Hu Ruihang, Fan Chao, Wang Kang, Liu Pengfei, Wang Yan-Qin
Inner Mongolia Key Laboratory of Rare Earth Catalysis, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China.
Inner Mongolia Key Laboratory of Rare Earth Catalysis, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 3):138590. doi: 10.1016/j.jcis.2025.138590. Epub 2025 Jul 29.
Hydrogen production via seawater electrolysis is regarded as a promising avenue for utilizing sustainable energy. However, developing an efficient electrocatalyst with low overpotential and high chloride corrosion resistance remains a considerable challenge. In this research, a heterostructure NiCoP/Ce-NiCo LDH catalyst was fabricated by a simple hydrothermal-phosphorization-electrodeposition method. This catalyst features Ce-doped NiCo LDH nanosheets covering NiCoP nanoarrays. During seawater oxidation, the generated PO effectively inhibits ClO formation. The NiCoP/Ce-NiCo LDH catalyst delivers a current density of 100 mA cm with overpotentials of only 258 and 272 mV in alkaline freshwater and seawater, respectively. It also exhibits exceptional stability, maintaining a current density of 100 mA cm for 100 h in both alkaline freshwater and seawater. DFT calculations indicate that Ce doping and the heterostructure formation in NiCoP/Ce-NiCo LDH optimize the electronic structure of the catalyst and reduce the energy barrier of rate-determining step, synergistically enhancing OER performance. This study demonstrates a promising strategy for developing durable and highly active catalytic materials for seawater electrolysis.
通过海水电解制氢被认为是利用可持续能源的一条有前景的途径。然而，开发一种具有低过电位和高耐氯化物腐蚀性的高效电催化剂仍然是一个巨大的挑战。在本研究中，通过一种简单的水热-磷化-电沉积方法制备了一种异质结构的NiCoP/Ce-NiCo LDH催化剂。这种催化剂的特点是Ce掺杂的NiCo LDH纳米片覆盖在NiCoP纳米阵列上。在海水氧化过程中，生成的PO有效地抑制了ClO的形成。NiCoP/Ce-NiCo LDH催化剂在碱性淡水和海水中分别提供100 mA cm的电流密度，过电位仅为258和272 mV。它还表现出优异的稳定性，在碱性淡水和海水中均能保持100 mA cm的电流密度达100小时。密度泛函理论计算表明，NiCoP/Ce-NiCo LDH中的Ce掺杂和异质结构形成优化了催化剂的电子结构，降低了速率决定步骤的能垒，协同增强了析氧反应性能。这项研究展示了一种开发用于海水电解的耐用且高活性催化材料的有前景的策略。
