A hybrid NiCo2O4@NiMoO4 structure for overall water splitting and excellent hybrid energy storage.,Dalton Transactions

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A hybrid NiCo2O4@NiMoO4 structure for overall water splitting and excellent hybrid energy storage.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-06-17 , DOI: 10.1039/d0dt02021d
Duo Cui ₁ , Rongda Zhao ₁ , Jinqiu Dai ₁ , Jun Xiang ₁ , Fufa Wu ₁

Affiliation

In this study, a two-step hydrothermal method is used to prepare NiCo₂O₄@NiMoO₄ nanoscale materials for periodic stability supercapacitors. The synthesized product can be directly used as the electrode material of the supercapacitor, and its specific capacitance is 685.7 C g⁻¹. The composite electrode NiCo₂O₄@NiMoO₄ is used as the positive electrode and the hybrid capacitor is assembled. Meanwhile, at the power density of 4050 W kg⁻¹, the energy density is 96.3 W h kg⁻¹, and the capacitance retention is 100% after 10 000 cycles. At the same time, when the composite is used as a catalyst, it exhibits OER overvoltage (300 mV), HER overvoltage (170 mV) and a low battery voltage of 1.65 V at 10 mA cm⁻². After 14 hours of long-term use, NiCo₂O₄@NiMoO₄ maintained good stability, indicating that its structure further improved the electrochemical performance, providing a great advantage for the study of low-cost electrode materials for overall water splitting.

中文翻译：

NiCo2O4 @ NiMoO4混合结构，用于整体水分解和出色的混合能量存储。

在这项研究中，采用两步水热法制备用于周期性稳定性超级电容器的NiCo ₂ O ₄ @NiMoO ₄纳米级材料。合成产物可直接用作超级电容器的电极材料，其比电容为685.7 C g ^-1。将复合电极NiCo ₂ O ₄ @NiMoO ₄用作正极，并组装混合电容器。同时，在4050 W kg ^-1的功率密度下，能量密度为96.3 W h kg ^-1，并且在1万次循环后电容保持率为100％。同时，当将该复合物用作催化剂时，其在10mA cm ^-2下表现出OER过电压（300mV），HER过电压（170mV）和1.65V的低电池电压。长期使用14小时后，NiCo ₂ O ₄ @NiMoO ₄保持了良好的稳定性，表明其结构进一步改善了电化学性能，为研究用于整体水分解的低成本电极材料提供了很大的优势。

更新日期：2020-07-21

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