Photoelectrochemical (PEC) cells offer a promising approach for developing low-cost solar energy conversion system. However, the lack of stable and cost-effective electrodes remians a bottleneck that hampers their practical applications. Here, we propose a kind of integrated all-in-one three dimensional (3D) carbon nanowall (CNW) electrodes without sensitized semiconductors for stable all-carbon PEC cell. The all-in-one CNW electrodes were fabricated by directly growing CNW on both sides of the SiO2/Si/SiO2 wafer employing Radio Frequency Plasmon Enhance Chemical Vapor Deposition method. Benefited from the interconnected 3D textured structure, CNW can effectively absorb the incident light, and provide a large electrochemical reaction interface at CNW surface that promotes the separation of photo-generated charge carriers, which makes it a superior electrode material. Experimental results show that the all-in-one CNW electrodes possess excellent PEC performance with photocurrent density of 830 μA/cm2. Moreover, the CNW electrodes exhibit excellent photo responses over a wide waveband and superior stability with maintained photocurrent response even after 60 days, which outperforms the electrodes using the other two-dimensional layered materials or semiconductor sensitized electrodes. Such an all-in-one electrode with impressive photovoltaic properties provides a promising platform for PEC applications with high efficiency, eco-friendly, excellent stability and low cost.

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基于碳纳米壁的高稳定性一体化光电化学电极

光电化学（PEC）电池为开发低成本太阳能转换系统提供了一种很有前景的方法。然而，缺乏稳定且具有成本效益的电极仍然是阻碍其实际应用的瓶颈。在这里，我们提出了一种无敏化半导体的集成一体式三维（3D）碳纳米壁（CNW）电极，用于稳定的全碳 PEC 电池。采用射频等离子体增强化学气相沉积方法，通过在 SiO2/Si/SiO2 晶片的两侧直接生长 CNW 来制造一体式 CNW 电极。得益于互连的 3D 纹理结构，CNW 可以有效吸收入射光，并在 CNW 表面提供大的电化学反应界面，促进光生电荷载流子的分离，这使它成为一种优良的电极材料。实验结果表明，多合一的 CNW 电极具有优异的 PEC 性能，光电流密度为 830 μA/cm2。此外，CNW电极在宽波段表现出优异的光响应和优异的稳定性，即使在60天后仍能保持光电流响应，优于使用其他二维层状材料或半导体敏化电极的电极。这种具有令人印象深刻的光伏特性的一体式电极为PEC应用提供了一个具有高效率、环保、优异稳定性和低成本的有前途的平台。CNW 电极在宽波段表现出优异的光响应和优异的稳定性，即使在 60 天后仍能保持光电流响应，优于使用其他二维层状材料或半导体敏化电极的电极。这种具有令人印象深刻的光伏特性的一体式电极为PEC应用提供了一个具有高效率、环保、优异稳定性和低成本的有前途的平台。CNW 电极在宽波段表现出优异的光响应和优异的稳定性，即使在 60 天后仍能保持光电流响应，优于使用其他二维层状材料或半导体敏化电极的电极。这种具有令人印象深刻的光伏特性的一体式电极为PEC应用提供了一个具有高效率、环保、优异稳定性和低成本的有前途的平台。