MoS2-modified porous gas diffusion layer with air-solid-liquid interface for efficient electrocatalytic water splitting
MoS2-modified porous gas diffusion layer with air-solid-liquid interface for efficient electrocatalytic water splitting
复制标题
MoS2 改性多孔气体扩散层，具有空气-固-液界面，可实现高效电催化水分解
DOI：
10.1039/c8nr04082f
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
Wang Qu Quan
中科院分区：
文献类型：
--
作者：
Sui Chenxi;Chen Kai;Zhao Liming;Zhou Li;Wang Qu Quan
气泡在电极上的形成和吸附通过阻碍质子转移和消耗成核能而削弱了析氢反应（HER）和析氧反应（OER）等析气反应的效率。本文中，通过将MoS 2纳米片固定在多孔气体扩散层（GDL）上来制造三相电极以解决该限制。该电极具有上级HER和OER比高、电流密度大、工作状态稳定等特点。此外，通过降低GDL后的压力，我们进一步提高了水分解速率（电流密度是裸MoS 2双相电极的三倍，HER为-0.37 V，OER为1.62 V）和稳定性，即使在高达100 mA cm-2的电流密度下，也消除了气泡的出现。我们的工作表明了构建水裂解三相体系的重要性，该体系也适用于其他析气反应。
The formation and adsorption of bubbles on electrodes weaken the efficiency of gas evolution reactions such as the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by hindering proton transfer and consuming nucleation energy. Herein, a triphase electrode was fabricated to address this limitation by immobilizing MoS2 nanosheets on a porous gas diffusion layer (GDL). This electrode shows a superior HER and OER ratio, high current density and stable working state in electrocatalytic water splitting. Moreover, by lowering the pressure behind the GDL, we further improved the water-splitting rate (the current density was three times higher than that of a bare MoS2 diphase electrode at −0.37 V for HER and 1.62 V for OER) and stability by eliminating the appearance of bubbles, even under a current density as high as 100 mA cm−2. Our work manifests the significance of constructing a triphase system for water splitting, and the system is also available for other gas evolution reactions.