Hydrogen generation by seawater electrolysis is a sustainable approach to renewable-energy conversion which requires efficient catalyst to address challenges such as competing chlorine evolution reaction, chloride corrosion, and catalyst poisoning. Here, core-shell-structured CoP_x@FeOOH is designed for selective OER in seawater. This catalyst has high conductivity, large surface area, improved turnover frequency, and optimal absorption energy to OER intermediates, which together lead to excellent catalytic activity. The enhanced chemical stability and corrosion resistance ensure its catalytic performance in seawater. Specifically, it requires overpotentials of 283 and 337 mV to attain current densities of 100 and 500 mA cm⁻², respectively, in 1 M KOH seawater, with durability over 80 h of continuous testing without producing any hypochlorite. The CoP_x||CoP_x@FeOOH pair requires voltages of 1.710 and 1.867 V to attain current densities of 100 and 500 mA cm⁻² with a high Faradaic efficiency, showing its great promise for fuel-gas production from seawater.

海水电解制氢是可再生能源转化的可持续方法，它需要高效的催化剂来应对挑战，例如竞争性的氯释放反应，氯化物腐蚀和催化剂中毒。在这里，核壳结构的CoP _x @FeOOH是为海水中的选择性OER设计的。该催化剂具有高电导率，大表面积，改进的周转频率以及对OER中间体的最佳吸收能，这些共同带来了出色的催化活性。增强的化学稳定性和耐腐蚀性确保了其在海水中的催化性能。具体而言，它需要283和337 mV的过电势才能达到100和500 mA cm ^-2的电流密度分别在1 M KOH海水中，具有超过80小时连续测试的耐久性，且不会产生任何次氯酸盐。CoP _x || CoP _x @FeOOH对需要1.710和1.867 V的电压，以高法拉第效率实现100和500 mA cm ^-2的电流密度，显示了其从海水生产燃气的巨大前景。