An Efficient Tri-Conductive Electrode for Ethane Direct Electrochemical Dehydrogenation on Proton Ceramic Electrolysis Cells

Abstract

The preparation of ethylene from ethane, a main component of shale gas, has become an important process of the petrochemical industry, using ethane steam cracking at high temperatures (>900 °C), which is a highly energy intensive industry. Here, direct dehydrogenation of ethane is engineered electrochemically to produce ethylene and hydrogen in a proton-conducting electrolysis cell, achieving over 50% ethane conversion and 90.42% ethylene selectivity at 700 °C. On the basis of constructing NiCu bimetallic alloy nano-catalyst on the surface of perovskite Sr₃Fe₂O₇, Hafnium (Hf) element is doped in the bulk phase to improve proton conductivity, establish triple conductivity, and achieve efficient directional conversion of ethane. The carbon dioxide reduction reaction at the cathode is further coupled, resulting in a higher conversion of ethane on the anode side and the production of syngas on the cathode side. This electrochemical reaction process provides a choice for the clean production of high value-added small molecule chemical products.