Efficient seawater electrolysis has become one of the promising strategies for sustainable hydrogen production,while the oxygen evolution reaction(OER)in chloride-rich environments is hindered by slow kinetics and the...Efficient seawater electrolysis has become one of the promising strategies for sustainable hydrogen production,while the oxygen evolution reaction(OER)in chloride-rich environments is hindered by slow kinetics and the competitive chlorine evolution reaction(ClER).This study presents a chromium-doped Ni-Fe oxyhydroxide catalyst(Cr_(x)Ni-FeOOH/NF)synthesized via a two-step hydrothermal method,enabling enhanced OER activity and chloride resistance.The optimized Cr_(M)Ni-FeOOH/NF catalyst achieves a low overpotential of 230 mV at 100 mA cm^(-2) with a competitive Tafel slope of 57.1 mV dec^(-1),reflecting accelerated reaction kinetics due to Cr^(3+)-induced electronic modulation.Cr doping optimizes oxygen intermediate adsorption and forms a hydroxyl-rich surface to repel Cl^(-),suppressing chlorine evolution by>99.7%.While chromium leaching from the catalyst surface was observed during long-term operation,the optimized Cr_(M)Ni-FeOOH/NF exhibited less than 3% activity loss over 100 hours under high Cl^(-)conditions,highlighting the initial efficacy of Cr in enhancing OER kinetics and chloride resistance.Furthermore,the catalyst demonstrated robust performance in an anion-exchange membrane electrolyzer,maintaining stable operation at 200 mA cm^(-2) for over 40 hours.This work bridges material design and device validation,offering a scalable strategy for durable simulated seawater electrolysis to advance sustainable hydrogen production.展开更多
基金the Research Development Fund(No.RDF-21-02-060)of Xi’an Jiaotong-Liverpool Universitythe support received from the Suzhou Industrial Park High Quality Innovation Platform of Functional Molecular Materials and Devices(YZCXPT2023105).
文摘Efficient seawater electrolysis has become one of the promising strategies for sustainable hydrogen production,while the oxygen evolution reaction(OER)in chloride-rich environments is hindered by slow kinetics and the competitive chlorine evolution reaction(ClER).This study presents a chromium-doped Ni-Fe oxyhydroxide catalyst(Cr_(x)Ni-FeOOH/NF)synthesized via a two-step hydrothermal method,enabling enhanced OER activity and chloride resistance.The optimized Cr_(M)Ni-FeOOH/NF catalyst achieves a low overpotential of 230 mV at 100 mA cm^(-2) with a competitive Tafel slope of 57.1 mV dec^(-1),reflecting accelerated reaction kinetics due to Cr^(3+)-induced electronic modulation.Cr doping optimizes oxygen intermediate adsorption and forms a hydroxyl-rich surface to repel Cl^(-),suppressing chlorine evolution by>99.7%.While chromium leaching from the catalyst surface was observed during long-term operation,the optimized Cr_(M)Ni-FeOOH/NF exhibited less than 3% activity loss over 100 hours under high Cl^(-)conditions,highlighting the initial efficacy of Cr in enhancing OER kinetics and chloride resistance.Furthermore,the catalyst demonstrated robust performance in an anion-exchange membrane electrolyzer,maintaining stable operation at 200 mA cm^(-2) for over 40 hours.This work bridges material design and device validation,offering a scalable strategy for durable simulated seawater electrolysis to advance sustainable hydrogen production.
