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CoMoP/NiFe-Layered Double-Hydroxide Hierarchical Nanosheet Arrays Standing on Ni Foam for Efficient Overall Water Splitting
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-30 00:00:00 , DOI: 10.1021/acsaem.0c01538 Wanshan Mai 1 , Qian Cui 1 , Ziqiong Zhang 1 , Kaikai Zhang 1 , Guoqiang Li 1 , Lihong Tian 1 , Wei Hu 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-30 00:00:00 , DOI: 10.1021/acsaem.0c01538 Wanshan Mai 1 , Qian Cui 1 , Ziqiong Zhang 1 , Kaikai Zhang 1 , Guoqiang Li 1 , Lihong Tian 1 , Wei Hu 1
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For efficient water splitting and replacement of expensive Pt or Ir with the earth-abundant materials, we have designed a heterostructure based on the two-dimensional (2D) bimetallic phosphide and layered double hydroxide (LDH) to construct the electrode assembly (i.e., CoxMo1P/NiFe-LDH) and observed its catalytic activities for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting. The optimized Co5.0Mo1P/NiFe-LDH hybrid obtained via the hydrothermal–phosphating–electrodeposition process consists of hierarchical nanosheet arrays including some silky and ultrathin NiFe-LDH nanosheets and numerous tiny and cross-linking Co5.0Mo1P nanoplates. Electrochemical tests display that Ni foam (NF)/Co5.0Mo1P/NiFe-LDH not only exhibits outstanding performance toward both HER and OER with an HER overpotential (η at 10 mA/cm2) of 98.9 mV and an OER overpotential (at 50 mA/cm2) of 225 mV outperforming NF/Co5.0Mo1P and NF/CoP but also presents superb stability in 1.0 M KOH. Moreover, it affords a cell voltage for water splitting of 1.68 V at 50 mA/cm2 with an excellent durability for more than 27 h. The abundant and intensive exposure of active sites provided by 2D porous and hierarchical nanosheet arrays and a strong electronic coupling and fast electronic transmission between various interfaces would explain the improved performance. In addition, the anchor effect between Co/Mo phosphides and NiFe-LDHs prevents corrosion of electrolyte solution and slows down the dissolution of the P element. This efficient and highly stable bifunctional electrode can serve as a practical electrode for electrochemical energy storage and conversion.
中文翻译：
CoMoP / NiFe层状双氢氧化物分层纳米片阵列站在Ni泡沫上以实现有效的总水分解
为了有效地进行水分解并用富含地球的材料替代昂贵的Pt或Ir，我们设计了一种基于二维（2D）双金属磷化物和层状双氢氧化物（LDH）的异质结构，以构建电极组件（即Co x Mo 1 P / NiFe-LDH）并观察到其对氢气析出反应（HER），氧气析出反应（OER）和总水分解的催化活性。通过水热-磷化-电沉积工艺获得的优化的Co 5.0 Mo 1 P / NiFe-LDH杂化体由分层的纳米片阵列组成，包括一些丝状和超薄的NiFe-LDH纳米片以及许多微小且交联的Co 5.0 Mo 1P纳米板。电化学测试表明，Ni泡沫（NF）/ Co 5.0 Mo 1 P / NiFe-LDH不仅具有98.9 mV的HER过电势（η在10 mA / cm 2时为η）和OER过电势（在10 mA / cm 2时，对HER和OER均具有出色的性能）。在50 mA / cm 2时，其225 mV的性能优于NF / Co 5.0 Mo 1 P和NF / CoP，但在1.0 M KOH中也表现出极好的稳定性。此外，它在50 mA / cm 2下提供1.68 V的水分解电池电压具有超过27小时的出色耐久性。2D多孔和分层纳米片阵列提供的大量活跃的活性位点曝光以及各种接口之间的强电子耦合和快速电子传输将说明性能的提高。此外，Co / Mo磷化物与NiFe-LDHs之间的锚固作用可防止电解质溶液腐蚀，并减慢P元素的溶解。这种高效且高度稳定的双功能电极可用作电化学能量存储和转换的实用电极。
更新日期：2020-07-30
中文翻译：
CoMoP / NiFe层状双氢氧化物分层纳米片阵列站在Ni泡沫上以实现有效的总水分解
为了有效地进行水分解并用富含地球的材料替代昂贵的Pt或Ir，我们设计了一种基于二维（2D）双金属磷化物和层状双氢氧化物（LDH）的异质结构，以构建电极组件（即Co x Mo 1 P / NiFe-LDH）并观察到其对氢气析出反应（HER），氧气析出反应（OER）和总水分解的催化活性。通过水热-磷化-电沉积工艺获得的优化的Co 5.0 Mo 1 P / NiFe-LDH杂化体由分层的纳米片阵列组成，包括一些丝状和超薄的NiFe-LDH纳米片以及许多微小且交联的Co 5.0 Mo 1P纳米板。电化学测试表明，Ni泡沫（NF）/ Co 5.0 Mo 1 P / NiFe-LDH不仅具有98.9 mV的HER过电势（η在10 mA / cm 2时为η）和OER过电势（在10 mA / cm 2时，对HER和OER均具有出色的性能）。在50 mA / cm 2时，其225 mV的性能优于NF / Co 5.0 Mo 1 P和NF / CoP，但在1.0 M KOH中也表现出极好的稳定性。此外，它在50 mA / cm 2下提供1.68 V的水分解电池电压具有超过27小时的出色耐久性。2D多孔和分层纳米片阵列提供的大量活跃的活性位点曝光以及各种接口之间的强电子耦合和快速电子传输将说明性能的提高。此外，Co / Mo磷化物与NiFe-LDHs之间的锚固作用可防止电解质溶液腐蚀，并减慢P元素的溶解。这种高效且高度稳定的双功能电极可用作电化学能量存储和转换的实用电极。
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