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Controllable CO2 electroreduction to pure syngas and ethanol on CuZn-LDH surface with tunable intermediates affinity
Ist Teil von
International journal of hydrogen energy, 2024-03, Vol.60, p.976-984
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Electrochemical CO2 reduction (ECR) towards pure syngas (CO/H2 = 0.33–3.3) and ethanol as single gas-liquid products is highly desirable and challenging, which could achieve maximized CO2 utilization and avoid subsequent separation and purification processes. Herein, a series of Cu/Zn layered double hydroxides (CuZn-LDHs) nanosheets with various Cu/Zn ratios were fabricated for ECR to produce pure syngas and ethanol. The formation of uniformly dispersed Cu/Zn sites in CuZn-LDHs finely modulated the adsorption strength of *CO2•−and *H intermediates. Combined with the large electrochemical active surface area (ECSA) and small charge transfer resistance, the obtained optimal Cu3Zn3-LDH catalyst with appropriate *CO2•− and *H binding affinity exhibited high Faraday efficiency (FE) for pure syngas (74.7%) and ethanol (15.0 %). Notably, the Cu3Zn3-LDH showed a good durability with a FE of 82.1% for 5 h at −1.25 V vs RHE. This work put forward a promising candidate of LDHs-based electrocatalysts for ECR to prepare single gas-liquid products.
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•CuZn-LDHs electrocatalysts are developed for ECR to single gas-liquid products.•The *CO2•− and *H affinity of catalyst can be modulated by tailoring Cu/Zn ratio.•The ECR products of Cu3Zn3-LDH are pure syngas and ethanol.•Cu3Zn3-LDH showed a good durability for syngas production (FE = 82.1%) within 5 h.