Zahid Anum, Shah Afzal, Shah Iltaf
Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Department of Chemistry, PMAS Arid Agriculture University, Rawalpindi 46300, Pakistan.
Nanomaterials (Basel). 2022 Apr 18;12(8):1380. doi: 10.3390/nano12081380.
The electrochemical reduction of carbon dioxide (CO) on copper electrode derived from cupric oxide (CuO), named oxide derived copper (ODCu), was studied thoroughly in the potential range of -1.0 V to -1.5 V versus RHE. The CuO nanoparticles were prepared by the hydrothermal method. The ODCu electrode was used for carbon dioxide reduction and the results revealed that this electrode is highly selective for C products with enhanced current density at significantly less overpotential. This catalyst shifts the selectivity towards C products with the highest Faradaic efficiency up to 58% at -0.95 V. In addition, C product formation at the lowest onset potential of -0.1 V is achieved with the proposed catalyst. X-ray diffraction and scanning electron microscopy revealed the reduction of CuO to Cu (111) nanoparticles during the CO RR. The intrinsic property of the synthesized catalyst and its surface reduction are suggested to induce sites or edges for facilitating the dimerization and coupling of intermediates to ethanol and ethylene.
在相对于可逆氢电极（RHE）为-1.0 V至-1.5 V的电位范围内，对源自氧化铜（CuO）的铜电极（称为氧化物衍生铜（ODCu））上二氧化碳（CO₂）的电化学还原进行了深入研究。通过水热法制备了CuO纳米颗粒。将ODCu电极用于二氧化碳还原，结果表明该电极对C₂产物具有高度选择性，在显著更低的过电位下电流密度增强。这种催化剂在-0.95 V时将对具有最高法拉第效率的C₂产物的选择性提高到58%。此外，使用所提出的催化剂在-0.1 V的最低起始电位下实现了C₂产物的形成。X射线衍射和扫描电子显微镜显示在CO₂电还原反应（CO₂RR）过程中CuO还原为Cu（111）纳米颗粒。合成催化剂的固有性质及其表面还原被认为会诱导位点或边缘，以促进中间体二聚化和偶联生成乙醇和乙烯。
