Kang Jin Soo, Kim Jin, Lee Myeong Jae, Son Yoon Jun, Chung Dong Young, Park Subin, Jeong Juwon, Yoo Ji Mun, Shin Heejong, Choe Heeman, Park Hyun S, Sung Yung-Eun
Center for Nanoparticle ResearchInstitute for Basic Science Seoul 08826 Republic of Korea.
School of Chemical and Biological Engineering Seoul National University Seoul 08826 Republic of Korea.
Adv Sci (Weinh). 2017 Dec 19;5(1):1700601. doi: 10.1002/advs.201700601. eCollection 2018 Jan.
Demands for sustainable production of hydrogen are rapidly increasing because of environmental considerations for fossil fuel consumption and development of fuel cell technologies. Thus, the development of high-performance and economical catalysts has been extensively investigated. In this study, a nanoporous Mo carbide electrode is prepared using a top-down electrochemical process and it is applied as an electrocatalyst for the hydrogen evolution reaction (HER). Anodic oxidation of Mo foil followed by heat treatment in a carbon monoxide (CO) atmosphere forms a nanostructured Mo carbide with excellent interconnections, and these structural characteristics lead to high activity and durability when applied to the HER. Additionally, characteristic behavior of Mo is observed; metallic Mo nanosheets form during electrochemical anodization by exfoliation along the (110) planes. These nanosheets are viable for chemical modification, indicating their feasibility in various applications. Moreover, the role of carbon shells is investigated on the surface of the electrocatalysts, whereby it is suggested that carbon shells serve as a mechanical barrier against the oxidative degradation of catalysts that accompanies unavoidable volume expansion.
由于对化石燃料消耗的环境考量以及燃料电池技术的发展，对可持续制氢的需求正在迅速增加。因此，高性能且经济的催化剂的开发已得到广泛研究。在本研究中，采用自上而下的电化学工艺制备了一种纳米多孔碳化钼电极，并将其用作析氢反应（HER）的电催化剂。钼箔的阳极氧化，随后在一氧化碳（CO）气氛中进行热处理，形成了具有优异互连性的纳米结构碳化钼，并且这些结构特性在应用于HER时导致高活性和耐久性。此外，观察到钼的特征行为；在电化学阳极氧化过程中，金属钼纳米片沿着（110）面通过剥离形成。这些纳米片可用于化学修饰，表明它们在各种应用中的可行性。此外，研究了碳壳在电催化剂表面上的作用，据此提出碳壳作为一种机械屏障，可防止伴随不可避免的体积膨胀的催化剂氧化降解。
