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V-Doping Triggered Formation and Structural Evolution of Dendritic Ni3S2@NiO Core–Shell Nanoarrays for Accelerating Alkaline Water Splitting
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-04-13 , DOI: 10.1021/acssuschemeng.9b06959 Qianqian Liu 1 , Jianfeng Huang 1 , Liyun Cao 1 , Koji Kajiyoshi 2 , Kang Li 1 , Yongqiang Feng 1 , Changle Fu 1 , Lingjiang Kou 1 , Liangliang Feng 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-04-13 , DOI: 10.1021/acssuschemeng.9b06959 Qianqian Liu 1 , Jianfeng Huang 1 , Liyun Cao 1 , Koji Kajiyoshi 2 , Kang Li 1 , Yongqiang Feng 1 , Changle Fu 1 , Lingjiang Kou 1 , Liangliang Feng 1, 2
Affiliation
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Developing highly efficient electrocatalysts with hierarchical structures while revealing their electrochemical reaction mechanism is crucial for pushing commercial water splitting applications. Herein, a V-doping triggered self-assembly strategy is reported to synthesize dendritic V-Ni3S2@NiO core–shell nanoarrays on nickel foam (V-Ni3S2@NiO/NF), which consist of an ultrathin V-doped NiO nanoshell (2–7 nm) and high-crystalline Ni3S2 core. The unique hierarchical structure offers multidimensional mass and charge transport channels and plentiful catalytically active sites for water splitting reactions, resulting in improved water electrolysis kinetics. More importantly, benefiting from the rapid anodic oxidation and evolution process due to the partial leaching of vanadium(IV) in the V-Ni3S2@NiO/NF material, the highly active amorphous NiOOH phase is immediately generated on the surface of V-Ni3S2@NiO/NF (V-Ni3S2@NiO/NiOOH/NF), which contributes to enhancing the adsorption of OH– and exposing abundant unsaturated active sites and thus remarkably enhanced oxygen evolution reaction (OER) kinetics in basic electrolyte. Moreover, an alkaline electrolyzer assembled by V-Ni3S2@NiO/NF simultaneously functioning as both anode and cathode only needs an extremely small voltage of 1.52 V to yield 10 mA cm–2 and retains this activity for over 55 h. This work provides a new train of thought and tactics for the development of high-efficiency electrocatalysts for overall water splitting.
中文翻译：
V掺杂触发树枝状Ni 3 S 2 @NiO核壳纳米阵列的形成和结构演变，以加速碱性水的分解
开发具有分层结构的高效电催化剂，同时揭示其电化学反应机理，对于推动工业水分解应用至关重要。在此，据报道，V掺杂触发的自组装策略可以在泡沫镍（V-Ni 3 S 2 @ NiO / NF）上合成树枝状的V-Ni 3 S 2 @NiO核壳纳米阵列。掺杂的NiO纳米壳（2–7 nm）和高结晶Ni 3 S 2核心。独特的分层结构提供了多维的质量和电荷传输通道以及用于水分解反应的大量催化活性位点，从而改善了水的电解动力学。更重要的是，由于钒（IV）在V-Ni 3 S 2 @ NiO / NF材料中的部分浸出而得益于快速的阳极氧化和析出过程，高活性的非晶态NiOOH相立即在V表面生成-Ni 3 S 2 @ NiO / NF（V-Ni 3 S 2 @ NiO / NiOOH / NF），有助于增强OH的吸附–并暴露出丰富的不饱和活性位，从而显着增强了碱性电解质中的氧释放反应（OER）动力学。此外，由V-Ni 3 S 2 @ NiO / NF同时充当阳极和阴极的碱性电解槽仅需要极小的1.52 V电压即可产生10 mA cm –2的电流，并保持超过55小时的活性。这项工作为开发用于整体水分解的高效电催化剂提供了新的思路和策略。
更新日期：2020-04-23
中文翻译：
V掺杂触发树枝状Ni 3 S 2 @NiO核壳纳米阵列的形成和结构演变，以加速碱性水的分解
开发具有分层结构的高效电催化剂，同时揭示其电化学反应机理，对于推动工业水分解应用至关重要。在此，据报道，V掺杂触发的自组装策略可以在泡沫镍（V-Ni 3 S 2 @ NiO / NF）上合成树枝状的V-Ni 3 S 2 @NiO核壳纳米阵列。掺杂的NiO纳米壳（2–7 nm）和高结晶Ni 3 S 2核心。独特的分层结构提供了多维的质量和电荷传输通道以及用于水分解反应的大量催化活性位点，从而改善了水的电解动力学。更重要的是，由于钒（IV）在V-Ni 3 S 2 @ NiO / NF材料中的部分浸出而得益于快速的阳极氧化和析出过程，高活性的非晶态NiOOH相立即在V表面生成-Ni 3 S 2 @ NiO / NF（V-Ni 3 S 2 @ NiO / NiOOH / NF），有助于增强OH的吸附–并暴露出丰富的不饱和活性位，从而显着增强了碱性电解质中的氧释放反应（OER）动力学。此外，由V-Ni 3 S 2 @ NiO / NF同时充当阳极和阴极的碱性电解槽仅需要极小的1.52 V电压即可产生10 mA cm –2的电流，并保持超过55小时的活性。这项工作为开发用于整体水分解的高效电催化剂提供了新的思路和策略。
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