超级电容器
石墨烯
氧化物
材料科学
碳化
磷化物
电化学
化学工程
镍
电解质
过渡金属
金属有机骨架
无机化学
纳米技术
电极
化学
催化作用
有机化学
冶金
物理化学
复合材料
吸附
工程类
扫描电子显微镜
作者
Hang Wang,Longyu Wang,Zhao Peng,Xingmao Zhang,Xiaolong Lu,Zhipeng Qiu,Bin Qi,Ru‐Xin Yao,Yichao Huang,Lin Wang,Tong Wei,Zhuangjun Fan
标识
DOI:10.1016/j.jcis.2023.06.125
摘要
Transition metal phosphides (TMPs) with unique metalloid features have been promised great application potential in developing high-efficiency electrode materials for electrochemical energy storage. Nevertheless, sluggish ion transportation and poor cycling stability are the critical hurdles limiting their application prospects. Herein, we presented the metal-organic framework-mediated construction of ultrafine Ni2P immobilized in reduced graphene oxide (rGO). Nano-porous two-dimensional (2D) Ni-metal-organic framework (Ni-MOF) was grown on holey graphene oxide (Ni(BDC)-HGO), followed by MOF-mediated tandem pyrolysis (carbonization and phosphidation; Ni(BDC)-HGO-X-P, X denoted carbonization temperature and P represented phosphidation). Structural analysis revealed that the open-framework structure in Ni(BDC)-HGO-X-Ps had endowed them with excellent ion conductivity. The Ni2P wrapped by carbon shells and the PO bonds linking between Ni2P and rGO ensured the better structural stability of Ni(BDC)-HGO-X-Ps. The resulting Ni(BDC)-HGO-400-P delivered a capacitance of 2333.3 F g−1 at 1 A g−1 in a 6 M KOH aqueous electrolyte. More importantly, Ni(BDC)-HGO-400-P//activated carbon, the assembled asymmetric supercapacitor with an energy density of 64.5 Wh kg−1 and a power density of 31.7 kW kg−1, almost maintained its initial capacitance after 10,000 cycles. Furthermore, in situ electrochemical-Raman measurements were exploited to demonstrate the electrochemical changes of Ni(BDC)-HGO-400-P throughout the charging and discharging processes. This study has further shed light on the design rationality of TMPs for optimizing supercapacitor performance.
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