Nanocellulose has emerged as a highly promising and sustainable nanomaterial due to its unique structures, exceptional properties, and abundance in nature. In this comprehensive review, we delve into current research activities focused on harnessing the potential of nanocellulose for advanced electrochemical energy storage applications. We commence with a brief introduction to the structural features of cellulose nanofibers found within the cellulose resources’ cell walls. Subsequently, we explore various processes that have been investigated for utilizing cellulose in the realm of energy storage. In contrast to traditional binders, we place significant emphasis on the utilization of solid electrolytes and 3D printing techniques. Additionally, we examine different application areas, including supercapacitors, lithium-ion batteries, and Zn-ion batteries. Within this section, our primary focus lies in integrating nanocellulose with other active materials to develop flexible substrates such as films and aerogels. Lastly, we present our perspectives on several key areas that require further exploration in this dynamic research field in the future.

To lower the operating temperatures of solid oxide fuel cells (SOFCs), A new A-site-deficient Ti-doped SrCoO3-δ (SCT) are synthesized by a modified Pechini method and used as new highly active and stable cathode materials for intermediate-temperature SOFCs. The phase structure and electrical, thermal, and electrochemical properties of the SCT samples are evaluated. A phase transformation of SrCoO3-δ from hexagonal to cubic perovskite structure occurred at room temperature by the substitution of Ti. A lower TEC value of the SCT oxide was observed with increasing the Ti doped content and A-site deficiency. NiO-SDC-supported single cells with various SCT as cathode materials were operated at intermediate temperatures using humidified H2 as fuel and the static air as oxidant, respectively. Significant improved electrochemical performance for the A-site-deficient SCT sample was observed. An open-circuit potential of 0.83 V and the max power density of 745 mW cm-2 were achieved at 650 °C. The experimental results indicated that the A-site-deficient Sr0.95Co0.9Ti0.1O3-δ cubic perovskites are promising candidates as cathode materials for IT-SOFCs.