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Inner Co Synergizing Outer Ru Supported on Carbon Nanotubes for Efficient pH-Universal Hydrogen Evolution Catalysis
Nano-Micro Letters ( IF 26.6 ) Pub Date : 2022-09-14 , DOI: 10.1007/s40820-022-00933-2
Jian Chen 1 , Yuan Ha 2 , Ruirui Wang 3 , Yanxia Liu 1 , Hongbin Xu 3 , Bin Shang 4 , Renbing Wu 3 , Hongge Pan 1, 5
Affiliation  

Exploring highly active but inexpensive electrocatalysts for the hydrogen evolution reaction (HER) is of critical importance for hydrogen production from electrochemical water splitting. Herein, we report a multicomponent catalyst with exceptional activity and durability for HER, in which cobalt nanoparticles were in-situ confined inside bamboo-like carbon nanotubes (CNTs) while ultralow ruthenium loading (~ 2.6 µg per electrode area ~ cm−2) is uniformly deposited on their exterior walls (Co@CNTsǀRu). The atomic-scale structural investigations and theoretical calculations indicate that the confined inner Co and loaded outer Ru would induce charge redistribution and a synergistic electron coupling, not only optimizing the adsorption energy of H intermediates (ΔGH*) but also facilitating the electron/mass transfer. The as-developed Co@CNTsǀRu composite catalyst requires overpotentials of only 10, 32, and 63 mV to afford a current density of 10 mA cm−2 in alkaline, acidic and neutral media, respectively, representing top-level catalytic activity among all reported HER catalysts. The current work may open a new insight into the rational design of carbon-supported metal catalysts for practical applications.



中文翻译:

碳纳米管负载的内钴协同外钌用于高效 pH 通用析氢催化

探索用于析氢反应 (HER) 的高活性但廉价的电催化剂对于电化学水分解制氢至关重要。在此,我们报告了一种对 HER 具有出色活性和耐久性的多组分催化剂,其中钴纳米粒子被原位限制在竹状碳纳米管 (CNT) 内,而超低钌负载量(每个电极面积约 2.6 µg ~ cm -2 是均匀地沉积在它们的外墙上(Co@CNTsǀRu)。原子级结构研究和理论计算表明,受限的内部 Co 和负载的外部 Ru 会引起电荷重新分配和协同电子耦合,不仅优化了 H 中间体的吸附能 (Δ G H *) 但也促进了电子/质量转移。所开发的 Co@CNTsǀRu 复合催化剂仅需 10、32 和 63 mV 的过电位即可在碱性、酸性和中性介质中分别提供 10 mA cm -2的电流密度,代表了所有已报道的顶级催化活性HER催化剂。目前的工作可能为实际应用的碳负载金属催化剂的合理设计开辟新的视角。

更新日期:2022-09-15
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