The integration of micro-supercapacitors (mSCs) with flexible/wearable electronic devices can greatly advance their capabilities. However, developing these SCs as flexible and sustainable with high electrochemical performance, remains a challenge. Herein, electrochemically active nanomaterials are explored to formulate printable inks for the direct ink writing of flexible SCs. An activated carbon (AC)-based eco-friendly printable ink is prepared in deionized (DI) water using a bio-degradable cellulose-based, sodium carboxymethylcellulose (Na CMC), binder. Na CMC provides a stable ink dispersion with added mechanical and chemical stability to the printed SCs. The AC-Na CMC electrode produced a specific capacitance of 127.8 mF cm-2. AC-Na CMC ink is used to develop fully printed film and micro-SCs (m-SCs) using sodium sulphate (Na2SO4)/Na CMC as the polymer electrolyte. Using DIW enables scalable production, which is demonstrated by printing a flexible array of m-SCs to power a micro-LED. Use of Na CMC binder for the AC-based electrodes and photopaper as the substrate results in the production of biodegradable SCs. Additionally, developing the flexible m-SCs as transparent can expand their applicability to flexible transparent electronics. To achieve this, silver nanowires (Ag NWs) can be combined with various electrochemically active materials for the DIW of flexible and transparent m-SCs. Ag NWs and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) composite interdigitated electrodes are printed with an optical transparency of 84.6 % at 550 nm. The mSC shows excellent electrochemical stability over 10000 charge-discharge cycles along with excellent mechanical flexibility. An areal capacitance of 3.68 mF cm−2 is achieved in a voltage window of 1.2 V. Another active material, MXenes, will be further used to increase the capacitance of this Ag NWs-based transparent SC. This work will be extended to the development of a photo-supercapacitor, where a photo-active material will be deposited over the fabricated mSC.