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Rare-Earth Doping Transitional Metal Phosphide for Efficient Hydrogen Evolution in Natural Seawater
Small Structures ( IF 13.9 ) Pub Date : 2022-12-08 , DOI: 10.1002/sstr.202200268
Xianhong Wu 1 , Jieshan Qiu 1, 2 , Zhiyu Wang 1
Affiliation  

Electrolysis of inexhaustible seawater offers a promising way for harvesting practically infinite hydrogen energy without worsening freshwater shortage. Complicated ionic environment of saline seawater, however, places a great burden on catalyst performance for hydrogen evolution. Herein, tailoring the electronic structure of transitional metal phosphide by rare-earth doping for effectively propelling hydrogen evolution in a wide pH range and natural seawater is reported. The rare-earth doping leads to not only a nearly zero Gibbs free energy of H* adsorption and lower work function but also faster OH* desorption for rapid release of the active sites, thereby accelerating the hydrogen evolution reaction (HER) kinetics under nonacidic conditions. On this basis, highly conductive and hydrophilic MXene is introduced to further boost the adsorption of hydrogen carriers and charge transfer across the catalyst. Together, they allow the activity, kinetics, and durability of the electrocatalyst for HER to be improved overall. The obtained electrocatalyst shows superior activity to commercial Pt/C in terms of specific surface area and active mass and turnover frequency, as well as 400 times longer lifetime than Pt/C with high Faradaic efficiency in natural seawater. This study presents new insight into the development of viable electrocatalysts for harvesting hydrogen energy from abundant-reserve seawater.

中文翻译:

用于天然海水中高效析氢的稀土掺杂过渡金属磷化物

取之不尽用之不竭的海水的电解提供了一种有前途的方法,可以在不加剧淡水短缺的情况下收集几乎无限的氢能。然而,含盐海水复杂的离子环境对催化剂的析氢性能造成了很大的负担。在此,报道了通过稀土掺杂调整过渡金属磷化物的电子结构,以有效地促进宽 pH 范围和天然海水中的氢析出。稀土掺杂不仅导致 H* 吸附的吉布斯自由能几乎为零,功函数降低,而且 OH* 解吸更快,从而快速释放活性位点,从而加速非酸性条件下的析氢反应 (HER) 动力学. 以这个为基础,引入了高导电性和亲水性的 MXene,以进一步促进氢载体的吸附和催化剂上的电荷转移。它们共同提高了 HER 电催化剂的活性、动力学和耐久性。所获得的电催化剂在比表面积、活性质量和周转频率方面表现出优于商业 Pt/C 的活性,并且在天然海水中具有高法拉第效率的 Pt/C 寿命长 400 倍。这项研究为开发用于从储量丰富的海水中收集氢能的可行电催化剂提供了新的见解。所获得的电催化剂在比表面积、活性质量和周转频率方面表现出优于商业 Pt/C 的活性,并且在天然海水中具有高法拉第效率的 Pt/C 寿命长 400 倍。这项研究为开发用于从储量丰富的海水中收集氢能的可行电催化剂提供了新的见解。所获得的电催化剂在比表面积、活性质量和周转频率方面表现出优于商业 Pt/C 的活性,并且在天然海水中具有高法拉第效率的 Pt/C 寿命长 400 倍。这项研究为开发用于从储量丰富的海水中收集氢能的可行电催化剂提供了新的见解。
更新日期:2022-12-08
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