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22. Molecular Fe─N4 Moieties Coupled with Atomic Co─N4 Sites Toward Improved Oxygen Reduction Performance.

Author

Xie, Peng‐Fei, Zhong, Hong, Fang, Lingzhe, Lyu, Zhaoyuan, Yu, Wan‐Jing, Li, Tao, Lee, Jiyoung, Shin, Hamin, Beckman, Scott P., Lin, Yuehe, Ding, Shichao, Kim, Il‐Doo, and Li, Jin‐Cheng

Subjects
MOIETIES (Chemistry), DENSITY functional theory, OXYGEN reduction, ACTIVATION energy, POWER density, IRON
Abstract

Research on high‐efficiency and cost‐efficient catalysts for oxygen reduction reaction (ORR) is still a vital but challenging issue for commercializing metal–air batteries. Herein, a single‐molecule/atom hybrid catalyst is developed to boost the ORR, in which iron phthalocyanine molecules containing molecular Fe─N4 moieties couple with atomic Co─N4 sites on the surface of polyhedral carbon. Density functional theory calculations reveal that face‐to‐face laminated construction of Fe─N4 and Co─N4 in the hybrid catalyst can effectively modulate the electronic structure of active iron atoms and reduce the energy barrier of the rate‐determining step for ORR. As a result, this hybrid catalyst demonstrates excellent ORR performance, featuring a half‐wave potential of 0.904 V, a peak power density of 238.3 mW cm−2 for zinc–air battery, and outstanding electrocatalytic stability. This work offers a distinctive and robust molecular/atomic engineering approach to creating efficient electrocatalysts, advancing the fields of metal–air batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Metallization of Targeted Protein Assemblies in Cell‐Derived Extracellular Matrix by Antibody‐Guided Biotemplating.

Author

Song, Chang Woo, Ahn, Jaewan, Yong, Insung, Kim, Nakhyun, Park, Chan E, Kim, Sein, Chung, Sung‐Yoon, Kim, Pilnam, Kim, Il‐Doo, and Chang, Jae‐Byum

Subjects
EXTRACELLULAR matrix, MORPHOLOGY, BIOLOGICAL systems, THERMAL conductivity, MATERIALS science, BIOMIMETIC materials
Abstract

Biological systems are composed of hierarchical structures made of a large number of proteins. These structures are highly sophisticated and challenging to replicate using artificial synthesis methods. To exploit these structures in materials science, biotemplating is used to achieve biocomposites that accurately mimic biological structures and impart functionality of inorganic materials, including electrical conductivity. However, the biological scaffolds used in previous studies are limited to stereotypical and simple morphologies with little synthetic diversity because of a lack of control over their morphologies. This study proposes that the specific protein assemblies within the cell‐derived extracellular matrix (ECM), whose morphological features are widely tailorable, can be employed as versatile biotemplates. In a typical procedure, a fibrillar assembly of fibronectin—a constituent protein of the ECM—is metalized through an antibody‐guided biotemplating approach. Specifically, the antibody‐bearing nanogold is attached to the fibronectin through antibody–antigen interactions, and then metals are grown on the nanogold acting as a seed. The biomimetic structure can be adapted for hydrogen production and sensing after improving its electrical conductivity through thermal sintering or additional metal growth. This study demonstrates that cell‐derived ECM can be an attractive option for addressing the diversity limitation of a conventional biotemplate. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Obesity-induced Ly6C High and Ly6C Low monocyte subset changes abolish post-ischemic limb conditioning benefits in stroke recovery.

Author

Kim, Il-doo, Ju, Hyunwoo, Minkler, Joseph, Madkoor, Ahmed, Park, Keun Woo, and Cho, Sunghee

Abstract

Remote limb conditioning (RLC), performed by intermittent interruption of blood flow to a limb, triggers endogenous tolerance mechanisms and improves stroke outcomes. The underlying mechanism for the protective effect involves a shift of circulating monocytes to a Ly6CHigh proinflammatory subset in normal metabolic conditions. The current study investigates the effect of RLC on stroke outcomes in subjects with obesity, a vascular comorbidity. Compared to lean mice, obese stroke mice displayed significantly higher circulating monocytes (monocytosis), increased CD45High monocytes/macrophages infiltration to the injured brain, worse acute outcomes, and delayed recovery. Unlike lean mice, obese mice with RLC at 2 hours post-stroke failed to shift circulating monocytes to pro-inflammatory status and nullified RLC-induced functional benefit. The absence of the monocyte shift was also observed in splenocytes incubated with RLC serum from obese mice, while the shift was observed in the cultures with RLC serum from lean mice. These results showed that the alteration of monocytosis and subsets underlies negating RLC benefits in obese mice and suggest careful considerations of comorbidities at the time of RLC application for stroke therapy. [ABSTRACT FROM AUTHOR]

Published
2024
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