Chun Li,Long Zhang,Ying Zhang,Yan Zhou,Jingwen Sun,Xiaoping Ouyang,Xin Wang,Junwu Zhu,Yongsheng Fu
Designing a highly efficient and low-cost electrocatalyst for hydrogen evolution reaction (HER) is of great importance to produce high-purity hydrogen, yet it still remains a huge challenge. Here, we present a facile synthesis of this electrocatalyst, PtRu alloy nanoparticles supported on C 2 N nanosheets , using a condensation-reduction approach. The PtRu@C 2 N exhibits comparable performance than the commercial Pt/C and higher efficiency than monometallic Pt@C 2 N and Ru@C 2 N in both acidic and alkaline conditions. The highly enhanced activity and fast kinetics of PtRu@C 2 N were attributed to the large electrochemical active surface area, unique electronic structure of PtRu nanoparticles on C 2 N nanosheets. Density functional theory calculations show that the alloy effect and the metal-support interaction in PtRu@C 2 N catalyst optimizes the adsorption energy of H atom and other intermediates, resulting in the improvement of HER activity.
Nitrogen-doped carbon materials are widely used in sodium-ion batteries, but their uncertain doping structure, low nitrogen content, and sluggish sodiation kinetics hinder their practical application. Herein, thin-layer carbon nitride (C2N) with accurate nitrogen bonding location, ultrahigh nitrogen content, and an inherent nanohole structure is covalently confined onto the surface of reduced graphene oxide (C2N/rGO) via an SN1 nucleophilic substitution reaction combined with in situ polymerization. Benefiting from the abundant active sites, a short ion/electron transfer distance, and good conductivity, the C2N/rGO electrode delivers a capacity of 218.1 mAh g–1 after 1000 cycles at 1 A g–1. Moreover, the Na-storage mechanism is proven to be a capacity governed process through cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT) methods. This work demonstrates a viable strategy to design an atomically ordered porous nitrogen-containing two-dimensional (2D) carbon material with excellent electrochemical performances.
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