孔令兵教授与西安交通大学合作以共同通讯作者及我校为第二单位在英国皇家化学学会重要期刊发表关于超级电容器材料方面进展的论文，“Surface Nitrogen-Modified 2D Titanium Carbide (MXene) with High Energy Density for Aqueous Supercapacitor Applications, Journal of Materials Chemistry A, 7, 5416-5425 (2019)”。报导了一种氮表面改性方法提高用于超级电容器的二维材料MXene的能量密度。

Nitrogen related functional groups have been introduced to modify the surface characteristics of Ti₃C₂T_x, in order to increase the electron conduction and energy storage capacity. Experimental results have shown that the presence of the items, such as -NH₂, Ti-O-N and O-Ti-N, could offer a synergistic effect on the electrochemical performance of SCs, which was mainly attributed to the intercalation-pseudocapacitance contribution according to the quantitative analysis. Furthermore, the role of O-Ti-N is more significant than that of Ti-O-N. Specifically, for the first time, we demonstrate that electrodes based on the N surface modified Ti₃C₂T_x film display largely enhanced electrochemical performances, with gravimetric capacitance of 415.0 F g^-1 at 2 mV s^-1, rate capacity of 75.9% at 200 mV s^-1 and cycling stability of above 90% retention after 18 000 cycles.