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WO3 Rich in Oxygen Vacancies Through Ion‐Exchange Reaction for Enhanced Electrocatalytic N2 Reduction to NH3
ChemCatChem ( IF 3.8 ) Pub Date : 2020-11-27 , DOI: 10.1002/cctc.202001769 Junbo Zhang 1 , Cheng Jiang 1 , Yanqiu Du 1 , Lei Sheng 1 , Xianli Huang 1 , Tao Wang 1 , Jianping He 1
ChemCatChem ( IF 3.8 ) Pub Date : 2020-11-27 , DOI: 10.1002/cctc.202001769 Junbo Zhang 1 , Cheng Jiang 1 , Yanqiu Du 1 , Lei Sheng 1 , Xianli Huang 1 , Tao Wang 1 , Jianping He 1
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Electrochemical route is an admirable strategy for N2 fixation to NH3, which can save more energy and reduce greenhouse gas emissions compared with the Haber‐Bosch process. However, it still suffers from extremely low ammonia yield for the lack of effective electrocatalysts and shows low Faraday efficiency due to competitive hydrogen evolution reaction (HER). Herein, we firstly synthesized needle‐like K0.33WO3.16 (K‐WO3) by molten salt method, then K0.33WO3.16 with surface defect structure (WO3‐OV) was successfully obtained through ion‐exchange of H+ and dehydration process. An obvious absorption enhancement in the near infrared region exhibited in UV‐vis absorption spectra and a significant ESR signal at g=2.003 proves the existence of O vacancies. The abundant oxygen vacancies ensure that Faraday efficiency of WO3‐OV gets improved to 25.45 % at −0.3 V (vs RHE), much superior to K‐WO3 (FE: 9.33 %). It is worth noting that defect‐rich WO3‐OV also shows high electrochemical stability.
中文翻译：
通过离子交换反应富含氧空位的WO3，以增强电催化将N2还原为NH3
电化学途径是将N 2固定到NH 3的一种令人钦佩的策略，与Haber-Bosch工艺相比，它可以节省更多能量并减少温室气体排放。然而，由于缺乏有效的电催化剂，其氨产量仍然极低，并且由于竞争性的析氢反应（HER）而显示出低的法拉第效率。在这里，我们首先通过熔融盐法合成了针状的K 0.33 WO 3.16（K‐WO 3），然后通过H +的离子交换成功获得了具有表面缺陷结构的K 0.33 WO 3.16（WO 3－OV）。和脱水过程。UV-vis吸收光谱中显示的在近红外区域有明显的吸收增强，并且在g = 2.003时有明显的ESR信号证明存在O空位。充足的氧空位确保WO 3-- OV的法拉第效率在-0.3 V（vs RHE）时提高到25.45％，远优于K-WO 3（FE：9.33％）。值得注意的是，富含缺陷的WO 3 -OV也显示出很高的电化学稳定性。
更新日期：2020-11-27
中文翻译：
通过离子交换反应富含氧空位的WO3，以增强电催化将N2还原为NH3
电化学途径是将N 2固定到NH 3的一种令人钦佩的策略，与Haber-Bosch工艺相比，它可以节省更多能量并减少温室气体排放。然而，由于缺乏有效的电催化剂，其氨产量仍然极低，并且由于竞争性的析氢反应（HER）而显示出低的法拉第效率。在这里，我们首先通过熔融盐法合成了针状的K 0.33 WO 3.16（K‐WO 3），然后通过H +的离子交换成功获得了具有表面缺陷结构的K 0.33 WO 3.16（WO 3－OV）。和脱水过程。UV-vis吸收光谱中显示的在近红外区域有明显的吸收增强，并且在g = 2.003时有明显的ESR信号证明存在O空位。充足的氧空位确保WO 3-- OV的法拉第效率在-0.3 V（vs RHE）时提高到25.45％，远优于K-WO 3（FE：9.33％）。值得注意的是，富含缺陷的WO 3 -OV也显示出很高的电化学稳定性。
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