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P-Type Cobalt Phosphide Composites (CoP–Co2P) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H2 Evolution Activity
Langmuir ( IF 3.7 ) Pub Date : 2021-03-11 , DOI: 10.1021/acs.langmuir.0c03362 Rong Liang 1 , Yanwen Wang 1 , Chao Qin 1 , Xuehua Chen 1 , Zhizhen Ye 1 , Liping Zhu 1
Langmuir ( IF 3.7 ) Pub Date : 2021-03-11 , DOI: 10.1021/acs.langmuir.0c03362 Rong Liang 1 , Yanwen Wang 1 , Chao Qin 1 , Xuehua Chen 1 , Zhizhen Ye 1 , Liping Zhu 1
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Nowadays, transition-metal phosphides have been reported to function well in photocatalytic water splitting and possess great potential to substitute traditional noble-metal cocatalysts in the future. Herein, p-type cobalt phosphide (CoP–Co2P) nanomaterials were synthesized by phosphating the solvothermally prepared Co(OH)2 nanoflowers at a low temperature (300 °C). Then, we combined the phosphides with commercial TiO2 through facile mechanical mixing to fabricate a useful noble-metal-free photocatalyst. The phosphating time that had an influence on the composition of phosphides was tuned, and 3 h was an ideal condition after comparison. The cobalt phosphide-modified TiO2 at the optimal weight percentage (nominal 0.5%) exhibited the highest photocatalytic hydrogen rate of approximately 824.5 μmol g–1 h–1 under simulated sunlight irradiation, which was nearly equal to 160 times that of bare TiO2 and 1.7 times that of single CoP-modified TiO2. The CoPx/TiO2 heterojunction interfaces were studied using photoluminescence (PL), time-resolved PL, and photoelectrochemical methods, which revealed that the effective charge separation and transfer accelerated by the built-in electric field of p–n junction contributed significantly to the photocatalytic performance.
中文翻译：
氧化钛上修饰的P型磷化钴复合材料（CoP–Co 2 P）增强了无贵金属的光催化H 2的析出活性
如今，据报道过渡金属磷化物在光催化水分解中起良好作用，并且在将来具有替代传统贵金属助催化剂的巨大潜力。在此，通过在低温（300°C）下对溶剂热制备的Co（OH）2纳米花进行磷化处理，合成了p型磷化钴（CoP–Co 2 P）纳米材料。然后，我们通过简便的机械混合将磷化物与市售TiO 2结合，以制备有用的无贵金属光催化剂。调整了影响磷化物组成的磷化时间，比较后3 h为理想条件。磷化钴改性的TiO 2在最佳重量百分比（标称值为0.5％）下，在模拟的阳光照射下显示出最高的光催化氢速率，约为824.5μmolg –1 h –1，几乎等于裸TiO 2的160倍和单CoP的1.7倍。改性的TiO 2。使用光致发光（PL），时间分辨的PL和光电化学方法对CoP x / TiO 2异质结界面进行了研究，结果表明，p-n结的内置电场加速了有效电荷的分离和转移，对光催化性能。
更新日期：2021-03-23
中文翻译：
氧化钛上修饰的P型磷化钴复合材料（CoP–Co 2 P）增强了无贵金属的光催化H 2的析出活性
如今，据报道过渡金属磷化物在光催化水分解中起良好作用，并且在将来具有替代传统贵金属助催化剂的巨大潜力。在此，通过在低温（300°C）下对溶剂热制备的Co（OH）2纳米花进行磷化处理，合成了p型磷化钴（CoP–Co 2 P）纳米材料。然后，我们通过简便的机械混合将磷化物与市售TiO 2结合，以制备有用的无贵金属光催化剂。调整了影响磷化物组成的磷化时间，比较后3 h为理想条件。磷化钴改性的TiO 2在最佳重量百分比（标称值为0.5％）下，在模拟的阳光照射下显示出最高的光催化氢速率，约为824.5μmolg –1 h –1，几乎等于裸TiO 2的160倍和单CoP的1.7倍。改性的TiO 2。使用光致发光（PL），时间分辨的PL和光电化学方法对CoP x / TiO 2异质结界面进行了研究，结果表明，p-n结的内置电场加速了有效电荷的分离和转移，对光催化性能。
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