Hwang Seon Young, Jang Hye Ji, Kim Young Jun, Maeng Ju Young, Park Go Eun, Yang Seo Young, Rhee Choong Kyun, Sohn Youngku
Department of Chemistry, Chungnam National University, Daejeon 34134, Korea.
Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea.
Nanomaterials (Basel). 2022 Aug 11;12(16):2758. doi: 10.3390/nano12162758.
V-Zn hybrids have widely been used as catalyst materials in the environment and as energy. Herein, V-Zn hybrid electrodes were prepared by the hydrothermal and sputter-deposition methods using a Zn foil support. Their electrocatalytic CO reduction (EC CO RR) performances were tested under various applied potentials, different electrolytes, and concentrations before and after thermal treatment of the demonstrated electrode. Gas and liquid products were confirmed by gas chromatography and nuclear magnetic resonance spectroscopy, respectively. For V-Zn electrode by hydrothermal method produced mainly syngas (CO and H) with tunable ratio by varying applied potential. Minor products include CH, CH, and CH. A liquid product of formate showed a Faradaic efficiency (FE) of 2%. EC CO RR efficiency for CO, CH, and formate was best in 0.2 M KHCO electrolyte condition. CO and formate were further increased by photoirradiation and Nafion-treated electrode. Formate and CH productions were significantly increased by thermal treatment of the V-Zn electrode. CO production was diminished for the V-Zn electrode by sputter deposition but was recovered by thermal treatment. Photocatalytic CO RR was tested to find that RR products include CHOH, CO, CH, CH, and CH. Interestingly long-chain hydrocarbons (CH and CH, where n = 3-6) were first observed under mild conditions. The long-chain formation was understood by Fisher-Tropsch (F-T) synthesis. Alkenes were observed to be more produced than alkanes unlike in the conventional F-T synthesis. The present new findings provide useful clues for the development of hybrid electro-and photo-catalysts tested under various experimental conditions in energy and environment.
钒-锌杂化物已被广泛用作环境和能源领域的催化剂材料。在此，使用锌箔载体通过水热法和溅射沉积法制备了钒-锌混合电极。在对所示电极进行热处理之前和之后，在各种施加电位、不同电解质和浓度下测试了它们的电催化CO还原（EC CO RR）性能。分别通过气相色谱和核磁共振光谱确认了气体和液体产物。对于通过水热法制备的钒-锌电极，通过改变施加电位主要产生合成气（CO和H），其比例可调。次要产物包括CH、CH和CH。甲酸盐液体产物的法拉第效率（FE）为2%。在0.2 M KHCO电解质条件下，CO、CH和甲酸盐的EC CO RR效率最佳。光照射和经Nafion处理的电极使CO和甲酸盐进一步增加。对钒-锌电极进行热处理后，甲酸盐和CH的产量显著增加。通过溅射沉积制备的钒-锌电极的CO产量减少，但通过热处理得以恢复。测试了光催化CO RR，发现RR产物包括CHOH、CO、CH、CH和CH。有趣的是，在温和条件下首次观察到长链烃（CH和CH，其中n = 3-6）。通过费托（F-T）合成理解了长链的形成。与传统的F-T合成不同，观察到烯烃的产量比烷烃更多。目前的新发现为在能源和环境领域的各种实验条件下测试的混合电催化剂和光催化剂的开发提供了有用的线索。
