全部利用太阳能作能源，以CO2资源化和氢能利用为目的，建立CO2/H2O制取合成气的STEP过程，高效地将CO2/H2O耦合分解成CO/H2制取合成气。主要研究内容是同时利用太阳能光热和光电效应，通过高温电解将环境稳定分子（CO2/H2O）还原成含能物质（CO/H2），其核心是CO2/H2O的高温电解还原。具体内容是通过太阳能分解稳定分子制含能物质的基本原理和理论研究，给出太阳能驱动CO2/H2O耦合分解的STEP系统理论框架和基础(理论与过程)；利用能级、光谱、电势等完美匹配耦合原则，调控构建高效集成耦合型太阳能-CO2/H2O-CO/H2系统，将CO2/H2O还原成CO和H2，并形成CO2/H2O利用STEP过程模型化和集成化工艺流程。系统太阳能利用总效率高于60%，系统CO2/H2O-CO/H2转化效率高于25%，构成完美、可持续的太阳能-CO2/H2O-合成气耦合循环。

Carbon dioxide(CO2) is the most important greenhouse gas released by human activities, and its thermodynamic stability makes its activation energy demanding and challenging. For the purpose of CO2 resource recovery and hydrogen utilization, new reforming technology of CO2/H2O will be developed in the solar thermal electrochemical process(STEP) where syngas(CO and H2) can be generated from hybrid water splitting and CO2 decomposition driven by solar energy efficiently. The main research is to utilize the solar-thermal and photo-electrical effect to deoxidize stable molecules (CO2/H2O) by electrolysis into energetic material (C or CO and H2) at high temperature. The key problem of reforming technology is to study electrolysis reduction of CO2/H2O at high temperature. Based on the keystone and theoretical study of solar energy decompose stable molecules to make energetic materials, the theoretical framework and foundation(theory and process of STEP) of hybrid CO2/H2O system decomposition driven by solar energy will be established. The experiments of CO2/H2O electrolysis and STEP will be conducted by taking advantage of the perfect matching coupled principle of energy level, spectrum, potential which can build highly effective integrating coupled solar-CO2/H2O-CO/H2 system to deoxidize the hybrid CO2/H2O to syngas(CO/H2). Hence, new modeled and integrated reforming technology of CO2/H2O for syngas can be developed through STEP. With an efficiency of solar energy conversion more than 60%, the conversion efficiency of CO2/H2O-CO/H2 is over 25%, where a perfect and sustainable solar-CO2/H2O-syngas coupled cycle generated.