School of Electronic Science and Engineering, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Nanjing University, Nanjing 210000, China.
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China.
ACS Appl Mater Interfaces. 2023 Feb 15;15(6):8200-8207. doi: 10.1021/acsami.2c21953. Epub 2023 Feb 3.
Developing a bifunctional electrocatalyst with remarkable performance viable for overall water splitting is increasingly essential for industrial-scale renewable energy conversion. However, the current electrocatalyst still requires a large cell voltage to drive water splitting due to the unsuitable adsorption/desorption capacity of reaction intermediates, which seriously hinders the practical application of water splitting. Herein, a unique SiO/Ru nanosheet (NS) material was proposed as a high-performance electrocatalyst for overall water splitting. The SiO/Ru NSs show superior performance in the hydrogen evolution reaction with a low overpotential of 23 mV (@ 10 mA cm) and excellent stability for nearly 200 h (@ 10 mA cm) in 1 M KOH. By means of the introduction of SiO, it is beneficial for balancing the local charge density of the surrounding Ru sites. The suitable electronic coupling between the d-band electrons of Ru and the adsorbed species effectively balances the adsorption and desorption of reaction intermediates on the surface. As a result, the catalyst also exhibits overall water splitting activity with a cell voltage of only 1.496 V to reach the current density of 10 mA cm. The present work opens up a new strategy for designing high-performance electrocatalysts for water splitting.
开发具有显著性能的双功能电催化剂，对于工业规模的可再生能源转化来说越来越重要。然而，由于反应中间体的吸附/解吸能力不合适，当前的电催化剂仍然需要较大的电池电压来驱动水分解，这严重阻碍了水分解的实际应用。在此，提出了一种独特的 SiO/Ru 纳米片（NS）材料作为整体水分解的高性能电催化剂。SiO/Ru NS 在析氢反应中表现出优异的性能，在 1 M KOH 中，其过电势低至 23 mV（@10 mA cm），稳定性接近 200 h（@10 mA cm）。通过引入 SiO，有利于平衡周围 Ru 位点的局部电荷密度。Ru 的 d 带电子和吸附物种之间的合适电子耦合有效地平衡了反应中间体在表面的吸附和解吸。因此，该催化剂还表现出整体水分解活性，仅需 1.496 V 的电池电压即可达到 10 mA cm 的电流密度。本工作为设计用于水分解的高性能电催化剂开辟了一条新的策略。
