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Phase-Dependent Reactivity of Nickel Molybdates for Electrocatalytic Urea Oxidation
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-28 00:00:00 , DOI: 10.1021/acsaem.0c00968 Kailong Hu 1 , Samuel Jeong 1 , Ganesan Elumalai 1 , Suresh Kukunuri 1 , Jun-ichi Fujita 1 , Yoshikazu Ito 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-28 00:00:00 , DOI: 10.1021/acsaem.0c00968 Kailong Hu 1 , Samuel Jeong 1 , Ganesan Elumalai 1 , Suresh Kukunuri 1 , Jun-ichi Fujita 1 , Yoshikazu Ito 1, 2
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Identifying the influence of the phase of a catalyst on its reactivity is crucial for guiding the rational design of highly active electrocatalysts. Herein, we unveil the phase-dependent reactivity of nickel molybdates (NiMoO4) for the electrocatalytic urea oxidation reaction (UOR). Various NiMoO4 phases, namely, α-NiMoO4, β-NiMoO4, and the hydrate NiMoO4·xH2O, were synthesized, and their structural characteristics and electrochemical properties were related to their electrocatalytic performance for the UOR. The NiMoO4 phase was found to determine its reactivity, and phase-dependent UOR activities were observed. In particular, β-NiMoO4 exhibited a higher activity and faster kinetics than NiMoO4·xH2O and α-NiMoO4, which was attributed to the large electrochemical surface area, low Tafel slope, and small charge–transfer resistance of β-NiMoO4. Moreover, hydrogen generation via β-NiMoO4-catalyzed urea electrolysis achieved a much lower cell voltage (1.498 V to reach 10 mA cm–2) than that required for water electrolysis (1.633 V to reach 10 mA cm–2). This work provides insights into design strategies for high-activity electrocatalysts for energy-efficient hydrogen production.
中文翻译：
钼酸镍对电催化尿素氧化的相变反应性
鉴定催化剂相对其反应性的影响对于指导高活性电催化剂的合理设计至关重要。在这里，我们揭示了钼酸镍（NiMoO 4）对电催化尿素氧化反应（UOR）的相变反应性。各种NiMoO 4阶段，即，α-NiMoO 4，β-NiMoO 4，和水合物NiMoO 4 · X ^ h 2 O，合成，和它们的结构特征和电化学性能与它们的电UOR性能。NiMoO 4发现相确定其反应性，并且观察到相依赖性UOR活性。具体地，β-NiMoO 4表现出较高的活性和比NiMoO更快的动力学4 · X ^ h 2 O和α-NiMoO 4，这归因于大的电化学表面积，低塔菲尔斜率，和小电荷转移β的电阻-NiMoO 4。此外，通过β-NiMoO氢气产生4个催化的尿素电解实现低得多的电池电压（1.498 V至达到10毫安厘米-2）高于所需的电解水（1.633 V至达到10毫安厘米-2）。这项工作为高能效电催化剂生产高能效氢的设计策略提供了见识。
更新日期：2020-07-28
中文翻译：
钼酸镍对电催化尿素氧化的相变反应性
鉴定催化剂相对其反应性的影响对于指导高活性电催化剂的合理设计至关重要。在这里，我们揭示了钼酸镍（NiMoO 4）对电催化尿素氧化反应（UOR）的相变反应性。各种NiMoO 4阶段，即，α-NiMoO 4，β-NiMoO 4，和水合物NiMoO 4 · X ^ h 2 O，合成，和它们的结构特征和电化学性能与它们的电UOR性能。NiMoO 4发现相确定其反应性，并且观察到相依赖性UOR活性。具体地，β-NiMoO 4表现出较高的活性和比NiMoO更快的动力学4 · X ^ h 2 O和α-NiMoO 4，这归因于大的电化学表面积，低塔菲尔斜率，和小电荷转移β的电阻-NiMoO 4。此外，通过β-NiMoO氢气产生4个催化的尿素电解实现低得多的电池电压（1.498 V至达到10毫安厘米-2）高于所需的电解水（1.633 V至达到10毫安厘米-2）。这项工作为高能效电催化剂生产高能效氢的设计策略提供了见识。
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