研究背景 现阶段质子交换膜燃料电池（PEMFCs）发展瓶颈在于阴极氧还原反应 (ORR)的缓慢动力学导致严重依赖贵金属Pt基催化剂加速反应进程。然而Pt催化剂的高成本和低储量限制大规模应用。具有M-N4中心的M-N-C基催化剂，例如M-N4大环配合物和 M-N 掺杂碳 (M-N-C) ...

过氧化尿素(CO(NH2)2•H2O2)作为尿素的衍生物，已广泛应用于制药、农业、纺纱、日常化工等。CO(NH2)2•H2O2的工业生产主要依赖于尿素和H2O2这两种反应物。其中，通过碳源(CO2)和氮源(N2、NO、NO2−、NO3−)耦合高效电催化剂，可以在电化学条件下通过电催化C-N偶联反应有效地生成尿素。同时，利用高效电催化剂和活性OOH中间体的适当 ...

金属-氮-碳（M-N-C）单原子催化剂被认为是高效的铂基催化剂替代品。过去，单原子催化剂在不同pH环境下的活性和选择性机制存在争议。本研究通过分析超过100种M-N-C结构，成功开发了单原子催化剂的pH-电场耦合新模型。该模型揭示了氧还原反应（ORR ...

There's a major change taking place this year and it could leave some without vital access to data on their devices. The UK's 3G service is slowly being switched off in favour of faster and more ...

本研究揭示了活性氧物种(ROS)在美洲黑杨木质部发育中的关键作用。研究人员通过对比分析速生型(Wimco-109)和慢生型(Wimco-83)克隆株系发现，超氧阴离子(O2•?)促进生长而H2O2导致木质化增强。研究证实NADPH氧化酶(NOX)活性差异调控ROS平衡，为造纸工业选育低木质素 ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

目前 H2O2合成面临挑战，且传统芬顿反应存在弊端。研究人员构建双单原子位点的 CoNiSA/OCF 用于 pH 通用型 H2O2生产及污染物降解。该研究实现高效 H2O2合成及污染物降解，意义重大。 在当今的科技发展中，过氧化氢（H 2 O 2 ）作为一种用途广泛且环境友好的氧化剂 ...

We may receive a commission on purchases made from links. Modern cars are designed to be more efficient and eco-friendly than ever. Automakers build vehicles with a wealth of advanced features to not ...

Don't let failing oxygen sensors compromise your engine's performance. O2 sensors are critical to emissions control on your car, SUV or truck. As the name implies, the O2 sensor (also called an ...

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The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...