Ou Wanjun, Zhang Wenbiao, Qin Haoran, Zhou Weijia, Tang Yi, Gao Qingsheng
College of Chemistry and Materials Science, and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University Guangzhou 510632, PR China.
College of Chemistry and Materials Science, and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University Guangzhou 510632, PR China; Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, PR China.
J Colloid Interface Sci. 2024 Feb;655:852-862. doi: 10.1016/j.jcis.2023.11.054. Epub 2023 Nov 10.
Designing highly active electrocatalysts that can resist chloride ion (Cl) corrosion during seawater electrolysis is still a challenge. Here, Mo-doping is introduced to synchronously improve the electrocatalytic activity and anti-chlorine corrosion of NiS toward the efficient overall seawater splitting. With commercial nickel-molybdenum foam (NMF) as the reactive substrates, Mo-doped NiS columnar arrays (Mo-NiS/NMF) are fabricated via a one-step hydrothermal process, which expose abundant active sites with the ameliorated surface electronic configurations toward the enhanced binding with OH ( denotes an active site) but the weakened one with *Cl. As expected, they afford the excellent bi-functionality for both oxygen and hydrogen evolution reactions (OER and HER), with the remarkably improved anti-corrosion to Cl at anode as compared to pristine NiS. In alkaline mimic seawater (1.0 M NaOH + 0.5 M NaCl), Mo-NiS/NMF requires 330 mV (for OER) and 209 mV (for HER) overpotentials at the current density of ±100 mA cm, and a low cell voltage of 1.52 V at 10 mA cm for overall seawater splitting. This work highlights a feasible strategy to explore highly active and stable electrocatalysts for sustainable H production.
设计出在海水电解过程中能够抵抗氯离子（Cl⁻）腐蚀的高活性电催化剂仍然是一项挑战。在此，引入钼掺杂以同步提高硫化镍（NiS）对高效全海水分解的电催化活性和抗氯腐蚀能力。以商业镍钼泡沫（NMF）作为反应基底，通过一步水热法制备出钼掺杂的NiS柱状阵列（Mo-NiS/NMF），其具有丰富的活性位点，表面电子构型得到改善，与*OH（表示活性位点）的结合增强，但与Cl的结合减弱。正如预期的那样，它们对析氧反应（OER）和析氢反应（HER）均具有优异的双功能特性，与原始NiS相比，在阳极对Cl⁻的抗腐蚀能力显著提高。在碱性模拟海水（1.0 M NaOH + 0.5 M NaCl）中，Mo-NiS/NMF在电流密度为±100 mA cm⁻²时，析氧过电位为330 mV，析氢过电位为209 mV，在10 mA cm⁻²下进行全海水分解时的电池电压低至1.52 V。这项工作突出了一种探索用于可持续制氢的高活性和稳定电催化剂的可行策略。
