This symposium will cover recent advances of two-dimensional (2D) materials and vdW heterostructures for energy conversion applications. The symposium consists of two parts, i.e., catalytic energy conversion, and other forms of energy conversion including photothermal, piezoelectric, electrical-magnetic, thermochemical, biochemical etc. The first part of the symposium will focus on the catalysis application of 2D materials in photochemical, electrochemical, and photoelectrochemical reactions. Symposium contribution should cover the recent development of new 2D catalysts for water electrolysis, carbon dioxide/nitrate reduction, nitrogen fixation, polysulfide conversion, biomass reforming etc. Discussion of mechanistic investigation of the reaction principles using in-situ/operando characterization and/or atomistic modelling of 2D catalysis are also welcomed. Discussion of large-scale synthesis, fabrication, other scaling-up breakthrough, and modelling challenges on both atomistic level and device level are also welcomed. The second part of the symposium will focus on other types of energy conversion including but not limited to photothermal (such as phototherapy and solar-to-heat), thermoelectric (thermal-to-electric), piezoelectric (mechanical-to-electric), electromagnetic (e.g., magnetic 2D materials), thermochemical (e.g., olefin conversion), and biochemical catalysis. Symposium contribution should cover the recent advances of new 2D materials, device configuration, and scientific understanding of the role of 2D materials in these energy conversion process. Reports on emerging energy conversion applications of new 2D materials are also welcomed.