Woo Seongwon, Lee Jooyoung, Lee Dong Sub, Kim Jung Kyu, Lim And Byungkwon
School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), 16419 Suwon, Korea.
School of Chemical Engineering, Sungkyunkwan University (SKKU), 16419 Suwon, Korea.
Materials (Basel). 2020 Feb 13;13(4):856. doi: 10.3390/ma13040856.
In this study, simple electrospinning combined with pyrolysis were used to fabricate transition-metal-based-nanoparticle-incorporated carbon nanofiber (CNF) electrocatalysts for a high-efficiency hydrogen evolution reaction (HER) and overall water splitting. Co-CeO nanoparticle-incorporated carbon nanofibers (Co-CeO@CNF) exhibit an outstanding electrocatalytic HER performance with an overpotential and Tafel slope of 92 mV and 54 mV/dec, respectively. For the counterpart, electrolysis, we incorporate the widely used NiFe catalyst with a high oxygen evolution reaction (OER) activity into the carbon nanofiber (NiFe@CNF). To evaluate their electrochemical properties for the overall water splitting, Co-CeO@CNF and NiFe@CNF were used as the HER and OER electrocatalysts in an alkaline electrolyzer. With the paired Co-CeO@CNF and NiFe@CNF electrodes, an overall water splitting current density of 10 mA/cm was achieved by applying 1.587 V across the electrodes with a remarkably lower overpotential of 257 mV compared to that of an electrolyzer comprised of Pt/C and IrO electrodes (400 mV). Owing to the conformal incorporation of nanoparticles into the CNF, the electrocatalysts exhibit significant long-term durability over 70 h of overall water splitting. This study provides rational designs of catalysts with high electrochemical catalytic activity and durability to achieve overall water splitting.
在本研究中，采用简单的静电纺丝结合热解方法制备了负载过渡金属基纳米颗粒的碳纳米纤维（CNF）电催化剂，用于高效析氢反应（HER）和全水解。负载Co-CeO纳米颗粒的碳纳米纤维（Co-CeO@CNF）表现出优异的HER电催化性能，过电位和塔菲尔斜率分别为92 mV和54 mV/dec。对于另一个电极，即电解电极，我们将具有高析氧反应（OER）活性的广泛使用的NiFe催化剂引入碳纳米纤维（NiFe@CNF）中。为了评估它们在全水解中的电化学性能，将Co-CeO@CNF和NiFe@CNF用作碱性电解槽中的HER和OER电催化剂。使用配对的Co-CeO@CNF和NiFe@CNF电极，通过在电极两端施加1.587 V电压，实现了10 mA/cm²的全水解电流密度，与由Pt/C和IrO₂电极组成的电解槽（400 mV）相比，过电位显著降低至257 mV。由于纳米颗粒与CNF的共形结合，电催化剂在70小时的全水解过程中表现出显著的长期耐久性。本研究为实现全水解提供了具有高电化学催化活性和耐久性的催化剂的合理设计。
