Results 21 to 30 of about 3,233 (162)
Rare Metals, EarlyView.ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2006 主要分析不同森林植被下有机碳的分解动态和土壤碳库各组分大小、周转时间。结果表明：土壤样品培养90天，CO2累计释放量表层大致为1723～5065mg／kg、下层大致为178～642mg／kg。分解速率总的趋势是前期快，后期慢，表层明显大于下层。大小顺序为：冷杉林〉针阔混交林和阔叶林〉针叶林。在不同植被下的表层和下层土壤中，活性碳占总有机碳的0．54％～1．67％，0．45％～5．48％．平均驻留时间为11～56天、60～88天；缓效性碳占总有机碳的23．0％～63．3％，33．2％～72．2 ...
邵月红 +3 more
doaj +2 more sources
Rare Metals, EarlyView.ABSTRACT The development of high‐performance and stable electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) plays a critical role in advancing clean energy technologies, including metal‐air batteries and hydrogen production through overall water splitting.
Chen‐Yu Cai +4 more
wiley +1 more source
Synthesis and Catalytical Performance of Novel Porous Organic Polymers [PDF]
, 2016 均相催化剂广泛应用到许多有机反应中，如氢甲酰化反应、不对称氢化反应和Suzuki偶联反应等，但因贵金属催化剂很难重复利用限制了其大规模的使用。均相催化剂固载化能很好解决这个问题。有机多孔聚合物材料因具有高的热稳定性、高的比表面积和大的孔容等优点，在非均相催化领域有很大的潜在应用价值。基于这个背景，我们合成了多种新型功能化的膦配体并以不同的方式聚合成有机多孔聚合物，催化氢甲酰化反应、不对称氢化反应和Suzuki偶联反应表现出优异的性能。 在本论文的第二章中，我们成功合成了以下四种乙烯基功能化的有机膦配体。
熊凯
core
Rare Metals, EarlyView.ABSTRACT Efficient and durable bifunctional electrocatalysts are vital for scalable water electrolysis. Here, we realize cobalt‐vacancy (Covac) engineering in CoFeP supported on N,P‐codoped carbon nanocages (Co1‐vacFeP/NPC) through a simple route comprising a CoFe Prussian blue analog precursor, phosphidation–pyrolysis, tannic‐acid etching, and a ...
Yuan‐Liang Yuan +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 为了解土壤有机碳组分在植被恢复过程中的变化规律，选取了红壤区本底条件基本一致、不同恢复年限的马尾松林为研究对象，以未治理的侵蚀裸地（CK1）和恢复后的次生林（CK2）为对照，采用物理化学分组法，将土壤有机碳分为由溶解性有机碳（DOC）和颗粒有机碳(POM)组成的活性碳库、物理保护态的团聚体与粉粒和黏粒组合成的缓效性碳库以及化学结构稳定的惰性碳库。结果表明：在植被恢复过程中（0～30年）活性碳库储量及其分配比例在植被恢复7～10年显著提高(P＜0.05)，并在植被恢复27～30年保持较稳定水平 ...
邓 翠 +6 more
doaj
活性碳上羧酸根锚定AuCl3催化乙炔氢氯化反应的理论研究 [PDF]
, 2018 采用密度泛函B3LYP方法,运用分子模型对活性碳（AC）上羧酸根负载AuClx催化剂的活性结构、稳定性以及催化乙炔氢氯化反应机制进行了详细的理论探讨。结果表明,AuCl3催化剂可以被表面羧酸根单中心级分散锚定,形成AC-COOH-AuCl3表面活性中心,进而在氢氯化过程中与乙炔发生协同加成生成氯乙烯,同时形成具有螯合结构的表面活性中心AC-CO2>AuCl2,进而催化氢氯化反应遵循分步反应异步加成机制:乙炔活化吸附到Au（Ⅲ）中心,HCl异裂亲核加成到乙炔伴随羧酸根质子化,分子内质子迁移形成Au（Ⅲ ...
吕鑫, 宁利超, 张冠如, 谭凯
core
Rare Metals, EarlyView.ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 为探明坡耕地土壤有机碳空间分布特征，对紫色土丘陵区坡耕地不同部位土壤有机碳及活性有机碳顺坡和深度分布进行分析。结果表明，坡耕地上坡土层深度仅为22.3 cm，中坡和下坡土层深度约为上坡的2.01倍和3.30倍；与上坡比较，中坡和下坡土壤容重下降了0.2和0.04，土壤孔隙度增加了19.82%与3.83%。沿坡从上向下土壤有机碳及活性有机碳储量显著增加，下坡土壤有机碳及活性有机碳储量比上坡和中坡分别增加了674.74%，104.09%和958.51%，267.75 ...
樊红柱, 张泽洪, 郭, 蒋
doaj
Overseas Chinese Environmental Engineers and Scientists Association (OCEESA) Report, Regular Issue, February 2020 [PDF]
, 2020 This OCEESA report, which is regular issue of OCEESA Journal (Overseas Chinese Environmental Engineers and Scientists Association Journal). This report is OCEESA report number: OCEESA/JL-2020/3701, February 2020, ISSN 1072 -7248.
Hung, Yung-Tse +2 more
core +1 more source