolution that occurs in the presence of organic compounds containing unsaturated chemical bonds using water as the hydrogen donor. Here, we propose a simple method to synthesize amorphous Ta₂O₅ loaded amorphous Ru with poor crystallinity. The amorphous composite (Ta₂O₅/Ru-4.0-400) with an ultra-low Ru loading amount (2.16 wt%) exhibits 69.8% conversion of cinnamaldehyde with 29.1% FE and 100% selective formation of half-hydrogenated hydrocinnamaldehyde under a constant potential of −1.1 V vs. RHE for 5 h. Detailed experimental studies revealed that the amorphous structure with poor crystallinity offers structural flexibility and rich defects for electrochemical hydrogenation reactions, and the Ta₂O₅ substrate serves as a bridge to effectively facilitate electron transfer from Ru to CAL molecules. This work presents a new strategy for designing highly efficient electrocatalysts with an amorphous structure for the hydrogenation of organic compounds containing unsaturated chemical bonds.

中文翻译：

---

无定形 Ta2O5 负载 Ru 作为一种高效的电催化剂，用于以水为氢源的肉桂醛选择性加氢

电催化加氢是在含有不饱和化学键的有机化合物存在下发生的析氢竞争反应，使用水作为氢供体。在这里，我们提出了一种简单的方法来合成具有较差结晶度的非晶 Ta ₂ O ₅负载的非晶 Ru。具有超低 Ru 负载量 (2.16 wt%)的无定形复合材料 (Ta ₂ O ₅ /Ru-4.0-400) 在-1.1 V 的恒定电位vs.RHE 5 小时。详细的实验研究表明，结晶度差的无定形结构为电化学加氢反应提供了结构灵活性和丰富的缺陷，并且 Ta ₂ O ₅底物作为桥梁有效促进了电子从 Ru 到 CAL 分子的转移。这项工作为设计具有无定形结构的高效电催化剂提供了一种新策略，用于含不饱和化学键的有机化合物的氢化。