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In situ hydrothermal oxidation of Ternary FeCoNi Alloy Electrode for Overall Water Splitting

Energy & Environmental Materials 2024年第2期7卷 165-174页

作者： Yuwei Chen Lixia Yang Chao Li Yuqiu Wu Xiao Lν Hairen Wang Jun'e Qu Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer Materials School of Materials Science and Engineering Hubei University Faculty of Material science and Chemistry China University of Geosciences

Exploring noble metal-free catalyst materials for high efficient electrochemical water splitting to produce hydrogen is strongly desired for renewable energy *** this article,a novel bifunctional catalytic electrode of insitu-grown type for alkaline water splitting based on FeCoNi alloy substrate has been successfully prepared via a facile one-step hydrothermal oxidation route in an alkaline hydrogen peroxide *** shows that the matrix alloy with the atom ratio 4:3:3 of Fe:Co:Ni can obtain the best catalytic performance when hydrothermally treated at 180℃ for18 h in the solution containing 1.8 M hydrogen peroxide and 3.6 M sodium *** as-prepared Fe0.4Co0.3Ni0.3-1.8 electrode exhibits small overpotentials of only 184 and 175 mV at electrolysis current density of10 mA cm-2for alkaline OER and HER processes,*** overall water splitting at electrolysis current density of 10 mA cm-2can be stably delivered at a low cell voltage of 1.62 *** characteristics including the large specific surface area,the high surface nickel content,the abundant catalyst species,the balanced distribution between bivalent and trivalent metal ions,and the strong binding of in-situ naturally growed catalytic layer to matrix are responsible for the prominent catalytic performance of the Fe0.4Co0.3Ni0.3-1.8 electrode,which can act as a possible replacement for expensive noble metal-based materials.

关键词： alkaline water electrolysis bifunctional electrocatalyst FeCoNi alloy hydrothermal oxidation in-situ growing

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Resource Recovery of WC-Co Cermet using hydrothermal oxidation Technique

Resource Recovery of WC-Co Cermet using Hydrothermal Oxidati...

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The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（2）

作者： Fumihito Inagaki Ryo Sasai Hideaki Itoh Koji Watari EcoTopia Science Institute Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan EcoTopia Science Institute Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan EcoTopia Science Institute Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Advanced Manufacturing Research Institute National Institute of Advanced Industrial Science and Technology 2266-98 AnagahoraShimoshidami Moriyama-ku Nagoya 463-8560 Japan

＜正＞ WC-Co cermet is widely used in industrial applications such as cutting tools, dies, wear parts and so on. It is of great importance to establish the recycling process for the precious metal resources contained in WC-Co cermet, because all these metals used in Japan are imported. In this paper we reported a hydrothermal oxidation technique using nitric acid for the reclamation of WC and Co. The WC-Co cermet specimens with various WC particle sizes and Co contents were hydrothermally treated in HNO3 aqueous solutions at temperatures of 110-200℃for durations of 6-240 h. The Co was preferentially leached out into the acidic solution, while the WC was oxidized to insoluble WO3 hydrate which was subsequently separated by filtration. The hydrothermal treatment parameters such as solvent concentrations, treatment temperatures, holding time were optimized in respect to different kinds of WC-Co cermets. A hydrothermal oxidation treatment in 3M HNO3 aqueous solution at 150℃for 24 h was capable of fully disintegrating the cermet chip composed of coarse WC grains of 1-5 μm in size with 20 wt% of Co as binder. While the more oxidation resistant specimen composed of fine WC grains of 0.5-1.0 urn in size with 13 wt% of Co, was completely disintegrated by a treatment in 7 M HNO3 aqueous solution at 170℃for 24 h. The filtered solid residues were composed of fine WO3.0.33H2O powder and a small amount of WO3. The recovered WO3.0.33H2O powder can be easily returned to the industrial process for the synthesis of WC powder so that the overall recycling cost can be possibly lowered.

关键词： WC-Co cermet Precious metal hydrothermal oxidation Material recycling

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