Zhang Bianli, Qian Xingyue, Xu Hui, Jiang Lin, Xia Jiawei, Chen Haiqun, He Guangyu
Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu 213164, China.
Nanoscale. 2023 Oct 12;15(39):16199-16208. doi: 10.1039/d3nr03609j.
The coordination of the electronic structure and charge transfer through heteroatomic doping and sulfur vacancies is one of the most vital strategies for enhancing the electrocatalytic performance of the oxygen and hydrogen evolution reactions (OER, HER) through water splitting. Se-doped CuCoS nanosheets (CuCoSSe) with abundant sulfur vacancies were synthesized a simple hydrothermal method to achieve remarkably efficient electrocatalytic water splitting. Importantly, incorporating Se in three-dimensional nanosheet structures effectively fine-tunes the electronic structure, ensuring ample accessibility of active sites for swift charge carrier transfer and improved reaction kinetics. The optimized CuCoSSe offers substantially high electrocatalytic activity with overpotentials of 65 and 230 mV at the current density of 10 mA cm for HER and OER, respectively, which is comparable to commercial catalysts. Combining Se-doping and rich sulfur vacancies facilitates fast charge transport, thus significantly boosting the electrocatalytic activity. Furthermore, utilizing CuCoSSe as both the cathode and anode, a two-electrode electrolyser exhibits remarkable performance. It achieves a low voltage of 1.52 V at 10 mA cm and demonstrates exceptional durability over time. This study investigates the significance of doping and vacancies in enhancing electrocatalytic activity for water splitting.
通过杂原子掺杂和硫空位来协调电子结构和电荷转移，是通过水分解提高析氧反应（OER）和析氢反应（HER）电催化性能的最重要策略之一。采用简单的水热法合成了具有丰富硫空位的硒掺杂铜钴硫化物纳米片（CuCoSSe），以实现高效的电催化水分解。重要的是，在三维纳米片结构中引入硒有效地微调了电子结构，确保活性位点有足够的可及性，以实现快速的电荷载流子转移并改善反应动力学。优化后的CuCoSSe具有很高的电催化活性，在析氢反应和析氧反应中，电流密度为10 mA cm时的过电位分别为65和230 mV，与商业催化剂相当。硒掺杂和丰富的硫空位相结合促进了快速电荷传输，从而显著提高了电催化活性。此外，将CuCoSSe用作阴极和阳极，双电极电解槽表现出卓越的性能。在10 mA cm时实现了1.52 V的低电压，并随着时间的推移表现出出色的耐久性。本研究探讨了掺杂和空位对提高水分解电催化活性的重要性。
