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Conductive and Elastic TiO2 Nanofibrous Aerogels: A New Concept toward Self-Supported Electrocatalysts with Superior Activity and Durability.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-02 , DOI: 10.1002/anie.202010110 Meng Zhang 1 , Yan Wang 2 , Yuanyuan Zhang 1 , Jun Song 2 , Yang Si 3 , Jianhua Yan 1 , Chunlan Ma 4 , Yi-Tao Liu 1, 3 , Jianyong Yu 3 , Bin Ding 1, 3
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-02 , DOI: 10.1002/anie.202010110 Meng Zhang 1 , Yan Wang 2 , Yuanyuan Zhang 1 , Jun Song 2 , Yang Si 3 , Jianhua Yan 1 , Chunlan Ma 4 , Yi-Tao Liu 1, 3 , Jianyong Yu 3 , Bin Ding 1, 3
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Recently, various titanium dioxide (TiO2) nanostructures have received increasing attention in the fields of energy conversion and storage owing to their electrochemical properties. However, these particulate nanomaterials exclusively exist in the powder form, which may cause health risks and environmental hazards. Herein we report a novel, highly elastic bulk form of TiO2 for safe use and easy recycling. Specifically, TiO2 nanofibrous aerogels (NAs) consisting of resiliently bonded, flexible TiO2 nanofibers are constructed, which have an ultralow bulk density, ultrahigh porosity, and excellent elasticity. To promote charge transfer, they are subjected to lithium reduction to generate abundant oxygen vacancies, which can modulate the electronic structure of TiO2, resulting in a conductivity up to 38.2 mS cm−1. As a proof‐of‐concept demonstration, the conductive and elastic TiO2 NAs serve as a new type of self‐supported electrocatalyst for ambient nitrogen fixation, achieving an ammonia yield of 4.19×10−10 mol s−1 cm−2 and a Faradaic efficiency of 20.3 %. The origin of the electrocatalytic activity is revealed by DFT calculations.
中文翻译：
导电性和弹性TiO2纳米纤维气凝胶：具有优异活性和耐用性的自支撑电催化剂的新概念。
近年来，由于其电化学性质，各种二氧化钛（TiO 2）纳米结构在能量转换和存储领域中受到越来越多的关注。然而，这些颗粒纳米材料仅以粉末形式存在，这可能引起健康风险和环境危害。本文中，我们报告了一种新颖的，高弹性的块状TiO 2，可安全使用且易于回收。具体来说，TiO 2纳米纤维气凝胶（NAs）由弹性结合的柔性TiO 2组成构造了纳米纤维，其具有超低的堆积密度，超高的孔隙率和出色的弹性。为了促进电荷转移，对它们进行锂还原以产生大量的氧空位，这可以调节TiO 2的电子结构，从而导致电导率高达38.2 mS cm -1。作为概念证明，导电和弹性的TiO 2 NAs可作为一种新型的自支撑型电催化剂，用于环境固氮，可实现4.19×10 -10 mol s -1 cm -2的氨产率和法拉第效率为20.3％。通过DFT计算揭示了电催化活性的起源。
更新日期：2020-09-02
中文翻译：
导电性和弹性TiO2纳米纤维气凝胶：具有优异活性和耐用性的自支撑电催化剂的新概念。
近年来，由于其电化学性质，各种二氧化钛（TiO 2）纳米结构在能量转换和存储领域中受到越来越多的关注。然而，这些颗粒纳米材料仅以粉末形式存在，这可能引起健康风险和环境危害。本文中，我们报告了一种新颖的，高弹性的块状TiO 2，可安全使用且易于回收。具体来说，TiO 2纳米纤维气凝胶（NAs）由弹性结合的柔性TiO 2组成构造了纳米纤维，其具有超低的堆积密度，超高的孔隙率和出色的弹性。为了促进电荷转移，对它们进行锂还原以产生大量的氧空位，这可以调节TiO 2的电子结构，从而导致电导率高达38.2 mS cm -1。作为概念证明，导电和弹性的TiO 2 NAs可作为一种新型的自支撑型电催化剂，用于环境固氮，可实现4.19×10 -10 mol s -1 cm -2的氨产率和法拉第效率为20.3％。通过DFT计算揭示了电催化活性的起源。
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