Alves Daniele, Collins Gillian, Dalla Benetta Marilia B, Dempsey Eithne, Shim Jae-Jin, Karthik Raj, Breslin Carmel B
Department of Chemistry, Maynooth University, Maynooth, Co. Kildare W23 F2H6, Ireland.
Kathleen Lonsdale Institute, Maynooth University, Maynooth, Co, Kildare W23 F2H6, Ireland.
ACS Appl Energy Mater. 2025 Apr 7;8(8):5455-5467. doi: 10.1021/acsaem.5c00483. eCollection 2025 Apr 28.
Layered double hydroxides (LDH) have exhibited promising applications as electrocatalysts in oxygen evolution reactions (OER). In this work, trimetallic LDHs (CoNiFe-LDH) were designed and grown on graphene (G) through a one-step hydrothermal approach to obtain a structure that promotes efficient charge transfer. A 2-level full-factorial design was utilized to evaluate the effects of varying the concentrations of Co (1.5, 3, and 4.5 mmol) and graphene (10, 30, and 50 mg) on the OER activity. The potential needed to deliver 10 mA cm was chosen as the response parameter. The independent and dependent parameters were fitted to a linear model equation through ANOVA analysis. The computed -values were below 0.05 signifying the statistical significance of the concentrations of cobalt and graphene and their interaction, suggesting a correlation with the OER activity. The OER experiments were conducted in triplicate using the CoNiFe-LDH/G (central point) to estimate variability (0.58%). Comparative analysis showed that CoNiFe-LDH/G achieved the lowest onset potential (1.54 V), potential at 10 mA cm (1.58 V), and Tafel slope (58.4 mV dec), indicating that a low concentration of cobalt and graphene make an efficient electrocatalyst for OER. Furthermore, the optimized composite demonstrated favorable electronic properties, with a charge transfer resistance (R) of 188.1 Ω, and exhibited good stability, maintaining its catalytic activity with no significant loss over a 24-h period.
层状双氢氧化物（LDH）作为析氧反应（OER）中的电催化剂已展现出广阔的应用前景。在本工作中，通过一步水热法在石墨烯（G）上设计并生长了三金属LDH（CoNiFe-LDH），以获得促进有效电荷转移的结构。采用二水平全因子设计来评估改变Co（1.5、3和4.5 mmol）和石墨烯（10、30和50 mg）浓度对OER活性的影响。选择提供10 mA cm所需的电位作为响应参数。通过方差分析将独立参数和相关参数拟合到线性模型方程中。计算得到的p值低于0.05，表明钴和石墨烯的浓度及其相互作用具有统计学意义，这表明与OER活性存在相关性。使用CoNiFe-LDH/G（中心点）进行了三次重复的OER实验，以估计变异性（0.58%）。对比分析表明，CoNiFe-LDH/G实现了最低的起始电位（1.54 V）、10 mA cm时的电位（1.58 V）和塔菲尔斜率（58.4 mV dec），表明低浓度的钴和石墨烯构成了用于OER的高效电催化剂。此外，优化后的复合材料表现出良好的电子性能，电荷转移电阻（Rct）为188.1 Ω，并且具有良好的稳定性，在24小时内保持其催化活性且无明显损失。
