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Electrochemical promotion of copper nanoparticles for the reverse water gas shift reaction

机译：电化学促进铜纳米颗粒以反向水气体转移反应

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摘要

Electrochemical promotion of catalysis (EPOC) is one of the promising ways to in situ control and enhance catalytic processes of the reverse water gas shift reaction (RWGS), which recycles carbon dioxide (CO2) into carbon monoxide (CO). In EPOC, a metal catalyst is deposited on a solid electrolyte that under polarization supplies ions (O2−, H+, Na+, etc.) towards the catalyst surface, leading to the alteration of the catalyst work function, and as a result its catalytic performance. In this study, the catalytic activity and EPOC of copper (Cu) nanoparticles (NPs), an inexpensive metal, are presented and show to be better than those of other non-noble metals, such as iron (Fe) and cobalt (Co). Through characterizations like SEM, STEM and XPS, the change from lower oxidized state to higher oxidized state of copper catalyst before and after reaction is confirmed, and Cu2O and metallic copper are taken as the active states. It is found that the EPOC only occur under positive polarizations and vary significantly under different reaction conditions, indicating that the RWGS reaction over Cu NPs deposited on yttria-stabilized zirconia (YSZ) follows the redox mechanism. The highest electrochemical promotion of Cu NPs occurs under an application of +2 V and CO2 : H2 ratio of 1 : 1 at 400 °C with an enhancement ratio (ρ) of 1.2 and apparent faradaic efficiency (Λ) of 6.52.
机译：电化学促进催化（EPOC）是原位控制并增强反水气移反应（RWGS）的催化过程的有希望的方法，该方法将二氧化碳（CO2）回收到一氧化碳（CO）中。在EPOC中，金属催化剂沉积在固体电解质上，在极化下，将离子（O2-，H+，Na+等）朝向催化剂表面，从而导致催化剂功能的改变，并因此其催化性能。在这项研究中，提出了廉价金属的铜（CU）纳米颗粒（NP）的催化活性和EPOC，并且表现出比其他非差异金属（例如铁（FE）和钴（CO）等其他非差异金属的催化活性和EPOC。 。通过SEM，STEM和XPS等表征，确认反应之前和之后从下氧化态到较高的铜催化剂氧化态的变化，并将Cu2O和金属铜作为活性状态。发现该EPOC仅在阳性极化下发生，在不同的反应条件下显着变化，表明沉积在Yttria稳定的氧化锆（YSZ）上的Cu NP上的RWGS反应遵循了氧化还原机制。 Cu NP的最高电化学促进发生在400°C时的+2 V和CO2：H2比率为1：1的情况下，增强比（ρ）为1.2，而明显的Faradaic效率（λ）为6.52。

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