Superhydrophobic Carbon Functionalized by Chemical Grafting of Fluoroalkylsilane Enables an Efficient Microporous Layer for Proton-Exchange Membrane Fuel Cells,ACS Sustainable Chemistry & Engineering

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Superhydrophobic Carbon Functionalized by Chemical Grafting of Fluoroalkylsilane Enables an Efficient Microporous Layer for Proton-Exchange Membrane Fuel Cells
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-11-05 , DOI: 10.1021/acssuschemeng.2c04941
Tianyi Gu ₁ , Qian Zhang ₁ , Ruhua Shi ₁ , Jin Yan ₁ , Jie Guo ₁ , Wei Qian ₂ , Bowen Zhai ₂ , Mingzheng Zhou ₂ , Maorong Chai ₂ , Ruizhi Yang ₁

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Microporous layer (MPL) is a vital component for proton-exchange membrane fuel cells (PEMFCs) to improve the cell performance. However, the conventional preparation of MPL, involving the mixing of carbon black with hydrophobic agent polytetrafluoroethylene (PTFE), followed by high-temperature annealing, is often complicated and costly. Herein, we present a facile and low-cost method to fabricate the MPL by functionalization of carbon black via covalent bonding with hydrophobic agent. Upon chemical grafting with fluoroalkylsilane (FAS-17), the water contact angle of carbon black is increased from 66.4 to 150.4°, resulting in superhydrophobicity. The MPL prepared with the resultant superhydrophobic carbon endows the PEMFC with enhanced gas and water permeability and hereby improved electrochemical performance over traditional MPL, and a maximum power density of 1211 mW cm^–2 for the PEMFC can be obtained. This work offers a feasible strategy to construct an efficient MPL for the PEMFC via a chemical grafting approach.

中文翻译：

通过化学接枝氟烷基硅烷功能化的超疏水碳为质子交换膜燃料电池提供高效的微孔层

微孔层 (MPL) 是质子交换膜燃料电池 (PEMFC) 提高电池性能的重要组成部分。然而，传统的 MPL 制备方法，包括将炭黑与疏水剂聚四氟乙烯 (PTFE) 混合，然后进行高温退火，通常非常复杂且成本高昂。在此，我们提出了一种简便且低成本的方法来通过以下方式对炭黑进行功能化来制造MPL与疏水剂共价结合。用氟烷基硅烷 (FAS-17) 进行化学接枝后，炭黑的水接触角从 66.4° 增加到 150.4°，从而产生超疏水性。用所得超疏水碳制备的 MPL 赋予 PEMFC 增强的气体和水渗透性，从而提高了传统 MPL 的电化学性能，并且可以获得 1211 mW cm ^-2的 PEMFC 最大功率密度。这项工作提供了一种可行的策略，通过化学接枝方法为 PEMFC 构建高效的 MPL 。

更新日期：2022-11-05

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