Flexible Bifunctional Electrode for Alkaline Water Splitting with Long-Term Stability
Flexible Bifunctional Electrode for Alkaline Water Splitting with Long-Term Stability
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DOI：
10.1021/acsami.3c12944
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发表时间：
2024-02
影响因子：
9.5
通讯作者：
Abhijit Ganguly;R. McGlynn;Adam Boies;P. Maguire;D. Mariotti;Supriya Chakrabarti
中科院分区：
文献类型：
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作者：
Abhijit Ganguly;R. McGlynn;Adam Boies;P. Maguire;D. Mariotti;Supriya Chakrabarti
电化学水裂解装置作为未来可再生和清洁能源系统的进展需要开发由高效和地球丰富的双功能电催化剂组成的电极。本研究揭示了一种新的灵活的和双功能的电极（NiO@CNTR）通过杂交宏观组装的碳纳米管带（CNTR）和大气等离子体合成的NiO量子点（QD）与不同的负载量，以证明稳定和有效的整体水裂解（OWS）应用的双功能电催化活性。对不同电解质的影响进行比较研究，例如，酸性和碱性的，揭示了开发的NiO@CNTR电极对碱性电解质的强烈偏好，表明其对于HER和OER活性的双功能性。我们提出的NiO@CNTR电极通过组装与阳极和阴极相同的电极材料，在两电极碱性电解槽电池配置中表现出显著增强的整体催化性能，具有显著的长期稳定性，在100 h长的OWS运行后保持约100%的初始电流，这归因于NiO QD催化剂和CNTR基质之间的“协同偶联”。有趣的是，与文献中报道的其他催化剂负载值相比，所开发的电极表现出仅1.81 V的电池电势（E10），具有显著低的NiO QD负载（83 μg/cm 2）。本研究展示了一类具有单金属基双功能催化剂的潜在碳基电极，其为进一步开发适用于碱性OWS应用和绿色制氢的催化剂及其负载工程开辟了具有成本效益和大规模的途径。
Progress in electrochemical water-splitting devices as future renewable and clean energy systems requires the development of electrodes composed of efficient and earth-abundant bifunctional electrocatalysts. This study reveals a novel flexible and bifunctional electrode (NiO@CNTR) by hybridizing macroscopically assembled carbon nanotube ribbons (CNTRs) and atmospheric plasma-synthesized NiO quantum dots (QDs) with varied loadings to demonstrate bifunctional electrocatalytic activity for stable and efficient overall water-splitting (OWS) applications. Comparative studies on the effect of different electrolytes, e.g., acid and alkaline, reveal a strong preference for alkaline electrolytes for the developed NiO@CNTR electrode, suggesting its bifunctionality for both HER and OER activities. Our proposed NiO@CNTR electrode demonstrates significantly enhanced overall catalytic performance in a two-electrode alkaline electrolyzer cell configuration by assembling the same electrode materials as both the anode and the cathode, with a remarkable long-standing stability retaining ∼100% of the initial current after a 100 h long OWS run, which is attributed to the “synergistic coupling” between NiO QD catalysts and the CNTR matrix. Interestingly, the developed electrode exhibits a cell potential (E10) of only 1.81 V with significantly low NiO QD loading (83 μg/cm2) compared to other catalyst loading values reported in the literature. This study demonstrates a potential class of carbon-based electrodes with single-metal-based bifunctional catalysts that opens up a cost-effective and large-scale pathway for further development of catalysts and their loading engineering suitable for alkaline-based OWS applications and green hydrogen generation.