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highly exposed Cu active sites as efficient peroxidase mimics for colorimetric analysis

ChemPhysMater 2024年第2期3卷 204-211页

作者： Hengya Wei Shushu Chu Fangning Liu Shengzhen Li Yizhong Lu School of Materials Science and Engineering University of JinanJinan 250022China

Nanozymes are nanomaterials with intrinsic enzyme-mimic activity,but their large-scale application is generally limited by their low catalytic ***,we demonstrated that highly exposed Cu active sites on two-dimensional(2D)nitrogen-doped carbon(Cu_(x)/NC)can serve as efficient peroxidase-like(POD)catalysts with high atomic ***,the uniformly distributed Cu active sites could react with H_(2)O_(2)to produce singlet oxygen(^(1)O_(2))under acidic conditions,which can efficiently oxidizes colorless 3,3',5,5'-tetramethylbenzidine(TMB)to blue oxidized TMB(oxTMB).Among various Cu_(x)/NC nanozymes studied,the Cuo.14/NC exhibited smaller maximum catalytic velocities(V_(max))and Menten constant(K_(m))for TMB and H_(2)O_(2).Benefiting from the highly active peroxidase-like activity,the Cu_(0.14)/NC nanozyme could be successfully applied for the hydroquinone(HQ)and ascorbic acid(AA)detection applications through the inhibitory effect of HQ and *** interestingly,α-glucosidase(α-Glu)detection sensing platform could be constructed based on HQ as a signal transmitter,with the detection range ranging from O to 12 U/L and the minimum detection limit being 0.68 U/*** work provides not only an idea for the rational design of highly exposed Cu active sites but also fabricate an effective detection sensing platform forHQ,AA,andα-Glu detection.

关键词： Nanozyme highly exposed active sites Peroxidase-like α-glucosidase Sensing

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Recycling valuable cobalt from spent lithium ion batteries for controllably designing a novel sea-urchin-like cobalt nitride-graphene hybrid catalyst: Towards efficient overall water splitting

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Journal of Energy Chemistry 2021年第11期30卷 440-450,I0010页

作者： Tingting Liu Sheng Cai Genfu Zhao Zhihui Gao Shuming Liu Huani Li Lijuan Chen Mian Li Xiaofei Yang Hong Guo School of Materials Science and Engineering Green Energy Key Laboratory of All–Solid Ion Battery in Yunnan Province UniversityYunnan UniversityKunming 650091YunnanChina National and Local Joint Engineering Laboratory for Lithium–ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina Department of Mechanical and Materials Engineering Western University1151 Richmond StLondonOntario N6A 3K7Canada

Along with the continuous consumption in lithium-ion batteries (LIBs), the price of cobalt is inevitably going up in recent years. Therefore, recycling valuable Co element from spent devices, and boosting its service efficiency are becoming two indispensable approaches to promote the utilization of Co in various energy conversion/storage devices. Herein, we realize the recovery of Co from spent LIBs and synthesize a three–dimensional (3D) sea-urchin-like cobalt nitride composite material (labeled as CoN-Gr-2), which is used as a bi-functional catalyst for water splitting. Benefiting from the intrinsic high conductivity, larger surface area and unique 3D sea–urchin–like architecture, CoN-Gr-2 shows an excellent electron transfer efficiency, highly exposed active sites as well as the superior mass transport capacity. The CoN-Gr-2 catalyst exhibits low overpotentials of 128.9 mV and 280 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are comparable to the commercial 20 wt% Pt/C and RuO_(2) catalysts. Moreover, when adopting CoN-Gr-2 as both anode and cathode materials for overall water splitting (in 1.0 M KOH electrolyte), the assembled cell achieves a current density of 10 mA cm^(−2) at 1.61 V, which almost close to that of Pt/C||RuO_(2) benchmark (1.60 V), demonstrating its superior water-splitting efficiency. Meanwhile, the CoN catalysts exhibit strong chemical interaction with the Gr support, suppressing the aggregation of CoN catalysts and maintains their high activity during HER and OER reactions. So, the cell exhibits a high current retention of 97.3% after 40 h. This work successfully develops an industrial chain from recycling Co wastes in spent energy devices to controllably designing 3D sea-urchin-like CoN-Gr with high water splitting efficiency. Therefore, it could further promote the efficient utilization of valuable Co element in various energy devices.

关键词： Recycling valuable Co element Three-dimensional(3D)sea-urchin-like CoN-Gr highly exposed active sites Water splitting

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