UNIST · Energy
Shangguo Liu 교수의 연구실은 전기화학적 에너지 변환 기술, 특히 수소 연료전지와 수전해를 위한 고성능 촉매 개발에 집중하고 있습니다. 주로 루테늄 기반 나노구조 촉매를 설계하여 산성, 중성, 알칼리성 조건에서 모두 뛰어난 안정성과 활성도를 확보하고 있으며, 산소 발생 반응(OER)과 수소 발생 반응(HER)에 대한 pH 유연성과 금속 나노입자/단일 원자 활성 부위의 최적화를 핵심 전략으로 삼고 있습니다. 특히 산소 공여체 결함, 금속-기초 쌍, 고체 용액 산화물 등 나노구조 제어를 통해 촉매의 전기화학적 거동을 정밀하게 조절합니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The oxygen evolution reaction (OER) is a key reaction for many electrochemical devices. To date, many OER electrocatalysts function well in alkaline media, but exhibit poor performances in neutral and acidic media, especially the acidic stability. Herein, sodium-decorated amorphous/crystalline RuO<sub>2</sub> with rich oxygen vacancies (a/c-RuO<sub>2</sub> ) was developed as a pH-universal OER electrocatalyst. The a/c-RuO<sub>2</sub> shows remarkable resistance to acid corrosion and oxidation du
Synergistic optimization of the elementary steps of water dissociation and hydrogen desorption for the hydrogen evolution reaction (HER) in alkaline media is a challenge. Herein, the Ru cluster anchored on a trace P-doped defective TiO<sub>2</sub> substrate (Ru/P-TiO<sub>2</sub> ) was synthesized as an electrocatalyst for the HER; it exhibited a commercial Pt/C-like geometric activity and an excellent mass activity of 9984.3 mA mg<sub>Ru</sub> <sup>-1</sup> at -0.05 V vs. RHE, which is 34.3 and
Simultaneous optimization of the energy level of water dissociation, hydrogen and hydroxide desorption is the key to achieving fast kinetics for the alkaline hydrogen evolution reaction (HER). Herein, the well-dispersed Ru clusters on the surface of amorphous/crystalline CeO<sub>2-δ</sub> (Ru/ac-CeO<sub>2-δ</sub> ) is demonstrated to be an excellent electrocatalyst for significantly boosting the alkaline HER kinetics owing to the presence of unique oxygen vacancy (V<sub>O</sub> ) and Ru Lewis ac
Abstract The development of efficiently active and stable bifunctional noble‐metal‐based electrocatalysts toward overall water splitting is urgent and challenging. In this work, a rutile‐structured ruthenium‐zinc solid solution oxide with oxygen vacancies (Ru 0.85 Zn 0.15 O 2‐δ ) is developed by a simple molten salt method. With naturally abundant edges of ultrasmall nanoparticles clusters, Ru 0.85 Zn 0.15 O 2‐δ requires ultralow overpotentials, 190 mV for acidic oxygen evolution reaction (OER)
Ru nanoparticles (NPs) and single atoms (SAs)-based materials have been investigated as alternative electrocatalysts to Pt/C for hydrogen evolution reaction (HER). Exploring the dominant role of atomic- and nano-ruthenium as active sites in acidic and alkaline media is very necessary for optimizing the performance. Herein, an electrocatalyst containing both Ru SAs and NPs anchored on defective carbon (Ru<sub>SA+NP</sub> /DC) has been synthesized via a Ru-alginate metal-organic supramolecules con
Abstract The oxygen evolution reaction (OER) is a key reaction for many electrochemical devices. To date, many OER electrocatalysts function well in alkaline media, but exhibit poor performances in neutral and acidic media, especially the acidic stability. Herein, sodium‐decorated amorphous/crystalline RuO 2 with rich oxygen vacancies (a/c‐RuO 2 ) was developed as a pH‐universal OER electrocatalyst. The a/c‐RuO 2 shows remarkable resistance to acid corrosion and oxidation during OER, which leads
Abstract Developing highly active, durable, and cost‐effective electrocatalysts for the oxygen evolution reaction (OER) is of prime importance in proton exchange membrane (PEM) water electrolysis techniques. Herein, a surface lanthanum‐deficient (SLD) iridium oxide as a highly efficient OER electrocatalyst is reported (labeled as La 3 IrO 7 ‐SLD), which is obtained by electrochemical activation, and shows better activity and durability than that of commerically available IrO 2 as well as most of
