Magnetoelectrocatalysis: Evidence from the Hydrogen Evolution Reaction

IF 3.7 Q2 CHEMISTRY, PHYSICAL
Krysti L. Knoche Gupta, Heung Chan Lee and Johna Leddy*, 
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引用次数: 0

Abstract

Hydrogen evolution reaction (HER) rates are higher where magnetic gradients are established at electrode surfaces. In comparison of literature data for metals with comparable work functions, we note 1000× higher rates for paramagnetic metals than diamagnetic metals. With unpaired electron spins, paramagnetic and ferromagnetic metals establish interfacial magnetic gradients. At diamagnetic electrodes, gradients are induced by addition of magnetized microparticles. Onset of hydrogen evolution for magnetized γ-Fe2O3 microparticles in Nafion on diamagnetic glassy carbon electrodes is lower by 190 mV (−18 kJ mol–1) relative to demagnetized microparticles. Chemically the same as demagnetized particles, the physical distinction of magnetic field and gradient at magnetized microparticles increases electron transfer rate. For magnetized Fe3O4 microparticles, the onset is lower by 280 mV (−27 kJ mol–1). Paramagnetic platinum electrodes are unaffected by addition of magnetized microparticles. Magnetoelectrocatalysis is established by magnetic gradients.

Abstract Image

Abstract Image

磁电催化:氢气进化反应的证据
在电极表面建立磁梯度的地方,氢进化反应(HER)速率更高。通过比较具有可比功函数的金属的文献数据,我们注意到顺磁金属的速率比二磁性金属高 1000 倍。由于电子自旋不配对,顺磁性金属和铁磁性金属可建立界面磁梯度。在二磁性电极上,梯度是通过添加磁化微粒而诱发的。在二磁性玻璃碳电极上的 Nafion 中,磁化的 γ-Fe2O3 微颗粒的氢演化起始电压比去磁化的微颗粒低 190 mV(-18 kJ mol-1)。磁化微粒与去磁微粒的化学性质相同,磁化微粒的磁场和梯度的物理区别提高了电子转移率。对于磁化的 Fe3O4 微颗粒,起始电压低 280 mV(-27 kJ mol-1)。顺磁性铂电极不受磁化微颗粒的影响。磁电催化是通过磁梯度建立的。
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来源期刊
CiteScore
3.70
自引率
0.00%
发文量
0
期刊介绍: ACS Physical Chemistry Au is an open access journal which publishes original fundamental and applied research on all aspects of physical chemistry. The journal publishes new and original experimental computational and theoretical research of interest to physical chemists biophysical chemists chemical physicists physicists material scientists and engineers. An essential criterion for acceptance is that the manuscript provides new physical insight or develops new tools and methods of general interest. Some major topical areas include:Molecules Clusters and Aerosols; Biophysics Biomaterials Liquids and Soft Matter; Energy Materials and Catalysis
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