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Triggering the Intrinsic Catalytic Activity of Ni-Doped Molybdenum Oxides via Phase Engineering for Hydrogen Evolution and Application in Mg/Seawater Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-09-14 , DOI: 10.1021/acssuschemeng.1c05184 Teng Yang 1 , Yingshuang Xu 1 , Honghao Lv 1 , Min Wang 1 , Xuejing Cui 1 , Guangbo Liu 1 , Luhua Jiang 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-09-14 , DOI: 10.1021/acssuschemeng.1c05184 Teng Yang 1 , Yingshuang Xu 1 , Honghao Lv 1 , Min Wang 1 , Xuejing Cui 1 , Guangbo Liu 1 , Luhua Jiang 1
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Molybdenum oxides have been regarded as promising non-noble metal electrocatalysts for hydrogen evolution reaction (HER) due to their low cost, nontoxicity, and chemical stability. However, promoting the intrinsic catalytic activity of molybdenum oxides is crucial for achieving high HER performance. Herein, we demonstrate that the intrinsic HER activity of Ni-doped molybdenum oxides is triggered via a thermal treatment induced phase engineering strategy. The HER overpotential at 10 mA cm–2 decreases from 493 mV (1 M KOH) and 818 mV (seawater) over Ni-doped molybdenum trioxide (Ni-MoO3) to only 234 and 412 mV over Ni-doped molybdenum dioxide (Ni-MoO2), respectively. Moreover, the electrochemical surface areas (ECSAs)-normalized current density over Ni-MoO2, as compared to Ni-MoO3, is at least a 35-fold increase in alkaline (at −0.2 V vs reversible hydrogen electrode (RHE)) and a 59-fold increase in seawater (at −0.4 V vs RHE), confirming the significantly triggered intrinsic HER activity via engineering orthorhombic MoO3 to monoclinic MoO2. Finally, an assembled Mg/seawater battery with the Ni-MoO2 cathode reveals a peak power density of 6.54 mW cm–2 and a continuous stable discharge for over 24 h. This study offers a facile strategy for promoting the intrinsic HER activity of non-noble metal electrocatalysts.
中文翻译：
通过相工程触发 Ni 掺杂钼氧化物的本征催化活性在镁/海水电池中的析氢和应用
钼氧化物由于其低成本、无毒和化学稳定性而被认为是用于析氢反应（HER）的有前途的非贵金属电催化剂。然而，提高钼氧化物的内在催化活性对于实现高 HER 性能至关重要。在此，我们证明了 Ni 掺杂钼氧化物的固有 HER 活性是通过热处理诱导相工程策略触发的。10 mA cm –2 下的 HER 过电位从掺镍三氧化钼 (Ni-MoO 3 ) 的493 mV (1 M KOH) 和 818 mV（海水）降低到掺镍二氧化钼 (Ni ) 的 234 和 412 mV -MoO 2 )，分别。此外，Ni-MoO 上的电化学表面积 (ECSA) 归一化电流密度2，与Ni-MoO 3相比，碱性增加至少35倍（-0.2 V vs可逆氢电极（RHE））和海水增加59倍（-0.4 V vs RHE），通过将斜方晶 MoO 3工程化为单斜晶 MoO 2来确认显着触发的内在 HER 活性。最后，带有 Ni-MoO 2阴极的组装镁/海水电池的峰值功率密度为 6.54 mW cm –2并且连续稳定放电超过 24 小时。该研究为促进非贵金属电催化剂的固有 HER 活性提供了一种简便的策略。
更新日期：2021-09-27
中文翻译：
通过相工程触发 Ni 掺杂钼氧化物的本征催化活性在镁/海水电池中的析氢和应用
钼氧化物由于其低成本、无毒和化学稳定性而被认为是用于析氢反应（HER）的有前途的非贵金属电催化剂。然而，提高钼氧化物的内在催化活性对于实现高 HER 性能至关重要。在此，我们证明了 Ni 掺杂钼氧化物的固有 HER 活性是通过热处理诱导相工程策略触发的。10 mA cm –2 下的 HER 过电位从掺镍三氧化钼 (Ni-MoO 3 ) 的493 mV (1 M KOH) 和 818 mV（海水）降低到掺镍二氧化钼 (Ni ) 的 234 和 412 mV -MoO 2 )，分别。此外，Ni-MoO 上的电化学表面积 (ECSA) 归一化电流密度2，与Ni-MoO 3相比，碱性增加至少35倍（-0.2 V vs可逆氢电极（RHE））和海水增加59倍（-0.4 V vs RHE），通过将斜方晶 MoO 3工程化为单斜晶 MoO 2来确认显着触发的内在 HER 活性。最后，带有 Ni-MoO 2阴极的组装镁/海水电池的峰值功率密度为 6.54 mW cm –2并且连续稳定放电超过 24 小时。该研究为促进非贵金属电催化剂的固有 HER 活性提供了一种简便的策略。
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