The rational design of multi-site electrocatalysts with three different functions for facile H<sub>2</sub>O dissociation, H-H coupling, and rapid H<sub>2</sub> release is desirable but difficult to achieve. This strategy can accelerate the sluggish kinetics of the hydrogen evolution reaction (HER) under alkaline conditions. To resolve this issue, a Mo/Ru-based catalyst with three different active sites (Ru/Mo<sub>2</sub>C/MoO<sub>2</sub>) is rationally designed and its performance in alkaline HE
Even though grain boundaries (GBs) have been previously employed to increase the number of active catalytic sites or tune the binding energies of reaction intermediates for promoting electrocatalytic reactions, the effect of GBs on the tailoring of the local chemical environment on the catalyst surface has not been clarified thus far. In this study, a GBs-enriched iridium (GB-Ir) was synthesized and examined for the alkaline hydrogen evolution reaction (HER). Operando Raman spectroscopy and dens
The oxygen evolution reaction (OER) is the primary bottleneck for electrochemical splitting of water into H<sub>2</sub>. Developing robust and active OER electrocatalysts through understanding the OER mechanism is essential. However, the mechanism for OER is not yet well understood even for the most studied rutile Ru-based oxide, especially in a water-solvent environment. It is still disputed whether the adsorbate evolving mechanism (AEM) is competitive with the lattice oxygen mechanism (LOM). I
Alkaline water electrolysis represents a pivotal technology for green hydrogen production yet faces critical challenges including limited current density and high energy input. Herein, a heterostructured bimetallic nitrides supported RuNi alloy (RuNi/ZrNiN<sub>x</sub>) is developed through in situ epitaxial growth under ammonolysis, achieving exceptional bifunctional activity and durability for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 m KOH electrolyte. The RuNi
Regulating competitive reaction pathways to direct the selectivity of electrochemical CO<sub>2</sub> reduction reaction toward a desired product is crucial but remains challenging. Herein, switching product from HCOOH to CO is achieved by incorporating Sb element into the CuS, in which the Cu-S ionic bond is coupled with S-Sb covalent bond through bridging S atoms that elongates the Cu-S bond from 2.24 Å to 2.30 Å. Consequently, CuS with a shorter Cu-S bond exhibited a high selectivity for produ
Abstract Simultaneous optimization of the energy level of water dissociation, hydrogen and hydroxide desorption is the key to achieving fast kinetics for the alkaline hydrogen evolution reaction (HER). Herein, the well‐dispersed Ru clusters on the surface of amorphous/crystalline CeO 2‐δ (Ru/ac‐CeO 2‐δ ) is demonstrated to be an excellent electrocatalyst for significantly boosting the alkaline HER kinetics owing to the presence of unique oxygen vacancy (V O ) and Ru Lewis acid–base pairs (LABPs)
Abstract Synergistic optimization of the elementary steps of water dissociation and hydrogen desorption for the hydrogen evolution reaction (HER) in alkaline media is a challenge. Herein, the Ru cluster anchored on a trace P‐doped defective TiO 2 substrate (Ru/P‐TiO 2 ) was synthesized as an electrocatalyst for the HER; it exhibited a commercial Pt/C‐like geometric activity and an excellent mass activity of 9984.3 mA mg Ru −1 at −0.05 V vs. RHE, which is 34.3 and 18.7 times higher than that of P
Abstract The effect of lattice‐matched heterointerfaces on the hydrogen reverse spillover process for accelerating alkaline hydrogen evolution reaction (HER) kinetics has not yet been reported. Herein, a lattice‐matched Ru/W 2 C heterostructure is successfully constructed for effective hydrogen production. Experimental and theoretical results reveal that the Ru nanocluster can effectively stabilize W 2 C and thus promote the formation of phase‐pure W 2 C in the Ru/W 2 C heterostructure. In addit
