Gao Zhaoyang, Tao Song, Zhu Lv, Chen Tsung-Yi, Min Huihua, Shen Xiaodong, Yang Hao, Chen Han-Yi, Wang Jin
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China.
Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 300044, Taiwan.
J Colloid Interface Sci. 2023 Nov;649:203-213. doi: 10.1016/j.jcis.2023.06.038. Epub 2023 Jun 10.
Dual-carbon engineering combines the advantages of graphite and hard carbon, thereby optimizing the potassium storage performance of carbon materials. However, dual-carbon engineering faces challenges balancing specific capacity, capability, and stability. In this study, we present a coordination engineering of Zn-N moieties on dual-carbon through additional P doping, which effectively modulates the symmetric charge distribution around the Zn center. Experimental results and theoretical calculations unveil that additional P doping induces an optimized electronic structure of the Zn-N moieties, thus enhancing K adsorption. A single-atom Zn metal coordinated with nitrogen and phosphorus reduces the K diffusion barrier and improves fast K migration kinetics. Consequently, Zn-NPC@rGO exhibits high reversible specific capacities, excellent rate capability, and impressive cycling stability, and remarkable power and energy densities for potassium-ion capacitors (PICs). This study provides insights into crucial factors for enhancing potassium storage performance.
双碳工程结合了石墨和硬碳的优点，从而优化了碳材料的钾存储性能。然而，双碳工程在平衡比容量、性能和稳定性方面面临挑战。在本研究中，我们通过额外的磷掺杂提出了一种在双碳上的锌-氮部分的配位工程，这有效地调节了锌中心周围的对称电荷分布。实验结果和理论计算表明，额外的磷掺杂诱导了锌-氮部分的优化电子结构，从而增强了钾吸附。与氮和磷配位的单原子锌金属降低了钾扩散势垒，改善了快速钾迁移动力学。因此，Zn-NPC@rGO对钾离子电容器（PIC）表现出高可逆比容量、优异的倍率性能、令人印象深刻的循环稳定性以及显著的功率和能量密度。本研究为增强钾存储性能的关键因素提供了见解。
