定制 3D 打印电极以增强水分解,ACS Applied Materials & Interfaces

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定制 3D 打印电极以增强水分解
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-09 , DOI: 10.1021/acsami.2c12579
Raúl A Márquez ₁ , Kenta Kawashima ₁ , Yoon Jun Son ₂ , Roger Rose ₃ , Lettie A Smith ₁ , Nathaniel Miller ₄ , Omar Ali Carrasco Jaim ₂ , Hugo Celio ₅ , C Buddie Mullins _{1,

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Affiliation

碱性水电解是一种很有前途的清洁能源储存技术，除了内在的电催化活性外，还受到外在因素的限制。要开始比较用于电解应用的催化材料，必须首先了解和控制这些外在因素。在这里，我们修改了外部电极特性并研究了气泡释放的影响，以检查电极和表面设计如何影响水电解的性能。我们通过连续的三维 (3D) 打印和金属沉积程序制造坚固且具有成本效益的电极。通过对沉积过程的系统评估，我们确认了外部电极特性（即、润湿性、表面粗糙度和电化学活性表面积）和电化学性能。修改电极的几何形状、尺寸和电解液流速会导致过电势降低以及氢 (HER) 和析氧反应 (OER) 的气泡直径和寿命不同。因此，我们证明了电极结构和强制电解质对流对气泡释放的重要作用。此外，我们通过评估 HER/OER 性能、气泡消散和长期稳定性来确认有序的 Ni 涂层 3D 多孔结构的适用性。最后，我们利用 3D 多孔电极作为研究基准 NiFe 电催化剂的支持，证实了用于测试电催化材料的 3D 打印电极的稳健性和有效性，同时精确控制了外在特性。总体而言，我们证明了调整电极结构和表面特性可以精确调整外在电极特性，为测试水电解电极材料的效率提供更多可重复性和可比性的条件。

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Tailoring 3D-Printed Electrodes for Enhanced Water Splitting

Alkaline water electrolysis, a promising technology for clean energy storage, is constrained by extrinsic factors in addition to intrinsic electrocatalytic activity. To begin to compare between catalytic materials for electrolysis applications, these extrinsic factors must first be understood and controlled. Here, we modify extrinsic electrode properties and study the effects of bubble release to examine how the electrode and surface design impact the performance of water electrolysis. We fabricate robust and cost-effective electrodes through a sequential three-dimensional (3D) printing and metal deposition procedure. Through a systematic assessment of the deposition procedure, we confirm the close relationship between extrinsic electrode properties (i.e., wettability, surface roughness, and electrochemically active surface area) and electrochemical performance. Modifying the electrode geometry, size, and electrolyte flow rate results in an overpotential decrease and different bubble diameters and lifetimes for the hydrogen (HER) and oxygen evolution reactions (OER). Hence, we demonstrate the essential role of the electrode architecture and forced electrolyte convection on bubble release. Additionally, we confirm the suitability of ordered, Ni-coated 3D porous structures by evaluating the HER/OER performance, bubble dissipation, and long-term stability. Finally, we utilize the 3D porous electrode as a support for studying a benchmark NiFe electrocatalyst, confirming the robustness and effectiveness of 3D-printed electrodes for testing electrocatalytic materials while extrinsic properties are precisely controlled. Overall, we demonstrate that tailoring electrode architectures and surface properties result in precise tuning of extrinsic electrode properties, providing more reproducible and comparable conditions for testing the efficiency of electrode materials for water electrolysis.

更新日期：2022-09-09

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