| Autor: |
Hou Q; College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, People's Republic of China., Liu K; School of Physics and Electronic, Central South University, Changsha, Hunan 410083, People's Republic of China., Al-Maksoud W; Catalysis Centre, PSE, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia., Huang Y; College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, People's Republic of China., Ding; Shaanxi Electric Power Research Institute, Xi'an, Shanxi 710054, People's Republic of China., Lei Y; Powder Metallurgy Research Institute, Central South University, Changsha, Hunan 410083, China., Zhang Y; College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, People's Republic of China., Lin B; School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People's Republic of China., Zheng L; Beijing Synchrotron Radiation Facility, Chinese Academy of Science, Institute of High Energy Physics, Beijing 100049, People's Republic of China., Liu M; School of Physics and Electronic, Central South University, Changsha, Hunan 410083, People's Republic of China., Basset JM; Catalysis Centre, PSE, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia., Chen Y; College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, People's Republic of China. |
| Abstrakt: |
Nonprecious-metal heterogeneous catalysts with atomically dispersed active sites demonstrated high activity and selectivity in different reactions, and the rational design and large-scale preparation of such catalysts are of great interest but remain a huge challenge. Current approaches usually involve extremely high-temperature and tedious procedures. Here, we demonstrated a straightforward and scalable preparation strategy. In two simple steps, the atomically dispersed Ni electrocatalyst can be synthesized in a tens grams scale with quantitative yield under mild conditions, and the active Ni sites were produced by immobilizing preorganized NiN x complex on the substrate surface via organic thermal reactions. This catalyst exhibits excellent catalysis performances in both oxygen evolution and reduction reactions. It also exhibited tunable catalysis activity, high catalysis reproducibility, and high stability. The atomically dispersed NiN x sites are tolerant at high Ni concentration, as the random reactions and metal nanoparticle formation that generally occurred at high temperatures were avoided. This strategy illustrated a practical and green method for the industrial manufacture of nonprecious-metal single-site catalysts with a predictable structure. |
