期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 641, 期 -, 页码 782-790出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.03.097
关键词
Iridium; Polyaniline; Chelating adsorption-engaged; Carbon nanofibers; Hydrogen evolution reaction
In this study, a feasible chelating adsorption-engaged strategy was proposed to immobilize ultrafine iridium nanoparticles on N-doped carbon nanofibers derived from de-doped polyaniline. The synthesized Ir-NCNFs catalyst exhibited admirable HER activities in both alkaline and acidic conditions with overpotentials even superior or close to the benchmark Pt/C catalyst. Moreover, the catalyst also showed long-term durability.
Developing highly efficient and stable precious metal electrocatalysts toward hydrogen evolution reac-tion (HER) is crucial for energy application, while it is still challenging to achieve highly dispersed ultra -fine metal nanoparticles on some promising supports to synergistically promote their electrocatalytic performance. Herein, we propose a feasible chelating adsorption-engaged strategy by introducing de -doped polyaniline with abundant amino groups to immobilize ultrafine iridium (Ir) nanoparticles on their derived N-doped carbon nanofibers (Ir-NCNFs). Experimental results demonstrate that the synthesized Ir-NCNFs can effectively promote the charge transfer and expose more electrochemical active sites, which eventually accelerate the reaction kinetics. Thus, the synthesized Ir-NCNFs catalyst exhibits admirable HER activities in both alkaline and acidic conditions with overpotentials of only 23 and 8 mV, which are even superior or close to the benchmark Pt/C catalyst. Furthermore, the synthesized Ir-NCNFs catalyst also exhibits a long-term durability. This study affords a reliable means to construct high-performance supported ultrafine metal nanocatalysts for electrocatalytic applications to alleviate the growing demand for energy conversion.(c) 2023 Elsevier Inc. All rights reserved.
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