钴掺杂氮化钨/氮掺杂碳的制备及氧还原性能研究
Preparation and Oxygen Reduction Performance of Co-Doped W2N/N-Doped Carbon
摘要: 采用一步煅烧法成功制备了钴掺杂氮化钨/氮掺杂碳复合材料(Co-W2N-NC)，对该材料进行形貌、结构表征和阴极氧还原(ORR)性能测试。实验结果表明，在700℃下制备的Co-W2N-700催化剂展现出最佳的催化性能，其活性优于650℃和750℃条件下制备的样品，这主要是因为700℃时，催化剂具有丰富的结构缺陷和适度的石墨化特征。通过引入过渡金属钴对W2N-NC-700进行改性，Co的引入调节了W2N的电子结构，影响了ORR过程中的传质过程。电化学测试表明，Co-W2N-NC-7表现出最佳的ORR性能，半波电位为0.82 V，接近20 wt% Pt/C。在15 h的稳定性测试中，电流仅衰减9.5%，优于20 wt% Pt/C。
Abstract: A cobalt-doped tungsten nitride/nitrogen-doped carbon composite (Co-W2N-NC) was successfully synthesized via a one-step calcination method. The morphology, structure, and cathodic oxygen reduction reaction (ORR) performance of the as-prepared material were systematically characterized and evaluated. The experimental results indicate that the Co-W₂N-700 catalyst, prepared at 700˚C, exhibits the optimal catalytic performance, outperforming samples synthesized at 650˚C and 750˚C. This enhanced performance is primarily attributed to the abundant structural defects and an appropriate degree of graphitization achieved at 700˚C. To further enhance the catalytic activity of W2N-NC, Co was introduced to modify W2N-NC. The incorporation of Co modulates the electronic structure of W2N and influences the mass transfer process during the ORR progress. Electrochemical tests reveal that Co-W2N-NC-7 shows the best ORR performance, achieving a half-wave potential of 0.82 V, comparable to commercial 20 wt% Pt/C. In a 15-hour stability test, the current density declines by only 9.5%, outperforming 20 wt% Pt/C.
文章引用：李黎兵, 孔白雪, 刘亚婷, 苗永霞, 杨新丽. 钴掺杂氮化钨/氮掺杂碳的制备及氧还原性能研究[J]. 物理化学进展, 2026, 15(2): 148-160. https://doi.org/10.12677/japc.2026.152016

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