Srinivas Katam, Chen Yuanfu, Wang Bin, Yu Bo, Lu Yingjiong, Su Zhe, Zhang Wanli, Yang Dongxu
School of Electronic Science and Engineering, and State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
School of Science, and Institute of Oxygen Supply, Tibet University, Lhasa 850000, PR China.
ACS Appl Mater Interfaces. 2020 Dec 16;12(50):55782-55794. doi: 10.1021/acsami.0c13836. Epub 2020 Dec 1.
Strategic design and fabrication of a highly efficient and cost-effective bifunctional electrocatalyst is of great significance in water electrolysis in order to produce sustainable hydrogen fuel in a large scale. However, it is still challenging to develop a stable, inexpensive, and efficient bifunctional electrocatalyst that can overcome the sluggish oxygen evolution kinetics in water electrolysis. To address the aforementioned concerns, a metal-organic framework-derived Fe-doped NiFe/NiFeO heterostructural nanoparticle-embedded carbon nanotube (CNT) matrix (Fe(0.2)/Ni-M@C-400-2h) is synthesized via a facile hydrothermal reaction and subsequent carbonization of an earth-abundant Ni/Fe/C precursor. With a novel porous nanoarchitecture fabricated by a NiFe/NiFeO heterostructure on a highly conductive CNT matrix, this catalyst exhibits exceptional bifunctional activity during water electrolysis over the Ni/Fe-based electrocatalysts reported recently. It delivers a low overpotential of 250 mV to achieve a current density of 10 mA/cm with a small Tafel slope of 43.4 mV/dec for oxygen evolution reaction. It requires a low overpotential of 128 mV (η) for hydrogen evolution reaction and displays a low overpotential of 1.62 V (η) for overall water splitting. This study introduces a facile and straightforward synthesis strategy to develop transition metal-based nanoarchitectures with high performance and durability for overall water-splitting catalysis.
为了大规模生产可持续的氢燃料，高效且经济高效的双功能电催化剂的战略设计和制造在水电解中具有重要意义。然而，开发一种能够克服水电解中缓慢析氧动力学的稳定、廉价且高效的双功能电催化剂仍然具有挑战性。为了解决上述问题，通过简便的水热反应以及对富含地球元素的Ni/Fe/C前驱体进行后续碳化，合成了一种金属有机框架衍生的、嵌入Fe掺杂的NiFe/NiFeO异质结构纳米颗粒的碳纳米管（CNT）基质（Fe(0.2)/Ni-M@C-400-2h）。该催化剂具有由NiFe/NiFeO异质结构在高导电CNT基质上构建的新型多孔纳米结构，在水电解过程中表现出优于最近报道的基于Ni/Fe的电催化剂的双功能活性。在析氧反应中，它实现10 mA/cm²电流密度时的过电位低至250 mV，塔菲尔斜率小至43.4 mV/dec。析氢反应需要的过电位低至128 mV（η），全水解所需的过电位低至1.62 V（η）。本研究引入了一种简便直接的合成策略，以开发用于全水解催化的具有高性能和耐久性的过渡金属基纳米结构。
