Journal ArticleDOI
Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting
TLDR
In this paper, the interlayer confinement synthesis of sulfur-doped carbon-coated Ir nanodots on reduced graphene oxide (Ir@S-C/rGO) was reported as an electrocatalyst for overall water splitting.Abstract:
Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities for enhancing their electrocatalytic performance for water splitting. However, the preparation of highly dispersed nanodot electrocatalysts remains a challenge. Herein, we report the interlayer confinement synthesis of sulfur-doped carbon-coated Ir nanodots on reduced graphene oxide (Ir@S–C/rGO) as an electrocatalyst for overall water splitting. The Ir@S–C/rGO composite is derived from a guest/host precursor of dodecyl sulfate (DS−)/hexachloroiridate (IrCl63−) co-intercalated MgAl-layered double hydroxide on a GO support. The composite has these advantages: Ir nanodots (1.7 ± 0.2 nm) with a low Ir amount of 6.2 wt%, S-doped carbonaceous encapsulation and a rGO support, as well as a large specific surface area of 194 m2 g−1 and meso-/macropore size distribution. The composite electrode requires overpotentials of 280 and 300 mV at 10 and 20 mA cm−2, respectively, for the oxygen evolution reaction (OER) in alkaline conditions; and 20 and 35 mV at 10 and 20 mA cm−2 for the hydrogen evolution reaction (HER) in alkaline conditions, respectively. Furthermore, a two-electrode electrolyzer yields a current density of 10 mA cm−2 at 1.51 V for overall water splitting. Moreover, the density functional theory calculations show that the charge distribution of the Ir nanoclusters facilitates the enhancement of the electrocatalytic activity for the OER, and the sulfur-doped carbon lowers the work function of the Ir particles on graphene; both of which underpin the enhancement. Our guest/host-assisted interlayer nanoconfinement can promise an effective synthesis strategy for designing and preparing well-dispersed nanodots as promising electrocatalysts for water splitting.read more
Citations
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Journal ArticleDOI
Reversing the Nucleophilicity of Active Sites in CoP2 Enables Exceptional Hydrogen Evolution Catalysis.
Shu Juan Niu,Ya Jun Fang,Dewei Rao,Guangjie Liang,Senyang Li,Jinyan Cai,Bo Liu,Jianming Li,Gongming Wang +8 more
TL;DR: In this article , an anion-deficient strategy to precisely capture Ru single atoms on the anion vacancies of CoP2 (Ru-SA/Pv-CoP2 ) is developed.
Journal ArticleDOI
Few-layered MoN–MnO heterostructures with interfacial-O synergistic active centers boosting electrocatalytic hydrogen evolution
TL;DR: In this article, a few-layered MoN-MnO heterostructure catalysts implanted with interfacial-O configuration as synergistic sites were designed for hydrogen evolution reaction (HER).
Journal ArticleDOI
Synthesis and Electronic Modulation of Nanostructured Layered Double Hydroxides for Efficient Electrochemical Oxygen Evolution.
Ting Wang,Weiwen Wang,Wenjie Shao,Mingru Bai,Mi Zhou,Shuang Li,Tian Ma,Lang Ma,Lang Ma,Chong Cheng,Chong Cheng,Xikui Liu +11 more
TL;DR: In this article, a review of nanostructured layered double hydroxides (nLDHs) for OER electrocatalysis is presented, with a unique focus on their electronic modulations and in situ analysis on catalytic processes.
Journal ArticleDOI
NiS2 nanodots on N,S-doped graphene synthesized via interlayer confinement for enhanced lithium-/sodium-ion storage.
Xiaofeng Dong,Feijiang Chen,Guoguang Chen,Bin Wang,Xiaoli Tang,Xiaolong Yan,Ya-Xia Yin,Chengwei Deng,Duan Wang,Jianfeng Mao,Sailong Xu,Shilin Zhang +11 more
TL;DR: In this article , a host/guest-derived interlayer nanoconfinement enables the composite to integrate the advantageous features: low-content active NiS2 nanodots (11.0 wt%) with a mean size of 3.8 ± 0.5 nm, high-content N,S-rGO (89.5 wt%), as well as a large specific surface area and mesopore size distribution.
Journal ArticleDOI
Understanding ultra-dispersed CeO modified iridium clusters as bifunction electrocatalyst for high-efficiency water splitting in acid electrolytes
TL;DR: In this article , the noble metal iridium (Ir) can be electronically modulated, thus reducing the activation energy of intermediate, and improving the intrinsic catalytic activity for practical application, and the performance of Ir3CeOx/C is more prominent among different feeding ratios of the precursor.
References
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Journal ArticleDOI
Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
Journal ArticleDOI
Soft self-consistent pseudopotentials in a generalized eigenvalue formalism.
TL;DR: Novel features are that the pseudopotential itself becomes charge-state dependent, the usual norm-conservation constraint does not apply, and a generalized eigenproblem is introduced.
Journal ArticleDOI
First-principles simulation: ideas, illustrations and the CASTEP code
Matthew D. Segall,Philip J. D. Lindan,Matt Probert,Chris J. Pickard,P. J. Hasnip,Stewart J. Clark,Mike C. Payne +6 more
TL;DR: The basics of the suject are looked at, a brief review of the theory is given, examining the strengths and weaknesses of its implementation, and some of the ways simulators approach problems are illustrated through a small case study.
Journal ArticleDOI
Relaxation of Crystals with the Quasi-Newton Method
TL;DR: In this article, a quasi-Newton method is used to simultaneously relax the internal coordinates and lattice parameters of crystals under pressure, and the symmetry of the crystal structure is preserved during the relaxation.
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Recent Advances in Electrocatalytic Hydrogen Evolution Using Nanoparticles.
TL;DR: The fundamentals of HER are summarized and the recent state-of-the-art advances in the low-cost and high-performance catalysts based on noble and non-noble metals, as well as metal-free HER electrocatalysts are reviewed.