**4. Conclusion**

In summary, the supercapacitive behavior of sputter-deposited columnar-type cubic CrN-coated working electrode was tested. The CrN working electrode shows high specific capacitance of 41.6 F/g in 1 M Na2SO4 at the scan rate of 5 mV/s with the excellent capacitance retention (87% after 2000 cycles). These good electrochemical properties demonstrated that the CrN-based supercapacitor electrode has excellent potential in supercapacitor applications.
