Ni/CrN高效电催化剂的制备及其析氢催化性能

Preparation of Ni/CrN High-Efficiency Electrocatalyst and its Catalytic Performance in Hydrogen Evolution Reaction

氢能是一种具有高能量密度的清洁能源,如何有效的开发绿氢技术是当前社会首要解决的问题,而研发高效稳定的电解水产氢技术的电催化剂是一种可行性的方式,对促进氢能经济的发展具有重要的意义。通过水热-高温热解两步法合成了一种氮化铬支撑镍纳米颗粒的催化剂(Ni/CrN)。利用XRD、XPS、SEM以及TEM等测试手段对催化剂的形貌及结构进行表征,并在碱性环境下对催化剂进行电催化析氢性能的研究。结果表明,Ni/CrN形成了具有珊瑚状的微观结构,优化了电子结构,并且表现出了优异的析氢反应(HER)催化性能,在10 mA/cm^(2)的电流密度下,Ni/CrN催化剂仅有66 mV的过电位和47 mV/dec的Tafel斜率,十分接近商业的Pt/C催化剂的析氢性能。在10 mA/cm^(2)电流密度的循环稳定性测试中,Ni/CrN表现出比商业Pt/C电极更优越的催化稳定性。

Hydrogen energy is a kind of clean energy with a high energy density.It is a primary problem that how to effectively develop green hydrogen technology in the current society.This is a feasible method to study efficient and stable electrocatalysts,which is of great significance to promote the development of hydrogen economy.Nickel-supported chromium nitride catalyst(Ni/CrN)was synthesized by a two-step hydrothermal-ammoniolysis method.The morphology and structure of Ni/CrN were confirmed by XRD,XPS,SEM and TEM,respectively.The hydrogen evolution performance of Ni/CrN was studied in alkaline environments.The results showed that the HER overpotential of Ni/CrN catalyst was 66 mV and the Tafel slope is only 47 mV/dec at the current density of 10 mA/cm^(2),which was very close to the performance of the commercial Pt/C catalyst.In the cycle stability test of current density of 10 mA/cm^(2),Ni/CrN showed less voltage drop than commercial Pt/C electrodes,showing excellent stability.