Improved High-Current-Density Hydrogen Evolution Reaction Kinetics on Single-Atom Co Embedded in Order Pore Structured Nitrogen Assembly Carbon Support
Jiaqi Yu, Yu Yan, Yuemin Lin, Hengzhou Liu, Yuting Li, Shaohua Xie, Simin Sun, Fudong Liu, Zhiguo Zhang, Wenzhen Li, Jin-Su Oh, Lin Zhou, Long Qi, Bin Wang, Wenyu Huang
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引用次数: 0
Abstract
Single-atom catalysis is a subcategory of heterogeneous catalysis with well-defined active sites. Numerous endeavors have been devoted to developing single-atom catalysts for industrially applicable catalysis, including hydrogen evolution reaction (HER). High current density electrolyzers have been pursued for single-atom catalysts to increase active site density and enhance mass transfer. Here, we reason that single-atom metal embedded in nitrogen assembly carbon (NAC) catalysts with high single-atom density, large surface area, and ordered mesoporosity, could fulfill the industrially applicable HER. Among several different single-atom catalysts, the HER overpotential with the best performing Co-NAC reaches 200 mA cm−2 current density at 310 mV, relevant to industrial applicable current density. Density functional theory (DFT) calculations suggest the feasible hydrogen binding on single-atom Co results in the promising HER activity over Co-NAC. The best-performing Co-NAC shows robust performance under alkaline conditions at 50 mA cm−2 current density for 20 h in an H-cell and at 150 mA cm−2 current density for 100 h in a flow cell.
期刊介绍:
Nanoscale Horizons stands out as a premier journal for publishing exceptionally high-quality and innovative nanoscience and nanotechnology. The emphasis lies on original research that introduces a new concept or a novel perspective (a conceptual advance), prioritizing this over reporting technological improvements. Nevertheless, outstanding articles showcasing truly groundbreaking developments, including record-breaking performance, may also find a place in the journal. Published work must be of substantial general interest to our broad and diverse readership across the nanoscience and nanotechnology community.