N Srinivasa, L Shreenivasa, Adarakatti Prashanth S, Hughes Jack P, Rowley-Neale Samuel J, Banks Craig E, S Ashoka
Department of Chemistry, School of Engineering, Dayananda Sagar University Bangalore India
PG Department of Chemistry, KLE's PC Jabin Science College Hubballi India.
RSC Adv. 2019 Aug 12;9(43):24995-25002. doi: 10.1039/c9ra05195c. eCollection 2019 Aug 8.
We present a rapid, environmentally benign one-pot synthesis technique for the production of a NiCoO/CoO and graphite composite that demonstrates efficient electrocatalysis towards the Oxygen Evolution Reaction (OER), in 1.0 M KOH. The NiCoO/CoO/graphitic carbon composite that displayed optimal OER catalysis was synthesized by nitrate decomposition in the presence of citric acid (synthesized glycine and sucrose variants displayed inferior electro kinetics towards the OER). Screen-printed electrodes modified with . 530 μg cm of the citric acid NiCoO/CoO/graphite variant displayed remarkable OER catalysis with an overpotential () of +323 mV ( RHE) (recorded at 10 mA cm), which is superior to that of IrO (340 mV) and RuO (350 mV). The composite also exhibited a large achievable current density of 77 mA cm (at +1.5 V ( RHE)), a high O turnover frequency of 1.53 × 10 s and good stability over the course of 500 repeat cycles. Clearly, the NiCoO/CoO composite has the potential to replace precious metal based catalysts as the anodic material within electrolysers, thereby providing a reduction in the associated costs of hydrogen production water splitting.
我们展示了一种快速、环境友好的一锅合成技术，用于制备NiCoO/CoO与石墨的复合材料，该复合材料在1.0 M KOH中对析氧反应（OER）表现出高效的电催化性能。通过在柠檬酸存在下进行硝酸盐分解合成了表现出最佳OER催化性能的NiCoO/CoO/石墨碳复合材料（合成的甘氨酸和蔗糖变体对OER表现出较差的电动力学性能）。用530 μg cm的柠檬酸NiCoO/CoO/石墨变体修饰的丝网印刷电极在10 mA cm下记录的过电位（）为+323 mV（相对于可逆氢电极（RHE）），表现出显著的OER催化性能，优于IrO（340 mV）和RuO（350 mV）。该复合材料还表现出在+1.5 V（相对于RHE）时可达到77 mA cm的大电流密度、1.53×10 s的高O周转频率以及在500次重复循环过程中的良好稳定性。显然，NiCoO/CoO复合材料有潜力替代基于贵金属的催化剂作为电解槽中的阳极材料，从而降低制氢（水分解）的相关成本。
