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Toward Activity Origin of Electrocatalytic Hydrogen Evolution Reaction on Carbon-Rich Crystalline Coordination Polymers

Toward Activity Origin of Electrocatalytic Hydrogen Evolution Reaction on Carbon-Rich Crystalline Coordination Polymers
Renhao Dong, Stavroula Sfaelou, Diana C. Tranca, Lihuan Wang, Tao Zhang, Jian Zhang, Xiaodong Zhuang, Yanpeng Qi, Gotthard Seifert, Zhikun Zheng
The fundamental understanding of electrocatalytic active sites for hydrogen evolution reaction (HER) is significantly important for the development of metal complex involved carbon electrocatalysts with low kinetic barrier. Here, the MSxNy (M = Fe, Co, and Ni, x/y are 2/2, 0/4, and 4/0, respectively) active centers are immobilized into ladder-type, highly crystalline coordination polymers as model carbon-rich electrocatalysts for H2 generation in acid solution. The electrocatalytic HER tests reveal that the coordination of metal, sulfur, and nitrogen synergistically facilitates the hydrogen ad-/desorption on MSxNy catalysts, leading to enhanced HER kinetics. Toward the activity origin of MS2N2, the experimental and theoretical results disclose that the metal atoms are preferentially protonated and then the production of H2 is favored on the MN active sites after a heterocoupling step involving a N-bound proton and a metal-bound hydride. Moreover, the tuning of the metal centers in MS2N2 leads to the HER performance in the order of FeS2N2 > CoS2N2 > NiS2N2. Thus, the understanding of the catalytic active sites provides strategies for the enhancement of the electrocatalytic activity by tailoring the ligands and metal centers to the desired function. The fundamental understanding of electrocatalytic hydrogen-evolution reaction active sites is important for the development of metal complex involved carbon electrocatalysts with low kinetic barrier. Here, the molecular active centers are selectively incorporated into ladder-type, highly crystalline coordination polymers as model carbon electrocatalysts for H2 generation from water. The activity origin is clarified.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700783

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