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RuO<sub>2</sub> nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry
송현곤 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Partially hydrous RuO<sub>2</sub> nanocluster embedded in a carbon matrix (x-RuO<sub>2</sub>@C with x = hydration degree = 0.27) is presented as a bifunctional catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for water splitting. Symmetric water electrolyzers based on 0.27-RuO<sub>2</sub>@C for both electrodes showed smaller potential gaps between HER and OER at pH 0, pH 14 and even pH 7 than conventional asymmetric electrolyzers based on two different catalysts (Pt/C || Ir/C). Moreover, 0.27-RuO<sub>2</sub>@C showed another bifunctional electroactivity for fuel cell electrochemistry involving hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) that are the backward reactions of HER and OER respectively. Pt-level HOR electroactivity was obtained from 0.27-RuO<sub>2</sub>@C, while its ORR activity was inferior to that of Pt with 200 mV higher overpotential required. The tetra-functionality of 0.27-RuO<sub>2</sub>@C showed the possibility of realizing single-catalyst regenerative fuel cells.
Hyun-Kon Song(송현곤) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Gel polymer electrolyte (GPE) is a liquid electrolyte (LE) entrapped by polymer network, which is characterized by the properties between those of liquid and solid electrolytes in terms of the ionic conductivity and the physical phase. In this talk, we focus on GPEs that are gelated in situ within cells. A mixture of LE and monomer or polymer in a liquid phase is introduced into a pre-assembled cell without electrolyte, followed by thermal gelation based on physical gelation, monomer polymerization or polymer cross-linking. Therefore, GPEs are formed omnipresent in cells, covering the pores of electrode material particles, voids between the particles, and even the pores of separators. Resultantly, different from ex situ formed GPEs, the in situ GPEs have no electrode/electrolyte contact problems. Functional GPEs are introduced as a more advanced form of GPEs, improving lithium ion transference number or capturing transition metals released from electrode materials.