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Surface nitridation of nickel-cobalt alloy nanocactoids raises the performance of water oxidation and splitting
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2020-03-16 , DOI: 10.1016/j.apcatb.2020.118889
Xiaorui Gao , Yong Yu , Qirui Liang , Yajun Pang , Linqing Miao , Ximeng Liu , Zongkui Kou , Jiaqing He , Stephen J. Pennycook , Shichun Mu , John Wang

Surface engineering can disruptively raise the intrinsic performance of electrocatalytic materials. Herein, we propose a facile surface nitridation stretgy for nickel-cobalt alloy (Ni2Co-N) nanocactoids grown on carbon cloth in substantially raising the oxygen evolution reaction (OER) kinetics. Indeed, Ni2Co-N exhibits an ultralow OER overpotential of 214 mV at 10 mA cm–2 in alkaline media, together with a small Tafel slope of 53 mV dec-1, which not only breaks the cap of theoretical overpotential limit, but also is remarkably lower than those of the state-of-the-art 3d transition metal alloys and their derivatives. A nearly 100% Faraday efficiency with a low and stable cell voltage of 1.59 V is achieved by an alkaline water electrolyzer made of the bifunctional Ni2Co-N as both the anode and cathode catalysts. The chemical and structural origin of the high catalytic activity is established to root from the fast surface reconstruction of Ni2Co alloy precatalyst, peroxo O22- species-induced lattice oxygen oxidation mechanism, acceleration in electron transfer, as well as the large active surface area as a result of the surface nitridation. The present study provides a guideline to rationally design active and stable 3d transition metal catalysts towards water oxidation and splitting.



中文翻译:

镍钴合金纳米仙人掌的表面氮化可提高水的氧化和分解性能

表面工程可以破坏性地提高电催化材料的固有性能。本文中,我们提出了一种用于在碳布上生长的镍钴合金(Ni 2 Co-N)纳米仙人掌的表面氮化方法,该方法实质上可提高氧释放反应(OER)的动力学。实际上,在碱性介质中,Ni 2 Co-N在10 mA cm –2下具有214 mV的超低OER超电势,以及53 mV dec -1的小Tafel斜率,这不仅打破了理论超电势极限的上限,而且也显着低于最新的3 d过渡金属合金及其衍生物。通过由双功能Ni 2 Co-N作为阳极催化剂和阴极催化剂制成的碱性水电解槽,可实现1.59 V的低且稳定的电池电压,接近100%的法拉第效率。高催化活性的化学和结构起源可以从Ni 2 Co合金预催化剂的快速表面重建,过氧O 2 2-物种诱导的晶格氧氧化机理,电子转移的加速以及较大的活性中确定。表面氮化的表面积。本研究为合理设计活性和稳定的3d过渡金属催化剂进行水氧化和分解提供了指导。

更新日期:2020-03-16
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