Yan Mengxiao, Mao Tingjie, Zeng Tiantian, Chen Kai, Wang Shun, Wang Juan, Jin Huile
Wenzhou Key Lab of Advanced Energy Storage and Conversion, Zhejiang Province Key Lab of Leather Engineering, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China.
Zhejiang Engineering Research Center for Electrochemical Energy Materials and Devices, Institute of New Materials and Industrial Technologies, Wenzhou University, Wenzhou, Zhejiang 325035, China.
Inorg Chem. 2024 Nov 18;63(46):22281-22287. doi: 10.1021/acs.inorgchem.4c03991. Epub 2024 Nov 5.
Electrochemically reducing CO (CORR) to high-value chemical products is recognized as a promising route to simultaneously reduce the consumption of fossil fuels and carbon emission. The fabrication of syngas with an appropriate H/CO ratio by CORR has been widely studied, but the dynamic evolution of the catalyst is still ambiguous. Herein, the reconstruction of CuO/SnO nanosheets (NSs) with a heterojunction structure in the CORR process was reported by an in situ X-ray diffractometer technique. The products of the CORR on the optimized CuO/SnO NSs are CO and H, achieving a nearly 100% total Faraday efficiency. Moreover, the resulting syngas is maintained at a constant 2:1 ratio of H/CO over a wide potential of -0.8 to -1.2 V versus the reversible hydrogen electrode. Importantly, the detailed characterizations show that Cu is reduced to Cu during the CORR process, while the valence state of Sn remains stable. This study presents strong experimental support for the dynamic evolution process of electrocatalysts in other energy conversion fields.
将电化学还原CO（CORR）转化为高价值化学产品被认为是一种有前景的途径，可同时减少化石燃料的消耗和碳排放。通过CORR制备具有合适H/CO比的合成气已得到广泛研究，但催化剂的动态演变仍不明确。在此，通过原位X射线衍射仪技术报道了在CORR过程中具有异质结结构的CuO/SnO纳米片（NSs）的重构。在优化的CuO/SnO NSs上进行CORR的产物为CO和H，总法拉第效率接近100%。此外，相对于可逆氢电极，在-0.8至-1.2 V的宽电位范围内，所得合成气的H/CO比保持恒定的2:1。重要的是，详细表征表明，在CORR过程中Cu被还原为Cu，而Sn的价态保持稳定。该研究为其他能量转换领域中电催化剂动态演变过程提供了有力的实验支持。
