The introduction of MoS2 improves the electrochemical performance of NiFeCr-LDH. The polarization curve shows that the potential of composite material is only 1.50 V at a current density of 10 mA cm, which is far superior to commercial precious metal catalysts. In addition, the stability ...
得益于增强的OER活性和加速的电荷转移,制备的Cr-NiFe LDH@CuO催化剂表现出优异的OER活性,在100 mA cm-2下具有270 mV的低电位,Tafel斜率很小,为46.9 mV / dec1。由Cr-NiFe LDH@CuO和Pt/C组装的电解槽需要1.56 V的低电压才能达到100 mA cm-2。再加上优异的耐久性,所得到的Cr-NiFe LDH@CuO电催化剂被证...
此外,NiFeCr-LDH证明了其在阴离子交换膜电解槽中作为阳极催化剂的可行性,与NiMoCo合金阴极结合以促进水分解,或与Ag阴极结合以催化CO2转化为CO,从而产生较低的全电池电压在高电流密度。作者认为这种operando的高价态掺杂策略将为合理设计高效的多金属OER催化剂提供一条新的途径。
研究人员通过理论计算与X射线吸收精细结构谱等表征证明了工况高价Cr掺杂剂和双金属NiFe位点之间的强电子相互作用。基于NiFeCr-LDH的高效OER催化活性,研究团队进一步组装了接近工业催化体系的碱性膜电极组件流动反应池,将NiFeCr-LDH阳极分别与NiM...
In this context, the electrochemical detection of Cr(VI), Sb(V), As(III), As(V) and Tl(III) has been performed using differential pulse anodic stripping voltammetry (DPASV) on a glassy carbon electrode modified with CoFe2O4@NiFe LDH. The anticipated active sites, such as the surface ...
(OER)是水分解电解池,可充电金属空气电池等能源存储与转换装置中的重要反应,但是OER过程为四电子-质子耦合反应,这导致反应动力学缓慢并限制了能源转换效率,因此人们致力于OER电催化剂的结构设计和反应机理的研究,以期望开发出具有高活性的和性能稳定的催化剂.其中基于非贵金属的镍铁层状双氢氧化物(NiFe-LDH)是一类...
Excellent OER activity is demonstrated by the MoS2/NiFeCr LDH catalyst, which only needs an overpotential of 224 mV to obtain a current density of 10 mA cm2 and a Tafel slope of 61 mV dec1. The catalyst also demonstrated outstanding stability, with its activity practically holding steady ...
基于此,华东理工大学刘鹏飞博士和Hai Yang Yuan(共同通讯作者)等人报道了以多金属层状双氢氧化物(LDH)作为OER催化剂,引入了一系列高价态掺杂剂(Cr、Ru、Ce和V),它们可以限制LDH模板中的3+价态,以防止在OER过程中,相分离和操作数转移到>3+价态以实现足够的电子相互作用。
Electrochemical testing of a series of trimetallic NiFeCr LDH materials at similar catalyst loading and electrochemical surface area shows that the molar ratio Ni:Fe:Cr = 6:2:1 exhibits the best intrinsic OER catalytic activity compared to other NiFeCr LDH compositions. Furthermore, these ...
? 2024 Hydrogen Energy Publications LLCCr doping is a new strategy to enhance the OER (Oxygen Evolution Reaction) performance of NiFe-LDH (NiFe-Layered Double Hydroxides) by optimizing surface states and offering a scalable production process. However, as an additive element, Cr itself has weak ...