Li Lanqing, Gao Wei, Wan Ziqi, Wan Xinhao, Ye Jianqi, Gao Jie, Wen Dan
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, P. R. China.
Chongqing Innovation Center, Northwestern Polytechnical University, Chongqing, 401135, P. R. China.
Small. 2024 Jul;20(29):e2400158. doi: 10.1002/smll.202400158. Epub 2024 Feb 28.
Noble metallic aerogels with the self-supported hierarchical structure and remarkable activity are promising for methanol fuel cells, but are limited by the severe poisoning and degradation of active sites during electrocatalysis. Herein, the highly stable electrocatalyst of N-doped carbon dots-PtNi (NCDs-PtNi) aerogels is proposed by confining NCDs with alloyed PtNi for methanol oxidation and oxygen reduction reactions. Comprehensive electrocatalytic measurements and theoretical investigations suggest the improvement in structure stability and regulation in electronic structure for better electrocatalytic durability when confining NCDs with PtNi aerogels. Notably, the NCDs-PtNi aerogels perform 12-fold higher activity than that of Pt/C and maintain 52% of their initial activity after 5000 cycles toward acidic methanol oxidation. The enhanced stability and activity of NCDs-PtNi aerogels are also evident for oxygen reduction reactions in different electrolytes. These results highlight the effectiveness of stabilizing metallic aerogels with NCDs, offering a feasible pathway to develop robust electrocatalysts for fuel cells.
具有自支撑分级结构和卓越活性的贵金属气凝胶在甲醇燃料电池方面具有广阔前景，但在电催化过程中，活性位点会受到严重中毒和降解的限制。在此，通过将氮掺杂碳点（NCDs）与合金化的铂镍（PtNi）相结合用于甲醇氧化和氧还原反应，提出了高度稳定的N掺杂碳点 - 铂镍（NCDs - PtNi）气凝胶电催化剂。综合电催化测量和理论研究表明，当NCDs与PtNi气凝胶结合时，结构稳定性得到改善，电子结构得到调控，从而具有更好的电催化耐久性。值得注意的是，NCDs - PtNi气凝胶的活性比Pt/C高12倍，在酸性甲醇氧化反应中经过5000次循环后仍保持其初始活性的52%。NCDs - PtNi气凝胶在不同电解质中的氧还原反应中，其稳定性和活性也得到增强。这些结果突出了用NCDs稳定金属气凝胶的有效性，为开发用于燃料电池的稳健电催化剂提供了一条可行途径。
