Homogeneous CO_(3)O_(4) film electrode with enhanced oxygen evolution electrocatalysis via surface reduction

Homogeneous NaBH_(4)-reduced Co_(O)_(4) thin film electrodes with enhanced oxygen evolution electrocatalysis were obtained via a controlled-synthesis route.Firstly CoOx colloids were synthesized via ethylene glycol solvothermal method and cast on conductive glass substrates.The oxygen evolution reaction(OER) electrocatalysis of these asprepared CO_(3)O_(4) thin films were then significantly enhanced via a simple surface reduction by NaBH_(4) solution.The OER catalytic performance of the NaBH_(4)-reduced thin films was strongly dependent on the NaBH_(4) concentration.The use of NaBH_(4)-reduced thin film electrodes for OER in alkaline solution supported higher current density and consequently negative shifts of the onset potential compared to that of the pristine.The optimal B_(12.5,20)-CO_(3)O_(4) thin films exhibited excellent OER catalytic performances:At the current density of 10 mA·cm^(-2),a low overpotential of 365 mV and a small Tafel slope of 59.0 mV·dec^(-1) were observed.In addition,these B_(12.5,20)-CO_(3)O_(4) thin film electrodes possessed good stability that can well recover its OER performance in a 24-h chronoamperometric stability test.

肝癌患者介入治疗穿刺处出血影响因素的真实世界研究

目的探讨经股动脉介入治疗肝癌患者穿刺处出血的影响因素。方法前瞻性收集2021年7月至2023年1月于我中心收治的经股动脉介入治疗肝癌患者的临床资料。采用单因素和多因素Logistic回归分析,确定肝癌患者穿刺处出血的独立风险因素。结果共纳入936例肝癌患者进行分析,其中发生穿刺处出血109例(11.6%)。单因素分析提示性别、BMI、本次手术类型、肝功能情况、门脉高压、血小板、凝血酶原时间、纤维蛋白原、鞘管留置时间、血管穿刺次数与穿刺处出血相关(P<0.1)。多因素Logistic回归分析表明女性(OR=16.421,95%CI:8.299~32.492)、BMI≥28 kg/m2(OR=3.898,95%CI:1.489~10.202)、肝硬化Child-Pugh评分5~6分(OR=3.179,95%CI:1.754~5.761)、肝硬化Child-Pugh评分≥7分(OR=8.171,95%CI:3.656~18.264)、血小板计数50~100×10^(9)/L(OR=6.228,95%CI:3.470~11.176)、血小板计数<50×10^(9)/L(OR=77.491,95%CI:16.321~367.917)、鞘管留置时间>240 min(OR=4.060,95%CI:2.012~8.193)、血管穿刺次数=2次(OR=9.422,95%CI:4.786~18.549)、血管穿刺次数>2次(OR=28.347,95%CI:12.217~65.773)是发生穿刺处出血的危险因素。术前一周使用止血相关药物(OR=0.048,95%CI:0.015~0.151)为保护因素。结论女性、肥胖、肝硬化、血小板减少、鞘管留置时间>240 min、血管反复穿刺是发生穿刺处出血的独立危险因素。其中肝硬化Child-Pugh评分越高,血小板减少越严重,发生穿刺处出血的风险越大。