Achieving Multiple and Tunable Ratios of Syngas to Meet Various Downstream Industrial Processes

Electrochemical reduction of carbon dioxide (CO2) to syngas is one of the most promising routes to realize industrialization without additional separation issues. To achieve this, where the H2/CO ratio in syngas changes in a wide range to further meet various downstream industrial processes, a highly efficient catalyst is concerned and required. Here, we introduce a series of CuZIF and their derived carbon catalysts to adjust the H2/CO ratio in syngas to meet the requirements of downstream processes in industry. The carbonization temperature for CuZIF is correlated with the CO2 adsorption ability, the local concentration of CO2, and mass transport. The current density reaches up to 7.91 mA cm–2 at −1.2 VRHE, corresponding to the enhanced production rate of the syngas. Furthermore, with copper doping, the carbon yield of samples has also been improved significantly, up to ∼30%. Remarkably, the as-produced H2/CO ratio of syngas can be adjusted in a wide range of 0.5–3 to satisfy different downstream processes at a potential of −1.5 VRHE by controlling the carbonization temperature of CuZIF.