S1 Supporting information for Asymmetric Supercapacitors with Nanostructured RuS 2 Ankit Kumar, 1, Debanjan Das, 2, Debasish Sarkar, 3, * Karuna Kar Nanda, 2 Satish Patil, 1 and Ashok Shukla 1, * 1 Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru-560012, India 2 Materials Research Centre, Indian Institute of Science, Bengaluru-560012, India 3 Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan-302017, India  Authors contributed equally to this work. E-mail: debasish.phy@mnit.ac.in; deb.sarkar1985@gmail.com; akshukla2006@gmail.com Calculations for Charge-balance before assembling the ASC We know, Q = Capacitance (F)  active mass (m)  potential window (V) For balancing charges in positive and negative electrode materials, Q + (RuS 2 ) = Q - (Carbon) which results, 1.66 F  m 1  1V = 1.77 F  m 2  1V Or, m 1 /m 2 = 1/0.94 (calculated) Accordingly, the area ratio between positive and negative electrodes is taken to be 1:1 Calculation of capacitance, energy and power densities for single electrode and ASC cell Areal capacitance (C a , mF/cm 2 ) was calculated from the Cyclic voltammogram data using the equation: (1) 2 a idt C aV    where, i (mA) is the cathodic or anodic current; dt (s) is the time differential, ΔV (V) be the potential window, and a (cm 2 ) is the effective area of the individual redox active materials for single electrode measurements. Gravimetric capacitance (C g , F/g) calculated using the same