Department of Energy Systems and Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST) , 50-1 Sang-Ri, Hyeongpung-Myeon, Dalseong-gun, Daegu 42988, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Apr 12;9(14):12416-12426. doi: 10.1021/acsami.7b00353. Epub 2017 Mar 30.
One of the important challenges in alkaline water electrolysis is to utilize a bifunctional catalyst for both hydrogen evolution (HER) and oxygen evolution (OER) reactions to increase the efficiency of water splitting devices for the long durable operations. Herein, nickel-cobalt-titanium (NCT) alloy is directly grown on a high corrosion resistance titanium foil by a simple, single, and rapid electrochemical deposition at room temperature. The electrocatalytic activity of NCT alloy electrodes is evaluated for both HER and OER in aqueous electrolyte. Our NCT electrocatalyst exhibits low overpotentials around 125 and 331 mV for HER and OER, respectively, in 1 M KOH. In addition to this outstanding activity, the bifunctional catalyst also exhibits excellent OER and HER electrode stability up to 150 h of continuous operation with a minimal loss in activity. Further, the NCT alloy directly grown on titanium foil is used to directly construct membrane electrode assembly (MEA) for alkaline electrolyte membrane (AEM) water electrolyzer, which make the practical applicability. This single-step electrodeposition reveals NCT on titanium foil with high activity and excellent electrode stability suitable for replacing alternative commercial viable catalyst for the alkaline water splitting.
在碱性水电解中，一个重要的挑战是利用双功能催化剂来同时进行析氢（HER）和析氧（OER）反应，以提高水分解装置的效率，实现长期稳定运行。在此，通过在室温下进行简单、单一且快速的电化学沉积，将镍钴钛（NCT）合金直接生长在高耐腐蚀性钛箔上。评估了 NCT 合金电极在水溶液中的 HER 和 OER 的电催化活性。我们的 NCT 电催化剂在 1 M KOH 中分别表现出约 125 和 331 mV 的低过电势，用于 HER 和 OER。除了这种出色的活性之外，该双功能催化剂还表现出优异的 OER 和 HER 电极稳定性，连续运行 150 小时后，活性损失最小。此外，直接生长在钛箔上的 NCT 合金被用于直接构建碱性电解质膜（AEM）水电解槽的膜电极组件（MEA），使其具有实际适用性。这种单步电沉积在钛箔上展示了具有高活性和优异电极稳定性的 NCT，适合替代替代商业可行的碱性水分解催化剂。
